LIVE MAP (ABOVE) ... SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1239 AM CDT Tue Mar 18 2025
Valid 181200Z - 191200Z
...THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS ACROSS EASTERN
NEBRASKA INTO IOWA...
...SUMMARY...
Isolated, marginally severe hail is possible later tonight from
eastern Nebraska across much of Iowa.
...NE/IA...
Seasonally strong upper trough is progressing inland across CA into
the Great Basin early this morning. This feature is forecast to
advance across the central Rockies into the High Plains by early
evening as 90+kt 500mb speed max translates across NM into OK by the
end of the period. This evolution warrants a lee cyclone
repositioning itself over western KS by 19/00z with subsequent
movement into northeast KS/northwest MO by sunrise. LLJ will
increase markedly across eastern OK/KS during the late evening, and
strong low-level warm advection will focus along a corridor from
eastern NE into northern IA. Increasing large-scale ascent and
steepening mid-level lapse rates will aid buoyancy along this
corridor as profiles moisten and saturate near 2km. Forecast
soundings exhibit MUCAPE in excess of 700 J/kg and this should
support robust elevated convection ahead of the approaching short
wave. However, due to the limited instability, it appears the
primary risk with this activity will be isolated, marginally severe
hail. Greatest risk for strong storms will be across eastern
NE/western IA along the nose of the LLJ.
..Darrow/Moore.. 03/18/2025
Read more CHECK UPDATE ZOOM GRAPHIC
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Windy.com Temps | Gusts | WU KORD KPWK |
CLICK for this month's BIG night sky ... | RADAR FULL MAP SCREEN |
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MOBILE DEVICE? Turn sideways. Weather conditions directly above are near Lakefront. Top tabs refer to O'Hare (official).
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.
CONVECTIVE | TORNADO | WIND | HAIL
O'Hare International Airport KORD
(Arlington Heights South)
Chicago Executive Airport KPWK
(Arlington Heights North)
Tuesday, March 18, 2025
SPC Mar 18, 2025 0600 UTC Day 1 Convective Outlook
SUNRISE AND SUNSET TIMES IN UTC (if you're not logged in to Google)
CHICAGO UTC-6 during CST (Central Standard Time, e.g., winter)
CHICAGO UTC-5 during CDT (Daylight Savings Time, e.g., summer)
CHICAGO UTC-6 during CST (Central Standard Time, e.g., winter)
CHICAGO UTC-5 during CDT (Daylight Savings Time, e.g., summer)