RSS Mesoscale Discussions from Storm Prediction Center
WW 276 SEVERE TSTM IA 060250Z - 060800Z
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 276
NWS Storm Prediction Center Norman OK
950 PM CDT Fri Jun 5 2026
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Southern and Southeastern Iowa
* Effective this Friday night and Saturday morning from 950 PM
until 300 AM CDT.
* Primary threats include...
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
Scattered damaging wind gusts to 70 mph possible
A tornado or two possible
SUMMARY...Supercells should continue to pose a threat for large to
very large hail this evening (up to 2 inches in diameter possible).
A tornado or two may also occur with this activity. A loosely
organized thunderstorm cluster may eventually move across southern
IA overnight and pose some risk for severe/damaging winds.
The severe thunderstorm watch area is approximately along and 40
statute miles north and south of a line from 60 miles west northwest
of Lamoni IA to 55 miles east northeast of Ottumwa IA. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU6).
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 274...WW 275...
AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
27025.
...Gleason
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WW 275 SEVERE TSTM IA KS MO NE 052245Z - 060500Z
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 275
NWS Storm Prediction Center Norman OK
545 PM CDT Fri Jun 5 2026
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Southwest Iowa
North-Central and Northeast Kansas
Northwest Missouri
Southern and Eastern Nebraska
* Effective this Friday afternoon from 545 PM until Midnight CDT.
* Primary threats include...
Scattered damaging winds and isolated significant gusts to 75
mph possible
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
A tornado or two possible
SUMMARY...Thunderstorms should continue to develop this evening
along/near the Kansas/Nebraska border. The strongest thunderstorms
should pose a threat for large to very large hail (up to 2 inches in
diameter) and severe/damaging winds (up to 65-75 mph). A tornado or
two is also possible along/near a stationary front.
The severe thunderstorm watch area is approximately along and 55
statute miles north and south of a line from 30 miles southwest of
Hastings NE to 30 miles east of Shenandoah IA. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU5).
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 274...
AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 65 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
27020.
...Gleason
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WW 0276 Status Updates
STATUS REPORT ON WW 276
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..LYONS..06/06/26
ATTN...WFO...DMX...DVN...
STATUS REPORT FOR WS 276
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IAC001-003-007-029-039-051-053-087-095-099-101-103-107-117-121-
123-125-135-157-159-173-175-177-179-181-183-185-060440-
IA
. IOWA COUNTIES INCLUDED ARE
ADAIR ADAMS APPANOOSE
CASS CLARKE DAVIS
DECATUR HENRY IOWA
JASPER JEFFERSON JOHNSON
KEOKUK LUCAS MADISON
MAHASKA MARION MONROE
POWESHIEK RINGGOLD TAYLOR
UNION VAN BUREN WAPELLO
WARREN WASHINGTON WAYNE
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.
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WW 0275 Status Updates
STATUS REPORT ON WW 275
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 10 WNW CNK
TO 25 ESE GRI TO 5 NNW OLU.
..LYONS..06/06/26
ATTN...WFO...OAX...TOP...EAX...GID...
STATUS REPORT FOR WS 275
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IAC071-129-137-145-155-060440-
IA
. IOWA COUNTIES INCLUDED ARE
FREMONT MILLS MONTGOMERY
PAGE POTTAWATTAMIE
KSC013-043-117-131-157-201-060440-
KS
. KANSAS COUNTIES INCLUDED ARE
BROWN DONIPHAN MARSHALL
NEMAHA REPUBLIC WASHINGTON
MOC003-005-087-147-060440-
MO
. MISSOURI COUNTIES INCLUDED ARE
ANDREW ATCHISON HOLT
NODAWAY
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WW 0274 Status Updates
STATUS REPORT ON WW 274
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 WSW RST
TO 40 WNW RST TO 35 SE MSP TO 35 SW EAU TO 30 S EAU TO 20 NNE VOK.
..DEAN..06/06/26
ATTN...WFO...MPX...ARX...
STATUS REPORT FOR WS 274
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MNC039-109-157-169-060240-
MN
. MINNESOTA COUNTIES INCLUDED ARE
DODGE OLMSTED WABASHA
WINONA
WIC053-063-081-091-121-060240-
WI
. WISCONSIN COUNTIES INCLUDED ARE
JACKSON LA CROSSE MONROE
PEPIN 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
MD 0996 CONCERNING SEVERE THUNDERSTORM WATCH 276... FOR SOUTHERN IOWA
Mesoscale Discussion 0996
NWS Storm Prediction Center Norman OK
1133 PM CDT Fri Jun 05 2026
Areas affected...southern Iowa
Concerning...Severe Thunderstorm Watch 276...
Valid 060433Z - 060600Z
The severe weather threat for Severe Thunderstorm Watch 276
continues.
SUMMARY...Severe storms continue across WW276. A stronger cluster
moving in from the west should transition the threat to mostly
damaging winds. Some hail and a brief tornado remain possible.
DISCUSSION...Over the last several hours, severe storms, including a
few supercells have organized across portions of southern IA. These
storms have been largely stationary, tied to stronger ascent near a
diffuse surface boundary. The environment remains quite unstable and
sufficiently sheared for supercell structures. This will support a
continued risk for hail and isolated damaging gusts.
A larger convective cluster is moving eastward out of WW275. These
storms have a history of producing severe wind gusts, and will
interact with the ongoing storms over IA in the next few hours.
Strong outflow from this forward propagating cluster will likely
favor a damaging wind risk as convection consolidates and the cold
pool continues to strengthen. A brief tornado also remains possible
as strong outflow interacts with any of the more persistent
supercells. Thus, the severe risk will continue for much of WW276
this evening and early overnight period.
..Lyons.. 06/06/2026
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...DVN...DMX...EAX...OAX...
LAT...LON 41449513 41799245 41669151 41239126 40919148 40709189
40659269 40629370 40519464 40529498 40549522 40619551
41449513
MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 90 MPH
MOST PROBABLE PEAK WIND GUST...55-70 MPH
MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN
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SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0800 PM CDT Fri Jun 05 2026
Valid 060100Z - 061200Z
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF
THE CENTRAL PLAINS INTO THE MID MISSOURI AND MID MISSISSIPPI
VALLEYS...
...SUMMARY...
Thunderstorms with large hail and severe wind gusts are expected
this evening from parts of the central Plains into the mid Missouri
and mid Mississippi Valleys. Isolated wind gusts and hail will also
be possible in parts of the upper Mississippi Valley and western
Great Lakes.
...Central Plains/Mid Missouri and Mid Mississippi Valleys...
A mid-level shortwave trough is currently evident on water vapor
imagery over the north-central U.S. The southern part of the trough
extends southwestward into the central Plains. Ahead of this
feature, a moist and unstable airmass is in place from southern
Nebraska and northern Missouri northward into much of Iowa, where
surface dewpoints are in the upper 60s and lower 70s F. Along the
moist axis, the RAP currently has a pocket of strong instability
centered over the mid Missouri Valley with MLCAPE in the 3000 to
4500 J/kg range. A front, where low-level convergence is maximized,
is evident on surface analysis from northwest Iowa southwestward
into south-central Nebraska. Thunderstorms have recently developed
near the front in southeast Nebraska. These storms are expected to
steadily increase in coverage this evening as the shortwave trough
approaches.
From southeast Nebraska into southern Iowa early this evening, RAP
forecast soundings have 0-6 km shear in the 25 to 35 knot range with
700-500 mb lapse rates around 7 C/km. This environment will support
supercells with large hail. Hailstones greater than 2 inches in
diameter will be possible with the more dominant supercells...see
MCD 992. Short-term model forecasts suggest that a cluster of strong
to severe storms will organize during the evening. As this occurs,
the wind-damage threat will likely increase. If a line segment can
become intense, then wind gusts above 70 mph will be possible. The
severe threat will gradually develop eastward across southern Iowa
into northern Illinois from mid to late evening. An isolated severe
threat may persist into the early overnight period.
...Upper Mississippi Valley/Western Great Lakes...
A surface low is evident on surface analysis over northeast
Wisconsin with a cold front extending southwestward across central
and western Wisconsin. A line of strong thunderstorms is ongoing
along the front. Ahead of the front, surface dewpoints in the mid to
upper 60s F are contributing to moderate instability, with the RAP
showing MLCAPE in the 1000 to 2500 J/kg range. Ahead of the front,
the Green Bay and La Crosse WSR-88D VWPs have 0-6 km shear in the 25
to 35 knot range suggesting that deep-layer shear is strong enough
for an isolated severe threat. The more organized multicells along
the line could have potential for hail and isolated severe gusts for
a couple more hours this evening.
..Broyles.. 06/06/2026
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