FNUS71 KAKQ 061259 FWSAKQ SPOT FORECAST FOR PINEY GROVE PRESERVE - UNIT 55...TNC NATIONAL WEATHER SERVICE WAKEFIELD VA 859 AM EDT FRI MAY 6 2011 FORECAST IS BASED ON IGNITION TIME OF 1100 EDT ON MAY 06. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION... HIGH PRESSURE WILL MOVE OFF THE COAST THIS MORNING...AS A WEAK DISORGANIZED AREA OF LOW PRESSURE APPROACHES FROM THE WEST...AND CROSSES THE REGION DURING THE LATE AFTERNOON AND EVENING. HIGH PRESSURE RETURNS LATER FRIDAY NIGHT AND SATURDAY. ANOTHER LOW PRESSURE SYSTEM MOVES ACROSS THE REGION SATURDAY NIGHT INTO SUNDAY. .TODAY... SKY/WEATHER.........MOSTLY SUNNY (30-40 PERCENT)...THEN BECOMING MOSTLY CLOUDY (65-75 PERCENT). SCATTERED SHOWERS AND THUNDERSTORMS LATE. MAX TEMPERATURE.....AROUND 76. MIN HUMIDITY........32 PERCENT. WIND (20FT/2MIN)....LIGHT WINDS...BECOMING SOUTHWEST 6 TO 12 MPH WITH GUSTS UP TO 25 MPH IN THE LATE MORNING AND AFTERNOON. GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS LATE. MIXING HEIGHT.......300 FT AGL...INCREASING TO 6100-7900 FT AGL. TRANSPORT WINDS.....SOUTH 7 TO 14 MPH...INCREASING TO SOUTHWEST 24 TO 28 MPH. VENTILATION RATE....VERY POOR TO POOR (1500-36300 FT-MPH)...INCREASING TO EXCELLENT (191100-212400 FT-MPH). TIME (EDT) 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM 8PM 9PM 10P SKY (%).........32 30 29 27 41 56 71 72 73 74 67 59 WEATHER COV..... SCT SCT SCT SCT SCT SCT WEATHER TYPE.... TSM TSM TSM TSM TSM TSM TEMP............67 69 71 73 74 75 74 73 69 64 62 59 RH..............43 40 36 34 33 33 34 37 44 54 58 67 20 FT WIND DIR..SW SW SW SW SW SW SW SW SW SW SW S 20 FT WIND SPD..10 10 11 11 11 10 10 9 8 6 5 4 20 FT WIND GUST.25 25 25 25 25 25 25 20 15 15 10 10 MIX HGT (KFT)...6.5 6.9 7.4 7.9 7.3 6.7 6.1 5.5 5.0 4.4 2.2 1.2 TRANSP WIND DIR.SW SW SW SW SW SW SW SW S S S S TRANSP WIND SPD.25 26 28 26 28 26 24 18 10 5 6 8 .TONIGHT... SKY/WEATHER.........MOSTLY CLOUDY (60-70 PERCENT)...THEN BECOMING PARTLY CLOUDY (25-35 PERCENT). SCATTERED SHOWERS AND THUNDERSTORMS IN THE EVENING. MIN TEMPERATURE.....AROUND 48. MAX HUMIDITY........100 PERCENT. WIND (20FT/2MIN)....SOUTHWEST WINDS 5 TO 10 MPH WITH GUSTS UP TO 20 MPH IN THE EVENING...BECOMING LIGHT. GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS IN THE EVENING. MIXING HEIGHT.......4400-5500 FT AGL...DECREASING TO 300-2200 FT AGL IN THE LATE EVENING AND OVERNIGHT. TRANSPORT WINDS.....SOUTHWEST 10 TO 18 MPH...BECOMING WEST 5 TO 10 MPH EARLY IN THE EVENING. VENTILATION RATE....GOOD (110600 FT-MPH)...DECREASING TO VERY POOR TO FAIR (1200-46900 FT-MPH). .SATURDAY... SKY/WEATHER.........SUNNY (20-30 PERCENT). MAX TEMPERATURE.....AROUND 76. MIN HUMIDITY........31 PERCENT. WIND (20FT/2MIN)....LIGHT WINDS...BECOMING WEST 5 TO 10 MPH IN THE LATE MORNING AND AFTERNOON. MIXING HEIGHT.......300 FT AGL...INCREASING TO 8900-9900 FT AGL. TRANSPORT WINDS.....NORTHWEST 7 TO 16 MPH...BECOMING WEST 15 TO 17 MPH IN THE AFTERNOON. VENTILATION RATE....VERY POOR (1600-28000 FT-MPH)...INCREASING TO EXCELLENT (115800-151900 FT-MPH). FORECASTER...ALBRIGHT REQUESTED BY...BOBBY CLONTZ TYPE OF REQUEST...PRESCRIBED .TAG 20110506.PINEY.01/AKQ