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ACUS11 KWNS 022340
SWOMCD
SPC MCD 022339
OKZ000-TXZ000-030445-

Mesoscale Discussion 0004
NWS Storm Prediction Center Norman OK
0539 PM CST Wed Jan 02 2019

Areas affected...Central Oklahoma...portions of northwest into
west-central Texas

Concerning...Freezing rain

Valid 022339Z - 030445Z

SUMMARY...Freezing rain and sleet are underway in central Oklahoma
into northwest Texas. This activity is expected to continue for
several hours, with multiple precipitation bands traversing the
area.

DISCUSSION...A mix of stratiform and low-topped convective
precipitation (by evidence of recent lightning data) has recently
initiated across portions of central Oklahoma into western Texas,
due to enhanced lift associated with a small impulse ahead of the
large-scale 500 mb closed low overspreading the area. Sfc-925 mb
temperatures are currently below freezing across much of the region,
with RAP analysis soundings indicating temperatures above freezing
in the 850-700 mb layer. The sub-freezing surface layer appears deep
enough to support most of the precipitation reaching the surface as
freezing rain, with a noticeable mix of sleet, as has been observed
in Caddo County to OKC over the past hour. In addition, KTLX and
KDYX doppler radar have indicated up to 45 dBZ in association with
some of the convective elements, suggesting that modest freezing
rain rates of at least .05-.10 in/3 hrs and brief periods of
moderate sleet are possible.

Composite mosaic reflectivity imagery suggests that both the central
Oklahoma and western Texas bands of precipitation are training over
the Red-River Valley, where accumulating freezing rain/sleet may
occur for several hours, also supported by the latest high
resolution model guidance.

..Squitieri.. 01/02/2019

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

ATTN...WFO...TSA...FWD...OUN...SJT...LUB...MAF...

LAT...LON 36469543 35979531 34999568 33429705 32519873 31910108
31720164 31920246 32810207 33730072 35239818 36099705
36839559 36469543



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