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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)

Sunday, September 7, 2025

SPC Sep 7, 2025 1300 UTC Day 1 Convective Outlook

LIVE MAP (ABOVE) ... SPC 1300Z Day 1 Outlook


Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0709 AM CDT Sun Sep 07 2025

Valid 071300Z - 081200Z

...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS
OF THE CENTRAL AND SOUTHERN HIGH PLAINS...

...SUMMARY...
A few stronger thunderstorms capable of marginally severe wind
gusts/hail are possible across portions of the central and southern
High Plains late this afternoon through the early evening.

...Central/Southern High Plains...
Morning water-vapor imagery shows a low/trough over the eastern
Pacific with a downstream ridge over the Rockies. A couple of weak
disturbances are cresting the ridge and may aid in storm development
later this afternoon/evening over the central High Plains later
today.

In the low levels, a lee trough and an associated moisture plume
over the High Plains will provide a focus for isolated to widely
scattered storms. Strong heating over the High Plains will
contribute to weak to moderate buoyancy by late afternoon.
South-southeasterly low-level winds veering to around 20-kt
northwesterly mid-level flow will support some modest updraft
organization. The stronger storms may yield an isolated severe-hail
(diameter 1.5 inches or less) and wind-gust (55-65 mph) threat. A
small cluster or two is expected to evolve during the evening
coincident with an increase in the LLJ. This activity will likely
move east-southeast into western KS and the OK/TX Panhandles, where
a cooling boundary layer and increasing CINH will act to limit
severe potential by mid-late evening.

..Smith/Broyles.. 09/07/2025


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