Severe Storms

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0748 AM CDT Sat Aug 09 2025 Valid 091300Z - 101200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF THE UPPER GREAT LAKES/UPPER MIDWEST...AND EASTERN COLORADO INTO FAR WESTERN KANSAS... ...SUMMARY... Multiple severe/damaging wind swaths should occur today centered on parts of Iowa, northwest Illinois, Wisconsin, and the Upper Peninsula of Michigan. Large to very large hail will be possible across parts of eastern Colorado and vicinity this afternoon and evening. ...Upper Great Lakes/Upper Midwest into the Missouri Valley... A small but intense bowing cluster has produced numerous severe gusts/damage reports (some 75+ mph) in a narrow corridor early this morning across south-central NE to western IA. This convection should continue east-northeastward across parts of central/northern IA through the rest of the morning, with an enhanced southwesterly low-level jet providing ample moist inflow. A very unstable airmass remains in place ahead of a cold front across this area, with MUCAPE around 3000-3500 J/kg. This large reservoir of buoyancy should continue to support a severe/damaging wind threat with this cluster into parts of central/northern IA for at least the next few hours. See Mesoscale Discussion 1911 for more details on the short-term severe threat associated with this bowing complex. Additional thunderstorms have developed along/near the cold front across a broader portion of the Upper Great Lakes and Upper Midwest. It still appears probable that multiple swaths of severe/damaging winds may occur through the afternoon and evening across parts of these regions as the airmass ahead of these thunderstorms gradually destabilizes. With rich low-level moisture already in place, strong to extreme instability should once again develop by this afternoon. While stronger mid-level flow and related deep-layer shear will tend to lag the cold front, they should still be sufficient to support organized convection, mainly linear clusters. Some adjustments have been made to the Slight Risk to account for the ongoing severe thunderstorms in IA, as well as additional activity forecast to occur through the afternoon and evening. The potential for additional robust convective development tonight across parts of the MO Valley remains unclear as a southerly low-level jet strengthens once again. Regardless, have maintained severe probabilities across southeast NE and vicinity for this possibility. ...Central/Southern High Plains... A cold front should become nearly stationary by this afternoon across the south-central High Plains. A favorable low-level, post-frontal regime for severe convection is expected to develop across eastern CO by late afternoon. The presence of steep mid-level lapse rates, moderate instability, and favorable deep-layer shear will likely support scattered supercells capable of large to very large hail, localized severe gusts, and possibly a tornado or two mainly this afternoon into the evening. Across the southern High Plains, high-based convection may again develop across parts of eastern NM into the OK/TX Panhandles. This activity could pose a isolated threat for severe gusts given a very well-mixed boundary layer. ..Gleason/Leitman.. 08/09/2025 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0748 AM CDT Sat Aug 09 2025 Valid 091300Z - 101200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF THE UPPER GREAT LAKES/UPPER MIDWEST...AND EASTERN COLORADO INTO FAR WESTERN KANSAS... ...SUMMARY... Multiple severe/damaging wind swaths should occur today centered on parts of Iowa, northwest Illinois, Wisconsin, and the Upper Peninsula of Michigan. Large to very large hail will be possible across parts of eastern Colorado and vicinity this afternoon and evening. ...Upper Great Lakes/Upper Midwest into the Missouri Valley... A small but intense bowing cluster has produced numerous severe gusts/damage reports (some 75+ mph) in a narrow corridor early this morning across south-central NE to western IA. This convection should continue east-northeastward across parts of central/northern IA through the rest of the morning, with an enhanced southwesterly low-level jet providing ample moist inflow. A very unstable airmass remains in place ahead of a cold front across this area, with MUCAPE around 3000-3500 J/kg. This large reservoir of buoyancy should continue to support a severe/damaging wind threat with this cluster into parts of central/northern IA for at least the next few hours. See Mesoscale Discussion 1911 for more details on the short-term severe threat associated with this bowing complex. Additional thunderstorms have developed along/near the cold front across a broader portion of the Upper Great Lakes and Upper Midwest. It still appears probable that multiple swaths of severe/damaging winds may occur through the afternoon and evening across parts of these regions as the airmass ahead of these thunderstorms gradually destabilizes. With rich low-level moisture already in place, strong to extreme instability should once again develop by this afternoon. While stronger mid-level flow and related deep-layer shear will tend to lag the cold front, they should still be sufficient to support organized convection, mainly linear clusters. Some adjustments have been made to the Slight Risk to account for the ongoing severe thunderstorms in IA, as well as additional activity forecast to occur through the afternoon and evening. The potential for additional robust convective development tonight across parts of the MO Valley remains unclear as a southerly low-level jet strengthens once again. Regardless, have maintained severe probabilities across southeast NE and vicinity for this possibility. ...Central/Southern High Plains... A cold front should become nearly stationary by this afternoon across the south-central High Plains. A favorable low-level, post-frontal regime for severe convection is expected to develop across eastern CO by late afternoon. The presence of steep mid-level lapse rates, moderate instability, and favorable deep-layer shear will likely support scattered supercells capable of large to very large hail, localized severe gusts, and possibly a tornado or two mainly this afternoon into the evening. Across the southern High Plains, high-based convection may again develop across parts of eastern NM into the OK/TX Panhandles. This activity could pose a isolated threat for severe gusts given a very well-mixed boundary layer. ..Gleason/Leitman.. 08/09/2025 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0748 AM CDT Sat Aug 09 2025 Valid 091300Z - 101200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF THE UPPER GREAT LAKES/UPPER MIDWEST...AND EASTERN COLORADO INTO FAR WESTERN KANSAS... ...SUMMARY... Multiple severe/damaging wind swaths should occur today centered on parts of Iowa, northwest Illinois, Wisconsin, and the Upper Peninsula of Michigan. Large to very large hail will be possible across parts of eastern Colorado and vicinity this afternoon and evening. ...Upper Great Lakes/Upper Midwest into the Missouri Valley... A small but intense bowing cluster has produced numerous severe gusts/damage reports (some 75+ mph) in a narrow corridor early this morning across south-central NE to western IA. This convection should continue east-northeastward across parts of central/northern IA through the rest of the morning, with an enhanced southwesterly low-level jet providing ample moist inflow. A very unstable airmass remains in place ahead of a cold front across this area, with MUCAPE around 3000-3500 J/kg. This large reservoir of buoyancy should continue to support a severe/damaging wind threat with this cluster into parts of central/northern IA for at least the next few hours. See Mesoscale Discussion 1911 for more details on the short-term severe threat associated with this bowing complex. Additional thunderstorms have developed along/near the cold front across a broader portion of the Upper Great Lakes and Upper Midwest. It still appears probable that multiple swaths of severe/damaging winds may occur through the afternoon and evening across parts of these regions as the airmass ahead of these thunderstorms gradually destabilizes. With rich low-level moisture already in place, strong to extreme instability should once again develop by this afternoon. While stronger mid-level flow and related deep-layer shear will tend to lag the cold front, they should still be sufficient to support organized convection, mainly linear clusters. Some adjustments have been made to the Slight Risk to account for the ongoing severe thunderstorms in IA, as well as additional activity forecast to occur through the afternoon and evening. The potential for additional robust convective development tonight across parts of the MO Valley remains unclear as a southerly low-level jet strengthens once again. Regardless, have maintained severe probabilities across southeast NE and vicinity for this possibility. ...Central/Southern High Plains... A cold front should become nearly stationary by this afternoon across the south-central High Plains. A favorable low-level, post-frontal regime for severe convection is expected to develop across eastern CO by late afternoon. The presence of steep mid-level lapse rates, moderate instability, and favorable deep-layer shear will likely support scattered supercells capable of large to very large hail, localized severe gusts, and possibly a tornado or two mainly this afternoon into the evening. Across the southern High Plains, high-based convection may again develop across parts of eastern NM into the OK/TX Panhandles. This activity could pose a isolated threat for severe gusts given a very well-mixed boundary layer. ..Gleason/Leitman.. 08/09/2025 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0748 AM CDT Sat Aug 09 2025 Valid 091300Z - 101200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF THE UPPER GREAT LAKES/UPPER MIDWEST...AND EASTERN COLORADO INTO FAR WESTERN KANSAS... ...SUMMARY... Multiple severe/damaging wind swaths should occur today centered on parts of Iowa, northwest Illinois, Wisconsin, and the Upper Peninsula of Michigan. Large to very large hail will be possible across parts of eastern Colorado and vicinity this afternoon and evening. ...Upper Great Lakes/Upper Midwest into the Missouri Valley... A small but intense bowing cluster has produced numerous severe gusts/damage reports (some 75+ mph) in a narrow corridor early this morning across south-central NE to western IA. This convection should continue east-northeastward across parts of central/northern IA through the rest of the morning, with an enhanced southwesterly low-level jet providing ample moist inflow. A very unstable airmass remains in place ahead of a cold front across this area, with MUCAPE around 3000-3500 J/kg. This large reservoir of buoyancy should continue to support a severe/damaging wind threat with this cluster into parts of central/northern IA for at least the next few hours. See Mesoscale Discussion 1911 for more details on the short-term severe threat associated with this bowing complex. Additional thunderstorms have developed along/near the cold front across a broader portion of the Upper Great Lakes and Upper Midwest. It still appears probable that multiple swaths of severe/damaging winds may occur through the afternoon and evening across parts of these regions as the airmass ahead of these thunderstorms gradually destabilizes. With rich low-level moisture already in place, strong to extreme instability should once again develop by this afternoon. While stronger mid-level flow and related deep-layer shear will tend to lag the cold front, they should still be sufficient to support organized convection, mainly linear clusters. Some adjustments have been made to the Slight Risk to account for the ongoing severe thunderstorms in IA, as well as additional activity forecast to occur through the afternoon and evening. The potential for additional robust convective development tonight across parts of the MO Valley remains unclear as a southerly low-level jet strengthens once again. Regardless, have maintained severe probabilities across southeast NE and vicinity for this possibility. ...Central/Southern High Plains... A cold front should become nearly stationary by this afternoon across the south-central High Plains. A favorable low-level, post-frontal regime for severe convection is expected to develop across eastern CO by late afternoon. The presence of steep mid-level lapse rates, moderate instability, and favorable deep-layer shear will likely support scattered supercells capable of large to very large hail, localized severe gusts, and possibly a tornado or two mainly this afternoon into the evening. Across the southern High Plains, high-based convection may again develop across parts of eastern NM into the OK/TX Panhandles. This activity could pose a isolated threat for severe gusts given a very well-mixed boundary layer. ..Gleason/Leitman.. 08/09/2025 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0748 AM CDT Sat Aug 09 2025 Valid 091300Z - 101200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF THE UPPER GREAT LAKES/UPPER MIDWEST...AND EASTERN COLORADO INTO FAR WESTERN KANSAS... ...SUMMARY... Multiple severe/damaging wind swaths should occur today centered on parts of Iowa, northwest Illinois, Wisconsin, and the Upper Peninsula of Michigan. Large to very large hail will be possible across parts of eastern Colorado and vicinity this afternoon and evening. ...Upper Great Lakes/Upper Midwest into the Missouri Valley... A small but intense bowing cluster has produced numerous severe gusts/damage reports (some 75+ mph) in a narrow corridor early this morning across south-central NE to western IA. This convection should continue east-northeastward across parts of central/northern IA through the rest of the morning, with an enhanced southwesterly low-level jet providing ample moist inflow. A very unstable airmass remains in place ahead of a cold front across this area, with MUCAPE around 3000-3500 J/kg. This large reservoir of buoyancy should continue to support a severe/damaging wind threat with this cluster into parts of central/northern IA for at least the next few hours. See Mesoscale Discussion 1911 for more details on the short-term severe threat associated with this bowing complex. Additional thunderstorms have developed along/near the cold front across a broader portion of the Upper Great Lakes and Upper Midwest. It still appears probable that multiple swaths of severe/damaging winds may occur through the afternoon and evening across parts of these regions as the airmass ahead of these thunderstorms gradually destabilizes. With rich low-level moisture already in place, strong to extreme instability should once again develop by this afternoon. While stronger mid-level flow and related deep-layer shear will tend to lag the cold front, they should still be sufficient to support organized convection, mainly linear clusters. Some adjustments have been made to the Slight Risk to account for the ongoing severe thunderstorms in IA, as well as additional activity forecast to occur through the afternoon and evening. The potential for additional robust convective development tonight across parts of the MO Valley remains unclear as a southerly low-level jet strengthens once again. Regardless, have maintained severe probabilities across southeast NE and vicinity for this possibility. ...Central/Southern High Plains... A cold front should become nearly stationary by this afternoon across the south-central High Plains. A favorable low-level, post-frontal regime for severe convection is expected to develop across eastern CO by late afternoon. The presence of steep mid-level lapse rates, moderate instability, and favorable deep-layer shear will likely support scattered supercells capable of large to very large hail, localized severe gusts, and possibly a tornado or two mainly this afternoon into the evening. Across the southern High Plains, high-based convection may again develop across parts of eastern NM into the OK/TX Panhandles. This activity could pose a isolated threat for severe gusts given a very well-mixed boundary layer. ..Gleason/Leitman.. 08/09/2025 Read more

SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0748 AM CDT Sat Aug 09 2025 Valid 091300Z - 101200Z ...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF THE UPPER GREAT LAKES/UPPER MIDWEST...AND EASTERN COLORADO INTO FAR WESTERN KANSAS... ...SUMMARY... Multiple severe/damaging wind swaths should occur today centered on parts of Iowa, northwest Illinois, Wisconsin, and the Upper Peninsula of Michigan. Large to very large hail will be possible across parts of eastern Colorado and vicinity this afternoon and evening. ...Upper Great Lakes/Upper Midwest into the Missouri Valley... A small but intense bowing cluster has produced numerous severe gusts/damage reports (some 75+ mph) in a narrow corridor early this morning across south-central NE to western IA. This convection should continue east-northeastward across parts of central/northern IA through the rest of the morning, with an enhanced southwesterly low-level jet providing ample moist inflow. A very unstable airmass remains in place ahead of a cold front across this area, with MUCAPE around 3000-3500 J/kg. This large reservoir of buoyancy should continue to support a severe/damaging wind threat with this cluster into parts of central/northern IA for at least the next few hours. See Mesoscale Discussion 1911 for more details on the short-term severe threat associated with this bowing complex. Additional thunderstorms have developed along/near the cold front across a broader portion of the Upper Great Lakes and Upper Midwest. It still appears probable that multiple swaths of severe/damaging winds may occur through the afternoon and evening across parts of these regions as the airmass ahead of these thunderstorms gradually destabilizes. With rich low-level moisture already in place, strong to extreme instability should once again develop by this afternoon. While stronger mid-level flow and related deep-layer shear will tend to lag the cold front, they should still be sufficient to support organized convection, mainly linear clusters. Some adjustments have been made to the Slight Risk to account for the ongoing severe thunderstorms in IA, as well as additional activity forecast to occur through the afternoon and evening. The potential for additional robust convective development tonight across parts of the MO Valley remains unclear as a southerly low-level jet strengthens once again. Regardless, have maintained severe probabilities across southeast NE and vicinity for this possibility. ...Central/Southern High Plains... A cold front should become nearly stationary by this afternoon across the south-central High Plains. A favorable low-level, post-frontal regime for severe convection is expected to develop across eastern CO by late afternoon. The presence of steep mid-level lapse rates, moderate instability, and favorable deep-layer shear will likely support scattered supercells capable of large to very large hail, localized severe gusts, and possibly a tornado or two mainly this afternoon into the evening. Across the southern High Plains, high-based convection may again develop across parts of eastern NM into the OK/TX Panhandles. This activity could pose a isolated threat for severe gusts given a very well-mixed boundary layer. ..Gleason/Leitman.. 08/09/2025 Read more

MD 1910 CONCERNING SEVERE POTENTIAL...WATCH POSSIBLE FOR CENTRAL IOWA
Mesoscale Discussion 1910 NWS Storm Prediction Center Norman OK 0531 AM CDT Sat Aug 09 2025 Areas affected...central Iowa Concerning...Severe potential...Watch possible Valid 091031Z - 091200Z Probability of Watch Issuance...60 percent SUMMARY...Thunderstorms may increase in coverage ahead of a surface front through the morning hours. Damaging winds and isolated large hail will be possible. DISCUSSION...An intense hybrid supercell/small bow over southeast NE will continue to track east/northeast this morning ahead of a southeastward sagging surface cold front. If this convection is maintained, it will move into portions of western/central IA in the next couple of hours. Additional strong storms are also ongoing across parts of northwest IA and should gradually shift northeast toward north-central IA. A very moist airmass beneath steep midlevel lapse rates is supporting a corridor of strong instability ahead of the surface front. Effective shear magnitudes will increase through the morning, aiding in continued storm organization. While this convection will be moving into the region during a climatologically unfavorable time of day, widespread severe gusts have been noted with the ongoing storm across southeast NE over the past couple of hours, likely in part due to the large reservoir of instability in place. A new watch downstream from WW 579 may be needed in the next hour if current trends upstream continue. ..Leitman.. 08/09/2025 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...DMX...FSD...OAX... LAT...LON 41119483 41109528 41389561 41869576 42719509 43449422 43429348 42969311 42219311 41579326 41259398 41119483 MOST PROBABLE PEAK WIND GUST...65-80 MPH MOST PROBABLE PEAK HAIL SIZE...1.50-2.50 IN Read more

WW 0579 Status Updates
STATUS REPORT ON WW 579 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 ESE BIE TO 30 ENE OLU TO 25 NW DNS. ..LEITMAN..08/09/25 ATTN...WFO...OAX...GID... STATUS REPORT FOR WS 579 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS IAC085-129-133-155-165-091240- IA . IOWA COUNTIES INCLUDED ARE HARRISON MILLS MONONA POTTAWATTAMIE SHELBY NEC021-025-055-097-131-153-155-177-091240- NE . NEBRASKA COUNTIES INCLUDED ARE BURT CASS DOUGLAS JOHNSON OTOE SARPY SAUNDERS WASHINGTON 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 0579 Status Updates
STATUS REPORT ON WW 579 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 ESE BIE TO 30 ENE OLU TO 25 NW DNS. ..LEITMAN..08/09/25 ATTN...WFO...OAX...GID... STATUS REPORT FOR WS 579 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS IAC085-129-133-155-165-091240- IA . IOWA COUNTIES INCLUDED ARE HARRISON MILLS MONONA POTTAWATTAMIE SHELBY NEC021-025-055-097-131-153-155-177-091240- NE . NEBRASKA COUNTIES INCLUDED ARE BURT CASS DOUGLAS JOHNSON OTOE SARPY SAUNDERS WASHINGTON 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 0579 Status Updates
STATUS REPORT ON WW 579 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 ESE BIE TO 30 ENE OLU TO 25 NW DNS. ..LEITMAN..08/09/25 ATTN...WFO...OAX...GID... STATUS REPORT FOR WS 579 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS IAC085-129-133-155-165-091240- IA . IOWA COUNTIES INCLUDED ARE HARRISON MILLS MONONA POTTAWATTAMIE SHELBY NEC021-025-055-097-131-153-155-177-091240- NE . NEBRASKA COUNTIES INCLUDED ARE BURT CASS DOUGLAS JOHNSON OTOE SARPY SAUNDERS WASHINGTON 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 0579 Status Updates
STATUS REPORT ON WW 579 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 ESE BIE TO 30 ENE OLU TO 25 NW DNS. ..LEITMAN..08/09/25 ATTN...WFO...OAX...GID... STATUS REPORT FOR WS 579 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS IAC085-129-133-155-165-091240- IA . IOWA COUNTIES INCLUDED ARE HARRISON MILLS MONONA POTTAWATTAMIE SHELBY NEC021-025-055-097-131-153-155-177-091240- NE . NEBRASKA COUNTIES INCLUDED ARE BURT CASS DOUGLAS JOHNSON OTOE SARPY SAUNDERS WASHINGTON 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 0579 Status Updates
STATUS REPORT ON WW 579 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 ESE BIE TO 30 ENE OLU TO 25 NW DNS. ..LEITMAN..08/09/25 ATTN...WFO...OAX...GID... STATUS REPORT FOR WS 579 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS IAC085-129-133-155-165-091240- IA . IOWA COUNTIES INCLUDED ARE HARRISON MILLS MONONA POTTAWATTAMIE SHELBY NEC021-025-055-097-131-153-155-177-091240- NE . NEBRASKA COUNTIES INCLUDED ARE BURT CASS DOUGLAS JOHNSON OTOE SARPY SAUNDERS WASHINGTON 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 579 SEVERE TSTM IA NE 090720Z - 091300Z
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 579 NWS Storm Prediction Center Norman OK 220 AM CDT Sat Aug 9 2025 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Western Iowa South-Central into Eastern Nebraska * Effective this Saturday morning from 220 AM until 800 AM CDT. * Primary threats include... Scattered damaging winds and isolated significant gusts to 75 mph possible Isolated large hail events to 1.5 inches in diameter possible SUMMARY...A small bowing complex of thunderstorms may pose a threat for mainly scattered severe/damaging winds as it tracks northeastward through the early morning hours. Peak gusts may reach up to 65-75 mph on an isolated basis, and occasional severe hail may also occur. The severe thunderstorm watch area is approximately along and 45 statute miles north and south of a line from 15 miles southwest of Kearney NE to 25 miles northeast of Omaha NE. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU9). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Severe Thunderstorm Watch means conditions are favorable for severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. Severe thunderstorms can and occasionally do produce tornadoes. && OTHER WATCH INFORMATION...CONTINUE...WW 578... AVIATION...A few severe thunderstorms with hail surface and aloft to 1.5 inches. Extreme turbulence and surface wind gusts to 65 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 25035. ...Gleason Read more

WW 0580 Status Updates
STATUS FOR WATCH 0580 HAS NOT BEEN ISSUED YET Read more

WW 0580 Status Updates
STATUS FOR WATCH 0580 HAS NOT BEEN ISSUED YET Read more

WW 0580 Status Updates
STATUS FOR WATCH 0580 HAS NOT BEEN ISSUED YET Read more

MD 1909 CONCERNING SEVERE THUNDERSTORM WATCH 579... FOR PORTIONS OF EASTERN NE AND FAR SOUTHWEST IA
Mesoscale Discussion 1909 NWS Storm Prediction Center Norman OK 0428 AM CDT Sat Aug 09 2025 Areas affected...portions of eastern NE and far southwest IA Concerning...Severe Thunderstorm Watch 579... Valid 090928Z - 091100Z The severe weather threat for Severe Thunderstorm Watch 579 continues. SUMMARY...A risk for potentially significant wind gusts will accompany an intense supercell as it tracks east/northeast toward the NE/IA border over the next couple of hours. DISCUSSION...A hybrid supercell/small bow has been producing severe/damaging gusts over the past 1-2 hours across southeast NE. Radar presentation shows very strong outbound velocities aloft coincident with damage reports, and most recently a 91 mph measured gust in Fillmore County. This activity is occurring in a strongly unstable airmass, with MUCAPE near 4000 J/kg in a corridor ahead of a southeastward-sagging cold front. Convection will likely persist at least another couple of hours, and given the favorable downstream thermodynamic environment, severe gusts, some greater than 75 mph, are expected to continue as the storm approaches the Missouri River vicinity by 11z. ..Leitman.. 08/09/2025 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...OAX...GID... LAT...LON 40689811 41169785 41439747 41559703 41589618 41559586 41449568 41219557 40729574 40439614 40339738 40289790 40529810 40689811 MOST PROBABLE PEAK WIND GUST...75-90 MPH MOST PROBABLE PEAK HAIL SIZE...1.50-2.50 IN Read more

WW 0579 Status Updates
STATUS REPORT ON WW 579 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 W BIE TO 15 S OLU TO 25 SW SUX. ..LEITMAN..08/09/25 ATTN...WFO...OAX...GID... STATUS REPORT FOR WS 579 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS IAC085-129-133-155-165-091140- IA . IOWA COUNTIES INCLUDED ARE HARRISON MILLS MONONA POTTAWATTAMIE SHELBY NEC021-023-025-037-039-053-055-067-095-097-109-131-151-153-155- 159-177-091140- NE . NEBRASKA COUNTIES INCLUDED ARE BURT BUTLER CASS COLFAX CUMING DODGE DOUGLAS GAGE JEFFERSON JOHNSON LANCASTER OTOE SALINE SARPY SAUNDERS SEWARD WASHINGTON THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL Read more

WW 0579 Status Updates
STATUS REPORT ON WW 579 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 45 SSW HSI TO 15 SW GRI TO 35 WNW OLU. ..LEITMAN..08/09/25 ATTN...WFO...OAX...GID... STATUS REPORT FOR WS 579 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS IAC085-129-133-155-165-090940- IA . IOWA COUNTIES INCLUDED ARE HARRISON MILLS MONONA POTTAWATTAMIE SHELBY NEC001-021-023-025-035-037-039-053-055-059-081-109-121-125-129- 141-143-151-153-155-159-167-169-177-181-185-090940- NE . NEBRASKA COUNTIES INCLUDED ARE ADAMS BURT BUTLER CASS CLAY COLFAX CUMING DODGE DOUGLAS FILLMORE HAMILTON LANCASTER MERRICK NANCE NUCKOLLS PLATTE POLK SALINE SARPY SAUNDERS SEWARD STANTON THAYER WASHINGTON WEBSTER YORK Read more

WW 0579 Status Updates
STATUS REPORT ON WW 579 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 45 SSW HSI TO 15 SW GRI TO 35 WNW OLU. ..LEITMAN..08/09/25 ATTN...WFO...OAX...GID... STATUS REPORT FOR WS 579 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS IAC085-129-133-155-165-090940- IA . IOWA COUNTIES INCLUDED ARE HARRISON MILLS MONONA POTTAWATTAMIE SHELBY NEC001-021-023-025-035-037-039-053-055-059-081-109-121-125-129- 141-143-151-153-155-159-167-169-177-181-185-090940- NE . NEBRASKA COUNTIES INCLUDED ARE ADAMS BURT BUTLER CASS CLAY COLFAX CUMING DODGE DOUGLAS FILLMORE HAMILTON LANCASTER MERRICK NANCE NUCKOLLS PLATTE POLK SALINE SARPY SAUNDERS SEWARD STANTON THAYER WASHINGTON WEBSTER YORK Read more