SPC Apr 13, 2025 0600 UTC Day 1 Convective Outlook

SPC 1200Z Day 1 Outlook

Day 1 Convective Outlook  
NWS Storm Prediction Center Norman OK
1245 AM CDT Sun Apr 13 2025

Valid 131200Z - 141200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Thunderstorm development will be possible on Sunday from the upper
Mississippi Valley into the Great Lakes, and from the Intermountain
West to the central High Plains. No severe threat is expected.

...DISCUSSION...
At mid-levels, a ridge will move through the Great Lakes and lower
to mid Mississippi Valley, as a shortwave trough moves through the
northern High Plains. At the surface, a low will move into the mid
Missouri Valley as a cold front advances southeastward through the
central Plains. Head of the front, an axis of low-level moisture
will be in place from the Ozarks northward into Minnesota. Surface
dewpoints are expected to be in the 40s F over the upper Mississippi
Valley, where weak destabilization is expected. Along the northern
part of the instability axis, isolated thunderstorm development will
be possible during the day in parts of south-central Minnesota and
western Wisconsin. In this area, instability will be elevated and
mid-level lapse rates will be steep, suggesting that small hail will
be possible with the stronger cells. Elsewhere, isolated to
scattered thunderstorms, sub-severe in nature, are expected this
afternoon from parts of eastern Utah eastward into the central High
Plains.

..Broyles/Wendt.. 04/13/2025

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