Mesoscale Discussion 0020
NWS Storm Prediction Center Norman OK
0524 AM CST Fri Jan 06 2017
Areas affected...Northeast LA...west-central MS
Concerning...Winter mixed precipitation
Valid 061124Z - 061530Z
SUMMARY...A mix of snow, sleet, and freezing rain is expected over
the next several hours across portions of northeast LA and
west-central MS.
DISCUSSION...Recent regional radar imagery has shown an increase in
elevated shower activity within the warm-air advection regime across
western and central LA. Current surface observations suggest that
much of this precipitation is evaporating before reaching the
surface. However, warm-air advection will persist, with the
resulting mesoscale forcing for ascent and showers eventually
overcoming the dry mid-levels noted on recent RAP soundings. This is
expected to occur across portions of northeastern LA and
west-central MS where surface temperatures are near freezing.
Wet-bulb effects will likely drop any above freezing temperatures
below freezing once precipitation begins. The resulting profile will
then be favorable for freezing rain and/or sleet.
A mix of snow and sleet is most likely across northern portions of
the discussion area (roughly north of I-20) while a mix of freezing
rain and sleet is expected elsewhere. Additionally,
forecast soundings show some elevated instability (mainly above
800mb) so pockets of heavier precipitation and isolated lightning
strikes are possible.
..Mosier.. 01/06/2017
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...JAN...SHV...
LAT...LON 32279249 32859159 33169035 32868972 32378979 31799072
31599160 31799220 32279249
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