FNUS72 KFFC 171154 FWSFFC SPOT FORECAST FOR 182_174...USFS NATIONAL WEATHER SERVICE PEACHTREE CITY GA 754 AM EDT SAT MAR 17 2012 FORECAST IS BASED ON IGNITION TIME OF 1030 EDT ON MARCH 17. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION... HIGH PRESSURE AT THE SURFACE AND ALOFT WILL RESULT IN A SUMMER LIKE PATTERN THROUGH THE WEEKEND. MARGINAL INSTABILITY DURING AFTERNOON HEATING WILL AID IN THE DEVELOPMENT OF SCATTERED AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS. AFTERNOON RH VALUES WILL REMAIN ABOVE CRITICAL THRESHOLDS THROUGH THE WEEKEND. .TODAY... SKY/WEATHER.........PARTLY SUNNY (50-60 PERCENT). SCATTERED SHOWERS AND THUNDERSTORMS...MAINLY IN THE AFTERNOON AND EVENING. MAX TEMPERATURE.....AROUND 85. MIN HUMIDITY........34 PERCENT. WIND (20 FT)........LIGHT WINDS BECOMING WEST 5 TO 7 MPH BY THE AFTERNOON. GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS. CWR.................50 PERCENT. MIXING HEIGHT.......0 FT AGL INCREASING TO 5200-6300 FT AGL EARLY IN THE MORNING. TRANSPORT WINDS.....WEST 8 TO 12 MPH DURING THE MORNING...THEN DECREASE TO AROUND 7 TO 10 MPH DURING THE AFTERNOON. THIS COUPLED WITH INCREASING LOW-MID CLOUDS WILL RESULT IN LOWERING DISPERSION INDEX VALUES IN THE AFTERNOON. DISPERSION INDEX....INCREASING TO 60 TO 65 BY LATE IN THE MORNING...THEN DECREASING TO 25 BY LATE IN THE AFTERNOON. LVORI...............4. TIME (EDT) 10 AM NOON 2 PM 4 PM SKY (%).........43 43 61 61 WEATHER COV.....S CHC S CHC CHANCE CHANCE WEATHER TYPE....RNSHWR RNSHWR TSTRM TSTRM TEMP............67 75 81 84 RH..............69 50 40 36 20 FT WIND......W 5 W 6 W 7 W 9 20 FT WIND GUST.7 9 10 15 DISPERSION IDX..60 63 28 25 LVORI...........2 1 2 2 CWR.............30 40 50 50 .TONIGHT... SKY/WEATHER.........MOSTLY CLOUDY (55-65 PERCENT). CHANCE OF SHOWERS AND THUNDERSTORMS UNTIL EARLY MORNING...THEN SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS AFTER MIDNIGHT. MIN TEMPERATURE.....AROUND 59. MAX HUMIDITY........83 PERCENT. WIND (20 FT)........WEST WINDS 5 TO 6 MPH EARLY IN THE EVENING BECOMING LIGHT. GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS. CWR.................50-40 PERCENT. MIXING HEIGHT.......6300 FT AGL DECREASING TO 0 FT AGL EARLY IN THE EVENING. TRANSPORT WINDS.....SOUTHWEST 2 TO 6 MPH. DISPERSION INDEX....15 DECREASING TO 1 BY LATE EVENING. LVORI...............3. TIME (EDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM SKY (%).........61 57 57 57 58 58 WEATHER COV.....CHANCE CHANCE CHANCE CHANCE S CHC S CHC WEATHER TYPE....TSTRM TSTRM RNSHWR RNSHWR RNSHWR RNSHWR TEMP............85 77 72 68 66 63 RH..............34 45 52 59 64 72 20 FT WIND......W 6 W 3 W 2 W 2 SW 1 SW 1 20 FT WIND GUST.10 6 5 5 DISPERSION IDX..15 2 1 1 1 0 LVORI...........2 2 3 3 3 4 CWR.............50 40 40 30 20 20 .SUNDAY... CWR.................20 PERCENT MORNING...INCREASING TO 30 PERCENT IN THE AFTERNOON. $$ FORECASTER...DARBE REQUESTED BY...TIM KOLNIK TYPE OF REQUEST...PRESCRIBED .TAG 20120317.182_1.01/FFC