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WW 0569 Status Updates
STATUS REPORT ON WW 569 THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1702 ..DEAN..08/11/19 ATTN...WFO...TFX...BYZ... STATUS REPORT FOR WS 569 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC001-007-027-031-043-045-057-059-067-097-107-112140- MT . MONTANA COUNTIES INCLUDED ARE BEAVERHEAD BROADWATER FERGUS GALLATIN JEFFERSON JUDITH BASIN MADISON MEAGHER PARK SWEET GRASS WHEATLAND THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 0572 Status Updates
STATUS FOR WATCH 0572 HAS NOT BEEN ISSUED YET Read more

MD 1702 CONCERNING SEVERE THUNDERSTORM WATCH 569... FOR SOUTHWEST INTO CENTRAL MT
Mesoscale Discussion 1702 NWS Storm Prediction Center Norman OK 0343 PM CDT Sun Aug 11 2019 Areas affected...Southwest into central MT Concerning...Severe Thunderstorm Watch 569... Valid 112043Z - 112215Z The severe weather threat for Severe Thunderstorm Watch 569 continues. SUMMARY...The threat for primarily large hail and severe wind gusts will continue through the remainder of the afternoon and spread northeast into the remainder of WW 569, with some areas seeing multiple rounds of storms. DISCUSSION...Several discrete storms are ongoing across southwest MT at 2030Z. MLCAPE of 750-1500 J/kg and effective shear of 35-45 kt will continue to support organized convection, including the potential for a few supercells. Large hail and locally severe wind gusts will the primary threat with any discrete cells through the afternoon, though a tornado cannot be ruled out with any stronger supercell, especially across the southeast portion of WW 569 where greater instability is in place. Large-scale ascent ahead of the ejecting upper trough to the west may eventually support some upscale growth, which would raise the potential for somewhat more widespread severe wind with time. Additional redevelopment within the next 1-2 hours also remains possible upstream of the ongoing activity in advance of the trough, which would result in another round of potentially severe convection for areas that have already experienced strong thunderstorms. ..Dean.. 08/11/2019 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...BYZ...TFX...MSO... LAT...LON 46041370 46271302 47171103 47750950 47570918 47010891 45920957 45191017 45081115 44721170 44671274 45121335 45731383 46041370 Read more

WW 0571 Status Updates
STATUS REPORT ON WW 571 THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. ..DEAN..08/11/19 ATTN...WFO...BYZ...UNR... STATUS REPORT FOR WT 571 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC003-009-011-017-025-037-065-075-087-095-103-111-112140- MT . MONTANA COUNTIES INCLUDED ARE BIG HORN CARBON CARTER CUSTER FALLON GOLDEN VALLEY MUSSELSHELL POWDER RIVER ROSEBUD STILLWATER TREASURE YELLOWSTONE SDC019-033-047-063-081-093-102-103-105-112140- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE BUTTE CUSTER FALL RIVER HARDING LAWRENCE MEADE OGLALA LAKOTA PENNINGTON PERKINS WYC005-011-033-045-112140- WY . WYOMING COUNTIES INCLUDED ARE Read more

WW 0570 Status Updates
STATUS REPORT ON WW 570 THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. ..GLEASON..08/11/19 ATTN...WFO...BOU...CYS... STATUS REPORT FOR WS 570 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS COC001-005-035-039-073-075-087-095-115-121-123-112140- CO . COLORADO COUNTIES INCLUDED ARE ADAMS ARAPAHOE DOUGLAS ELBERT LINCOLN LOGAN MORGAN PHILLIPS SEDGWICK WASHINGTON WELD NEC007-013-033-045-105-123-157-165-112140- NE . NEBRASKA COUNTIES INCLUDED ARE BANNER BOX BUTTE CHEYENNE DAWES KIMBALL MORRILL SCOTTS BLUFF SIOUX WYC009-015-021-027-031-112140- WY . WYOMING COUNTIES INCLUDED ARE Read more

MD 1701 CONCERNING SEVERE POTENTIAL...WATCH LIKELY FOR PORTIONS OF EAST-CENTRAL CO...NORTHWESTERN KS...AND SOUTHWESTERN NE
Mesoscale Discussion 1701 NWS Storm Prediction Center Norman OK 0320 PM CDT Sun Aug 11 2019 Areas affected...Portions of east-central CO...northwestern KS...and southwestern NE Concerning...Severe potential...Watch likely Valid 112020Z - 112145Z Probability of Watch Issuance...95 percent SUMMARY...Severe threat will likely increase this afternoon. A couple tornadoes, large hail, and scattered damaging winds will all be possible. Watch issuance is likely. DISCUSSION...Strong heating has occurred this afternoon on both sides of a surface boundary evident on visible satellite extending from northeastern CO into northwestern KS. Low-level convergence along this boundary should encourage additional storm development across this region over the next couple of hours. This process may already be starting in Washington County in northeastern CO based on latest radar and satellite trends. Although low-level flow is not very strong across western KS at the moment per KGLD VWP, southeasterly low-level winds are forecast to increase later this afternoon into the evening as a low-level jet strengthens. MLCAPE ranges from 2000-3000 J/kg per 20Z mesoanalysis estimates, with around 35-40 kt of effective bulk shear. Supercells may initially pose a large hail threat, and isolated tornadoes could occur mainly along and immediately to the north of the surface boundary where effective SRH will be relatively greater. A bowing complex capable of producing a swath of damaging winds appears increasingly possible later this evening as storms likely grow upscale into north-central KS and south-central NE in tandem with the strengthening low-level jet. ..Gleason/Grams.. 08/11/2019 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...GID...LBF...GLD... LAT...LON 39220281 40030273 40320253 40420203 40970195 41010110 40980022 40440001 40059993 39350001 39100020 38790061 38790223 39220281 Read more

WW 0571 Status Updates
STATUS FOR WATCH 0571 HAS NOT BEEN ISSUED YET Read more

SPC 2000Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0244 PM CDT Sun Aug 11 2019 Valid 112000Z - 121200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS SOUTHERN NE...NORTHERN KS...NORTHEAST CO...AND EAST-CENTRAL MT... ...SUMMARY... Scattered to numerous severe thunderstorms are likely across portions of the northern and central Great Plains. A few tornadoes, damaging wind gusts, and large hail are possible, mainly through this evening. ...Discussion... No appreciable change was made to the previous outlook. ..Smith.. 08/11/2019 .PREV DISCUSSION... /ISSUED 1130 AM CDT Sun Aug 11 2019/ ...Central High Plains to Mid-MS Valley... A belt of somewhat enhanced mid-level flow extends from the southern Rockies to the Lower MO Valley around the anticyclone centered near the Red River. Within this belt, an MCV from a remnant overnight MCS is sliding eastward near the IA/MO border. Some surface-based storm development is possible near this MCV along the leading edge of the residual cold pool and perhaps in the wake of the ongoing stratiform if modest boundary-layer heating can occur. Weak mid-level lapse rates and generally modest effective shear suggests the threat for damaging winds should be localized. Farther west, a low-level upslope regime has become established north of the remnant outflow/effective front that is draped near the I-70 corridor. Recovery of low-level moisture and surface heating will yield large buoyancy north of the front with MLCAPE likely reaching 2500-3500 J/kg by late afternoon. Thunderstorm development is expected first immediately east of the Front Range in CO, while the boundary layer should remain capped through much of the afternoon in far northeast CO vicinity. Buoyancy and deep-layer vertical shear will be sufficient for a mix of supercells and multicell clusters with large hail/severe gusts possible with the initial deep convection east of the Front Range. Wind profiles will be more favorable for supercells farther east on the High Plains where low-level easterly flow and hodograph curvature will be greater, though there will be a tendency for cell interactions and upscale growth later into the evening. Any semi-discrete supercells will pose a threat for a couple of tornadoes and large hail, while the severe wind threat will increase with storm clustering into the evening. These clusters should form into a forward-propagating MCS that may develop into a longer-lived bow along the KS/NE border region tonight. Weak low-level lapse rates should be a limiting factor, but the reservoir of large buoyancy along the nose of the low-level jet lends credence to the possibility of a swath of severe wind gusts into the early overnight. ...Northern High Plains... A shortwave trough will eject from western ID to eastern MT. Easterly low-level flow will be maintained ahead of this trough and its associated cold front that will push east across MT. This flow regime will maintain a broad plume of mid 50s to mid 60s surface dew points from west to east. Rather steep mid-level lapse rates of 8-9 C/km across WY/eastern MT will contribute to a corridor of MLCAPE reaching 2000-3000 J/kg where greater surface heating is underway across southeast MT/northeast WY/western SD. Episodic thunderstorm initiation is expected during the next few hours over the high terrain of southwest MT and downstream of a leading lobe of ascent approaching the WY/MT/Dakota border region, as well as by late afternoon in an arc off the higher terrain of WY. Effective bulk shear of 35-50 kt will favor several supercells initially with large hail and a couple of tornadoes. Convection is expected to grow upscale into multiple clusters/line segments across MT into the western Dakotas with an increasing threat of severe winds. The most likely corridor for a swath of severe gusts is across parts of east-central MT along the northern periphery of the buoyancy plume where large-scale ascent should be greatest ahead of the shortwave trough. Read more

SPC 2000Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0244 PM CDT Sun Aug 11 2019 Valid 112000Z - 121200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS SOUTHERN NE...NORTHERN KS...NORTHEAST CO...AND EAST-CENTRAL MT... ...SUMMARY... Scattered to numerous severe thunderstorms are likely across portions of the northern and central Great Plains. A few tornadoes, damaging wind gusts, and large hail are possible, mainly through this evening. ...Discussion... No appreciable change was made to the previous outlook. ..Smith.. 08/11/2019 .PREV DISCUSSION... /ISSUED 1130 AM CDT Sun Aug 11 2019/ ...Central High Plains to Mid-MS Valley... A belt of somewhat enhanced mid-level flow extends from the southern Rockies to the Lower MO Valley around the anticyclone centered near the Red River. Within this belt, an MCV from a remnant overnight MCS is sliding eastward near the IA/MO border. Some surface-based storm development is possible near this MCV along the leading edge of the residual cold pool and perhaps in the wake of the ongoing stratiform if modest boundary-layer heating can occur. Weak mid-level lapse rates and generally modest effective shear suggests the threat for damaging winds should be localized. Farther west, a low-level upslope regime has become established north of the remnant outflow/effective front that is draped near the I-70 corridor. Recovery of low-level moisture and surface heating will yield large buoyancy north of the front with MLCAPE likely reaching 2500-3500 J/kg by late afternoon. Thunderstorm development is expected first immediately east of the Front Range in CO, while the boundary layer should remain capped through much of the afternoon in far northeast CO vicinity. Buoyancy and deep-layer vertical shear will be sufficient for a mix of supercells and multicell clusters with large hail/severe gusts possible with the initial deep convection east of the Front Range. Wind profiles will be more favorable for supercells farther east on the High Plains where low-level easterly flow and hodograph curvature will be greater, though there will be a tendency for cell interactions and upscale growth later into the evening. Any semi-discrete supercells will pose a threat for a couple of tornadoes and large hail, while the severe wind threat will increase with storm clustering into the evening. These clusters should form into a forward-propagating MCS that may develop into a longer-lived bow along the KS/NE border region tonight. Weak low-level lapse rates should be a limiting factor, but the reservoir of large buoyancy along the nose of the low-level jet lends credence to the possibility of a swath of severe wind gusts into the early overnight. ...Northern High Plains... A shortwave trough will eject from western ID to eastern MT. Easterly low-level flow will be maintained ahead of this trough and its associated cold front that will push east across MT. This flow regime will maintain a broad plume of mid 50s to mid 60s surface dew points from west to east. Rather steep mid-level lapse rates of 8-9 C/km across WY/eastern MT will contribute to a corridor of MLCAPE reaching 2000-3000 J/kg where greater surface heating is underway across southeast MT/northeast WY/western SD. Episodic thunderstorm initiation is expected during the next few hours over the high terrain of southwest MT and downstream of a leading lobe of ascent approaching the WY/MT/Dakota border region, as well as by late afternoon in an arc off the higher terrain of WY. Effective bulk shear of 35-50 kt will favor several supercells initially with large hail and a couple of tornadoes. Convection is expected to grow upscale into multiple clusters/line segments across MT into the western Dakotas with an increasing threat of severe winds. The most likely corridor for a swath of severe gusts is across parts of east-central MT along the northern periphery of the buoyancy plume where large-scale ascent should be greatest ahead of the shortwave trough. Read more

SPC 2000Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0244 PM CDT Sun Aug 11 2019 Valid 112000Z - 121200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS SOUTHERN NE...NORTHERN KS...NORTHEAST CO...AND EAST-CENTRAL MT... ...SUMMARY... Scattered to numerous severe thunderstorms are likely across portions of the northern and central Great Plains. A few tornadoes, damaging wind gusts, and large hail are possible, mainly through this evening. ...Discussion... No appreciable change was made to the previous outlook. ..Smith.. 08/11/2019 .PREV DISCUSSION... /ISSUED 1130 AM CDT Sun Aug 11 2019/ ...Central High Plains to Mid-MS Valley... A belt of somewhat enhanced mid-level flow extends from the southern Rockies to the Lower MO Valley around the anticyclone centered near the Red River. Within this belt, an MCV from a remnant overnight MCS is sliding eastward near the IA/MO border. Some surface-based storm development is possible near this MCV along the leading edge of the residual cold pool and perhaps in the wake of the ongoing stratiform if modest boundary-layer heating can occur. Weak mid-level lapse rates and generally modest effective shear suggests the threat for damaging winds should be localized. Farther west, a low-level upslope regime has become established north of the remnant outflow/effective front that is draped near the I-70 corridor. Recovery of low-level moisture and surface heating will yield large buoyancy north of the front with MLCAPE likely reaching 2500-3500 J/kg by late afternoon. Thunderstorm development is expected first immediately east of the Front Range in CO, while the boundary layer should remain capped through much of the afternoon in far northeast CO vicinity. Buoyancy and deep-layer vertical shear will be sufficient for a mix of supercells and multicell clusters with large hail/severe gusts possible with the initial deep convection east of the Front Range. Wind profiles will be more favorable for supercells farther east on the High Plains where low-level easterly flow and hodograph curvature will be greater, though there will be a tendency for cell interactions and upscale growth later into the evening. Any semi-discrete supercells will pose a threat for a couple of tornadoes and large hail, while the severe wind threat will increase with storm clustering into the evening. These clusters should form into a forward-propagating MCS that may develop into a longer-lived bow along the KS/NE border region tonight. Weak low-level lapse rates should be a limiting factor, but the reservoir of large buoyancy along the nose of the low-level jet lends credence to the possibility of a swath of severe wind gusts into the early overnight. ...Northern High Plains... A shortwave trough will eject from western ID to eastern MT. Easterly low-level flow will be maintained ahead of this trough and its associated cold front that will push east across MT. This flow regime will maintain a broad plume of mid 50s to mid 60s surface dew points from west to east. Rather steep mid-level lapse rates of 8-9 C/km across WY/eastern MT will contribute to a corridor of MLCAPE reaching 2000-3000 J/kg where greater surface heating is underway across southeast MT/northeast WY/western SD. Episodic thunderstorm initiation is expected during the next few hours over the high terrain of southwest MT and downstream of a leading lobe of ascent approaching the WY/MT/Dakota border region, as well as by late afternoon in an arc off the higher terrain of WY. Effective bulk shear of 35-50 kt will favor several supercells initially with large hail and a couple of tornadoes. Convection is expected to grow upscale into multiple clusters/line segments across MT into the western Dakotas with an increasing threat of severe winds. The most likely corridor for a swath of severe gusts is across parts of east-central MT along the northern periphery of the buoyancy plume where large-scale ascent should be greatest ahead of the shortwave trough. Read more

SPC 2000Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0244 PM CDT Sun Aug 11 2019 Valid 112000Z - 121200Z ...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS SOUTHERN NE...NORTHERN KS...NORTHEAST CO...AND EAST-CENTRAL MT... ...SUMMARY... Scattered to numerous severe thunderstorms are likely across portions of the northern and central Great Plains. A few tornadoes, damaging wind gusts, and large hail are possible, mainly through this evening. ...Discussion... No appreciable change was made to the previous outlook. ..Smith.. 08/11/2019 .PREV DISCUSSION... /ISSUED 1130 AM CDT Sun Aug 11 2019/ ...Central High Plains to Mid-MS Valley... A belt of somewhat enhanced mid-level flow extends from the southern Rockies to the Lower MO Valley around the anticyclone centered near the Red River. Within this belt, an MCV from a remnant overnight MCS is sliding eastward near the IA/MO border. Some surface-based storm development is possible near this MCV along the leading edge of the residual cold pool and perhaps in the wake of the ongoing stratiform if modest boundary-layer heating can occur. Weak mid-level lapse rates and generally modest effective shear suggests the threat for damaging winds should be localized. Farther west, a low-level upslope regime has become established north of the remnant outflow/effective front that is draped near the I-70 corridor. Recovery of low-level moisture and surface heating will yield large buoyancy north of the front with MLCAPE likely reaching 2500-3500 J/kg by late afternoon. Thunderstorm development is expected first immediately east of the Front Range in CO, while the boundary layer should remain capped through much of the afternoon in far northeast CO vicinity. Buoyancy and deep-layer vertical shear will be sufficient for a mix of supercells and multicell clusters with large hail/severe gusts possible with the initial deep convection east of the Front Range. Wind profiles will be more favorable for supercells farther east on the High Plains where low-level easterly flow and hodograph curvature will be greater, though there will be a tendency for cell interactions and upscale growth later into the evening. Any semi-discrete supercells will pose a threat for a couple of tornadoes and large hail, while the severe wind threat will increase with storm clustering into the evening. These clusters should form into a forward-propagating MCS that may develop into a longer-lived bow along the KS/NE border region tonight. Weak low-level lapse rates should be a limiting factor, but the reservoir of large buoyancy along the nose of the low-level jet lends credence to the possibility of a swath of severe wind gusts into the early overnight. ...Northern High Plains... A shortwave trough will eject from western ID to eastern MT. Easterly low-level flow will be maintained ahead of this trough and its associated cold front that will push east across MT. This flow regime will maintain a broad plume of mid 50s to mid 60s surface dew points from west to east. Rather steep mid-level lapse rates of 8-9 C/km across WY/eastern MT will contribute to a corridor of MLCAPE reaching 2000-3000 J/kg where greater surface heating is underway across southeast MT/northeast WY/western SD. Episodic thunderstorm initiation is expected during the next few hours over the high terrain of southwest MT and downstream of a leading lobe of ascent approaching the WY/MT/Dakota border region, as well as by late afternoon in an arc off the higher terrain of WY. Effective bulk shear of 35-50 kt will favor several supercells initially with large hail and a couple of tornadoes. Convection is expected to grow upscale into multiple clusters/line segments across MT into the western Dakotas with an increasing threat of severe winds. The most likely corridor for a swath of severe gusts is across parts of east-central MT along the northern periphery of the buoyancy plume where large-scale ascent should be greatest ahead of the shortwave trough. Read more

WW 0569 Status Updates
STATUS REPORT ON WW 569 THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. ..DEAN..08/11/19 ATTN...WFO...TFX...BYZ... STATUS REPORT FOR WS 569 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS MTC001-007-027-031-043-045-057-059-067-097-107-112040- MT . MONTANA COUNTIES INCLUDED ARE BEAVERHEAD BROADWATER FERGUS GALLATIN JEFFERSON JUDITH BASIN MADISON MEAGHER PARK SWEET GRASS WHEATLAND THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

WW 0570 Status Updates
STATUS FOR WATCH 0570 HAS NOT BEEN ISSUED YET Read more

SPC Day 2 Fire Weather Outlook
Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0211 PM CDT Sun Aug 11 2019 Valid 121200Z - 131200Z ...NO CRITICAL AREAS... The previous forecast remains on track, with no changes made. Please see below for more details. ..Squitieri.. 08/11/2019 .PREV DISCUSSION... /ISSUED 1230 AM CDT Sun Aug 11 2019/ ...Synopsis... The northern Rockies mid-level trough responsible for heightened fire weather concerns the past few days will continue to weaken and lift northeastward toward the Plains/southern Canadian provinces. In the wake of this system, zonal mid-level flow will extend across the northern tier of the CONUS along with weaker mid-level flow compared to recent days. This pattern will translate to weaker low-level flow across dry areas of the West. Outside of locally elevated fire weather conditions across Wyoming and vicinity, the overall pattern will be quiet and no highlights are needed for this outlook. ...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 0211 PM CDT Sun Aug 11 2019 Valid 121200Z - 131200Z ...NO CRITICAL AREAS... The previous forecast remains on track, with no changes made. Please see below for more details. ..Squitieri.. 08/11/2019 .PREV DISCUSSION... /ISSUED 1230 AM CDT Sun Aug 11 2019/ ...Synopsis... The northern Rockies mid-level trough responsible for heightened fire weather concerns the past few days will continue to weaken and lift northeastward toward the Plains/southern Canadian provinces. In the wake of this system, zonal mid-level flow will extend across the northern tier of the CONUS along with weaker mid-level flow compared to recent days. This pattern will translate to weaker low-level flow across dry areas of the West. Outside of locally elevated fire weather conditions across Wyoming and vicinity, the overall pattern will be quiet and no highlights are needed for this outlook. ...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 0211 PM CDT Sun Aug 11 2019 Valid 121200Z - 131200Z ...NO CRITICAL AREAS... The previous forecast remains on track, with no changes made. Please see below for more details. ..Squitieri.. 08/11/2019 .PREV DISCUSSION... /ISSUED 1230 AM CDT Sun Aug 11 2019/ ...Synopsis... The northern Rockies mid-level trough responsible for heightened fire weather concerns the past few days will continue to weaken and lift northeastward toward the Plains/southern Canadian provinces. In the wake of this system, zonal mid-level flow will extend across the northern tier of the CONUS along with weaker mid-level flow compared to recent days. This pattern will translate to weaker low-level flow across dry areas of the West. Outside of locally elevated fire weather conditions across Wyoming and vicinity, the overall pattern will be quiet and no highlights are needed for this outlook. ...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 0211 PM CDT Sun Aug 11 2019 Valid 121200Z - 131200Z ...NO CRITICAL AREAS... The previous forecast remains on track, with no changes made. Please see below for more details. ..Squitieri.. 08/11/2019 .PREV DISCUSSION... /ISSUED 1230 AM CDT Sun Aug 11 2019/ ...Synopsis... The northern Rockies mid-level trough responsible for heightened fire weather concerns the past few days will continue to weaken and lift northeastward toward the Plains/southern Canadian provinces. In the wake of this system, zonal mid-level flow will extend across the northern tier of the CONUS along with weaker mid-level flow compared to recent days. This pattern will translate to weaker low-level flow across dry areas of the West. Outside of locally elevated fire weather conditions across Wyoming and vicinity, the overall pattern will be quiet and no highlights are needed for this outlook. ...Please see www.spc.noaa.gov/fire for graphic product... Read more

MD 1700 CONCERNING SEVERE POTENTIAL...WATCH LIKELY FOR PORTIONS OF SOUTHEASTERN WY...THE NE PANHANDLE...AND NORTHEASTERN CO
Mesoscale Discussion 1700 NWS Storm Prediction Center Norman OK 0154 PM CDT Sun Aug 11 2019 Areas affected...Portions of southeastern WY...the NE Panhandle...and northeastern CO Concerning...Severe potential...Watch likely Valid 111854Z - 112100Z Probability of Watch Issuance...80 percent SUMMARY...Severe threat is expected to increase this afternoon, with both large hail and damaging winds possible. A tornado or two may also occur. Watch issuance is likely by 21Z (3 PM MDT). DISCUSSION...With weak surface lows analyzed over east-central CO and southeastern WY, persistent easterly low-level upslope flow will continue to encourage gradual convective development along the Laramie Mountains and Front Range in southeastern WY/northeastern CO, respectively. In addition, at least modest large-scale ascent associated with an upper low over the northern Rockies will continue to overspread the central Rockies this afternoon and evening. Mid-level southwesterly winds are forecast to only modestly strengthen to 25-35 kt through the remainder of the day, but a strongly veering wind profile from the surface through mid levels noted in RAP forecast soundings will contribute to around 30-40 kt of effective bulk shear. Continued boundary-layer heating will erode remaining convective inhibition over the next couple of hours to the north of a remnant outflow boundary extending across northern KS into northeastern CO. The presence of low to mid 60s dewpoints across much of this region in combination with steepening mid-level lapse rates emanating from the central Rockies will promote MLCAPE of generally 2500-3500 J/kg by peak afternoon heating. The expected combination of strong instability with sufficient shear will likely support a mix of supercells/multicells initially. Large hail would probably be the main threat with this semi-discrete development, although a tornado or two could also occur near the surface boundary in northeastern CO where backed low-level flow will locally augment effective SRH. Eventual storm mergers/clustering should occur with eastward extent into the NE Panhandle and northeastern CO as a low-level jet strengthens by early evening. Damaging wind potential would likewise increase if this occurred. With severe potential expected to continue increasing this afternoon, watch issuance is likely by 21Z (3 PM MDT). ..Gleason/Grams.. 08/11/2019 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...LBF...GLD...BOU...CYS... LAT...LON 39320473 41240520 42950513 42960211 40800206 39640209 39120305 39120391 39320473 Read more

WW 0569 Status Updates
STATUS FOR WATCH 0569 HAS NOT BEEN ISSUED YET Read more

MD 1699 CONCERNING SEVERE POTENTIAL...WATCH LIKELY FOR SOUTHEAST MT...NORTHERN WY...NORTHWEST SD...SOUTHWEST ND
Mesoscale Discussion 1699 NWS Storm Prediction Center Norman OK 0115 PM CDT Sun Aug 11 2019 Areas affected...Southeast MT...Northern WY...Northwest SD...Southwest ND Concerning...Severe potential...Watch likely Valid 111815Z - 111945Z Probability of Watch Issuance...95 percent SUMMARY...Severe thunderstorm development is likely across some portion of the area this afternoon. Very large hail and severe wind gusts will be the primary hazards, though a tornado or two will also be possible. One or more watches are likely by 19-20Z. DISCUSSION...A strong thunderstorm has recently developed near Sheridan, WY, while a gradual intensification has been noted for embedded cells within an ongoing elevated cluster across southeast MT. Thunderstorms are expected to increase in coverage and intensity through the afternoon, as further destabilization occurs and a seasonably strong upper-level low/trough ejects across the northern Rockies. Evolution of the ongoing elevated cluster remains uncertain, but there is some potential for a transition to surface-based convection as the downstream airmass destabilizes into southwest ND/northwest SD. Meanwhile, additional thunderstorms are likely to develop across the higher terrain of northern/eastern WY later this afternoon. Moderate to locally strong buoyancy (MLCAPE 1500-3000 J/kg) is forecast to develop later this afternoon, as heating of a moist low-level environment occurs beneath steep midlevel lapse rates. Effective shear in the 35-45 kt range will favor supercell development with initial deep convection, with some cell mergers/upscale growth possible later in the convective evolution. Very large hail will the primary initial threat, along with isolated severe wind gusts. Any upscale growth later this afternoon would favor somewhat greater wind potential. A tornado or two will also be possible with any supercells, though relatively weak low-level flow may temper the tornado threat to some extent. Given the expected increase in the severe threat with time, one or more watches are likely across some portion of this region by 19-20Z. ..Dean/Grams.. 08/11/2019 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...BIS...UNR...BYZ...GGW...RIW... LAT...LON 46890656 46850435 46320328 45840290 44750289 44070323 43710360 43600416 43660480 43790536 43990621 44600786 44810922 45001013 46120828 46740690 46890656 Read more