FNUS71 KAKQ 151423 FWSAKQ SPOT FORECAST FOR HERTFORD COUNTY...NCFS NATIONAL WEATHER SERVICE WAKEFIELD VA 923 AM EST SUN FEB 15 2009 FORECAST IS BASED ON IGNITION TIME OF 0850 EST ON FEBRUARY 15. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION... WEAK HIGH PRESSURE BUILDS ACROSS THE AREA TODAY. A TROUGH OF LOW PRESSURE MOVES ACROSS NORTH CAROLINA TONIGHT AND MONDAY MORNING. CANADIAN HIGH PRESSURE RETURNS MONDAY AFTERNOON THROUGH TUESDAY NIGHT. LOW PRESSURE APPROACHES FROM THE WEST WEDNESDAY. .TODAY... SKY/WEATHER.........MOSTLY SUNNY (35-45 PERCENT)...THEN BECOMING PARTLY TO MOSTLY CLOUDY (70-80 PERCENT). TEMPERATURE.........41 AT IGNITION...MAX 50. RH..................63 PERCENT AT IGNITION...MIN 34 PERCENT. WIND (20FT/2MIN)....WINDS NORTH AT 8 TO 15 MPH AT IGNITION...OTHERWISE NORTHEAST WINDS 10 TO 15 MPH. MIXING HEIGHT.......2600 FT AGL AT IGNITION...INCREASING TO 2800-4000 FT AGL IN THE AFTERNOON. TRANSPORT WINDS.....NORTH 10 TO 15 MPH. VENTILATION RATE....VERY POOR /29800 FT-MPH/ AT IGNITION. MAX...POOR /39000 FT-MPH/. TIME (EST) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM SKY (%).........23 28 33 38 44 51 59 67 75 82 90 91 WEATHER COV..... WEATHER TYPE.... TEMP............41 43 44 46 47 48 50 50 48 44 41 38 RH..............67 59 51 47 42 38 38 37 43 50 59 64 20 FT WIND DIR..N N N N N N N NE NE NE NE NE 20 FT WIND SPD..10 10 10 10 9 9 8 6 5 5 5 4 20 FT WIND GUST.17 15 15 15 12 12 12 10 10 10 10 5 MIX HGT (KFT)...2.6 3.1 3.3 3.6 3.8 3.9 3.9 4.0 4.0 2.8 1.5 0.3 MIXNG WIND DIR..N N N N N N N N N N N N MIXNG WIND SPD..15 15 15 14 13 10 9 8 7 6 6 6 .TONIGHT... SKY/WEATHER.........CLOUDY (85-95 PERCENT). A SLIGHT CHANCE OF SNOW SHOWERS AFTER MIDNIGHT. TEMPERATURE.........MIN 32. RH..................MAX 82 PERCENT. WIND (20FT/2MIN)....NORTHEAST WINDS AROUND 5 MPH EARLY IN THE EVENING...BECOMING LIGHT AND VARIABLE. MIXING HEIGHT.......300-1500 FT AGL. TRANSPORT WINDS.....NORTHEAST 3 TO 9 MPH. VENTILATION RATE....VERY POOR (800-7400 FT-MPH). .PRESIDENTS DAY... SKY/WEATHER.........PARTLY SUNNY (55-65 PERCENT)...THEN BECOMING SUNNY (15-25 PERCENT). TEMPERATURE.........MAX 45. RH..................MIN 36 PERCENT. WIND (20FT/2MIN)....NORTH WINDS 5 TO 10 MPH. MIXING HEIGHT.......1300-2600 FT AGL...INCREASING TO 5600-7200 FT AGL. TRANSPORT WINDS.....NORTHWEST 8 TO 17 MPH...INCREASING TO 18 TO 21 MPH LATE. VENTILATION RATE....VERY POOR TO FAIR (9200-50300 FT-MPH)...INCREASING TO EXCELLENT (115800-119700 FT-MPH). FORECASTER...FOSTER REQUESTED BY...DISTRICT 7 OPS OFFICER TYPE OF REQUEST...PRESCRIBED .TAG 20090215.HERTF.01/AKQ