WW 243 SEVERE TSTM IA MN NE SD 242155Z - 250400Z
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 243
NWS Storm Prediction Center Norman OK
455 PM CDT Sun May 24 2026
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Northwest Iowa
Southwest Minnesota
Northeast Nebraska
Southeast South Dakota
* Effective this Sunday afternoon and evening from 455 PM until
1100 PM CDT.
* Primary threats include...
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
Isolated damaging wind gusts to 65 mph possible
SUMMARY...High-based supercells are expected from northeast Nebraska
across southeast South Dakota into southwest Minnesota this evening,
and storms could spread into northwest Iowa before weakening early
tonight. The storms will be capable of producing large hail (1.5-2
inches in diameter) and isolated severe outflow gusts (60-65 mph).
The severe thunderstorm watch area is approximately along and 65
statute miles east and west of a line from 40 miles north of Redwood
Falls MN to 30 miles west southwest of Norfolk NE. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU3).
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.
&&
AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 55 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
27015.
...Thompson
WW 0243 Status Updates
STATUS REPORT ON WW 243
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 NW TQE TO
20 WNW OFK TO 20 ENE ONL TO 30 S MHE TO 30 E MHE TO 15 E BKX TO
45 ENE BKX TO 25 N RWF TO 40 W MSP.
..MEAD..05/25/26
ATTN...WFO...FSD...MPX...OAX...LBF...
STATUS REPORT FOR WS 243
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IAC119-141-143-149-167-250340-
IA
. IOWA COUNTIES INCLUDED ARE
LYON O'BRIEN OSCEOLA
PLYMOUTH SIOUX
MNC013-015-033-063-079-081-083-085-101-103-105-117-127-129-133-
143-161-165-250340-
MN
. MINNESOTA COUNTIES INCLUDED ARE
BLUE EARTH BROWN COTTONWOOD
JACKSON LE SUEUR LINCOLN
LYON MCLEOD MURRAY
NICOLLET NOBLES PIPESTONE
REDWOOD RENVILLE ROCK
SIBLEY WASECA WATONWAN
NEC027-043-051-107-139-173-179-250340-
MD 0851 CONCERNING SEVERE THUNDERSTORM WATCH 243... FOR SOUTHWEST MINNESOTA...SOUTHEAST SOUTH DAKOTA...FAR NORTHWEST IOWA...AND NORTHEAST NEBRASKA
Mesoscale Discussion 0851
NWS Storm Prediction Center Norman OK
0848 PM CDT Sun May 24 2026
Areas affected...southwest Minnesota...southeast South Dakota...far
northwest Iowa...and northeast Nebraska
Concerning...Severe Thunderstorm Watch 243...
Valid 250148Z - 250315Z
The severe weather threat for Severe Thunderstorm Watch 243
continues.
SUMMARY...Large-hail potential is expected to become more isolated
through 04z.
DISCUSSION...Recent radar and satellite trends indicate warming
cloud tops and lowering reflectivity cores, which coincides with the
gradual cooling and stabilization of the boundary layer. However,
plan-view VWP data and short-term model forecasts indicate the
strengthening of a nocturnal low-level jet from south-central NE
into southeast SD. Enhanced convergence and moist flux within the
terminus of that feature may support the continuation of isolated,
strong to severe storms in far southeast SD and northwest IA for the
next hour or two. Elsewhere, expect a gradual decrease in storm
coverage and intensity through 04z as convective inhibition
continues to increase.
..Mead.. 05/25/2026
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...MPX...FSD...OAX...
LAT...LON 41809818 42419827 42979817 43909778 44179729 44589600
44879541 45119490 45009431 44479358 43969350 43739437
43609496 43039526 42579571 42049625 41929655 41579738
41809818
MOST PROBABLE PEAK WIND GUST...UP TO 60 MPH
MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN
SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0752 PM CDT Sun May 24 2026
Valid 250100Z - 251200Z
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS EVENING
ACROSS PARTS OF NORTHEASTERN NEBRASKA...SOUTHEASTERN SOUTH
DAKOTA...NORTHWESTERN IOWA...SOUTHWESTERN MINNESOTA...
...SUMMARY...
Isolated supercell development may persist in a narrow corridor
across northeastern Nebraska into southwestern Minnesota through mid
to late evening before diminishing.
...01Z Update...
...Mid Missouri Valley...
Mid-level heights continue to build across much of the northern
Rockies and Missouri Valley into Upper Midwest. Primary forcing for
ongoing convective development appears to lift associated with weak
lower/mid-tropospheric warm advection, along and east of weak
northern Great Plains surface troughing. Low-level moisture return
has remained rather modest (with maximum surface dew points still in
the mid/upper 50s F) and confined to a narrow corridor, but this
appears to be contributing to CAPE on the order of 1000-2000 J/kg.
The onset of radiational surface cooling, coupled with warming
aloft, probably will result in rapidly increasing inhibition within
the next couple of hours. This should be accompanied by diminishing
convective trends, but it is possible that this could be slowed
somewhat by forcing on the nose of a nocturnally strengthening
low-level jet.
...Southern Appalachians...
As a remnant lower/mid-tropospheric mesoscale convective vortex
migrates north-northeastward across northwestern Georgia into the
southern Appalachians, modest clockwise-curved low-level hodographs
are developing across the Piedmont of eastern Georgia into South
Carolina. This is where a recent increase in thunderstorm
development is ongoing in the presence of a seasonably moist
boundary-layer characterized by sizable CAPE. With the surface dew
points in the lower 70s enhancing low-level buoyancy and potential
near surface upward accelerations, an isolated tornado may not be
out of the question, before forcing spreads into cooler/more stable
air.
..Kerr.. 05/25/2026
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