ACUS01 KWNS 201947
SWODY1
SPC AC 201946

Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0146 PM CST Fri Dec 20 2024

Valid 202000Z - 211200Z

...NO SEVERE THUNDERSTORM AREAS FORECAST...

...SUMMARY...
Severe weather is not forecast across the contiguous United States
through tonight.

...20z Update...
No changes are needed to the current D1 Convective Outlook. See
previous discussion below for more information.

..Thornton/Mosier.. 12/20/2024

.PREV DISCUSSION... /ISSUED 1010 AM CST Fri Dec 20 2024/

...Synopsis...
Shortwave trough currently moving through the Mid MS Valley is
expected to continue cyclonically through the base of the mean upper
troughing over eastern North America, which takes it off the
Mid-Atlantic Coast late tonight. Another shortwave trough is
expected in its wake over the Great Lakes this afternoon through
tonight, while yet another shortwave trough drops southeastward
through the northern Plains. This evolution will help maintain mean
troughing across the central and eastern CONUS, with cold and stable
low levels precluding thunderstorm development.

Farther west, upper ridging will persist another much of the western
CONUS. Some dampening is anticipated within the northwestern
periphery of is ridging as a pair of shortwave troughs rotate around
an upper low over the northwestern Pacific Ocean. Frontal band
associated with the second of these waves should reach the northern
CA coast early Saturday morning. Cold mid-level temperatures and
related steep mid-level lapse rates may result in enough buoyancy
for a few lightning flashes within this band.

$$

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