SPC MD 31



MD 0031 CONCERNING HEAVY SNOW FOR SOUTHERN ILLINOIS…FAR WESTERN KENTUCKY…AND WEST CENTRAL INTO CENTRAL INDIANA.

MD 0031 Image


Mesoscale Discussion 0031
NWS Storm Prediction Center Norman OK
0321 PM CST Sat Jan 19 2019

Areas affected...Southern Illinois...far western Kentucky...and west
central into central Indiana.

Concerning...Heavy snow 

Valid 192121Z - 200015Z

SUMMARY...Rain, freezing rain, and sleet will continue to transition
to snow from northwest to southeast with moderate to heavy snowfall
expected across this area through the remainder of the afternoon and
into the evening.

DISCUSSION...In the last hour, winds have shifted to northerly up to
2 km on the KIND and KVWX VWP as the 850mb low has started to shift
east of that longitude. This has started to switch rain to snow
across portions of this area with a continued transition expected
over the next several hours. The developing deformation band will
likely have snowfall rates in excess of an inch per hour. Therefore,
significant snowfall accumulations are likely through the evening
before the system shifts east and drier air moves into the area. In
addition to the impacts from the rapidly accumulating snowfall,
winds of 20 to 30 mph with gusts as high as 40 mph will cause
significant blowing and drifting and visibility restrictions. This
will become particularly impactful during the evening hours as a
colder airmass advects into the area and leads to a drier snow which
will be more prone to blowing and drifting.

..Bentley.. 01/19/2019

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

ATTN...WFO...LMK...IND...PAH...ILX...LSX...

LAT...LON   38908881 39298822 39868725 40198649 40328612 40228589
            39878587 39448617 38878664 38278721 37808775 37248822
            36928869 36778920 36718957 36798967 37498963 38278941
            38738906 38908881 

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