NOAA. 9:59 Discussion Update... NATIONAL WEATHER SERVICE HUNTSVILLE AL 959 PM CST FRI JAN 23 2015 .UPDATE... FOR APPROACHING WINTRY PRECIPITATION. && .DISCUSSION... AN AREA OF PRECIPITATION ON THE FORWARD FLANK OF AN APPROACHING UPPER TROUGH IS JUST NOW ENTERING NW AL. KGWX RADAR IMAGERY INDICATES WHAT APPEARS TO BE A CONVECTIVE BAND MOVING ACROSS FRANKLIN/MARION COUNTIES (AL) AND ANOTHER ONE CLOSE TO KGWX. MODEL OUTPUT AND ANALYSIS PRODUCTS DO INDICATE A DEFORMATION AXIS JUST AHEAD OF THE LEADING EDGE OF PRECIP. THIS IS PERHAPS THE REASON FOR THE ISOLATED ENHANCEMENT ALONG THE LEADING EDGE OF PRECIP. AREA SOUNDINGS DO SHOW A SATURATED PROFILE CLOSE TO FREEZING FROM THE SFC TO ~500 MB. THIS ALONG WITH THE CONVECTIVE BANDING WILL LIKELY TRANSLATE TO LARGE SNOWFLAKES FALLING WITH THESE BANDS. HAVE RECEIVED REPORTS OF LARGE SNOWFLAKES AND SLEET FURTHER WEST OVER N MS AND OVER PORTIONS OF WESTERN COLBERT COUNTY. HOWEVER, WITH SFC TEMPERATURES STILL HOLDING IN THE UPPER 30S TO LOW 40S AND THE QUICK MOVEMENT OF THE PRECIPITATION, ACCUMULATIONS STILL LOOK TO BE LESS THAN 0.5 INCHES. HAVE UPDATED THE FORECAST TO REFLECT THE TYPE OF PRECIPITATION ALONG WITH A TWEAK TO THE SNOW ACCUMULATION FORECAST TO INDICATE A POSSIBLE LIGHT ACCUMULATION (
Posted on: Sat, 24 Jan 2015 04:26:18 +0000
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