SPC MD 65



MD 0065 CONCERNING HEAVY SNOW FOR SIERRA MOUNTAINS

MD 0065 Image

Mesoscale Discussion 0065
NWS Storm Prediction Center Norman OK
0318 PM CST Sun Feb 03 2019

Areas affected...Sierra Mountains

Concerning...Heavy snow 

Valid 032118Z - 040315Z

SUMMARY...Heavy snow, with rates of 1 inch per hour and locally
exceeding 3 inches per hour at times -- especially at higher
elevations, will develop into the evening.

DISCUSSION...Strong, moist flow into a cooling troposphere is
supporting efficient snow production across much of the Sierra
Mountains. This large-scale pattern is expected to remain in place
through the evening as strong deep-layer ascent increases in
response to the next cyclone moving southward along the California
coast. Increasing ascent is already evident on water-vapor and
infrared satellite imagery, as well as in radar imagery, across the
Sacramento Valley as cloud tops have cooled and banded/cellular
echos have developed. As the lower troposphere cools, snow levels
fall, and these cellular features move into the Sierras, snowfall
rates briefly approaching 3 inches per hour may occur at elevations
as low as 6000-7000 feet. Strong winds will accompany this heavy
snow resulting in blizzard conditions at times.

Although snow will continue well into the overnight snowfall rates
may relax a bit overnight before picking up in intensity again
tomorrow ahead of the next short-wave trough embedded within the
larger-scale trough.

..Marsh.. 02/03/2019

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

ATTN...WFO...REV...HNX...STO...

LAT...LON   37431950 38332036 39532113 39712048 38901987 37781883
            37431950 

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