SPC MD 106

MD 0106 CONCERNING HEAVY SNOW FOR CENTRAL INTO EASTERN IA

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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from SPC Forecast Products http://www.spc.noaa.gov/products/md/md0106.html