Severe Storms

SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0204 AM CDT Sat Aug 16 2025 Valid 171200Z - 181200Z ...Synopsis... Across the US, broad ridging is forecast to expand while troughing consolidates over the West. As height aloft build, very warm surface temperatures are expected over parts of the southern and Southwestern CONUS. A belt of stronger flow aloft will impinge on the northern Rockies as the trough and a weak surface cold front approach. Monsoon moisture should support dry thunderstorms, while light winds and dry conditions will persist elsewhere Sunday. ...Northern Rockies Dry Thunder... Troughing should continue to intensify as it moves into the Great Basin and Rockies Sunday, as a cold front moves in from the west. This will allow for additional monsoon moisture to filter northward, supporting scattered showers and thunderstorms through the afternoon. Despite PWATs climbing to near 0.8 to 1 inches, a mix of wet and dry thunderstorms is expected ahead of the front from northern CA into the Northern Rockies. While not as dry as previous days, stronger flow aloft is expected ahead of the deepening trough. This should allow for a favorable alignment of drier/more receptive fuels and faster northeast thunderstorm motions to limit rainfall across northern NV into central ID and western MT. Thus, isolated dry lightning and ignitions are likely to remain a concern across the receptive fuels beds of the northern Great Basin and Rockies Sunday. ...Southern NV into southwest UT South of the western US troughing and stronger flow aloft, another day of dry and locally breezy conditions is expected over parts of the southern Great Basin. While displaced from the stronger flow, localized 15 mph surface winds and low RH below 15% are likely across southern NV and southwest UT. With area fuels very dry and receptive, some locally elevated fire-weather conditions are possible, though widespread occurrence is unlikely owing to the modest winds. ..Lyons.. 08/16/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0204 AM CDT Sat Aug 16 2025 Valid 171200Z - 181200Z ...Synopsis... Across the US, broad ridging is forecast to expand while troughing consolidates over the West. As height aloft build, very warm surface temperatures are expected over parts of the southern and Southwestern CONUS. A belt of stronger flow aloft will impinge on the northern Rockies as the trough and a weak surface cold front approach. Monsoon moisture should support dry thunderstorms, while light winds and dry conditions will persist elsewhere Sunday. ...Northern Rockies Dry Thunder... Troughing should continue to intensify as it moves into the Great Basin and Rockies Sunday, as a cold front moves in from the west. This will allow for additional monsoon moisture to filter northward, supporting scattered showers and thunderstorms through the afternoon. Despite PWATs climbing to near 0.8 to 1 inches, a mix of wet and dry thunderstorms is expected ahead of the front from northern CA into the Northern Rockies. While not as dry as previous days, stronger flow aloft is expected ahead of the deepening trough. This should allow for a favorable alignment of drier/more receptive fuels and faster northeast thunderstorm motions to limit rainfall across northern NV into central ID and western MT. Thus, isolated dry lightning and ignitions are likely to remain a concern across the receptive fuels beds of the northern Great Basin and Rockies Sunday. ...Southern NV into southwest UT South of the western US troughing and stronger flow aloft, another day of dry and locally breezy conditions is expected over parts of the southern Great Basin. While displaced from the stronger flow, localized 15 mph surface winds and low RH below 15% are likely across southern NV and southwest UT. With area fuels very dry and receptive, some locally elevated fire-weather conditions are possible, though widespread occurrence is unlikely owing to the modest winds. ..Lyons.. 08/16/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0204 AM CDT Sat Aug 16 2025 Valid 171200Z - 181200Z ...Synopsis... Across the US, broad ridging is forecast to expand while troughing consolidates over the West. As height aloft build, very warm surface temperatures are expected over parts of the southern and Southwestern CONUS. A belt of stronger flow aloft will impinge on the northern Rockies as the trough and a weak surface cold front approach. Monsoon moisture should support dry thunderstorms, while light winds and dry conditions will persist elsewhere Sunday. ...Northern Rockies Dry Thunder... Troughing should continue to intensify as it moves into the Great Basin and Rockies Sunday, as a cold front moves in from the west. This will allow for additional monsoon moisture to filter northward, supporting scattered showers and thunderstorms through the afternoon. Despite PWATs climbing to near 0.8 to 1 inches, a mix of wet and dry thunderstorms is expected ahead of the front from northern CA into the Northern Rockies. While not as dry as previous days, stronger flow aloft is expected ahead of the deepening trough. This should allow for a favorable alignment of drier/more receptive fuels and faster northeast thunderstorm motions to limit rainfall across northern NV into central ID and western MT. Thus, isolated dry lightning and ignitions are likely to remain a concern across the receptive fuels beds of the northern Great Basin and Rockies Sunday. ...Southern NV into southwest UT South of the western US troughing and stronger flow aloft, another day of dry and locally breezy conditions is expected over parts of the southern Great Basin. While displaced from the stronger flow, localized 15 mph surface winds and low RH below 15% are likely across southern NV and southwest UT. With area fuels very dry and receptive, some locally elevated fire-weather conditions are possible, though widespread occurrence is unlikely owing to the modest winds. ..Lyons.. 08/16/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0204 AM CDT Sat Aug 16 2025 Valid 171200Z - 181200Z ...Synopsis... Across the US, broad ridging is forecast to expand while troughing consolidates over the West. As height aloft build, very warm surface temperatures are expected over parts of the southern and Southwestern CONUS. A belt of stronger flow aloft will impinge on the northern Rockies as the trough and a weak surface cold front approach. Monsoon moisture should support dry thunderstorms, while light winds and dry conditions will persist elsewhere Sunday. ...Northern Rockies Dry Thunder... Troughing should continue to intensify as it moves into the Great Basin and Rockies Sunday, as a cold front moves in from the west. This will allow for additional monsoon moisture to filter northward, supporting scattered showers and thunderstorms through the afternoon. Despite PWATs climbing to near 0.8 to 1 inches, a mix of wet and dry thunderstorms is expected ahead of the front from northern CA into the Northern Rockies. While not as dry as previous days, stronger flow aloft is expected ahead of the deepening trough. This should allow for a favorable alignment of drier/more receptive fuels and faster northeast thunderstorm motions to limit rainfall across northern NV into central ID and western MT. Thus, isolated dry lightning and ignitions are likely to remain a concern across the receptive fuels beds of the northern Great Basin and Rockies Sunday. ...Southern NV into southwest UT South of the western US troughing and stronger flow aloft, another day of dry and locally breezy conditions is expected over parts of the southern Great Basin. While displaced from the stronger flow, localized 15 mph surface winds and low RH below 15% are likely across southern NV and southwest UT. With area fuels very dry and receptive, some locally elevated fire-weather conditions are possible, though widespread occurrence is unlikely owing to the modest winds. ..Lyons.. 08/16/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0204 AM CDT Sat Aug 16 2025 Valid 171200Z - 181200Z ...Synopsis... Across the US, broad ridging is forecast to expand while troughing consolidates over the West. As height aloft build, very warm surface temperatures are expected over parts of the southern and Southwestern CONUS. A belt of stronger flow aloft will impinge on the northern Rockies as the trough and a weak surface cold front approach. Monsoon moisture should support dry thunderstorms, while light winds and dry conditions will persist elsewhere Sunday. ...Northern Rockies Dry Thunder... Troughing should continue to intensify as it moves into the Great Basin and Rockies Sunday, as a cold front moves in from the west. This will allow for additional monsoon moisture to filter northward, supporting scattered showers and thunderstorms through the afternoon. Despite PWATs climbing to near 0.8 to 1 inches, a mix of wet and dry thunderstorms is expected ahead of the front from northern CA into the Northern Rockies. While not as dry as previous days, stronger flow aloft is expected ahead of the deepening trough. This should allow for a favorable alignment of drier/more receptive fuels and faster northeast thunderstorm motions to limit rainfall across northern NV into central ID and western MT. Thus, isolated dry lightning and ignitions are likely to remain a concern across the receptive fuels beds of the northern Great Basin and Rockies Sunday. ...Southern NV into southwest UT South of the western US troughing and stronger flow aloft, another day of dry and locally breezy conditions is expected over parts of the southern Great Basin. While displaced from the stronger flow, localized 15 mph surface winds and low RH below 15% are likely across southern NV and southwest UT. With area fuels very dry and receptive, some locally elevated fire-weather conditions are possible, though widespread occurrence is unlikely owing to the modest winds. ..Lyons.. 08/16/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0204 AM CDT Sat Aug 16 2025 Valid 171200Z - 181200Z ...Synopsis... Across the US, broad ridging is forecast to expand while troughing consolidates over the West. As height aloft build, very warm surface temperatures are expected over parts of the southern and Southwestern CONUS. A belt of stronger flow aloft will impinge on the northern Rockies as the trough and a weak surface cold front approach. Monsoon moisture should support dry thunderstorms, while light winds and dry conditions will persist elsewhere Sunday. ...Northern Rockies Dry Thunder... Troughing should continue to intensify as it moves into the Great Basin and Rockies Sunday, as a cold front moves in from the west. This will allow for additional monsoon moisture to filter northward, supporting scattered showers and thunderstorms through the afternoon. Despite PWATs climbing to near 0.8 to 1 inches, a mix of wet and dry thunderstorms is expected ahead of the front from northern CA into the Northern Rockies. While not as dry as previous days, stronger flow aloft is expected ahead of the deepening trough. This should allow for a favorable alignment of drier/more receptive fuels and faster northeast thunderstorm motions to limit rainfall across northern NV into central ID and western MT. Thus, isolated dry lightning and ignitions are likely to remain a concern across the receptive fuels beds of the northern Great Basin and Rockies Sunday. ...Southern NV into southwest UT South of the western US troughing and stronger flow aloft, another day of dry and locally breezy conditions is expected over parts of the southern Great Basin. While displaced from the stronger flow, localized 15 mph surface winds and low RH below 15% are likely across southern NV and southwest UT. With area fuels very dry and receptive, some locally elevated fire-weather conditions are possible, though widespread occurrence is unlikely owing to the modest winds. ..Lyons.. 08/16/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0204 AM CDT Sat Aug 16 2025 Valid 171200Z - 181200Z ...Synopsis... Across the US, broad ridging is forecast to expand while troughing consolidates over the West. As height aloft build, very warm surface temperatures are expected over parts of the southern and Southwestern CONUS. A belt of stronger flow aloft will impinge on the northern Rockies as the trough and a weak surface cold front approach. Monsoon moisture should support dry thunderstorms, while light winds and dry conditions will persist elsewhere Sunday. ...Northern Rockies Dry Thunder... Troughing should continue to intensify as it moves into the Great Basin and Rockies Sunday, as a cold front moves in from the west. This will allow for additional monsoon moisture to filter northward, supporting scattered showers and thunderstorms through the afternoon. Despite PWATs climbing to near 0.8 to 1 inches, a mix of wet and dry thunderstorms is expected ahead of the front from northern CA into the Northern Rockies. While not as dry as previous days, stronger flow aloft is expected ahead of the deepening trough. This should allow for a favorable alignment of drier/more receptive fuels and faster northeast thunderstorm motions to limit rainfall across northern NV into central ID and western MT. Thus, isolated dry lightning and ignitions are likely to remain a concern across the receptive fuels beds of the northern Great Basin and Rockies Sunday. ...Southern NV into southwest UT South of the western US troughing and stronger flow aloft, another day of dry and locally breezy conditions is expected over parts of the southern Great Basin. While displaced from the stronger flow, localized 15 mph surface winds and low RH below 15% are likely across southern NV and southwest UT. With area fuels very dry and receptive, some locally elevated fire-weather conditions are possible, though widespread occurrence is unlikely owing to the modest winds. ..Lyons.. 08/16/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0204 AM CDT Sat Aug 16 2025 Valid 171200Z - 181200Z ...Synopsis... Across the US, broad ridging is forecast to expand while troughing consolidates over the West. As height aloft build, very warm surface temperatures are expected over parts of the southern and Southwestern CONUS. A belt of stronger flow aloft will impinge on the northern Rockies as the trough and a weak surface cold front approach. Monsoon moisture should support dry thunderstorms, while light winds and dry conditions will persist elsewhere Sunday. ...Northern Rockies Dry Thunder... Troughing should continue to intensify as it moves into the Great Basin and Rockies Sunday, as a cold front moves in from the west. This will allow for additional monsoon moisture to filter northward, supporting scattered showers and thunderstorms through the afternoon. Despite PWATs climbing to near 0.8 to 1 inches, a mix of wet and dry thunderstorms is expected ahead of the front from northern CA into the Northern Rockies. While not as dry as previous days, stronger flow aloft is expected ahead of the deepening trough. This should allow for a favorable alignment of drier/more receptive fuels and faster northeast thunderstorm motions to limit rainfall across northern NV into central ID and western MT. Thus, isolated dry lightning and ignitions are likely to remain a concern across the receptive fuels beds of the northern Great Basin and Rockies Sunday. ...Southern NV into southwest UT South of the western US troughing and stronger flow aloft, another day of dry and locally breezy conditions is expected over parts of the southern Great Basin. While displaced from the stronger flow, localized 15 mph surface winds and low RH below 15% are likely across southern NV and southwest UT. With area fuels very dry and receptive, some locally elevated fire-weather conditions are possible, though widespread occurrence is unlikely owing to the modest winds. ..Lyons.. 08/16/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0204 AM CDT Sat Aug 16 2025 Valid 171200Z - 181200Z ...Synopsis... Across the US, broad ridging is forecast to expand while troughing consolidates over the West. As height aloft build, very warm surface temperatures are expected over parts of the southern and Southwestern CONUS. A belt of stronger flow aloft will impinge on the northern Rockies as the trough and a weak surface cold front approach. Monsoon moisture should support dry thunderstorms, while light winds and dry conditions will persist elsewhere Sunday. ...Northern Rockies Dry Thunder... Troughing should continue to intensify as it moves into the Great Basin and Rockies Sunday, as a cold front moves in from the west. This will allow for additional monsoon moisture to filter northward, supporting scattered showers and thunderstorms through the afternoon. Despite PWATs climbing to near 0.8 to 1 inches, a mix of wet and dry thunderstorms is expected ahead of the front from northern CA into the Northern Rockies. While not as dry as previous days, stronger flow aloft is expected ahead of the deepening trough. This should allow for a favorable alignment of drier/more receptive fuels and faster northeast thunderstorm motions to limit rainfall across northern NV into central ID and western MT. Thus, isolated dry lightning and ignitions are likely to remain a concern across the receptive fuels beds of the northern Great Basin and Rockies Sunday. ...Southern NV into southwest UT South of the western US troughing and stronger flow aloft, another day of dry and locally breezy conditions is expected over parts of the southern Great Basin. While displaced from the stronger flow, localized 15 mph surface winds and low RH below 15% are likely across southern NV and southwest UT. With area fuels very dry and receptive, some locally elevated fire-weather conditions are possible, though widespread occurrence is unlikely owing to the modest winds. ..Lyons.. 08/16/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0204 AM CDT Sat Aug 16 2025 Valid 171200Z - 181200Z ...Synopsis... Across the US, broad ridging is forecast to expand while troughing consolidates over the West. As height aloft build, very warm surface temperatures are expected over parts of the southern and Southwestern CONUS. A belt of stronger flow aloft will impinge on the northern Rockies as the trough and a weak surface cold front approach. Monsoon moisture should support dry thunderstorms, while light winds and dry conditions will persist elsewhere Sunday. ...Northern Rockies Dry Thunder... Troughing should continue to intensify as it moves into the Great Basin and Rockies Sunday, as a cold front moves in from the west. This will allow for additional monsoon moisture to filter northward, supporting scattered showers and thunderstorms through the afternoon. Despite PWATs climbing to near 0.8 to 1 inches, a mix of wet and dry thunderstorms is expected ahead of the front from northern CA into the Northern Rockies. While not as dry as previous days, stronger flow aloft is expected ahead of the deepening trough. This should allow for a favorable alignment of drier/more receptive fuels and faster northeast thunderstorm motions to limit rainfall across northern NV into central ID and western MT. Thus, isolated dry lightning and ignitions are likely to remain a concern across the receptive fuels beds of the northern Great Basin and Rockies Sunday. ...Southern NV into southwest UT South of the western US troughing and stronger flow aloft, another day of dry and locally breezy conditions is expected over parts of the southern Great Basin. While displaced from the stronger flow, localized 15 mph surface winds and low RH below 15% are likely across southern NV and southwest UT. With area fuels very dry and receptive, some locally elevated fire-weather conditions are possible, though widespread occurrence is unlikely owing to the modest winds. ..Lyons.. 08/16/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0204 AM CDT Sat Aug 16 2025 Valid 171200Z - 181200Z ...Synopsis... Across the US, broad ridging is forecast to expand while troughing consolidates over the West. As height aloft build, very warm surface temperatures are expected over parts of the southern and Southwestern CONUS. A belt of stronger flow aloft will impinge on the northern Rockies as the trough and a weak surface cold front approach. Monsoon moisture should support dry thunderstorms, while light winds and dry conditions will persist elsewhere Sunday. ...Northern Rockies Dry Thunder... Troughing should continue to intensify as it moves into the Great Basin and Rockies Sunday, as a cold front moves in from the west. This will allow for additional monsoon moisture to filter northward, supporting scattered showers and thunderstorms through the afternoon. Despite PWATs climbing to near 0.8 to 1 inches, a mix of wet and dry thunderstorms is expected ahead of the front from northern CA into the Northern Rockies. While not as dry as previous days, stronger flow aloft is expected ahead of the deepening trough. This should allow for a favorable alignment of drier/more receptive fuels and faster northeast thunderstorm motions to limit rainfall across northern NV into central ID and western MT. Thus, isolated dry lightning and ignitions are likely to remain a concern across the receptive fuels beds of the northern Great Basin and Rockies Sunday. ...Southern NV into southwest UT South of the western US troughing and stronger flow aloft, another day of dry and locally breezy conditions is expected over parts of the southern Great Basin. While displaced from the stronger flow, localized 15 mph surface winds and low RH below 15% are likely across southern NV and southwest UT. With area fuels very dry and receptive, some locally elevated fire-weather conditions are possible, though widespread occurrence is unlikely owing to the modest winds. ..Lyons.. 08/16/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0204 AM CDT Sat Aug 16 2025 Valid 171200Z - 181200Z ...Synopsis... Across the US, broad ridging is forecast to expand while troughing consolidates over the West. As height aloft build, very warm surface temperatures are expected over parts of the southern and Southwestern CONUS. A belt of stronger flow aloft will impinge on the northern Rockies as the trough and a weak surface cold front approach. Monsoon moisture should support dry thunderstorms, while light winds and dry conditions will persist elsewhere Sunday. ...Northern Rockies Dry Thunder... Troughing should continue to intensify as it moves into the Great Basin and Rockies Sunday, as a cold front moves in from the west. This will allow for additional monsoon moisture to filter northward, supporting scattered showers and thunderstorms through the afternoon. Despite PWATs climbing to near 0.8 to 1 inches, a mix of wet and dry thunderstorms is expected ahead of the front from northern CA into the Northern Rockies. While not as dry as previous days, stronger flow aloft is expected ahead of the deepening trough. This should allow for a favorable alignment of drier/more receptive fuels and faster northeast thunderstorm motions to limit rainfall across northern NV into central ID and western MT. Thus, isolated dry lightning and ignitions are likely to remain a concern across the receptive fuels beds of the northern Great Basin and Rockies Sunday. ...Southern NV into southwest UT South of the western US troughing and stronger flow aloft, another day of dry and locally breezy conditions is expected over parts of the southern Great Basin. While displaced from the stronger flow, localized 15 mph surface winds and low RH below 15% are likely across southern NV and southwest UT. With area fuels very dry and receptive, some locally elevated fire-weather conditions are possible, though widespread occurrence is unlikely owing to the modest winds. ..Lyons.. 08/16/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0202 AM CDT Sat Aug 16 2025 Valid 161200Z - 171200Z ...Synopsis... A broad mid-level trough over the Northwestern US is forecast to consolidate and intensify today/tonight as it impinges on the northwestern edge of a ridge of high pressure over the central US. The tightening height gradient will bolster flow aloft, while at the same time, a surface cold front will move in from the Northwest. Monsoon moisture will support showers and thunderstorms along/ahead of the front, while localized dry and breezy conditions are possible over the Southwestern US. ...Northwest and Rockies Dry Thunder... Across the Northwest and central Rockies, persistent monsoon moisture will be in palace ahead of the upper trough and attendant cold front. Increasing PWATs (0.8-1 inch) will favor a mix of wet and dry storms across far northern CA into eastern OR and ID/MT from the afternoon into the evening hours. While the air mass in the low-levels will not be as dry as recent days, with increasing RH ahead of the front, 30-40 kt of mid-level flow should support faster northeastward storm motions of 25-30 kt. This will allow for less wetting rainfall as storms track eastward over areas of very receptive fuels supportive of lightning ignitions. Additionally, gusty outflow winds are expected, potentially impacting existing active fires across the area. The risk for lightning may continue overnight as the upper trough and front shift eastward towards ID and MT. IsoDryT highlights will remain, and have been expanded over areas of the expected driest fuels and storms. ...Southern Great Basin... As the mid-level trough continues eastward across the Northwest, southwesterly flow aloft should continue to promote locally breezy and dry conditions across portions of southern NV and western UT. South-southwest winds of up to 15 mph, along with daytime relative humidity as low as 15%, are expected in some valleys in the southern Great Basin. Amidst dry fuels, some locally elevated fire-weather conditions are possible. The lack of stronger winds for now precludes elevated highlights. ..Lyons.. 08/16/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0202 AM CDT Sat Aug 16 2025 Valid 161200Z - 171200Z ...Synopsis... A broad mid-level trough over the Northwestern US is forecast to consolidate and intensify today/tonight as it impinges on the northwestern edge of a ridge of high pressure over the central US. The tightening height gradient will bolster flow aloft, while at the same time, a surface cold front will move in from the Northwest. Monsoon moisture will support showers and thunderstorms along/ahead of the front, while localized dry and breezy conditions are possible over the Southwestern US. ...Northwest and Rockies Dry Thunder... Across the Northwest and central Rockies, persistent monsoon moisture will be in palace ahead of the upper trough and attendant cold front. Increasing PWATs (0.8-1 inch) will favor a mix of wet and dry storms across far northern CA into eastern OR and ID/MT from the afternoon into the evening hours. While the air mass in the low-levels will not be as dry as recent days, with increasing RH ahead of the front, 30-40 kt of mid-level flow should support faster northeastward storm motions of 25-30 kt. This will allow for less wetting rainfall as storms track eastward over areas of very receptive fuels supportive of lightning ignitions. Additionally, gusty outflow winds are expected, potentially impacting existing active fires across the area. The risk for lightning may continue overnight as the upper trough and front shift eastward towards ID and MT. IsoDryT highlights will remain, and have been expanded over areas of the expected driest fuels and storms. ...Southern Great Basin... As the mid-level trough continues eastward across the Northwest, southwesterly flow aloft should continue to promote locally breezy and dry conditions across portions of southern NV and western UT. South-southwest winds of up to 15 mph, along with daytime relative humidity as low as 15%, are expected in some valleys in the southern Great Basin. Amidst dry fuels, some locally elevated fire-weather conditions are possible. The lack of stronger winds for now precludes elevated highlights. ..Lyons.. 08/16/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0202 AM CDT Sat Aug 16 2025 Valid 161200Z - 171200Z ...Synopsis... A broad mid-level trough over the Northwestern US is forecast to consolidate and intensify today/tonight as it impinges on the northwestern edge of a ridge of high pressure over the central US. The tightening height gradient will bolster flow aloft, while at the same time, a surface cold front will move in from the Northwest. Monsoon moisture will support showers and thunderstorms along/ahead of the front, while localized dry and breezy conditions are possible over the Southwestern US. ...Northwest and Rockies Dry Thunder... Across the Northwest and central Rockies, persistent monsoon moisture will be in palace ahead of the upper trough and attendant cold front. Increasing PWATs (0.8-1 inch) will favor a mix of wet and dry storms across far northern CA into eastern OR and ID/MT from the afternoon into the evening hours. While the air mass in the low-levels will not be as dry as recent days, with increasing RH ahead of the front, 30-40 kt of mid-level flow should support faster northeastward storm motions of 25-30 kt. This will allow for less wetting rainfall as storms track eastward over areas of very receptive fuels supportive of lightning ignitions. Additionally, gusty outflow winds are expected, potentially impacting existing active fires across the area. The risk for lightning may continue overnight as the upper trough and front shift eastward towards ID and MT. IsoDryT highlights will remain, and have been expanded over areas of the expected driest fuels and storms. ...Southern Great Basin... As the mid-level trough continues eastward across the Northwest, southwesterly flow aloft should continue to promote locally breezy and dry conditions across portions of southern NV and western UT. South-southwest winds of up to 15 mph, along with daytime relative humidity as low as 15%, are expected in some valleys in the southern Great Basin. Amidst dry fuels, some locally elevated fire-weather conditions are possible. The lack of stronger winds for now precludes elevated highlights. ..Lyons.. 08/16/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0202 AM CDT Sat Aug 16 2025 Valid 161200Z - 171200Z ...Synopsis... A broad mid-level trough over the Northwestern US is forecast to consolidate and intensify today/tonight as it impinges on the northwestern edge of a ridge of high pressure over the central US. The tightening height gradient will bolster flow aloft, while at the same time, a surface cold front will move in from the Northwest. Monsoon moisture will support showers and thunderstorms along/ahead of the front, while localized dry and breezy conditions are possible over the Southwestern US. ...Northwest and Rockies Dry Thunder... Across the Northwest and central Rockies, persistent monsoon moisture will be in palace ahead of the upper trough and attendant cold front. Increasing PWATs (0.8-1 inch) will favor a mix of wet and dry storms across far northern CA into eastern OR and ID/MT from the afternoon into the evening hours. While the air mass in the low-levels will not be as dry as recent days, with increasing RH ahead of the front, 30-40 kt of mid-level flow should support faster northeastward storm motions of 25-30 kt. This will allow for less wetting rainfall as storms track eastward over areas of very receptive fuels supportive of lightning ignitions. Additionally, gusty outflow winds are expected, potentially impacting existing active fires across the area. The risk for lightning may continue overnight as the upper trough and front shift eastward towards ID and MT. IsoDryT highlights will remain, and have been expanded over areas of the expected driest fuels and storms. ...Southern Great Basin... As the mid-level trough continues eastward across the Northwest, southwesterly flow aloft should continue to promote locally breezy and dry conditions across portions of southern NV and western UT. South-southwest winds of up to 15 mph, along with daytime relative humidity as low as 15%, are expected in some valleys in the southern Great Basin. Amidst dry fuels, some locally elevated fire-weather conditions are possible. The lack of stronger winds for now precludes elevated highlights. ..Lyons.. 08/16/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0202 AM CDT Sat Aug 16 2025 Valid 161200Z - 171200Z ...Synopsis... A broad mid-level trough over the Northwestern US is forecast to consolidate and intensify today/tonight as it impinges on the northwestern edge of a ridge of high pressure over the central US. The tightening height gradient will bolster flow aloft, while at the same time, a surface cold front will move in from the Northwest. Monsoon moisture will support showers and thunderstorms along/ahead of the front, while localized dry and breezy conditions are possible over the Southwestern US. ...Northwest and Rockies Dry Thunder... Across the Northwest and central Rockies, persistent monsoon moisture will be in palace ahead of the upper trough and attendant cold front. Increasing PWATs (0.8-1 inch) will favor a mix of wet and dry storms across far northern CA into eastern OR and ID/MT from the afternoon into the evening hours. While the air mass in the low-levels will not be as dry as recent days, with increasing RH ahead of the front, 30-40 kt of mid-level flow should support faster northeastward storm motions of 25-30 kt. This will allow for less wetting rainfall as storms track eastward over areas of very receptive fuels supportive of lightning ignitions. Additionally, gusty outflow winds are expected, potentially impacting existing active fires across the area. The risk for lightning may continue overnight as the upper trough and front shift eastward towards ID and MT. IsoDryT highlights will remain, and have been expanded over areas of the expected driest fuels and storms. ...Southern Great Basin... As the mid-level trough continues eastward across the Northwest, southwesterly flow aloft should continue to promote locally breezy and dry conditions across portions of southern NV and western UT. South-southwest winds of up to 15 mph, along with daytime relative humidity as low as 15%, are expected in some valleys in the southern Great Basin. Amidst dry fuels, some locally elevated fire-weather conditions are possible. The lack of stronger winds for now precludes elevated highlights. ..Lyons.. 08/16/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0202 AM CDT Sat Aug 16 2025 Valid 161200Z - 171200Z ...Synopsis... A broad mid-level trough over the Northwestern US is forecast to consolidate and intensify today/tonight as it impinges on the northwestern edge of a ridge of high pressure over the central US. The tightening height gradient will bolster flow aloft, while at the same time, a surface cold front will move in from the Northwest. Monsoon moisture will support showers and thunderstorms along/ahead of the front, while localized dry and breezy conditions are possible over the Southwestern US. ...Northwest and Rockies Dry Thunder... Across the Northwest and central Rockies, persistent monsoon moisture will be in palace ahead of the upper trough and attendant cold front. Increasing PWATs (0.8-1 inch) will favor a mix of wet and dry storms across far northern CA into eastern OR and ID/MT from the afternoon into the evening hours. While the air mass in the low-levels will not be as dry as recent days, with increasing RH ahead of the front, 30-40 kt of mid-level flow should support faster northeastward storm motions of 25-30 kt. This will allow for less wetting rainfall as storms track eastward over areas of very receptive fuels supportive of lightning ignitions. Additionally, gusty outflow winds are expected, potentially impacting existing active fires across the area. The risk for lightning may continue overnight as the upper trough and front shift eastward towards ID and MT. IsoDryT highlights will remain, and have been expanded over areas of the expected driest fuels and storms. ...Southern Great Basin... As the mid-level trough continues eastward across the Northwest, southwesterly flow aloft should continue to promote locally breezy and dry conditions across portions of southern NV and western UT. South-southwest winds of up to 15 mph, along with daytime relative humidity as low as 15%, are expected in some valleys in the southern Great Basin. Amidst dry fuels, some locally elevated fire-weather conditions are possible. The lack of stronger winds for now precludes elevated highlights. ..Lyons.. 08/16/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0202 AM CDT Sat Aug 16 2025 Valid 161200Z - 171200Z ...Synopsis... A broad mid-level trough over the Northwestern US is forecast to consolidate and intensify today/tonight as it impinges on the northwestern edge of a ridge of high pressure over the central US. The tightening height gradient will bolster flow aloft, while at the same time, a surface cold front will move in from the Northwest. Monsoon moisture will support showers and thunderstorms along/ahead of the front, while localized dry and breezy conditions are possible over the Southwestern US. ...Northwest and Rockies Dry Thunder... Across the Northwest and central Rockies, persistent monsoon moisture will be in palace ahead of the upper trough and attendant cold front. Increasing PWATs (0.8-1 inch) will favor a mix of wet and dry storms across far northern CA into eastern OR and ID/MT from the afternoon into the evening hours. While the air mass in the low-levels will not be as dry as recent days, with increasing RH ahead of the front, 30-40 kt of mid-level flow should support faster northeastward storm motions of 25-30 kt. This will allow for less wetting rainfall as storms track eastward over areas of very receptive fuels supportive of lightning ignitions. Additionally, gusty outflow winds are expected, potentially impacting existing active fires across the area. The risk for lightning may continue overnight as the upper trough and front shift eastward towards ID and MT. IsoDryT highlights will remain, and have been expanded over areas of the expected driest fuels and storms. ...Southern Great Basin... As the mid-level trough continues eastward across the Northwest, southwesterly flow aloft should continue to promote locally breezy and dry conditions across portions of southern NV and western UT. South-southwest winds of up to 15 mph, along with daytime relative humidity as low as 15%, are expected in some valleys in the southern Great Basin. Amidst dry fuels, some locally elevated fire-weather conditions are possible. The lack of stronger winds for now precludes elevated highlights. ..Lyons.. 08/16/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0202 AM CDT Sat Aug 16 2025 Valid 161200Z - 171200Z ...Synopsis... A broad mid-level trough over the Northwestern US is forecast to consolidate and intensify today/tonight as it impinges on the northwestern edge of a ridge of high pressure over the central US. The tightening height gradient will bolster flow aloft, while at the same time, a surface cold front will move in from the Northwest. Monsoon moisture will support showers and thunderstorms along/ahead of the front, while localized dry and breezy conditions are possible over the Southwestern US. ...Northwest and Rockies Dry Thunder... Across the Northwest and central Rockies, persistent monsoon moisture will be in palace ahead of the upper trough and attendant cold front. Increasing PWATs (0.8-1 inch) will favor a mix of wet and dry storms across far northern CA into eastern OR and ID/MT from the afternoon into the evening hours. While the air mass in the low-levels will not be as dry as recent days, with increasing RH ahead of the front, 30-40 kt of mid-level flow should support faster northeastward storm motions of 25-30 kt. This will allow for less wetting rainfall as storms track eastward over areas of very receptive fuels supportive of lightning ignitions. Additionally, gusty outflow winds are expected, potentially impacting existing active fires across the area. The risk for lightning may continue overnight as the upper trough and front shift eastward towards ID and MT. IsoDryT highlights will remain, and have been expanded over areas of the expected driest fuels and storms. ...Southern Great Basin... As the mid-level trough continues eastward across the Northwest, southwesterly flow aloft should continue to promote locally breezy and dry conditions across portions of southern NV and western UT. South-southwest winds of up to 15 mph, along with daytime relative humidity as low as 15%, are expected in some valleys in the southern Great Basin. Amidst dry fuels, some locally elevated fire-weather conditions are possible. The lack of stronger winds for now precludes elevated highlights. ..Lyons.. 08/16/2025 ...Please see www.spc.noaa.gov/fire for graphic product... Read more