LIVE MAP (ABOVE) ... SPC 1200Z Day 1 Outlook
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
1116 PM CST Thu Dec 28 2023
Valid 291200Z - 301200Z
...NO SEVERE THUNDERSTORM AREAS FORECAST...
...SUMMARY...
The risk for thunderstorms appears negligible across much of the
nation today, but showers and isolated thunderstorms are possible
near southern Oregon through northern and central California coastal
areas this evening through early Saturday.
...Discussion...
A significant short wave trough, which has emerged from a strong,
zonal mid/upper jet extending across the southern mid-latitude
western through central Pacific, maintains considerable strength as
it slowly progresses across the eastern Pacific. However, models
indicate considerable deformation and weakening of this feature as
it continues eastward into an amplified split flow, which includes
building large-scale mid/upper ridging across and inland of the
Pacific coast.
While an initially broad and deep, associated occluding cyclone is
forecast to weaken while migrating north-northeastward into areas
offshore of the British Columbia coast, models indicate that the
trailing front will advance inland across the Pacific coast. Based
on forecast soundings and other model output, relatively warm layers
in mid/upper levels probably will minimize the risk for convection
capable of producing lightning along and ahead of the surface front.
However, in the post-frontal regime, the leading edge of the
stronger mid-level cooling (including 500 mb temperatures
approaching and falling below -24 C) may begin contributing to
thermodynamic profiles more conducive to weak low-topped
thunderstorm activity by this evening, near southern Oregon/northern
California coastal areas. A similar environment may gradually
develop southward near central California coastal through 12Z
Saturday.
..Kerr.. 12/29/2023
Read more CHECK UPDATE ZOOM GRAPHIC
http://dlvr.it/T0kBgt
Windy.com Temps | Gusts | WU KORD KPWK |
CLICK for this month's BIG night sky ... | RADAR FULL MAP SCREEN |
---|
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)
Friday, December 29, 2023
SPC Dec 29, 2023 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)