Saturday, February 28, 2009

Now THIS is what I'm talking about, snow fans!


   MESOSCALE DISCUSSION 0175    NWS STORM PREDICTION CENTER NORMAN OK    1147 AM CST SAT FEB 28 2009        AREAS AFFECTED...SERN MO...NERN AR...WRN TN/KY        CONCERNING...HEAVY SNOW         VALID 281747Z - 282145Z        MODERATE TO HEAVY SNOW HAS OCCASIONALLY BEEN OBSERVED ACROSS S CNTRL    MO OVER THE PAST FEW HOURS...WITH A RECENT REPORT OF 2 INCHES AN    HOUR AT FT WOOD. ANTICIPATE THIS TREND TO CONTINUE ESEWD TOWARD SERN    MO...NERN AR...AND WRN TN/KY. RATES OF NEAR 1 TO 2 INCHES AN HOUR    CAN BE EXPECTED IN HEAVIER SNOWFALL IN ADDITION TO RESTRICTED    VISIBILITIES.         A VIGOROUS UPPER LOW...CURRENTLY LOCATED OVER ERN KS...WILL QUICKLY    DIVE SEWD REACHING CNTRL AR BY 00Z. AT THE SURFACE...STRONG ARCTIC    HIGH PRESSURE IS QUICKLY BUILDING ACROSS THE CNTRL STATES...AND    SUBFREEZING TEMPERATURES WILL REMAIN ACROSS THE OUTLINE AREA WHILE    AREAS TO THE SOUTH AND EAST WILL QUICKLY COOL THROUGH THE AFTERNOON    IN STRONG COLD AIR ADVECTION. A NW TO SE ORIENTED BAND OF MDT/HVY    SNOW IS OCCURRING AHEAD OF THE UPPER LOW...WITH ADDITIONAL    DEVELOPMENT BEGINNING INTO SERN MO...WRN KY/TN...AND NERN AR ALONG    AN INVERTED SURFACE TROUGH AXIS AND IN CONJUNCTION WITH STRONG UPPER    DIVERGENCE/FAVORABLE JET DYNAMICS. SUBTLE ISENTROPIC LIFT IS    CONTRIBUTING AS WELL...WITH RELATIVE WARM/MOIST AIR TO THE EAST    BEING DRAWN ATOP THE ARCTIC AIRMASS/SUBFREEZING TEMPERATURES TO THE    WEST. THIS IS REFLECTED WELL IN RECENT PADUCAH VAD WIND PROFILES.    12Z SPRINGFIELD SOUNDING SHOWS SATURATED COLUMN GENERALLY FROM THE    SURFACE THROUGH 500 MB...AND MODEL SOUNDINGS ARE INDICATIVE THAT    AREAS IMMEDIATELY DOWNSTREAM WILL REMAIN SATURATED AS    WELL...PROMOTING MDT/HVY SNOW. EXPECT THIS TREND TO GENERALLY SHIFT    ESEWD IN CONJUNCTION WITH THE MOVEMENT OF THE UPPER LOW.        ..HURLBUT.. 02/28/2009

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