SPC Mesoscale Discussion

SPC MD 134

MD 0134 CONCERNING SNOW SQUALL FOR NORTHWEST TO CENTRAL WYOMING
        
MD 0134 Image

Mesoscale Discussion 0134
NWS Storm Prediction Center Norman OK
0251 PM CST Wed Feb 08 2023

Areas affected...Northwest to central Wyoming

Concerning...Snow Squall 

Valid 082051Z - 090045Z

SUMMARY...A band of snow will continue to push into central Wyoming
where environmental conditions are favorable for snow squalls.
Periods of heavy snow, gusty winds, and reduced visibility will be
possible through the late afternoon hours.

DISCUSSION...Recent web cams and surface observations from northern
and northwestern WY show reduced visibility down to 1/4 mile
coincident with the passage of a narrow snow band associated with a
surface trough. Recent RAP mesoanalysis reveals 0-3 km lapse rates
near 8-9 C/km, and forecast soundings suggest these lapse rates may
extend up to the 500-400 mb layer. This will support downward mixing
of stronger flow aloft (manifesting as gusts up to 30-40 mph) and is
supporting 100-250 J/kg SBCAPE. This buoyancy will maintain a
convective element to the snow band, which is favorable for brief
periods of heavy snowfall. This environment extends well into
central WY, which will maintain the potential for snow squalls
through the late afternoon hours.

..Moore.. 02/08/2023

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...UNR...CYS...BYZ...RIW...

LAT...LON   43301028 43810915 44690772 44390589 43680574 42920625
            42470720 42040815 41940913 42130982 42581031 42901040
            43301028 

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