SPC MD 22



MD 0022 CONCERNING HEAVY SNOW FOR NORTHEAST KS…NORTHERN MO…SOUTHERN/EASTERN IA…WESTERN IL

MD 0022 Image


Mesoscale Discussion 0022
NWS Storm Prediction Center Norman OK
0554 PM CST Fri Jan 18 2019

Areas affected...Northeast KS...Northern MO...Southern/Eastern
IA...Western IL

Concerning...Heavy snow 

Valid 182354Z - 190600Z

SUMMARY...Moderate to locally heavy snow rates are possible this
evening.

DISCUSSION...Snow rates have recently intensified across portions of
central/southern IA, in response to increasing deep-layer ascent in
advance of shortwave trough (with multiple embedded vorticity
maxima) moving into the southern Plains. Heavy snow will continue to
be possible across northern MO, central/eastern IA and eventually
into western IL, as low/midlevel frontogenesis (which has been
maximized further north during the day) becomes refocused for a time
this evening across the region. Rates at or above 1 inch/hr will be
possible for at least a few hours at any one location. 

Further to the southwest, the rain/snow line is expected to shift
southeast with time across portions of northeast KS/northwest MO,
with areas currently seeing heavier precip rates from Topeka into
the Kansas City metro area eventually changing over to snow. While
liquid-to-snow ratios will likely be lower compared to areas further
north, locally heavy snowfall rates will be possible for at least a
brief period this evening before the precipitation ends from west to
east later tonight.

..Dean.. 01/18/2019

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

ATTN...WFO...ILX...LSX...DVN...ARX...DMX...EAX...TOP...

LAT...LON   40029522 41759389 42659215 42589114 42479060 42028969
            41169010 40139136 39449343 39059450 38489630 39129685
            40029522 

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