799
ACUS02 KWNS 280558
SWODY2
SPC AC 280557

Day 2 Convective Outlook
NWS Storm Prediction Center Norman OK
1257 AM CDT Sat Jun 28 2025

Valid 291200Z - 301200Z

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM CENTRAL IOWA
INTO THE WESTERN UPPER PENINSULA OF MICHIGAN....

...SUMMARY...
Scattered strong to severe storms appear possible Sunday from the
central Great Plains into the upper Great Lakes region, with at
least some potential for the evolution of a large, organized severe
storm cluster across parts of the mid into lower Missouri Valley and
central Great Plains late Sunday through Sunday night.

...Synopsis...
A mid-level trough will amplify across the northern Plains on
Sunday. At the surface, a cold front will advance slowly east across
the northern Plains and Upper Midwest.

...Central Plains to the Upper Midwest...
Very strong to potentially extreme instability is forecast from the
central Plains to the Upper Midwest on Sunday. Weak tropospheric
flow is forecast across much of Nebraska, Kansas, and Missouri on
Sunday. This should limit storm organization with only
isolated/widely scattered severe wind gusts possible within this
large zone of marginal risk.

Mid-level flow is forecast to be somewhat stronger across northern
Iowa, but still relatively weak. This may result in slightly more
organized convection where very strong to extreme instability is
also present. Therefore, the slight risk was expanded south to cover
this threat, particularly since scattered to widespread storm
coverage is anticipated. Instability will not be as strong farther
north across Wisconsin, but stronger mid-level flow (30-35 knots)
will be present, which may result in a few rotating updrafts and/or
bowing line segments capable of isolated large hail and severe wind
gusts.

...Mid-Atlantic...
Moderate to strong instability is forecast to develop across
portions of the Mid-Atlantic on Sunday. A very moist environment
will be in place with PWAT values over 2 inches and dewpoints in the
mid 70s. Therefore, wet microburts will be possible with the
strongest storms which develop Sunday afternoon/evening.

..Bentley.. 06/28/2025

$$