FNUS71 KAKQ 261134
FWSAKQ

SPOT FORECAST FOR LSA...VDOF
NATIONAL WEATHER SERVICE WAKEFIELD VA
734 AM EDT WED AUG 26 2009

FORECAST IS BASED ON IGNITION TIME OF 1100 EDT ON AUGUST 26.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
WEAK HIGH PRESSURE WILL BECOME CENTERED OFF THE COAST THIS
AFTERNOON...BRINGING A SOUTHERLY FLOW AND VERY WARMTEMPERATURES TO THE
REGION. A COLD FRONT SLOWLY DROPS INTO THE MID ATLANTIC REGION ON
THURSDAY...WHILE LOW PRESSURE OFF THE SOUTHEAST COAST BEGINS TO
TRACK NORTHWARD. THE FRONT REMAINS STATIONARY NEAR THE REGION
THROUGH THE WEEKEND...WHILE LOW PRESSURE TRACKS CLOSE TO THE MID
ATLANTIC COAST ON SATURDAY. LOCALLY HEAVY RAIN WILL BE POSSIBLE
LATER FRIDAY INTO SATURDAY...BEFORE THE LOW LIFTS OFF TO THE
NORTHEAST SATURDAY NIGHT AND SUNDAY.

.TODAY...

SKY/WEATHER.........SUNNY (15-25 PERCENT). PATCHY FOG EARLY IN THE
                    MORNING.
MAX TEMPERATURE.....AROUND 93.
MIN HUMIDITY........35 PERCENT.
WIND (20FT/2MIN)....LIGHT WINDS...BECOMING SOUTHWEST 5 TO 6 MPH
                    LATE IN THE MORNING.
MIXING HEIGHT.......300-1500 FT AGL...INCREASING TO 5700-7300 FT
                    AGL.
TRANSPORT WINDS.....SOUTHWEST 5 TO 9 MPH.
VENTILATION RATE....VERY POOR TO FAIR (1000-50600
                    FT-MPH)...INCREASING TO FAIR (56100 FT-MPH)
                    LATE.

TIME (EDT)      11A 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM 8PM 9PM 10P
SKY (%).........18  22  26  30  31  33  34  34  33  33  32  30
WEATHER COV.....
WEATHER TYPE....
TEMP............87  89  91  92  92  92  92  90  85  81  78  75
RH..............50  44  40  37  37  37  37  41  51  60  67  74
20 FT WIND DIR..W   SW  SW  SW  SW  SW  SW  SW  SW  SW  SW  S
20 FT WIND SPD..4   4   4   4   4   5   5   4   3   3   3   2
20 FT WIND GUST.10  10  10  10  10  10  10  10  5   5   5   5
MIX HGT (KFT)...5.7 6.2 6.7 7.3 7.1 6.9 6.8 4.6 2.4 0.3 0.3 0.3
TRANSP WIND DIR.NW  NW  W   W   W   W   SW  SW  SW  SW  SW  SW
TRANSP WIND SPD.8   8   7   7   7   8   9   10  12  13  12  10

.TONIGHT...

SKY/WEATHER.........PARTLY CLOUDY (25-35 PERCENT).
MIN TEMPERATURE.....AROUND 66.
MAX HUMIDITY........93 PERCENT.
WIND (20FT/2MIN)....SOUTHWEST WINDS AROUND 5 MPH EARLY IN THE
                    EVENING...BECOMING LIGHT.
MIXING HEIGHT.......4600 FT AGL...DECREASING TO 300 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 9 TO 13 MPH...BECOMING NORTH AFTER
                    MIDNIGHT.
VENTILATION RATE....VERY POOR TO POOR (1800-42100 FT-MPH).

.THURSDAY...

SKY/WEATHER.........MOSTLY SUNNY (35-45 PERCENT).
MAX TEMPERATURE.....AROUND 91.
MIN HUMIDITY........40 PERCENT.
WIND (20FT/2MIN)....LIGHT WINDS...BECOMING NORTHEAST 5 TO 6 MPH IN
                    THE LATE MORNING AND EARLY AFTERNOON...THEN
                    BECOMING LIGHT LATE. GUSTY AND ERRATIC WINDS
                    EXPECTED NEAR THUNDERSTORMS LATE.
MIXING HEIGHT.......300-2000 FT AGL...INCREASING TO 5100-6900 FT
                    AGL.
TRANSPORT WINDS.....EAST 3 TO 10 MPH...BECOMING SOUTH 2 TO 5 MPH IN
                    THE AFTERNOON.
VENTILATION RATE....VERY POOR (2100-27000 FT-MPH).



FORECASTER...BILLET
REQUESTED BY...CONLEY
TYPE OF REQUEST...PRESCRIBED
.TAG 20090826.LSA__.01/AKQ