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ACUS11 KWNS 170646
SWOMCD
SPC MCD 170646
IAZ000-ILZ000-171045-

Mesoscale Discussion 0106
NWS Storm Prediction Center Norman OK
1246 AM CST Sun Feb 17 2019

Areas affected...Central into eastern IA

Concerning...Heavy snow

Valid 170646Z - 171045Z

SUMMARY...Heavy snow, with up to 1 inch/hr snowfall rates, is
expected to continue for a few more hours.

DISCUSSION...A mid-level shortwave trough continues to impinge on
the discussion area, with strong divergence noted at 300 mb
associated with the left-exit region of a pronounced jet streak. As
such, adequate upper-level support for ascent remains in place to
encourage the lifting of saturated parcels through a deep dendritic
growth layer (-12 to -17 C), where heavy snow will remain possible,
including at least brief occasions of 1 in/hr snowfall accumulation
rates.

As sunrise approaches, the intensity of the primary band of snow is
expected to wane, with much lower snowfall rates expected per latest high-resolution model guidance.

..Squitieri.. 02/17/2019

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

ATTN...WFO...DVN...ARX...DMX...

LAT...LON 40889127 41239317 41709455 42649404 42989286 42679145
42099056 40949059 40889127



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