Subj : MESO: Mesoscale Discussion 0266
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Fri Mar 10 2023 19:34:55

ACUS11 KWNS 101934
SWOMCD
SPC MCD 101934=20
IDZ000-UTZ000-NVZ000-102130-

Mesoscale Discussion 0266
NWS Storm Prediction Center Norman OK
0134 PM CST Fri Mar 10 2023

Areas affected...portions of southern Idaho

Concerning...Snow Squall=20

Valid 101934Z - 102130Z

SUMMARY...A snow squall is expected to continue across southern
Idaho over the next couple of hours. Damaging to severe-equivalent
wind gusts are the main threat with this line. Brief bouts of heavy
snow and reduced visibility are also possible along with a 15-20 F
drop in surface temperatures to near freezing.

DISCUSSION...A snow squall has rapidly materialized across portions
of southern ID to the NV border, with recent observations showing
wind gusts exceeding 60 kts and a 15-20 F surface temperature plunge
behind the snow-squall leading line. Preceding the snow squall is a
plume of 7 C/km 0-3 km lapse rates. These lapse rates may promote a
strong low-level vertical circulation which could sustain this
intense, low-topped convective band for at least a couple more
hours. The 15+ F surface temperature drop behind the leading line
suggests that snow (perhaps in briefly heavy bouts) may occur behind
the leading line. Furthermore, severe-equivalent wind gusts have
been observed near or in association with this band of low-topped
convection, and these winds appear to be the primary hazard.
Nonetheless, reduced visibility will also be possible (regardless of
precipitation loss) when considering the intense surface wind gusts.
The convective line should eventually weaken after outpacing the
steep low-level lapse rate plume.

...Squitieri.. 03/10/2023

....Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj=
g!7CPnHj7GcXx_tD4iVtfiZp3Sqd_dGYSTXCddykInDp5VFumOd2bfU5_E2IfvQVVzN1A5zhueV=
sahmiGjvLerp3_oZ5s$  for graphic product...

ATTN...WFO...SLC...PIH...BOI...LKN...

LAT...LON   42031460 42601383 42951305 43041243 42831169 42381159
            41961193 41841322 41791429 42031460=20


=3D =3D =3D
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