MESO: Mesoscale Discussion 0010

ACUS11 KWNS 081943
SWOMCD
SPC MCD 081943
ARZ000-MOZ000-OKZ000-082345-

MESOSCALE DISCUSSION 0010
NWS STORM PREDICTION CENTER NORMAN OK
0143 PM CST WED JAN 08 2014

AREAS AFFECTED...WRN/NWRN AR AND EXTREME ERN OK

CONCERNING...FREEZING RAIN

VALID 081943Z - 082345Z

SUMMARY...LIGHT FREEZING RAIN/DRIZZLE WILL CONTINUE THROUGH THE
AFTERNOON...WITH PEAK HOURLY ACCUMULATIONS OF 0.02-0.05 INCHES.

DISCUSSION...DESPITE A LARGER-SCALE WAA REGIME...THE ARCTIC AIR MASS
HAS BEEN SLOW TO ERODE ACROSS THE OZARKS. A RESIDUAL NEAR-SURFACE
SUB-FREEZING AIR MASS IS BEING MAINTAINED AS LIGHT PRECIPITATION
FALLS INTO THE PREVIOUSLY DRY BOUNDARY LAYER. TERRAIN INFLUENCES
AND CONTINUED DEVELOPMENT OF LIGHT PRECIPITATION ALONG THE AXIS OF
STRONGEST MOISTURE RETURN/WAA JUST ABOVE THE SURFACE WILL HELP
MAINTAIN A SHALLOW LAYER OF 30-32 F TEMPERATURES NEAR THE
SURFACE...RESULTING IN FREEZING RAIN/DRIZZLE AS THE PRIMARY
PRECIPITATION TYPE. THROUGH NEAR-SURFACE AIR TEMPERATURES AND
PRECIPITATION RATES WILL BE MARGINAL FOR SIGNIFICANT ICE
ACCUMULATION...EXPOSED SURFACES AND VEGETATION ARE RELATIVELY COLD
AS A RESULT OF THE PRIOR ARCTIC INTRUSION. THUS...WHAT
PRECIPITATION FALLS MAY TEND TO FREEZE ON EXPOSED SURFACES MORE
EFFICIENTLY THAN NORMALLY EXPECTED FOR THE OBSERVED RANGE OF
TEMPERATURES.

..THOMPSON.. 01/08/2014

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...LZK...SGF...SHV...TSA...

LAT...LON 35719214 35149250 34669280 34299298 34109327 34049379
34069437 34209480 34439498 34629463 34849424 35319415
35589485 35789483 36039414 36499311 36639261 36639214
36439195 36109195 35719214

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