SPC MD 61

MD 0061 CONCERNING HEAVY SNOW FOR PORTIONS OF IA...SOUTHERN WI...AND NORTHERN IL

Mesoscale Discussion 0061
NWS Storm Prediction Center Norman OK
0907 PM CST Thu Feb 08 2018

Areas affected...Portions of IA...southern WI...and northern IL

Concerning...Heavy snow 

Valid 090307Z - 090900Z

SUMMARY...A narrow band of moderate to heavy snow will likely
produce snowfall rates around 1 inch per hour through the early
morning.

DISCUSSION...A low-amplitude shortwave trough present over NE/KS
will move eastward across the Upper Midwest overnight. Large-scale
lift ahead of this trough has promoted a broad area of light to
moderate snow extending from eastern SD to southern WI/northern IL.
A strengthening southwesterly low-level jet across southern IA is
focusing a low-level baroclinic zone across central IA as of 03Z.
Related frontogenetic forcing should remain centered around 850 mb,
and a narrow west-to-east oriented band of moderate to heavy snow
has recently developed across central IA on the nose of the
low-level jet. Snowfall rates around 1 inch per hour in this band
will likely occur through the remainder of the evening and continue
through the overnight hours. As the shortwave trough develops
eastward, the moderate to heavy snow band will shift eastward into
southern WI and northern IL (including the Chicago metro), mainly
after 05Z.

..Gleason.. 02/09/2018

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

ATTN...WFO...LOT...MKX...DVN...ARX...DMX...FSD...OAX...

LAT...LON   41999517 42069591 42389617 42759576 42939447 43079144
            42958858 42758768 42318769 41838750 41328771 41358837
            41669002 41859140 41949291 42029446 41999517 

Read more

from SPC Forecast Products http://www.spc.noaa.gov/products/md/md0061.html