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MESOSCALE DISCUSSION 0162
NWS STORM PREDICTION CENTER NORMAN OK
1125 AM CST FRI FEB 27 2009
AREAS AFFECTED...S CNTRL SD/N CNTRL AND ERN NEB
CONCERNING...HEAVY SNOW
VALID 271725Z - 272130Z
OCCASIONAL MODERATE TO HEAVY SNOWFALL HAS BEEN OBSERVED RECENTLY
ACROSS S CNTRL SD AND N CNTRL NEB. EXPECT A GENERAL INCREASE IN
COVERAGE THROUGH THE AFTERNOON AS SNOW SHIFTS SEWD THROUGH S CNTRL
SD...N CNTRL NEB...AND INTO ERN NEB. SNOWFALL RATES NEAR 1 TO 2
INCHES AN HOUR WILL BE POSSIBLE IN THE HEAVIEST SNOW...ALONG WITH
REDUCED VISIBILITIES.
A STRONG SHORT WAVE TROUGH...CURRENTLY NEAR THE ERN MT/NERN WY
BORDERS...WILL CONTINUE TO MOVE SEWD INTO WRN SD/NEB PROVIDING
FAVORABLE JET DYNAMICS FOR INCREASING SNOWFALL THROUGH THE
AFTERNOON. RADAR IMAGERY SHOWS A NW TO SE ORIENTED SWATH OF MODERATE
TO HEAVY SNOWFALL AHEAD OF A SURFACE LOW LOCATED IN CNTRL CO. THE
SURFACE LOW WILL DEVELOP SSEWD THROUGH THE DAY. AS THIS
OCCURS...ISENTROPIC LIFT WILL BECOME ALIGNED FAVORABLY WITH
INCREASING UPPER DIVERGENCE ACROSS CNTRL NEB...BEFORE MOVING SEWD
INTO ERN NEB. INITIAL 12Z SOUNDINGS REFLECTED A VERY DRY ARCTIC
AIRMASS. HOWEVER...GOES PWAT IMAGERY IN ADDITION TO WV INDICATES
SLOW MOISTURE RETURN IN SELY LOW LEVEL FLOW...WITH THE MOIST AXIS
THROUGH CNTRL/ERN NEB AND THE NOSE JUST REACHING INTO CNTRL SD. THIS
IN COMBINATION WITH ONGOING SNOWFALL WILL SLOWLY CONTINUE TO
SATURATE LOW LEVELS. ADDITIONALLY...ELONGATED ISOTHERMAL LAYER JUST
ABOVE THE SURFACE THROUGH APPROXIMATELY 750 MB BENEATH DENDRITIC
GROWTH LAYER WILL BE FAVORABLE FOR MODERATE TO HEAVY SNOWFALL.
..HURLBUT.. 02/27/2009
ATTN...WFO...FSD...OAX...ABR...GID...LBF...UNR...
LAT...LON 41939636 41079670 40659803 40829936 41640074 42810173
44000164 44770049 44419806 42799655 41939636
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