RSS Mesoscale Discussions from Storm Prediction Center
WW 326 SEVERE TSTM IA MO 131405Z - 132000Z
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 326
NWS Storm Prediction Center Norman OK
905 AM CDT Sat Jun 13 2026
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
South-Central Iowa
North-Central Missouri
* Effective this Saturday morning and afternoon from 905 AM until
300 PM CDT.
* Primary threats include...
Scattered damaging wind gusts to 70 mph possible
Isolated large hail events to 1.5 inches in diameter possible
SUMMARY...Bowing line segment currently moving through far
west-central Iowa is expected to continue
east-southeastward/southeastward over the next several hours. Strong
to severe gusts have already occurred with this line, with the
threat for damaging gusts expected to continue into south-central
Iowa and north-central Missouri. Isolated hail is also possible with
any storms that develop in the wake of this line segment.
The severe thunderstorm watch area is approximately along and 50
statute miles north and south of a line from 50 miles west northwest
of Lamoni IA to 30 miles north northeast of Kirksville MO. 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 325...
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 500. Mean storm motion vector
28035.
...Mosier
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WW 325 SEVERE TSTM IA NE 130945Z - 131600Z
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 325
NWS Storm Prediction Center Norman OK
445 AM CDT Sat Jun 13 2026
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Western Iowa
Central and Eastern Nebraska
* Effective this Saturday morning from 445 AM until 1100 AM CDT.
* Primary threats include...
Scattered large hail and isolated very large hail events to 2.5
inches in diameter possible
Isolated damaging wind gusts to 70 mph possible
SUMMARY...Scattered elevated thunderstorms will continue to develop
across central and eastern Nebraska through the predawn hours, and
eventually develop into western Iowa. Large hail will be the most
common severe concern, but some damaging wind potential could also
develop over time, mainly across far eastern Nebraska into western
Iowa later this morning.
The severe thunderstorm watch area is approximately along and 65
statute miles north and south of a line from 10 miles south of
Broken Bow NE to 20 miles east of Omaha NE. 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 324...
AVIATION...A few severe thunderstorms with hail surface and aloft to
2.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
27025.
...Guyer
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WW 0326 Status Updates
STATUS FOR WATCH 0326 HAS NOT BEEN ISSUED YET
Read more
WW 0325 Status Updates
STATUS REPORT ON WW 325
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..BROYLES..06/13/26
ATTN...WFO...OAX...GID...LBF...
STATUS REPORT FOR WS 325
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IAC071-085-129-133-137-145-155-165-131340-
IA
. IOWA COUNTIES INCLUDED ARE
FREMONT HARRISON MILLS
MONONA MONTGOMERY PAGE
POTTAWATTAMIE SHELBY
NEC001-003-009-011-019-021-023-025-035-037-039-041-047-053-055-
059-071-073-077-079-081-093-099-109-115-119-121-125-131-137-139-
141-143-151-153-155-159-163-167-173-175-177-179-183-185-
131340-
NE
. NEBRASKA COUNTIES INCLUDED ARE
ADAMS ANTELOPE BLAINE
BOONE BUFFALO BURT
BUTLER CASS CLAY
COLFAX CUMING CUSTER
DAWSON DODGE DOUGLAS
FILLMORE GARFIELD GOSPER
GREELEY HALL HAMILTON
HOWARD KEARNEY LANCASTER
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MD 1118 CONCERNING SEVERE THUNDERSTORM WATCH 325... FOR SOUTHEAST NEBRASKA...SOUTHWEST IOWA...FAR NORTHWEST MISSOURI
Mesoscale Discussion 1118
NWS Storm Prediction Center Norman OK
0803 AM CDT Sat Jun 13 2026
Areas affected...Southeast Nebraska...Southwest Iowa...Far Northwest
Missouri
Concerning...Severe Thunderstorm Watch 325...
Valid 131303Z - 131500Z
The severe weather threat for Severe Thunderstorm Watch 325
continues.
SUMMARY...A threat for isolated large hail and severe wind gusts
will likely continue over the next couple of hours from southeast
Nebraska into southwest Iowa and far northwest Missouri. As the
storms move toward the edge of Watch 325, additional watch issuance
will likely need to be considered.
DISCUSSION...The latest high-resolution radar imagery shows a strong
line segment ongoing to the west of Omaha. The line is located at
the northern end of a pocket of moderate instability, analyzed by
the RAP from northeastern Kansas into southeastern Nebraska. MLCAPE
within this corridor is estimated to be in the 2000 to 2500 J/kg
range. In addition, the RAP shows a plume of steep mid-level lapse
rates (in the 7.5 to 8.5 C/km range) extending eastward from
northwest Kansas into southeast Nebraska. This environment will
continue to support an isolated large hail threat this morning. In
addition, a potential will exist for isolated severe gusts, and this
threat could increase if the line can become more organized. The
threat may tend to move more southeastward into far northwest
Missouri, favoring the eastern edge of the stronger instability.
..Broyles.. 06/13/2026
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...DMX...EAX...OAX...TOP...GID...
LAT...LON 39719507 39909595 40139664 40529748 40929764 41199757
41619716 41799659 41789623 41339522 40869438 40539401
40039408 39739451 39719507
MOST PROBABLE PEAK WIND GUST...55-70 MPH
MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN
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SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0753 AM CDT Sat Jun 13 2026
Valid 131300Z - 141200Z
...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS
OF THE CENTRAL PLAINS AND LOWER MISSOURI VALLEY...
...SUMMARY...
Scattered severe thunderstorms are likely today and tonight across
parts of the central and southern Plains to Missouri Valley and
Middle Mississippi Valley. Swaths of damaging wind gusts, large
hail, and a few tornadoes are all possible.
...Central/Southern Plains to Middle Mississippi Valley...
An active severe-weather day is anticipated with multiple rounds of
severe storms expected regionally today into tonight. Near the nose
of a southwesterly low-level jet, an initial early day severe risk
will focus across southeast Nebraska, where elevated/increasingly
organized storms are ongoing just after dawn, into southern Iowa and
northern Missouri. Large hail will remain possible, but the
potential for damaging winds may increase relatively early today as
storms spread east-southeastward.
Meanwhile, a more complex scenario exists farther south,
attributable to persistent predawn storms across the Ozarks, as well
as a decayed convective cluster and one or more residual MCVs across
Oklahoma and far southeast Kansas. These MCVs, as they focus deeper
convection along modifying outflow/differential heating zones,
should inspire renewed deeper convective development this afternoon
across parts of the Ozarks toward the Mid-South/middle Mississippi
Valley. This includes the potential for some supercells and
organizing clusters, with damaging winds and some hail as the
primary hazards through evening.
Farther west and later in the day, strong diurnal heating/steepening
low-level lapse rates preceding the surface low will result in
scattered thunderstorm development near/ahead of the
southeast-moving cold front, with the most intense development
likely favoring where the front intercepts the west-southwest
periphery of early day storms and any residual cloud cover/modifying
outflow. This will likely include central/eastern Kansas and
possibly far southeast Nebraska into western/northern Missouri.
Steep mid-level lapse rates atop rich boundary-layer moisture will
yield a strongly unstable air mass, which combined with around 40 kt
of effective shear, will support initial intense semi-discrete
supercells as then organizing clusters. All hazards seem likely
including large hail, with damaging winds potentially evolving as
the most prominent risk this evening, potentially including some
significant (75+ mph) wind gusts. The potential for tornadoes will
also exist, particularly late afternoon into evening as the
low-level jet increases, with modifying outflow potentially another
factor across west/southwest Missouri and possibly far eastern
Kansas and vicinity.
...Carolinas/Coastal Southeast...
Ample heating within a moist environment south of a front will lead
to moderately strong diurnal destabilization, with convective
development aided by the front and coastal sea breeze. Some
pulse-type locally severe storms capable of downbursts/wind damage
may occur this afternoon through around sunset.
..Guyer/Broyles.. 06/13/2026
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