920
ACUS11 KWNS 060434
SWOMCD
SPC MCD 060433
IAZ000-MOZ000-060600-

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