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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)

Tuesday, January 21, 2025

SPC Jan 21, 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
1012 AM CST Tue Jan 21 2025

Valid 211630Z - 221200Z

...NO THUNDERSTORM AREAS FORECAST...

...SUMMARY...
The risk for thunderstorms appears negligible across the U.S. today
through tonight.

...Synopsis...
Expansive high pressure associated with a polar airmass is in place
across is in place east of Rockies. This high, which is currently
centered over eastern OK/western AR, is expected to shift
eastward/northeastward throughout the day, ending the period over
the Ohio Valley. Associated cold, dry, and stable conditions will
preclude thunderstorm development. A similar environment is
anticipated across the western CONUS, with high pressure and
associated stability dominating the sensible weather.

A deepening surface low will continue to shift eastward across the
Gulf of Mexico, with strong warm-air advection throughout its warm
sector contributing to a broad precipitation field across the Gulf
Coast. A few lightning flashes were observed over Acadia Parish in
south-central LA over the past hour, but these flashes were most
likely created by the self-initiated upward leader process. Given
the continuing windy conditions and potential for mixed-phase
hydrometeors at low levels, some additional self-initiated flashes
are possible throughout the period.

..Mosier/Thornton.. 01/21/2025


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