SPC MD 119

MD 0119 CONCERNING FREEZING RAIN FOR PORTIONS OF THE MID-ATLANTIC INTO CENTRAL VIRGINIA AND NORTHERN NORTH CAROLINA

MD 0119 Image


Mesoscale Discussion 0119
NWS Storm Prediction Center Norman OK
0923 AM CST Thu Feb 18 2021

Areas affected...portions of the mid-Atlantic into central Virginia
and northern North Carolina

Concerning...Freezing rain 

Valid 181523Z - 181830Z

SUMMARY...Sleet and freezing rain continues from the mid-Atlantic
southward into northern North Carolina. The precipitation will
gradually come to an end from west to east through the morning and
early afternoon.

DISCUSSION...Persistent cold air damming in the lee of the
Appalachians has maintained upper 20s to low 30s temperatures as far
south as northern North Carolina. Surface observations in this area
have shown ice accretion as high as 0.1" per hour recently. The
greatest freezing rain accumulation has been across central and
southern Virginia where temperatures remain in the upper 20s to low
30s and precipitation is mostly falling as freezing rain. Farther
north, temperatures are cold enough at the top of the boundary layer
(as seen on IAD 12Z RAOB) to support mostly sleet. Isentropic ascent
will shift northeastward by early afternoon which should bring an
end to precipitation across much of this region by 19-20Z.

..Bentley.. 02/18/2021

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

ATTN...WFO...PHI...AKQ...LWX...RAH...RNK...GSP...

LAT...LON   35458016 35658059 36308008 37187919 37817878 38017871
            38937784 39717695 39717582 39607502 39337447 39197442
            38887455 38787508 38787552 38507580 38277584 37717674
            37347691 36487713 36127789 36017852 35757924 35497976
            35458016 

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from SPC Mesoscale Discussions https://bit.ly/3asGnMt

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