Subj : DAY3SVR: Nws Storm Prediction Center Norman Ok
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Thu Nov 09 2023 08:28:01

ACUS03 KWNS 090827
SWODY3
SPC AC 090826

Day 3 Convective Outlook
NWS Storm Prediction Center Norman OK
0226 AM CST Thu Nov 09 2023

Valid 111200Z - 121200Z

....NO SEVERE THUNDERSTORM AREAS FORECAST...

....SUMMARY...
Isolated thunderstorms are possible across far northwest Washington
on Saturday. Thunderstorms are not expected elsewhere.

....Synopsis...
A northern-stream shortwave trough is expected to extend across the
northern and central High Plains early Saturday morning, with
another shortwave trough in its wake over British Columbia and WA.
Both of these shortwaves are expected to make steady eastward
progress throughout the day, with the lead wave reaching the
Upper/Mid MS Valley and the second wave reaching eastern
Saskatchewan. The progressive train of shortwaves within the
northern stream is expected to continue with another wave entering
the Pacific Northwest/southern British Columbia Saturday morning,
and reaching central Saskatchewan by Sunday morning. Strong forcing
for ascent and cold mid-level temperatures could result in isolated
lightning flashes Saturday morning.

Farther south, a southern-stream shortwave trough initially
extending from eastern AZ into northern Baja will drift southward
into northwest Mexico, becoming increasingly displaced south of the
stronger westerly flow aloft.

The evolution of these waves will be displaced north and west of any
low-level moisture, which is expected to be confined to the
immediate Gulf Coast and over FL. Moist southwesterly flow aloft
will remain over the region, with a shortwave trough expected to
progress through this flow from the middle TX Coast into southern
LA. A few lightning flashes are possible in the vicinity of this
wave along the immediate coast, but coverage over land areas is
expected to remain less than 10%.

...Mosier.. 11/09/2023

$$

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