Severe Storm Outlook Narrative (AC)
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ACUS11 KWNS 120244
SPC MCD 120243

Mesoscale Discussion 0018
NWS Storm Prediction Center Norman OK
0843 PM CST Thu Jan 11 2018

Areas affected...Northeast Arkansas...Southeast Missouri...Illinois
and Western Indiana

Concerning...Freezing rain

Valid 120243Z - 120845Z

SUMMARY...A mix of freezing rain and sleet will continue to develop
along a corridor from northeast Arkansas into western Indiana.
Freezing-rain rates will be around 0.10 inches per hour within the
heavier showers.

DISCUSSION...Latest surface analysis shows a distinct cold front
located from far northeast Arkansas north northeastward into
southeast Illinois and western Indiana. A large-scale upper-level
trough over the central U.S. is evident on water-vapor imagery. A
band of enhanced large-scale ascent is located ahead of the
upper-level trough from the mid Mississippi Valley northeastward
into the Ohio Valley according to water-vapor imagery. This is
aiding the development of several large patches of rain with
embedded showers. As the cold front moves southeastward into the mid
Mississippi and lower Ohio Valley, temperatures will rapidly drop
below freezing from northwest to southeast across the region. As
freezing air undercuts the precipitation, freezing rain and sleet
will increase in coverage across the MCD area. Freezing-rain rates
are expected to reach 0.10 inches per hour in some of the heavier

..Broyles/Edwards/Gleason.. 01/12/2018

...Please see for graphic product...


LAT...LON   39108705 37358867 35469019 35279100 35369145 35679202
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