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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, September 16, 2025

SPC Sep 17, 2025 0100 UTC Day 1 Convective Outlook

LIVE MAP (ABOVE) ... SPC 0100Z Day 1 Outlook


Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0738 PM CDT Tue Sep 16 2025

Valid 170100Z - 171200Z

...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS IN NORTHWEST KS
AND SOUTHWEST NE...

...SUMMARY...
A diminishing severe threat is expected over the central Great
Plains tonight.

...CO/KS/NE...
Primary severe potential will remain over the next 1-2 hours with
several semi-discrete updrafts across northeast CO, southwest NE,
and northwest KS. Strong low-level convergence in the tri-state
border area will foster amalgamation of these updrafts into a
broader cluster. This will hamper sustained hail growth and support
a diminishing severe threat. With only moderate mid-level
west-southwesterlies sampled in upstream VWPs along the Front Range
and nocturnally increasing MLCIN across the warm sector, later
evening clusters should struggle to greatly organize and severe wind
potential should remain isolated/sporadic.

..Grams.. 09/17/2025


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