LIVE MAP (ABOVE) ... SPC 1300Z Day 1 Outlook
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0639 AM CST Tue Feb 04 2025
Valid 041300Z - 051200Z
...NO SEVERE THUNDERSTORM AREAS FORECAST...
...SUMMARY...
Isolated to scattered thunderstorm development will be possible
across central California and along the Oregon Coast, but no severe
thunderstorms are expected.
...Synopsis and Discussion...
A mid/upper cyclone is currently centered off the Pacific
Northwest/British Columbia coast, with moderate southwesterly flow
aloft extending from the base of this low across much of the West
Coast. A low-amplitude shortwave trough is currently moving through
this southwesterly flow into central CA, with continued
northeastward progression across the Great Basin expected today.
Another shortwave trough is expected to follow quickly behind the
first, moving into central CA tonight. Cooler mid-level temperatures
will accompany this second shortwave, supporting the potential for a
few lightning flashes as the frontal band moves ashore. Cooler
temperatures aloft and increased forcing for ascent ahead of a third
shortwave trough could also support isolated lightning flashes early
tomorrow morning along the OR Coast.
Farther east, upper ridging is expected to amplify as it shifts
eastward across the Plains. At the same time, a fast-moving,
low-amplitude shortwave trough will progress through southern
Ontario and the Northeast. Additional southward progress of the cold
front that currently extends from the Mid-Atlantic, TN Valley,
Mid-South, and TX will be limited, with the portion of this front
over TX potentially returning northward as a warm front Wednesday
morning. Warm mid-level temperatures and associated poor lapse rates
will limit buoyancy along this boundary, precluding any thunderstorm
potential.
..Mosier/Bentley.. 02/04/2025
Read more CHECK UPDATE ZOOM GRAPHIC
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Windy.com Temps | Gusts | WU KORD KPWK |
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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, February 4, 2025
SPC Feb 4, 2025 1300 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)