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Archives for the SPC Convective Outlook are updated daily (approximately) with a live map at the beginning of each article. Follow the link at the end of the article to check for current updates on the NOAA/NWS Storm Prediction Center website. Also, see Archives for Chicago's hourly weather data on CARDINAL NEWS Magazine.

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Friday, March 21, 2025

SPC Mar 21, 2025 0600 UTC Day 1 Convective Outlook

LIVE MAP (ABOVE) ... SPC 1200Z Day 1 Outlook


Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1146 PM CDT Thu Mar 20 2025

Valid 211200Z - 221200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Severe thunderstorms are not forecast today.

...Synopsis...
A northwest flow regime will exist across the CONUS today, with
multiple embedded waves. In general, minimal thunderstorm activity
is forecast due to a relatively stable air mass due to high
pressure. One such high will be situated over the Southeast and into
the Gulf through the period, with minimal moisture return into
southern TX. Another surface high will be centered over the Great
Basin for much of the period. That said, thunderstorm chances will
be limited to a small part of the Pacific Northwest, and from
southeast SD across IA and into IL. Both areas will be beneath their
respective shortwave troughs, with cool temperatures aloft
supporting weak convection.

..Jewell/Lyons.. 03/21/2025


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