FNUS72 KCHS 031342
FWSCHS

SPOT FORECAST FOR ONSLOW PILE...U.S. FISH AND WILDLIFE
NATIONAL WEATHER SERVICE CHARLESTON SC
942 AM EDT MON AUG 3 2009

FORECAST IS BASED ON IGNITION TIME OF 1000 EDT ON AUGUST 03.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
THE 12Z CHARLESTON UPPER AIR SOUNDING REVEALED AN AIRMASS PRIME FOR
SHOWERS/THUNDERSTORMS IN THE VICINITY OF THE BURN SITE JUST ABOUT
ANYTIME FROM LATE MORNING THROUGH EARLY EVENING. HOWEVER...BECAUSE OF
A PREVAILING WEST TO SOUTHWEST/OFFSHORE FLOW THE SEA BREEZE WILL
STRUGGLE TO DEVELOP AND PUSH INLAND THIS AFTERNOON...AND
THIS MAY DELAY THE ONSET OF SHOWERS/THUNDERSTORMS AND MAY LIMIT
COVERAGE...WITH OVERALL COVERAGE MOST LIKELY LESS THAN SUNDAY.
HOWEVER...ANY THUNDERSTORMS THAT DEVELOP WILL PRODUCE VERY HEAVY
RAIN...GUSTY/SHIFTING WINDS AND FREQUENT CLOUD TOP GROUND LIGHTNING.

.TODAY...

SKY/WEATHER.........PARTLY CLOUDY (45-55 PERCENT). SCATTERED SHOWERS
                    AND THUNDERSTORMS IN THE AFTERNOON.
MAX TEMPERATURE.....AROUND 90.
MIN HUMIDITY........59 PERCENT.
20 FT WINDS.........LIGHT AND VARIABLE WINDS...BECOMING SOUTHWEST 5
                    TO 8 MPH IN THE LATE MORNING AND AFTERNOON.
                    GUSTY AND ERRATIC WINDS EXPECTED NEAR
                    THUNDERSTORMS IN THE AFTERNOON.
MIXING HEIGHT.......500-2200 FT AGL...INCREASING TO 4700-6100 FT
                    AGL LATE IN THE MORNING.
TRANSPORT WINDS.....WEST 6 TO 14 MPH.

TIME (EDT)          10 AM  NOON   2 PM   4 PM
SKY COVER...........PCLDY  PCLDY  MCLDY  MCLDY
WEATHER COV.........       SCTTRD SCTTRD SCTTRD
WEATHER TYPE........NONE   RNSHWR TSTM   TSTM
TEMP................83     88     89     87
RH..................71     61     59     64
20 FT WIND..........W 4    W 5    W 6    SW 6
20 FT WIND GUST.....10     10     10     15

.TONIGHT...

SKY/WEATHER.........MOSTLY CLOUDY (55-65 PERCENT). A CHANCE OF
                    SHOWERS AND THUNDERSTORMS EARLY IN THE
                    EVENING...THEN A SLIGHT CHANCE OF SHOWERS AND
                    THUNDERSTORMS IN THE LATE EVENING AND EARLY
                    MORNING.
MIN TEMPERATURE.....AROUND 74.
MAX HUMIDITY........100 PERCENT.
20 FT WINDS.........SOUTHWEST WINDS 5 TO 7 MPH EARLY IN THE
                    EVENING...BECOMING LIGHT AND VARIABLE. GUSTY
                    AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS
                    UNTIL EARLY MORNING.
MIXING HEIGHT.......4700 FT AGL...DECREASING TO 0-700 FT AGL EARLY
                    IN THE EVENING.
TRANSPORT WINDS.....WEST 3 TO 10 MPH.

TIME (EDT)          6 PM   8 PM   10 PM  MIDNGT 2 AM   4 AM
SKY COVER...........MCLDY  MCLDY  MCLDY  MCLDY  MCLDY  MCLDY
WEATHER COV.........CHANCE CHANCE S CHC  S CHC
WEATHER TYPE........RNSHWR RNSHWR RNSHWR RNSHWR NONE   NONE
TEMP................84     80     79     77     76     74
RH..................73     82     86     92     94     100
20 FT WIND..........SW 6   S 4    SW 3   SW 2   SW 2   SW 2
20 FT WIND GUST.....15     10     5      5      5      5

.TUESDAY...

SKY/WEATHER.........PARTLY SUNNY (45-55 PERCENT).
MAX TEMPERATURE.....AROUND 93.
MIN HUMIDITY........52 PERCENT.
20 FT WINDS.........LIGHT AND VARIABLE WINDS...BECOMING SOUTH 5 TO
                    7 MPH IN THE AFTERNOON. GUSTY AND ERRATIC WINDS
                    EXPECTED NEAR THUNDERSTORMS EARLY IN THE
                    MORNING.
MIXING HEIGHT.......400 FT AGL...INCREASING TO 2600 FT AGL EARLY IN
                    THE MORNING...THEN INCREASING TO 4800-5600 FT
                    AGL LATE IN THE MORNING...DECREASING TO 3400 FT
                    AGL LATE.
TRANSPORT WINDS.....SOUTHWEST 5 TO 14 MPH.

$$
FORECASTER...ROWLEY
REQUESTED BY...JAN TRIPP
TYPE OF REQUEST...PRESCRIBED
.TAG 20090803.ONSLO.01/CHS