Severe Storms

SPC 1930Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0156 PM CDT Wed Jul 02 2025 Valid 041200Z - 051200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ON FRIDAY OVER PARTS OF THE EASTERN DAKOTAS AND UPPER MIDWEST... ...SUMMARY... Scattered strong to severe thunderstorms are expected across portions of the northern Plains and Upper Midwest on Friday. ...Dakotas and Upper Midwest... The band of primary westerly flow will be relegated to the northern tier of states on Friday, with a pronounced shortwave trough moving across southern SK/MT and into the northern Plains. Models are in general consensus that scattered afternoon thunderstorms will develop along the associated cold front over the eastern Dakotas. Relatively warm/moist and unstable conditions ahead of the front, coupled with favorable westerly flow aloft, will promote a risk of severe storms capable of damaging winds and some hail. There remain differences between the various 12z model solutions regarding timing and intensity of the approaching trough. This lends sufficient uncertainty to the corridor of greatest concern to maintain only MRGL risk at this time. However, parts of the area will likely need upgraded in later outlooks as details become clearer. ...ID/MT... A strong shortwave trough will track into the western states on Friday, promoting scattered afternoon thunderstorm development over parts of the northern Great Basin and northern Rockies. There is some concern for a few storms capable of damaging winds and hail over the region Friday evening, but model solutions remain to diverse to add a risk area at this time. ..Hart.. 07/02/2025 Read more

SPC 1930Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0156 PM CDT Wed Jul 02 2025 Valid 041200Z - 051200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ON FRIDAY OVER PARTS OF THE EASTERN DAKOTAS AND UPPER MIDWEST... ...SUMMARY... Scattered strong to severe thunderstorms are expected across portions of the northern Plains and Upper Midwest on Friday. ...Dakotas and Upper Midwest... The band of primary westerly flow will be relegated to the northern tier of states on Friday, with a pronounced shortwave trough moving across southern SK/MT and into the northern Plains. Models are in general consensus that scattered afternoon thunderstorms will develop along the associated cold front over the eastern Dakotas. Relatively warm/moist and unstable conditions ahead of the front, coupled with favorable westerly flow aloft, will promote a risk of severe storms capable of damaging winds and some hail. There remain differences between the various 12z model solutions regarding timing and intensity of the approaching trough. This lends sufficient uncertainty to the corridor of greatest concern to maintain only MRGL risk at this time. However, parts of the area will likely need upgraded in later outlooks as details become clearer. ...ID/MT... A strong shortwave trough will track into the western states on Friday, promoting scattered afternoon thunderstorm development over parts of the northern Great Basin and northern Rockies. There is some concern for a few storms capable of damaging winds and hail over the region Friday evening, but model solutions remain to diverse to add a risk area at this time. ..Hart.. 07/02/2025 Read more

SPC 1930Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0156 PM CDT Wed Jul 02 2025 Valid 041200Z - 051200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ON FRIDAY OVER PARTS OF THE EASTERN DAKOTAS AND UPPER MIDWEST... ...SUMMARY... Scattered strong to severe thunderstorms are expected across portions of the northern Plains and Upper Midwest on Friday. ...Dakotas and Upper Midwest... The band of primary westerly flow will be relegated to the northern tier of states on Friday, with a pronounced shortwave trough moving across southern SK/MT and into the northern Plains. Models are in general consensus that scattered afternoon thunderstorms will develop along the associated cold front over the eastern Dakotas. Relatively warm/moist and unstable conditions ahead of the front, coupled with favorable westerly flow aloft, will promote a risk of severe storms capable of damaging winds and some hail. There remain differences between the various 12z model solutions regarding timing and intensity of the approaching trough. This lends sufficient uncertainty to the corridor of greatest concern to maintain only MRGL risk at this time. However, parts of the area will likely need upgraded in later outlooks as details become clearer. ...ID/MT... A strong shortwave trough will track into the western states on Friday, promoting scattered afternoon thunderstorm development over parts of the northern Great Basin and northern Rockies. There is some concern for a few storms capable of damaging winds and hail over the region Friday evening, but model solutions remain to diverse to add a risk area at this time. ..Hart.. 07/02/2025 Read more

SPC 1930Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0156 PM CDT Wed Jul 02 2025 Valid 041200Z - 051200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ON FRIDAY OVER PARTS OF THE EASTERN DAKOTAS AND UPPER MIDWEST... ...SUMMARY... Scattered strong to severe thunderstorms are expected across portions of the northern Plains and Upper Midwest on Friday. ...Dakotas and Upper Midwest... The band of primary westerly flow will be relegated to the northern tier of states on Friday, with a pronounced shortwave trough moving across southern SK/MT and into the northern Plains. Models are in general consensus that scattered afternoon thunderstorms will develop along the associated cold front over the eastern Dakotas. Relatively warm/moist and unstable conditions ahead of the front, coupled with favorable westerly flow aloft, will promote a risk of severe storms capable of damaging winds and some hail. There remain differences between the various 12z model solutions regarding timing and intensity of the approaching trough. This lends sufficient uncertainty to the corridor of greatest concern to maintain only MRGL risk at this time. However, parts of the area will likely need upgraded in later outlooks as details become clearer. ...ID/MT... A strong shortwave trough will track into the western states on Friday, promoting scattered afternoon thunderstorm development over parts of the northern Great Basin and northern Rockies. There is some concern for a few storms capable of damaging winds and hail over the region Friday evening, but model solutions remain to diverse to add a risk area at this time. ..Hart.. 07/02/2025 Read more

SPC 1930Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0156 PM CDT Wed Jul 02 2025 Valid 041200Z - 051200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ON FRIDAY OVER PARTS OF THE EASTERN DAKOTAS AND UPPER MIDWEST... ...SUMMARY... Scattered strong to severe thunderstorms are expected across portions of the northern Plains and Upper Midwest on Friday. ...Dakotas and Upper Midwest... The band of primary westerly flow will be relegated to the northern tier of states on Friday, with a pronounced shortwave trough moving across southern SK/MT and into the northern Plains. Models are in general consensus that scattered afternoon thunderstorms will develop along the associated cold front over the eastern Dakotas. Relatively warm/moist and unstable conditions ahead of the front, coupled with favorable westerly flow aloft, will promote a risk of severe storms capable of damaging winds and some hail. There remain differences between the various 12z model solutions regarding timing and intensity of the approaching trough. This lends sufficient uncertainty to the corridor of greatest concern to maintain only MRGL risk at this time. However, parts of the area will likely need upgraded in later outlooks as details become clearer. ...ID/MT... A strong shortwave trough will track into the western states on Friday, promoting scattered afternoon thunderstorm development over parts of the northern Great Basin and northern Rockies. There is some concern for a few storms capable of damaging winds and hail over the region Friday evening, but model solutions remain to diverse to add a risk area at this time. ..Hart.. 07/02/2025 Read more

SPC 1930Z Day 3 Outlook
Day 3 Convective Outlook NWS Storm Prediction Center Norman OK 0156 PM CDT Wed Jul 02 2025 Valid 041200Z - 051200Z ...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ON FRIDAY OVER PARTS OF THE EASTERN DAKOTAS AND UPPER MIDWEST... ...SUMMARY... Scattered strong to severe thunderstorms are expected across portions of the northern Plains and Upper Midwest on Friday. ...Dakotas and Upper Midwest... The band of primary westerly flow will be relegated to the northern tier of states on Friday, with a pronounced shortwave trough moving across southern SK/MT and into the northern Plains. Models are in general consensus that scattered afternoon thunderstorms will develop along the associated cold front over the eastern Dakotas. Relatively warm/moist and unstable conditions ahead of the front, coupled with favorable westerly flow aloft, will promote a risk of severe storms capable of damaging winds and some hail. There remain differences between the various 12z model solutions regarding timing and intensity of the approaching trough. This lends sufficient uncertainty to the corridor of greatest concern to maintain only MRGL risk at this time. However, parts of the area will likely need upgraded in later outlooks as details become clearer. ...ID/MT... A strong shortwave trough will track into the western states on Friday, promoting scattered afternoon thunderstorm development over parts of the northern Great Basin and northern Rockies. There is some concern for a few storms capable of damaging winds and hail over the region Friday evening, but model solutions remain to diverse to add a risk area at this time. ..Hart.. 07/02/2025 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1227 PM CDT Wed Jul 02 2025 Valid 031200Z - 041200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THURSDAY AFTERNOON AND EVENING OVER PORTIONS OF THE NORTHEAST US...AND OVER PARTS OF NORTH DAKOTA.... ...SUMMARY... Scattered storms capable of severe wind gusts and hail are forecast across the Northeast US and North Dakota on Thursday. ...Northeast... A shortwave trough currently over western Ontario will track southeastward across the Great Lakes on Thursday. Increasing large scale forcing will overspread parts of PA/NY and New England through the day, promoting afternoon thunderstorm development along an approaching cold front. A warm/humid air mass will be present ahead of the front, with steep low-level lapse rates and sufficient CAPE to pose a risk of damaging wind gusts and perhaps some hail. Given trends in 12z model guidance regarding thunderstorm coverage, have added a SLGT risk for portions of the region. ...ND... A prominent mid-level ridge will be established over the central US tomorrow. Model guidance suggests a subtle shortwave trough will track into eastern MT during the afternoon and top the ridge overnight. Southerly low-level winds will help to draw moisture northward into ND by late afternoon, resulting in a reservoir of strong instability. Thunderstorms are expected to develop over western ND posing a risk of large hail and damaging winds. Several 12z HREF members suggest the risk of upscale growth and a bowing MCS tracking eastward across ND overnight. ...Upper MS Valley... A weak/diffuse low-level baroclinic zone will extend from southeast MN into IL on Thursday. Strengthening southwesterly low-level winds will enhance warm advection by early evening, leading to scattered thunderstorms. A few of these storms could be strong, posing a risk of gusty winds and hail. ..Hart.. 07/02/2025 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1227 PM CDT Wed Jul 02 2025 Valid 031200Z - 041200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THURSDAY AFTERNOON AND EVENING OVER PORTIONS OF THE NORTHEAST US...AND OVER PARTS OF NORTH DAKOTA.... ...SUMMARY... Scattered storms capable of severe wind gusts and hail are forecast across the Northeast US and North Dakota on Thursday. ...Northeast... A shortwave trough currently over western Ontario will track southeastward across the Great Lakes on Thursday. Increasing large scale forcing will overspread parts of PA/NY and New England through the day, promoting afternoon thunderstorm development along an approaching cold front. A warm/humid air mass will be present ahead of the front, with steep low-level lapse rates and sufficient CAPE to pose a risk of damaging wind gusts and perhaps some hail. Given trends in 12z model guidance regarding thunderstorm coverage, have added a SLGT risk for portions of the region. ...ND... A prominent mid-level ridge will be established over the central US tomorrow. Model guidance suggests a subtle shortwave trough will track into eastern MT during the afternoon and top the ridge overnight. Southerly low-level winds will help to draw moisture northward into ND by late afternoon, resulting in a reservoir of strong instability. Thunderstorms are expected to develop over western ND posing a risk of large hail and damaging winds. Several 12z HREF members suggest the risk of upscale growth and a bowing MCS tracking eastward across ND overnight. ...Upper MS Valley... A weak/diffuse low-level baroclinic zone will extend from southeast MN into IL on Thursday. Strengthening southwesterly low-level winds will enhance warm advection by early evening, leading to scattered thunderstorms. A few of these storms could be strong, posing a risk of gusty winds and hail. ..Hart.. 07/02/2025 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1227 PM CDT Wed Jul 02 2025 Valid 031200Z - 041200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THURSDAY AFTERNOON AND EVENING OVER PORTIONS OF THE NORTHEAST US...AND OVER PARTS OF NORTH DAKOTA.... ...SUMMARY... Scattered storms capable of severe wind gusts and hail are forecast across the Northeast US and North Dakota on Thursday. ...Northeast... A shortwave trough currently over western Ontario will track southeastward across the Great Lakes on Thursday. Increasing large scale forcing will overspread parts of PA/NY and New England through the day, promoting afternoon thunderstorm development along an approaching cold front. A warm/humid air mass will be present ahead of the front, with steep low-level lapse rates and sufficient CAPE to pose a risk of damaging wind gusts and perhaps some hail. Given trends in 12z model guidance regarding thunderstorm coverage, have added a SLGT risk for portions of the region. ...ND... A prominent mid-level ridge will be established over the central US tomorrow. Model guidance suggests a subtle shortwave trough will track into eastern MT during the afternoon and top the ridge overnight. Southerly low-level winds will help to draw moisture northward into ND by late afternoon, resulting in a reservoir of strong instability. Thunderstorms are expected to develop over western ND posing a risk of large hail and damaging winds. Several 12z HREF members suggest the risk of upscale growth and a bowing MCS tracking eastward across ND overnight. ...Upper MS Valley... A weak/diffuse low-level baroclinic zone will extend from southeast MN into IL on Thursday. Strengthening southwesterly low-level winds will enhance warm advection by early evening, leading to scattered thunderstorms. A few of these storms could be strong, posing a risk of gusty winds and hail. ..Hart.. 07/02/2025 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1227 PM CDT Wed Jul 02 2025 Valid 031200Z - 041200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THURSDAY AFTERNOON AND EVENING OVER PORTIONS OF THE NORTHEAST US...AND OVER PARTS OF NORTH DAKOTA.... ...SUMMARY... Scattered storms capable of severe wind gusts and hail are forecast across the Northeast US and North Dakota on Thursday. ...Northeast... A shortwave trough currently over western Ontario will track southeastward across the Great Lakes on Thursday. Increasing large scale forcing will overspread parts of PA/NY and New England through the day, promoting afternoon thunderstorm development along an approaching cold front. A warm/humid air mass will be present ahead of the front, with steep low-level lapse rates and sufficient CAPE to pose a risk of damaging wind gusts and perhaps some hail. Given trends in 12z model guidance regarding thunderstorm coverage, have added a SLGT risk for portions of the region. ...ND... A prominent mid-level ridge will be established over the central US tomorrow. Model guidance suggests a subtle shortwave trough will track into eastern MT during the afternoon and top the ridge overnight. Southerly low-level winds will help to draw moisture northward into ND by late afternoon, resulting in a reservoir of strong instability. Thunderstorms are expected to develop over western ND posing a risk of large hail and damaging winds. Several 12z HREF members suggest the risk of upscale growth and a bowing MCS tracking eastward across ND overnight. ...Upper MS Valley... A weak/diffuse low-level baroclinic zone will extend from southeast MN into IL on Thursday. Strengthening southwesterly low-level winds will enhance warm advection by early evening, leading to scattered thunderstorms. A few of these storms could be strong, posing a risk of gusty winds and hail. ..Hart.. 07/02/2025 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1227 PM CDT Wed Jul 02 2025 Valid 031200Z - 041200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THURSDAY AFTERNOON AND EVENING OVER PORTIONS OF THE NORTHEAST US...AND OVER PARTS OF NORTH DAKOTA.... ...SUMMARY... Scattered storms capable of severe wind gusts and hail are forecast across the Northeast US and North Dakota on Thursday. ...Northeast... A shortwave trough currently over western Ontario will track southeastward across the Great Lakes on Thursday. Increasing large scale forcing will overspread parts of PA/NY and New England through the day, promoting afternoon thunderstorm development along an approaching cold front. A warm/humid air mass will be present ahead of the front, with steep low-level lapse rates and sufficient CAPE to pose a risk of damaging wind gusts and perhaps some hail. Given trends in 12z model guidance regarding thunderstorm coverage, have added a SLGT risk for portions of the region. ...ND... A prominent mid-level ridge will be established over the central US tomorrow. Model guidance suggests a subtle shortwave trough will track into eastern MT during the afternoon and top the ridge overnight. Southerly low-level winds will help to draw moisture northward into ND by late afternoon, resulting in a reservoir of strong instability. Thunderstorms are expected to develop over western ND posing a risk of large hail and damaging winds. Several 12z HREF members suggest the risk of upscale growth and a bowing MCS tracking eastward across ND overnight. ...Upper MS Valley... A weak/diffuse low-level baroclinic zone will extend from southeast MN into IL on Thursday. Strengthening southwesterly low-level winds will enhance warm advection by early evening, leading to scattered thunderstorms. A few of these storms could be strong, posing a risk of gusty winds and hail. ..Hart.. 07/02/2025 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1227 PM CDT Wed Jul 02 2025 Valid 031200Z - 041200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THURSDAY AFTERNOON AND EVENING OVER PORTIONS OF THE NORTHEAST US...AND OVER PARTS OF NORTH DAKOTA.... ...SUMMARY... Scattered storms capable of severe wind gusts and hail are forecast across the Northeast US and North Dakota on Thursday. ...Northeast... A shortwave trough currently over western Ontario will track southeastward across the Great Lakes on Thursday. Increasing large scale forcing will overspread parts of PA/NY and New England through the day, promoting afternoon thunderstorm development along an approaching cold front. A warm/humid air mass will be present ahead of the front, with steep low-level lapse rates and sufficient CAPE to pose a risk of damaging wind gusts and perhaps some hail. Given trends in 12z model guidance regarding thunderstorm coverage, have added a SLGT risk for portions of the region. ...ND... A prominent mid-level ridge will be established over the central US tomorrow. Model guidance suggests a subtle shortwave trough will track into eastern MT during the afternoon and top the ridge overnight. Southerly low-level winds will help to draw moisture northward into ND by late afternoon, resulting in a reservoir of strong instability. Thunderstorms are expected to develop over western ND posing a risk of large hail and damaging winds. Several 12z HREF members suggest the risk of upscale growth and a bowing MCS tracking eastward across ND overnight. ...Upper MS Valley... A weak/diffuse low-level baroclinic zone will extend from southeast MN into IL on Thursday. Strengthening southwesterly low-level winds will enhance warm advection by early evening, leading to scattered thunderstorms. A few of these storms could be strong, posing a risk of gusty winds and hail. ..Hart.. 07/02/2025 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1227 PM CDT Wed Jul 02 2025 Valid 031200Z - 041200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THURSDAY AFTERNOON AND EVENING OVER PORTIONS OF THE NORTHEAST US...AND OVER PARTS OF NORTH DAKOTA.... ...SUMMARY... Scattered storms capable of severe wind gusts and hail are forecast across the Northeast US and North Dakota on Thursday. ...Northeast... A shortwave trough currently over western Ontario will track southeastward across the Great Lakes on Thursday. Increasing large scale forcing will overspread parts of PA/NY and New England through the day, promoting afternoon thunderstorm development along an approaching cold front. A warm/humid air mass will be present ahead of the front, with steep low-level lapse rates and sufficient CAPE to pose a risk of damaging wind gusts and perhaps some hail. Given trends in 12z model guidance regarding thunderstorm coverage, have added a SLGT risk for portions of the region. ...ND... A prominent mid-level ridge will be established over the central US tomorrow. Model guidance suggests a subtle shortwave trough will track into eastern MT during the afternoon and top the ridge overnight. Southerly low-level winds will help to draw moisture northward into ND by late afternoon, resulting in a reservoir of strong instability. Thunderstorms are expected to develop over western ND posing a risk of large hail and damaging winds. Several 12z HREF members suggest the risk of upscale growth and a bowing MCS tracking eastward across ND overnight. ...Upper MS Valley... A weak/diffuse low-level baroclinic zone will extend from southeast MN into IL on Thursday. Strengthening southwesterly low-level winds will enhance warm advection by early evening, leading to scattered thunderstorms. A few of these storms could be strong, posing a risk of gusty winds and hail. ..Hart.. 07/02/2025 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1227 PM CDT Wed Jul 02 2025 Valid 031200Z - 041200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THURSDAY AFTERNOON AND EVENING OVER PORTIONS OF THE NORTHEAST US...AND OVER PARTS OF NORTH DAKOTA.... ...SUMMARY... Scattered storms capable of severe wind gusts and hail are forecast across the Northeast US and North Dakota on Thursday. ...Northeast... A shortwave trough currently over western Ontario will track southeastward across the Great Lakes on Thursday. Increasing large scale forcing will overspread parts of PA/NY and New England through the day, promoting afternoon thunderstorm development along an approaching cold front. A warm/humid air mass will be present ahead of the front, with steep low-level lapse rates and sufficient CAPE to pose a risk of damaging wind gusts and perhaps some hail. Given trends in 12z model guidance regarding thunderstorm coverage, have added a SLGT risk for portions of the region. ...ND... A prominent mid-level ridge will be established over the central US tomorrow. Model guidance suggests a subtle shortwave trough will track into eastern MT during the afternoon and top the ridge overnight. Southerly low-level winds will help to draw moisture northward into ND by late afternoon, resulting in a reservoir of strong instability. Thunderstorms are expected to develop over western ND posing a risk of large hail and damaging winds. Several 12z HREF members suggest the risk of upscale growth and a bowing MCS tracking eastward across ND overnight. ...Upper MS Valley... A weak/diffuse low-level baroclinic zone will extend from southeast MN into IL on Thursday. Strengthening southwesterly low-level winds will enhance warm advection by early evening, leading to scattered thunderstorms. A few of these storms could be strong, posing a risk of gusty winds and hail. ..Hart.. 07/02/2025 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1227 PM CDT Wed Jul 02 2025 Valid 031200Z - 041200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THURSDAY AFTERNOON AND EVENING OVER PORTIONS OF THE NORTHEAST US...AND OVER PARTS OF NORTH DAKOTA.... ...SUMMARY... Scattered storms capable of severe wind gusts and hail are forecast across the Northeast US and North Dakota on Thursday. ...Northeast... A shortwave trough currently over western Ontario will track southeastward across the Great Lakes on Thursday. Increasing large scale forcing will overspread parts of PA/NY and New England through the day, promoting afternoon thunderstorm development along an approaching cold front. A warm/humid air mass will be present ahead of the front, with steep low-level lapse rates and sufficient CAPE to pose a risk of damaging wind gusts and perhaps some hail. Given trends in 12z model guidance regarding thunderstorm coverage, have added a SLGT risk for portions of the region. ...ND... A prominent mid-level ridge will be established over the central US tomorrow. Model guidance suggests a subtle shortwave trough will track into eastern MT during the afternoon and top the ridge overnight. Southerly low-level winds will help to draw moisture northward into ND by late afternoon, resulting in a reservoir of strong instability. Thunderstorms are expected to develop over western ND posing a risk of large hail and damaging winds. Several 12z HREF members suggest the risk of upscale growth and a bowing MCS tracking eastward across ND overnight. ...Upper MS Valley... A weak/diffuse low-level baroclinic zone will extend from southeast MN into IL on Thursday. Strengthening southwesterly low-level winds will enhance warm advection by early evening, leading to scattered thunderstorms. A few of these storms could be strong, posing a risk of gusty winds and hail. ..Hart.. 07/02/2025 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1227 PM CDT Wed Jul 02 2025 Valid 031200Z - 041200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THURSDAY AFTERNOON AND EVENING OVER PORTIONS OF THE NORTHEAST US...AND OVER PARTS OF NORTH DAKOTA.... ...SUMMARY... Scattered storms capable of severe wind gusts and hail are forecast across the Northeast US and North Dakota on Thursday. ...Northeast... A shortwave trough currently over western Ontario will track southeastward across the Great Lakes on Thursday. Increasing large scale forcing will overspread parts of PA/NY and New England through the day, promoting afternoon thunderstorm development along an approaching cold front. A warm/humid air mass will be present ahead of the front, with steep low-level lapse rates and sufficient CAPE to pose a risk of damaging wind gusts and perhaps some hail. Given trends in 12z model guidance regarding thunderstorm coverage, have added a SLGT risk for portions of the region. ...ND... A prominent mid-level ridge will be established over the central US tomorrow. Model guidance suggests a subtle shortwave trough will track into eastern MT during the afternoon and top the ridge overnight. Southerly low-level winds will help to draw moisture northward into ND by late afternoon, resulting in a reservoir of strong instability. Thunderstorms are expected to develop over western ND posing a risk of large hail and damaging winds. Several 12z HREF members suggest the risk of upscale growth and a bowing MCS tracking eastward across ND overnight. ...Upper MS Valley... A weak/diffuse low-level baroclinic zone will extend from southeast MN into IL on Thursday. Strengthening southwesterly low-level winds will enhance warm advection by early evening, leading to scattered thunderstorms. A few of these storms could be strong, posing a risk of gusty winds and hail. ..Hart.. 07/02/2025 Read more

SPC 1730Z Day 2 Outlook
Day 2 Convective Outlook NWS Storm Prediction Center Norman OK 1227 PM CDT Wed Jul 02 2025 Valid 031200Z - 041200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THURSDAY AFTERNOON AND EVENING OVER PORTIONS OF THE NORTHEAST US...AND OVER PARTS OF NORTH DAKOTA.... ...SUMMARY... Scattered storms capable of severe wind gusts and hail are forecast across the Northeast US and North Dakota on Thursday. ...Northeast... A shortwave trough currently over western Ontario will track southeastward across the Great Lakes on Thursday. Increasing large scale forcing will overspread parts of PA/NY and New England through the day, promoting afternoon thunderstorm development along an approaching cold front. A warm/humid air mass will be present ahead of the front, with steep low-level lapse rates and sufficient CAPE to pose a risk of damaging wind gusts and perhaps some hail. Given trends in 12z model guidance regarding thunderstorm coverage, have added a SLGT risk for portions of the region. ...ND... A prominent mid-level ridge will be established over the central US tomorrow. Model guidance suggests a subtle shortwave trough will track into eastern MT during the afternoon and top the ridge overnight. Southerly low-level winds will help to draw moisture northward into ND by late afternoon, resulting in a reservoir of strong instability. Thunderstorms are expected to develop over western ND posing a risk of large hail and damaging winds. Several 12z HREF members suggest the risk of upscale growth and a bowing MCS tracking eastward across ND overnight. ...Upper MS Valley... A weak/diffuse low-level baroclinic zone will extend from southeast MN into IL on Thursday. Strengthening southwesterly low-level winds will enhance warm advection by early evening, leading to scattered thunderstorms. A few of these storms could be strong, posing a risk of gusty winds and hail. ..Hart.. 07/02/2025 Read more

SPC Day 1 Fire Weather Outlook
Day 1 Fire Weather Outlook NWS Storm Prediction Center Norman OK 1153 AM CDT Wed Jul 02 2025 Valid 021700Z - 031200Z ...Nevada... Anomalously high precipitable water values, including observed an observed value of nearly 1 inch from the 1200Z Las Vegas sounding, suggests higher precipitation efficiency from expected showers and thunderstorms moving into southern Nevada today. This will limit dry lightning ignition efficiency across southern Nevada. A relatively dry sub-cloud layer remains in place across central and northern Nevada, where initially high-based shower and thunderstorm development is expected through the day, increasing potential for ignition over dry fuels denoted by a general northward shift in Isolated Dry Thunderstorm highlights. ...Far Northeastern California into southeastern Oregon... Stronger mid-level winds and accelerated northeast thunderstorm motions owing to an encroaching mid-level trough into the Pacific Northwest will limit precipitation and increase ignition likelihood amid drier fuels across northeastern California into southeastern Oregon this afternoon. Isolated Dry Thunderstorm highlights were added to reflect this threat for today. ..Williams.. 07/02/2025 .PREV DISCUSSION... /ISSUED 0225 AM CDT Wed Jul 02 2025/ ...Synopsis... Mid-level troughing is forecast to slowly progress across central CA today, while another trough moves onshore across WA. Decreasing heights over the Northwest will continue to provide southerly transport of monsoon moisture into portions of the Great Basin and Intermountain West, where numerous thunderstorms are likely. Dry and breezy conditions will also be likely over the Cascades and western Columbia Basin. ...Lee of the Cascades... Increasing flow aloft ahead of the Pacific trough will favor dry downslope winds across the Cascades and western Columbia Basin. With daytime temperatures well into the 90s F, deep mixing will promote low boundary layer RH of 15-20%. With downslope winds of 15-25 mph, widespread elevated fire-weather conditions are likely on the lee slopes and through the gaps of the higher terrain. Some localized critical conditions are also possible where the terrain-enhanced winds and locally drier conditions may develop for a few hours this afternoon. ...Great Basin and northern Rockies Dry Thunder... East of the upper low, widespread thunderstorm activity is expected across the Great Basin and western slopes of the Rockies. A monsoon surge of 0.8 to 1.0 inch PWATs will lift northward across central/eastern NV into UT and western CO/WY. Weak ascent from the trough, along with diurnal heating of the terrain will result in scattered to numerous high-based showers and thunderstorms by early afternoon. Additional storms are likely along a cold front across ID and western MT. Given the increasing moisture content and continued southerly flow, some wetting rainfall is expected from training rounds of thunderstorms. A mix of wet and dry thunderstorms will support potential lightning ignitions, particularly with fast moving cells and on the edges of the most intense downdraft cores. This appears most likely across parts of eastern UT and western CO where less wetting rainfall is expected. Though isolated dry strikes are possible over the entire IsoDryT area. ...Northern OR/Southern CA... Scattered thunderstorms are again expected ahead of the upper low. A few of these storms may be drier with 30+ kt of southerly flow and relatively deeply mixed boundary layers. While a few dry strikes are possible outside of the heavier cores, recent QPE estimates of 0.5 to 1 inches indicate area fuels have likely been tempered to some degree. This suggests the threat for dry lightning is below IsoDryT thresholds. ...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 1153 AM CDT Wed Jul 02 2025 Valid 021700Z - 031200Z ...Nevada... Anomalously high precipitable water values, including observed an observed value of nearly 1 inch from the 1200Z Las Vegas sounding, suggests higher precipitation efficiency from expected showers and thunderstorms moving into southern Nevada today. This will limit dry lightning ignition efficiency across southern Nevada. A relatively dry sub-cloud layer remains in place across central and northern Nevada, where initially high-based shower and thunderstorm development is expected through the day, increasing potential for ignition over dry fuels denoted by a general northward shift in Isolated Dry Thunderstorm highlights. ...Far Northeastern California into southeastern Oregon... Stronger mid-level winds and accelerated northeast thunderstorm motions owing to an encroaching mid-level trough into the Pacific Northwest will limit precipitation and increase ignition likelihood amid drier fuels across northeastern California into southeastern Oregon this afternoon. Isolated Dry Thunderstorm highlights were added to reflect this threat for today. ..Williams.. 07/02/2025 .PREV DISCUSSION... /ISSUED 0225 AM CDT Wed Jul 02 2025/ ...Synopsis... Mid-level troughing is forecast to slowly progress across central CA today, while another trough moves onshore across WA. Decreasing heights over the Northwest will continue to provide southerly transport of monsoon moisture into portions of the Great Basin and Intermountain West, where numerous thunderstorms are likely. Dry and breezy conditions will also be likely over the Cascades and western Columbia Basin. ...Lee of the Cascades... Increasing flow aloft ahead of the Pacific trough will favor dry downslope winds across the Cascades and western Columbia Basin. With daytime temperatures well into the 90s F, deep mixing will promote low boundary layer RH of 15-20%. With downslope winds of 15-25 mph, widespread elevated fire-weather conditions are likely on the lee slopes and through the gaps of the higher terrain. Some localized critical conditions are also possible where the terrain-enhanced winds and locally drier conditions may develop for a few hours this afternoon. ...Great Basin and northern Rockies Dry Thunder... East of the upper low, widespread thunderstorm activity is expected across the Great Basin and western slopes of the Rockies. A monsoon surge of 0.8 to 1.0 inch PWATs will lift northward across central/eastern NV into UT and western CO/WY. Weak ascent from the trough, along with diurnal heating of the terrain will result in scattered to numerous high-based showers and thunderstorms by early afternoon. Additional storms are likely along a cold front across ID and western MT. Given the increasing moisture content and continued southerly flow, some wetting rainfall is expected from training rounds of thunderstorms. A mix of wet and dry thunderstorms will support potential lightning ignitions, particularly with fast moving cells and on the edges of the most intense downdraft cores. This appears most likely across parts of eastern UT and western CO where less wetting rainfall is expected. Though isolated dry strikes are possible over the entire IsoDryT area. ...Northern OR/Southern CA... Scattered thunderstorms are again expected ahead of the upper low. A few of these storms may be drier with 30+ kt of southerly flow and relatively deeply mixed boundary layers. While a few dry strikes are possible outside of the heavier cores, recent QPE estimates of 0.5 to 1 inches indicate area fuels have likely been tempered to some degree. This suggests the threat for dry lightning is below IsoDryT thresholds. ...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 1153 AM CDT Wed Jul 02 2025 Valid 021700Z - 031200Z ...Nevada... Anomalously high precipitable water values, including observed an observed value of nearly 1 inch from the 1200Z Las Vegas sounding, suggests higher precipitation efficiency from expected showers and thunderstorms moving into southern Nevada today. This will limit dry lightning ignition efficiency across southern Nevada. A relatively dry sub-cloud layer remains in place across central and northern Nevada, where initially high-based shower and thunderstorm development is expected through the day, increasing potential for ignition over dry fuels denoted by a general northward shift in Isolated Dry Thunderstorm highlights. ...Far Northeastern California into southeastern Oregon... Stronger mid-level winds and accelerated northeast thunderstorm motions owing to an encroaching mid-level trough into the Pacific Northwest will limit precipitation and increase ignition likelihood amid drier fuels across northeastern California into southeastern Oregon this afternoon. Isolated Dry Thunderstorm highlights were added to reflect this threat for today. ..Williams.. 07/02/2025 .PREV DISCUSSION... /ISSUED 0225 AM CDT Wed Jul 02 2025/ ...Synopsis... Mid-level troughing is forecast to slowly progress across central CA today, while another trough moves onshore across WA. Decreasing heights over the Northwest will continue to provide southerly transport of monsoon moisture into portions of the Great Basin and Intermountain West, where numerous thunderstorms are likely. Dry and breezy conditions will also be likely over the Cascades and western Columbia Basin. ...Lee of the Cascades... Increasing flow aloft ahead of the Pacific trough will favor dry downslope winds across the Cascades and western Columbia Basin. With daytime temperatures well into the 90s F, deep mixing will promote low boundary layer RH of 15-20%. With downslope winds of 15-25 mph, widespread elevated fire-weather conditions are likely on the lee slopes and through the gaps of the higher terrain. Some localized critical conditions are also possible where the terrain-enhanced winds and locally drier conditions may develop for a few hours this afternoon. ...Great Basin and northern Rockies Dry Thunder... East of the upper low, widespread thunderstorm activity is expected across the Great Basin and western slopes of the Rockies. A monsoon surge of 0.8 to 1.0 inch PWATs will lift northward across central/eastern NV into UT and western CO/WY. Weak ascent from the trough, along with diurnal heating of the terrain will result in scattered to numerous high-based showers and thunderstorms by early afternoon. Additional storms are likely along a cold front across ID and western MT. Given the increasing moisture content and continued southerly flow, some wetting rainfall is expected from training rounds of thunderstorms. A mix of wet and dry thunderstorms will support potential lightning ignitions, particularly with fast moving cells and on the edges of the most intense downdraft cores. This appears most likely across parts of eastern UT and western CO where less wetting rainfall is expected. Though isolated dry strikes are possible over the entire IsoDryT area. ...Northern OR/Southern CA... Scattered thunderstorms are again expected ahead of the upper low. A few of these storms may be drier with 30+ kt of southerly flow and relatively deeply mixed boundary layers. While a few dry strikes are possible outside of the heavier cores, recent QPE estimates of 0.5 to 1 inches indicate area fuels have likely been tempered to some degree. This suggests the threat for dry lightning is below IsoDryT thresholds. ...Please see www.spc.noaa.gov/fire for graphic product... Read more