SPC MD 1744



MD 1744 CONCERNING FREEZING RAIN FOR NORTHEAST SOUTH DAKOTA…EXTREME SOUTHEAST NORTH DAKOTA…EXTREME WESTERN MINNESOTA

MD 1744 Image


Mesoscale Discussion 1744
NWS Storm Prediction Center Norman OK
0709 PM CST Sun Dec 30 2018

Areas affected...Northeast South Dakota...extreme southeast North
Dakota...extreme western Minnesota

Concerning...Freezing rain 

Valid 310109Z - 310515Z

SUMMARY...Freezing rain is underway across the area, with up to
0.05-0.10 inches/3 hour rates expected over the next few hours.

DISCUSSION...A surface low, located across central South Dakota, in
tandem with an ejecting shortwave trough, are contributing to ascent
across the area, where subfreezing surface wet-bulb temperatures are
present. Temperatures within the 925-850 mb layer however, are above
freezing, contributing to the melting of otherwise frozen
hydrometeors in a sub-freezing troposphere. Latest PFC RAP soundings
suggest up to 0.50 inches of precipitable water reside across
northeast South Dakota, suggesting that the aforementioned ascent
will continue to promote light to occasionally moderate freezing
rain for the next 4-5 hours, as also supported by latest model
guidance. 

After around 0400-0500Z, a cold front is expected to move through
the area, with temperatures throughout the troposphere dropping
below freezing. Snow will then become the predominant precipitation
type.

..Squitieri.. 12/31/2018

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

ATTN...WFO...MPX...FGF...FSD...ABR...BIS...

LAT...LON   44399748 44339906 45059976 45769991 46039893 46069740
            45839671 45409627 44929627 44399688 44399748 

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