SWOMCD
SPC MCD 111251
TXZ000-OKZ000-111645-
MESOSCALE DISCUSSION 0118
NWS STORM PREDICTION CENTER NORMAN OK
0651 AM CST THU FEB 11 2010
AREAS AFFECTED...NORTH TX AND EXTREME SRN OK
CONCERNING...HEAVY SNOW
VALID 111251Z - 111645Z
LOCALLY HEAVY SNOW WILL OCCUR ACROSS MUCH OF NORTH TX THIS
MORNING...AT TIMES SNOW RATES WILL APPROACH 1" PER HOUR.
PERSISTENT MODEST LOW LEVEL WARM ADVECTION APPEARS TO BE MOSTLY
RESPONSIBLE FOR LARGE SCALE ASCENT AND MOISTENING ACROSS TX AHEAD OF
UPPER TROUGH. WIDESPREAD SNOW HAS NOW DEVELOPED ACROSS MUCH OF
NORTH TX...MAINLY NORTH OF I-20...WITH A FEW NARROW BANDS OF HEAVY
SNOW EMBEDDED. 12Z SOUNDINGS EXHIBIT PRONOUNCED VEERING PROFILES IN
THE LOWEST 3KM...ESPECIALLY AT FWD WHERE AIRMASS IS SATURATED
THROUGH THE LAYER OF ASCENT WITH PW VALUES APPROACHING .70 INCHES
ALONG SRN PERIPHERY OF SNOW SHIELD. ADDITIONALLY...LAPSE RATES ARE
QUITE STEEP ABOVE 700MB SUGGESTING CONVECTIVE ELEMENTS MAY
CONTRIBUTE TO HEAVIER BURSTS OF SNOW. WITH TIME MODERATE TO HEAVY
SNOW SHOULD SPREAD INTO EXTREME SRN OK BEFORE SHIFTING INTO EAST TX
AS UPPER TROUGH TRANSLATES DOWNSTREAM.
..DARROW.. 02/11/2010
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
...NOTICE...
SPC WINTER WEATHER MESOSCALE DISCUSSIONS WILL BE ISSUED ON A
SCHEDULED BASIS FROM DECEMBER 1 THROUGH FEBRUARY 28...FOUR
TIMES A DAY...AROUND 00 UTC...06 UTC...12 UTC...AND 18 UTC
FOR SIGNIFICANT SHORT RANGE WINTER WEATHER EVENTS.
ATTN...WFO...SHV...FWD...OUN...SJT...
LAT...LON 34049971 34269671 33289521 31829562 31879720 32519987
34049971
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