National Weather Service Forecast for Lawrenceville and Gwinnett County
Lat: 33.95N, Lon: 83.99W Wx Zone: GAZ034
Area Forecast Discussion000 FXUS62 KFFC 262359 AFDFFC AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PEACHTREE CITY GA 659 PM EST SUN DEC 26 2010 .PREV DISCUSSION... /ISSUED 411 PM EST SUN DEC 26 2010/ SHORT TERM /TONIGHT THROUGH TUESDAY NIGHT/... LINGERING SNOW SHOWERS STILL AFFECTING MUCH OF THE CWA TODAY. 850MB TEMPS THIS MORNING WERE -11C AT FFC AND BMX...MORE THAN SUFFICIENT FOR STEEP LAPSE RATES AND CONVECTIVE PRECIP. SOME LIGHT ACCUMULATIONS /LESS THAN 0.5 INCH/ DID OCCUR THIS MORNING IN EAST CENTRAL GA WHERE SOME VSBYS WENT BELOW 1SM AT TIMES. EXPECT SNOW SHOWERS AND SOME OF THE STRATOCU TO DISSIPATE TONIGHT AS WE LOSE SOLAR INSOLATION BUT FLURRIES OR LIGHT SNOW SHOWERS WILL LINGER IN AND NEAR NE GA MOUNTAINS DUE TO UPSTREAM UPSLOPE IN SRN APPS. WINDS SHOULD BE GUSTY IN THE NE GA MOUNTAINS AS WELL BUT NOT ENOUGH FOR MEETING ADVISORY THRESHOLD. REMAINING PERIODS LOOK MOSTLY CLEAR WITH VERY COLD CONDITIONS. NW FLOW WILL PERSIST THROUGH TUES.USED BLEND OF BIAS-ADJUSTED MAV/MET GUIDANCE. ADJUSTED MONDAY MAX TEMP DOWN A TAD. LONG TERM /WEDNESDAY THROUGH SUNDAY/... LARGE/DEEP UPPER TROUGH STILL PROGGED TO PUSH INTO THE WESTERN CONUS LATER THIS WEEK WHILE UPPER RIDGE AXIS BUILDS IN THE EAST. RIDGE AXIS SLOW TO PUSH EAST OF 85 LONGITUDE SO SHOULD SEE SFC HIGH BUILD DOWN EAST OF THE APPALACHIANS. THIS MAY LIMIT HOW MUCH WARMING /PARTICULARLY NIGHTTIME TEMPS/ WE WOULD NORMALLY GET WITH SFC/ALOFT SW FLOW. ONE FAIRLY WEAK SHORT WAVE TO MOVE NE OVER THE SOUTH ON THURSDAY...SIMILAR TIMING ON 12Z GFS AND ECMWF. ONLY LIGHT PRECIP POSSIBLE WITH THIS AND SHOULD REMAIN LIQUID. LOW LEVELS MAY BE COOL/DRY BUT NOT ENOUGH TO SPIT OUT ANY LIGHT SLEET OR FREEZING RANI. WAY TOO WARM ALOFT FOR SNOW. AFTER THIS SW FLOW ALOFT STRENGTHENS WITH SOME SORT OF WAVE PASSING THROUGH SAT /GFS/ OR SUN /ECMWF/. OTHER THAN RAIN...WITH JUST A LITTLE MORE CAPE... THIS SYSTEM COULD PRODUCE SEVERE WEATHER. LATEST FCST LOOKS GOOD. SNELSON AVIATION... 00Z UPDATE... WRAP AROUND MOISTURE STILL PRODUCING LIGHT FLURRIES ACROSS N GA THIS EVENING. THESE FLURRIES SHOULD COME TO AN END OVER THE NEXT 2-4 HOURS AS DRIER AIR BEGINS TO MOVE INTO WEST GA. CEILINGS AND VSBYS ARE IN THE MVFR-VFR RANGE AND THEY SHOULD IMPROVE TO VFR AFTER 04-06Z WINDS ARE OUT OF THE NW AND SHOULD STAY THERE THROUGH THE PERIOD. WIND SPEEDS WILL ALSO STAY IN THE 11-16KT RANGE GUSTING 20-30KTS THROUGH 00Z TUE. WINDS WILL SLOWLY TAPPER OFF AFTER THAT. NO PRECIPITATION...CEILINGS OR RESTRICTIONS TO VSBYS EXPECTED AFTER 08Z-10Z MON. //ATL CONFIDENCE...00Z UPDATE... CONFIDENCE IS HIGH IN ALL ELEMENTS. 01 && .PRELIMINARY POINT TEMPS/POPS... ATHENS 20 39 20 46 / 10 5 0 5 ATLANTA 20 38 22 45 / 10 0 0 5 BLAIRSVILLE 18 30 16 40 / 20 0 0 5 CARTERSVILLE 21 36 20 43 / 10 0 0 5 COLUMBUS 22 45 23 51 / 5 0 0 5 GAINESVILLE 20 36 22 46 / 10 5 0 5 MACON 23 45 21 50 / 5 0 0 5 ROME 21 35 19 42 / 10 0 0 5 PEACHTREE CITY 20 40 18 46 / 10 0 0 5 VIDALIA 24 44 23 50 / 5 0 0 5 && .FFC WATCHES/WARNINGS/ADVISORIES... NONE. && $$ |