FNUS71 KLWX 231943
FWSLWX

SPOT FORECAST FOR 1ST MANASSAS...NPS
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
343 PM EDT SAT JUL 23 2011

FORECAST IS BASED ON INCIDENT TIME OF 1534 EDT ON JULY 23.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

...EXCESSIVE HEAT WARNING IN EFFECT UNTIL 8 PM EDT THIS EVENING...
...HEAT ADVISORY IN EFFECT FROM NOON TO 8 PM EDT SUNDAY...

.DISCUSSION...
OPPRESSIVE HEAT WILL CONTINUE THIS WEEKEND. AN EXCESSIVE HEAT WARNING CONTINUES
THIS EVENING FOR HEAT INDEX VALUES OF 110 TO 115. SCATTERED THUNDERSTORMS ARE
ALSO POSSIBLE THIS EVENING. SUNDAY WILL NOT BE QUITE AS HOT AS TODAY...HOWEVER
HEAT INDEX VALUES UP TO 105 ARE EXPECTED AND THEREFORE A HEAT ADVISORY HAS BEEN
ISSUED FOR SUNDAY. SCATTERED THUNDERSTORMS WILL REMAIN IN THE FORECAST THROUGH
MONDAY UNTIL A COLD FRONT MOVES THROUGH. HIGH PRESSURE WILL BUILD IN BY THE MIDDLE
OF NEXT WEEK AND PROVIDE MORE SEASONABLE TEMPERATURES TO THE REGION.

.TONIGHT...

SKY/WEATHER.........MOSTLY CLOUDY (60-70 PERCENT). A CHANCE OF
                    SHOWERS AND THUNDERSTORMS...MAINLY IN THE
                    EVENING.
MIN TEMPERATURE.....AROUND 76.
MAX HUMIDITY........82 PERCENT.
WIND (20 FT)........WEST WINDS AROUND 5 MPH EARLY IN THE
                    EVENING...BECOMING LIGHT AND VARIABLE...THEN
                    BECOMING NORTHWEST 5 TO 6 MPH LATE IN THE
                    EVENING. GUSTY AND ERRATIC WINDS EXPECTED NEAR
                    THUNDERSTORMS.
CWR.................40 PERCENT...DECREASING TO 20 PERCENT.
HEAT INDEX..........110 TO 115 THROUGH 6 PM THIS EVENING...105 TO 110 THROUGH
                    8 PM THIS EVENING...THEN AROUND 100 BY 10 PM.

TIME (EDT)      6 PM   8 PM   10 PM  MIDNGT 2 AM   4 AM
SKY (%).........63     66     62     62     63     59
WEATHER COV.....CHANCE CHANCE CHANCE S CHC  S CHC  S CHC
WEATHER TYPE....RNSHWR RNSHWR RNSHWR RNSHWR RNSHWR RNSHWR
TEMP............96     91     86     83     81     80
RH..............48     56     68     74     77     77
20 FT WIND......W 4    W 2    NW 3   NW 4   NW 5   NW 4
20 FT WIND GUST.10     5      5      10     10     10
CWR.............40     40     30     20     20     20

.SUNDAY...

SKY/WEATHER.........PARTLY SUNNY (60-70 PERCENT). A CHANCE OF
                    SHOWERS AND THUNDERSTORMS...MAINLY IN THE
                    AFTERNOON.
MAX TEMPERATURE.....AROUND 97.
MIN HUMIDITY........45 PERCENT.
WIND (20 FT)........NORTHWEST WINDS 5 TO 6 MPH...BECOMING LIGHT AND
                    VARIABLE. GUSTY AND ERRATIC WINDS EXPECTED NEAR
                    THUNDERSTORMS.
CWR.................20 PERCENT...INCREASING TO 40 PERCENT.

TIME (EDT)      6 AM   8 AM   10 AM  NOON   2 PM   4 PM
SKY (%).........57     57     59     62     69     68
WEATHER COV.....S CHC  S CHC  S CHC  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 4   NW 4   NW 5   NW 5   NW 4   NW 4
20 FT WIND GUST.5      10     10     10     10     5
CWR.............20     20     20     40     40     40

$$
FORECASTER...PELOQUIN
REQUESTED BY...SEABRIGHT
TYPE OF REQUEST...SAR
.TAG 20110723.1STMA.02/LWX