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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.

ARLINGTON HEIGHTS WEATHER
O'Hare International Airport KORD (Arlington Heights South)
Chicago Executive Airport KPWK (Arlington Heights North)

Thursday, March 20, 2025

SPC Mar 20, 2025 1630 UTC Day 1 Convective Outlook

LIVE MAP (ABOVE) ... SPC 1630Z Day 1 Outlook


Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1110 AM CDT Thu Mar 20 2025

Valid 201630Z - 211200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Thunderstorm development will be possible today in parts of the
Mid-Atlantic and northern Rockies. Severe weather is not expected.

...Eastern NC/Southeast VA...

Strong heating ahead of an eastward-developing surface front will
allow temperatures to continue climbing into the 70s F this
afternoon. Boundary layer moisture is expected to remain modest,
with surface dewpoints generally reaching the mid/upper 50s F in a
narrow corridor just as the surface front arrives. Morning balloon
observations from GSO, RNK, IAD, and WAL show very dry midlevels as
well. While some midlevel moistening will occur as strong midlevel
southwesterlies overspread the region, overall airmass modification
will remain poor. MLCAPE values are expected to remain stunted,
generally less than 100-200 J/kg. This may be sufficient for a few
lightning flashes as convection develops during the mid afternoon
along the surface front. A well-mixed boundary layer to near 850 mb,
where 25-40 kt of flow is forecast, is evident in forecast
soundings. This may support a few strong gusts to 40 kt, but very
poor thermodynamic profiles suggest potential for severe
thunderstorms should remain low, precluding severe probabilities.

..Leitman/Squitieri.. 03/20/2025


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