FNUS71 KLWX 241055
FWSLWX

SPOT FORECAST FOR ST MANASSAS CW150...NPS
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
655 AM EDT SUN JUL 24 2011

FORECAST IS BASED ON INCIDENT TIME OF 0647 EDT ON JULY 24.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 8 PM EDT THIS
EVENING...

.DISCUSSION...

TODAY WILL BE THE LAST DAY IN THE STRING OF STIFFLING HOT AND
HUMID WEATHER FOR THE MID ATLANTIC. ALTHOUGH IT WILL BE A LITTLE
CLOUDIER AND A COUPLE OF DEGREES COOLER...AFTERNOON TEMPERATURES
WILL STILL BE CLOSE TO RECORD HIGHS...AND THE HEAT INDEX WILL BE
HIGH ENOUGH TO POSSIBLY BE DANGEROUS.

A WEAK COLD FRONT WILL APPROACH FROM THE NORTH TODAY...STALL
ACROSS THE AREA TONIGHT THOUGH EARLY MONDAY...AND PUSH SOUTH OF
THE REGION BY MONDAY EVENING. SCATTERED TO NUMEROUS SHOWERS AND
THUNDERSTORMS WILL BE POSSIBLE TODAY AND TOMORROW...PRIMARILY
DURING THE AFTERNOON AND EVENING HOURS. THUNDERSTORMS WILL
CONTAIN VERY HEAVY RAIN AND STRONG GUSTY WINDS.

HIGH PRESSURE WILL BUILD BEHIND THE COLD FRONT TUESDAY...PROVIDING
MORE SEASONABLE TEMPERATURES TO THE MID ATLANTIC THROUGH
WEDNESDAY.

.TODAY...

SKY/WEATHER.........PARTLY SUNNY (50-60 PERCENT). A SLIGHT CHANCE
                    OF SHOWERS AND THUNDERSTORMS EARLY IN THE
                    MORNING...THEN A CHANCE OF SHOWERS AND
                    THUNDERSTORMS IN THE LATE MORNING AND
                    AFTERNOON.
MAX TEMPERATURE.....AROUND 97.
MIN HUMIDITY........45 PERCENT.
WIND (20 FT)........LIGHT AND VARIABLE WINDS...BECOMING NORTHWEST 5
                    TO 6 MPH EARLY IN THE MORNING. GUSTY AND
                    ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS.
CWR.................20 PERCENT...INCREASING TO 50 PERCENT.
HEAT INDEX..........RISING TO 100 DEGREES BY 11 AM...PEAKING CLOSE TO
                    105 DEGREES. IT WILL BE NEAR 105 BETWEEN 1-6 PM.

TIME (EDT)      6 AM   8 AM   10 AM  NOON   2 PM   4 PM
SKY (%).........50     51     57     60     64     61
WEATHER COV.....S CHC  S CHC  CHANCE CHANCE CHANCE CHANCE
WEATHER TYPE....RNSHWR RNSHWR RNSHWR RNSHWR RNSHWR RNSHWR
TEMP............79     82     88     93     95     95
RH..............82     77     61     51     46     46
20 FT WIND......NW 2   NW 4   NW 5   NW 5   NW 4   NW 4
20 FT WIND GUST.5      5      10     10     5      5
CWR.............20     20     30     30     50     50

.MONDAY...

SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT). A CHANCE OF
                    SHOWERS AND THUNDERSTORMS.
MAX TEMPERATURE.....AROUND 90.
MIN HUMIDITY........59 PERCENT.
WIND (20 FT)........LIGHT AND VARIABLE WINDS...BECOMING SOUTHWEST 5
                    TO 6 MPH IN THE AFTERNOON. GUSTY AND ERRATIC
                    WINDS EXPECTED NEAR THUNDERSTORMS.
CWR.................30 PERCENT...INCREASING TO 50 PERCENT.

TIME (EDT)      6 AM   8 AM   10 AM  NOON   2 PM   4 PM
SKY (%).........67     71     73     75     76     75
WEATHER COV.....CHANCE CHANCE CHANCE CHANCE CHANCE CHANCE
WEATHER TYPE....RNSHWR RNSHWR RNSHWR RNSHWR RNSHWR RNSHWR
TEMP............78     79     84     87     89     89
RH..............82     82     72     63     59     59
20 FT WIND......NW 2   NW 2   NW 2   SW 2   SW 5   SW 5
20 FT WIND GUST.5      5      5      5      10     10
CWR.............30     30     30     30     50     50

$$
FORECASTER...SILVERMAN
REQUESTED BY...SEABRIGHT
TYPE OF REQUEST...SAR
.TAG 20110724.STMAN.01/LWX