FNUS73 KUNR 192122
FWSUNR

SPOT FORECAST FOR SUNDANCE RX UNIT 18...USFS
NATIONAL WEATHER SERVICE RAPID CITY SD
322 PM MDT SUN SEP 19 2010

FORECAST IS BASED ON IGNITION TIME OF 0900 MDT ON SEPTEMBER 20.
IF CONDITIONS BECOME UNREPRESENTATIVE CONTACT THE
NATIONAL WEATHER SERVICE OFFICE IN RAPID CITY.

...FRONTAL PASSAGE MONDAY...

.DISCUSSION...BREEZY SOUTH TO SOUTHWESTERLY WINDS ARE EXPECTED
OVER THE BURN SITE TONIGHT INTO MONDAY MORNING AHEAD OF AN APPROACHING
COLD FRONT. AS THE COLD FRONT PASSES LATE MONDAY MORNING INTO EARLY
AFTERNOON...WINDS WILL SWITCH NORTHWEST AND REMAIN BREEZY. THERE IS SOME
QUESTION WITH HIGH TEMPERATURES AND MINIMUM RELATIVE HUMIDITY VALUES
AS THESE WILL BE HIGHLY DEPENDENT ON THE TIMING OF FRONTAL PASSAGE. SOME
SHOWERS AND THUNDERSTORMS MAY ALSO DEVELOP ON MONDAY.

NEAR AVERAGE TEMPERATURES ARE EXPECTED THROUGH MID-WEEK WITH THE NEXT
CHANCE FOR THUNDERSTORMS COMING WEDNESDAY INTO THURSDAY.

.TONIGHT...
SKY/WEATHER.........PARTLY CLOUDY.
TEMPERATURE.........MIN 54.
RH..................MAX 55 PERCENT.
WIND (20 FT)........SOUTH WINDS 13 TO 22 MPH SHIFTING TO THE
                    SOUTHWEST 15 TO 23 MPH AFTER MIDNIGHT.
CWR.................0 PERCENT.
LAL.................1.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......100 TO 600 FT AGL.
TRANSPORT WINDS.....SOUTH 22 TO 24 MPH.
SMOKE DISPERSAL.....POOR.

.MONDAY...
SKY/WEATHER.........MOSTLY SUNNY. SLIGHT CHANCE OF SHOWERS AND
                    THUNDERSTORMS.
TEMPERATURE.........MAX 74.
RH..................MIN 22 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 16 TO 18 MPH SHIFTING TO THE
                    NORTHWEST 15 TO 20 MPH LATE IN THE MORNING.
CWR.................9 PERCENT.
LAL.................1.
HAINES INDEX........6 OR HIGH POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......4700 TO 5700 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 20 TO 25 MPH BECOMING NORTHWEST LATE
                    IN THE MORNING.
SMOKE DISPERSAL.....FAIR INCREASING TO VERY GOOD.

$$
FORECASTER...JS
REQUESTED BY...BKF CREW 1
TYPE OF REQUEST...PRESCRIBED
.TAG 20100920.SUNDA.01/UNR