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1 month ago
WW 0593 Status Updates
STATUS FOR WATCH 0593 HAS NOT BEEN ISSUED YET
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1 month ago
WW 0593 Status Updates
STATUS FOR WATCH 0593 HAS NOT BEEN ISSUED YET
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1 month ago
MD 1958 CONCERNING SEVERE THUNDERSTORM WATCH 591... FOR PORTIONS OF EASTERN MINNESOTA AND WESTERN WISCONSIN
Mesoscale Discussion 1958
NWS Storm Prediction Center Norman OK
0724 PM CDT Fri Aug 15 2025
Areas affected...portions of eastern Minnesota and western Wisconsin
Concerning...Severe Thunderstorm Watch 591...
Valid 160024Z - 160200Z
The severe weather threat for Severe Thunderstorm Watch 591
continues.
SUMMARY...Ongoing storms have begun to cluster this evening. This
trend is expected to continue, transitioning the primary threat
towards damaging gusts and sporadic hail.
DISCUSSION...Across WW 591, scattered strong to severe thunderstorms
are ongoing and expected to continue. The initially more cellular
storms have gradually coalesced into a more cluster/multicellular
mode over the last 2 hours. With that transition, damaging gusts
appear to be the primary threat as outflow continues to coalesce
along and south of the stalled frontal boundary through eastern MN
and western WI. While strong outflow should be the primary risk
through the remainder of the evening, moderate deep-layer shear and
buoyancy could still support sporadic hail potential with stronger
but more transient updrafts.
Observational and CAM trends suggest these storm will gradually move
east/southeast with some severe risk through this evening. The
southern extent and duration of the severe risk is somewhat
uncertain as a remnant cold pool from a prior cluster is present
near the IA/MN/WI border region. However, the environment should
remain broadly favorable for damaging gusts and occasional hail
focused on the eastern portions of WW591 for a couple more hours.
..Lyons.. 08/16/2025
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...GRB...ARX...MPX...
LAT...LON 45209374 45389289 45069100 44609038 44129020 43759050
43799130 43919205 44169294 44449338 44719369 45209374
MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 95 MPH
MOST PROBABLE PEAK WIND GUST...55-70 MPH
MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN
Read more
1 month ago
WW 0591 Status Updates
STATUS REPORT ON WW 591
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 ENE MKT
TO 40 NNW EAU.
..LYONS..08/16/25
ATTN...WFO...MPX...ARX...
STATUS REPORT FOR WS 591
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MNC049-131-157-160240-
MN
. MINNESOTA COUNTIES INCLUDED ARE
GOODHUE RICE WABASHA
WIC011-017-019-033-035-053-091-093-109-121-160240-
WI
. WISCONSIN COUNTIES INCLUDED ARE
BUFFALO CHIPPEWA CLARK
DUNN EAU CLAIRE JACKSON
PEPIN PIERCE ST. CROIX
TREMPEALEAU
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
1 month ago
WW 0591 Status Updates
STATUS REPORT ON WW 591
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 ENE MKT
TO 40 NNW EAU.
..LYONS..08/16/25
ATTN...WFO...MPX...ARX...
STATUS REPORT FOR WS 591
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MNC049-131-157-160240-
MN
. MINNESOTA COUNTIES INCLUDED ARE
GOODHUE RICE WABASHA
WIC011-017-019-033-035-053-091-093-109-121-160240-
WI
. WISCONSIN COUNTIES INCLUDED ARE
BUFFALO CHIPPEWA CLARK
DUNN EAU CLAIRE JACKSON
PEPIN PIERCE ST. CROIX
TREMPEALEAU
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
1 month ago
WW 0591 Status Updates
STATUS REPORT ON WW 591
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 ENE MKT
TO 40 NNW EAU.
..LYONS..08/16/25
ATTN...WFO...MPX...ARX...
STATUS REPORT FOR WS 591
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MNC049-131-157-160240-
MN
. MINNESOTA COUNTIES INCLUDED ARE
GOODHUE RICE WABASHA
WIC011-017-019-033-035-053-091-093-109-121-160240-
WI
. WISCONSIN COUNTIES INCLUDED ARE
BUFFALO CHIPPEWA CLARK
DUNN EAU CLAIRE JACKSON
PEPIN PIERCE ST. CROIX
TREMPEALEAU
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
1 month ago
WW 0591 Status Updates
STATUS REPORT ON WW 591
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 ENE MKT
TO 40 NNW EAU.
..LYONS..08/16/25
ATTN...WFO...MPX...ARX...
STATUS REPORT FOR WS 591
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MNC049-131-157-160240-
MN
. MINNESOTA COUNTIES INCLUDED ARE
GOODHUE RICE WABASHA
WIC011-017-019-033-035-053-091-093-109-121-160240-
WI
. WISCONSIN COUNTIES INCLUDED ARE
BUFFALO CHIPPEWA CLARK
DUNN EAU CLAIRE JACKSON
PEPIN PIERCE ST. CROIX
TREMPEALEAU
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
1 month ago
WW 0591 Status Updates
STATUS REPORT ON WW 591
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 ENE MKT
TO 40 NNW EAU.
..LYONS..08/16/25
ATTN...WFO...MPX...ARX...
STATUS REPORT FOR WS 591
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MNC049-131-157-160240-
MN
. MINNESOTA COUNTIES INCLUDED ARE
GOODHUE RICE WABASHA
WIC011-017-019-033-035-053-091-093-109-121-160240-
WI
. WISCONSIN COUNTIES INCLUDED ARE
BUFFALO CHIPPEWA CLARK
DUNN EAU CLAIRE JACKSON
PEPIN PIERCE ST. CROIX
TREMPEALEAU
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
1 month ago
WW 0591 Status Updates
STATUS REPORT ON WW 591
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 ENE MKT
TO 40 NNW EAU.
..LYONS..08/16/25
ATTN...WFO...MPX...ARX...
STATUS REPORT FOR WS 591
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MNC049-131-157-160240-
MN
. MINNESOTA COUNTIES INCLUDED ARE
GOODHUE RICE WABASHA
WIC011-017-019-033-035-053-091-093-109-121-160240-
WI
. WISCONSIN COUNTIES INCLUDED ARE
BUFFALO CHIPPEWA CLARK
DUNN EAU CLAIRE JACKSON
PEPIN PIERCE ST. CROIX
TREMPEALEAU
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
1 month ago
WW 591 SEVERE TSTM MN WI 152225Z - 160400Z
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 591
NWS Storm Prediction Center Norman OK
525 PM CDT Fri Aug 15 2025
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Southern Minnesota
Western Wisconsin
* Effective this Friday afternoon and evening from 525 PM until
1100 PM CDT.
* Primary threats include...
Scattered damaging wind gusts to 70 mph possible
Scattered large hail events to 1.5 inches in diameter possible
SUMMARY...Strong to severe thunderstorms will continue to develop
across the region through early evening. Hail will be possible, and
at least isolated damaging wind potential will exist, especially as
storms merge/organize as they progress east-southeastward.
The severe thunderstorm watch area is approximately along and 35
statute miles north and south of a line from 35 miles north of
Redwood Falls MN to 55 miles east southeast of Eau Claire WI. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU1).
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 590...
AVIATION...A few severe thunderstorms with hail surface and aloft to
1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
28025.
...Guyer
Read more
1 month ago
WW 0592 Status Updates
STATUS REPORT ON WW 592
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 40 E BRL TO
30 SSE RFD.
..LYONS..08/16/25
ATTN...WFO...DVN...ILX...LOT...
STATUS REPORT FOR WS 592
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC011-095-123-143-155-175-179-203-160240-
IL
. ILLINOIS COUNTIES INCLUDED ARE
BUREAU KNOX MARSHALL
PEORIA PUTNAM STARK
TAZEWELL WOODFORD
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
1 month ago
WW 0592 Status Updates
STATUS REPORT ON WW 592
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 40 E BRL TO
30 SSE RFD.
..LYONS..08/16/25
ATTN...WFO...DVN...ILX...LOT...
STATUS REPORT FOR WS 592
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC011-095-123-143-155-175-179-203-160240-
IL
. ILLINOIS COUNTIES INCLUDED ARE
BUREAU KNOX MARSHALL
PEORIA PUTNAM STARK
TAZEWELL WOODFORD
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
1 month ago
WW 0592 Status Updates
STATUS REPORT ON WW 592
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 40 E BRL TO
30 SSE RFD.
..LYONS..08/16/25
ATTN...WFO...DVN...ILX...LOT...
STATUS REPORT FOR WS 592
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC011-095-123-143-155-175-179-203-160240-
IL
. ILLINOIS COUNTIES INCLUDED ARE
BUREAU KNOX MARSHALL
PEORIA PUTNAM STARK
TAZEWELL WOODFORD
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
1 month ago
WW 0592 Status Updates
STATUS REPORT ON WW 592
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 40 E BRL TO
30 SSE RFD.
..LYONS..08/16/25
ATTN...WFO...DVN...ILX...LOT...
STATUS REPORT FOR WS 592
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC011-095-123-143-155-175-179-203-160240-
IL
. ILLINOIS COUNTIES INCLUDED ARE
BUREAU KNOX MARSHALL
PEORIA PUTNAM STARK
TAZEWELL WOODFORD
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
1 month ago
WW 0592 Status Updates
STATUS REPORT ON WW 592
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 40 E BRL TO
30 SSE RFD.
..LYONS..08/16/25
ATTN...WFO...DVN...ILX...LOT...
STATUS REPORT FOR WS 592
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC011-095-123-143-155-175-179-203-160240-
IL
. ILLINOIS COUNTIES INCLUDED ARE
BUREAU KNOX MARSHALL
PEORIA PUTNAM STARK
TAZEWELL WOODFORD
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
1 month ago
WW 0592 Status Updates
STATUS REPORT ON WW 592
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 40 E BRL TO
30 SSE RFD.
..LYONS..08/16/25
ATTN...WFO...DVN...ILX...LOT...
STATUS REPORT FOR WS 592
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC011-095-123-143-155-175-179-203-160240-
IL
. ILLINOIS COUNTIES INCLUDED ARE
BUREAU KNOX MARSHALL
PEORIA PUTNAM STARK
TAZEWELL WOODFORD
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
1 month ago
WW 592 SEVERE TSTM IL 152345Z - 160400Z
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 592
NWS Storm Prediction Center Norman OK
645 PM CDT Fri Aug 15 2025
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Northern Illinois
* Effective this Friday evening from 645 PM until 1100 PM CDT.
* Primary threats include...
Scattered damaging wind gusts to 70 mph possible
Isolated large hail events to 1 inch in diameter possible
SUMMARY...A well-organized cluster of storms with a history of 70+
mph wind gusts across eastern Iowa will continue southeastward into
northern Illinois. Even with a weakening trend over time, damaging
winds will remain a possibility, and perhaps some hail.
The severe thunderstorm watch area is approximately along and 50
statute miles north and south of a line from 5 miles west northwest
of Moline IL to 75 miles east of Moline IL. For a complete depiction
of the watch see the associated watch outline update (WOUS64 KWNS
WOU2).
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 590...WW 591...
AVIATION...A few severe thunderstorms with hail surface and aloft to
1 inch. Extreme turbulence and surface wind gusts to 60 knots. A few
cumulonimbi with maximum tops to 550. Mean storm motion vector
30040.
...Guyer
Read more
1 month ago
SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0759 PM CDT Fri Aug 15 2025
Valid 160100Z - 161200Z
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS EVENING INTO
THE OVERNIGHT HOURS ACROSS PARTS OF CENTRAL AND EASTERN SOUTH
DAKOTA...NORTHERN NEBRASKA...SOUTHWESTERN MINNESOTA...NORTHWESTERN
IOWA...PARTS OF SOUTHEASTERN IOWA AND SOUTHWESTERN WISCONSIN...
...SUMMARY...
An organizing cluster of thunderstorms with potential to produce
strong to severe wind gusts may still evolve later this evening into
the overnight hours across parts of the middle Missouri Valley and
adjacent Great Plains.
...01Z Update...
Stronger westerlies remain generally confined to the higher
latitudes, near/north of the Canadian/U.S. border. To the southwest
of one significant embedded short wave trough crossing the Hudson
Bay and northern Ontario vicinity, modest westerly mid-level flow
(including speeds of 30-40 kt around 500 mb) is overspreading areas
as far south as the Dakotas into Upper Midwest, near the northern
periphery of mid-level ridging. Forcing associated with subtle
perturbations embedded within this regime has contributed to several
developing clusters of storms. A couple now propagating east of
the upper Mississippi Valley appear to be in the process of
weakening, likely due to some combination of weak/weakening lift and
increasing inhibition beneath relatively warm mid-level temperatures
encompassing much of the northern and central Great Plains into
Midwest.
Beneath steeper mid-level lapse rates upstream, boundary-layer
moisture east of the lee surface trough across the high plains is
still contributing to strong to extreme potential instability across
much of central and eastern South Dakota/Nebraska, as scattered high
based convection emerges from eastern Wyoming and northeastern
Colorado. It appears possible that low-level forcing for ascent,
near the nose of a nocturnally strengthening southerly low-level
jet, could contribute to a consolidating and upscale growing
cluster, particularly as activity acquires more unstable inflow
later this evening into the overnight. Various model output,
including the NAM and Rapid Refresh, suggest that the evolution of a
notable convective perturbation is possible, which could be
accompanied by a swath of strong to severe wind gusts.
..Kerr.. 08/16/2025
Read more
1 month ago
SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0759 PM CDT Fri Aug 15 2025
Valid 160100Z - 161200Z
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS EVENING INTO
THE OVERNIGHT HOURS ACROSS PARTS OF CENTRAL AND EASTERN SOUTH
DAKOTA...NORTHERN NEBRASKA...SOUTHWESTERN MINNESOTA...NORTHWESTERN
IOWA...PARTS OF SOUTHEASTERN IOWA AND SOUTHWESTERN WISCONSIN...
...SUMMARY...
An organizing cluster of thunderstorms with potential to produce
strong to severe wind gusts may still evolve later this evening into
the overnight hours across parts of the middle Missouri Valley and
adjacent Great Plains.
...01Z Update...
Stronger westerlies remain generally confined to the higher
latitudes, near/north of the Canadian/U.S. border. To the southwest
of one significant embedded short wave trough crossing the Hudson
Bay and northern Ontario vicinity, modest westerly mid-level flow
(including speeds of 30-40 kt around 500 mb) is overspreading areas
as far south as the Dakotas into Upper Midwest, near the northern
periphery of mid-level ridging. Forcing associated with subtle
perturbations embedded within this regime has contributed to several
developing clusters of storms. A couple now propagating east of
the upper Mississippi Valley appear to be in the process of
weakening, likely due to some combination of weak/weakening lift and
increasing inhibition beneath relatively warm mid-level temperatures
encompassing much of the northern and central Great Plains into
Midwest.
Beneath steeper mid-level lapse rates upstream, boundary-layer
moisture east of the lee surface trough across the high plains is
still contributing to strong to extreme potential instability across
much of central and eastern South Dakota/Nebraska, as scattered high
based convection emerges from eastern Wyoming and northeastern
Colorado. It appears possible that low-level forcing for ascent,
near the nose of a nocturnally strengthening southerly low-level
jet, could contribute to a consolidating and upscale growing
cluster, particularly as activity acquires more unstable inflow
later this evening into the overnight. Various model output,
including the NAM and Rapid Refresh, suggest that the evolution of a
notable convective perturbation is possible, which could be
accompanied by a swath of strong to severe wind gusts.
..Kerr.. 08/16/2025
Read more
1 month ago
SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0759 PM CDT Fri Aug 15 2025
Valid 160100Z - 161200Z
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS EVENING INTO
THE OVERNIGHT HOURS ACROSS PARTS OF CENTRAL AND EASTERN SOUTH
DAKOTA...NORTHERN NEBRASKA...SOUTHWESTERN MINNESOTA...NORTHWESTERN
IOWA...PARTS OF SOUTHEASTERN IOWA AND SOUTHWESTERN WISCONSIN...
...SUMMARY...
An organizing cluster of thunderstorms with potential to produce
strong to severe wind gusts may still evolve later this evening into
the overnight hours across parts of the middle Missouri Valley and
adjacent Great Plains.
...01Z Update...
Stronger westerlies remain generally confined to the higher
latitudes, near/north of the Canadian/U.S. border. To the southwest
of one significant embedded short wave trough crossing the Hudson
Bay and northern Ontario vicinity, modest westerly mid-level flow
(including speeds of 30-40 kt around 500 mb) is overspreading areas
as far south as the Dakotas into Upper Midwest, near the northern
periphery of mid-level ridging. Forcing associated with subtle
perturbations embedded within this regime has contributed to several
developing clusters of storms. A couple now propagating east of
the upper Mississippi Valley appear to be in the process of
weakening, likely due to some combination of weak/weakening lift and
increasing inhibition beneath relatively warm mid-level temperatures
encompassing much of the northern and central Great Plains into
Midwest.
Beneath steeper mid-level lapse rates upstream, boundary-layer
moisture east of the lee surface trough across the high plains is
still contributing to strong to extreme potential instability across
much of central and eastern South Dakota/Nebraska, as scattered high
based convection emerges from eastern Wyoming and northeastern
Colorado. It appears possible that low-level forcing for ascent,
near the nose of a nocturnally strengthening southerly low-level
jet, could contribute to a consolidating and upscale growing
cluster, particularly as activity acquires more unstable inflow
later this evening into the overnight. Various model output,
including the NAM and Rapid Refresh, suggest that the evolution of a
notable convective perturbation is possible, which could be
accompanied by a swath of strong to severe wind gusts.
..Kerr.. 08/16/2025
Read more
Checked
5 years 11 months ago
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