FNUS73 KUNR 072131
FWSUNR

SPOT FORECAST FOR PEARSON SPRING...SD-BKF
NATIONAL WEATHER SERVICE RAPID CITY SD
331 PM MDT FRI AUG 7 2009

FORECAST IS BASED ON REQUEST TIME OF 1517 MDT ON AUGUST 07.
IF CONDITIONS BECOME UNREPRESENTATIVE CONTACT THE
NATIONAL WEATHER SERVICE OFFICE IN RAPID CITY.

.DISCUSSION...
A COLD FRONT ACROSS MONTANA WILL MOVE THROUGH NORTHEAST WYOMING TONIGHT.
MEANWHILE...AN UPPER LEVEL DISTURBANCE WILL CROSS THE NORTHERN PLAINS
RESULTING IN WIDESPREAD SHOWERS AND THUNDERSTORMS. THE THUNDERSTORMS
THIS EVENING MAY PRODUCE FREQUENT LIGHTNING...LARGE HAIL...AN VERY
STRONG WINDS. WINDS WILL BE VARIABLE THIS EVENING...THEN SHIFTING TO
THE NORTHWEST AROUND MIDNIGHT.

.TONIGHT...

SKY/WEATHER.........MOSTLY CLOUDY. SCATTERED THUNDERSTORMS IN THE
                    EVENING...THEN NUMEROUS SHOWERS AND
                    THUNDERSTORMS AFTER MIDNIGHT.
MIN TEMPERATURE.....AROUND 58.
MAX HUMIDITY........80-85 PERCENT.
WIND (20 FT)........VARIABLE 3 TO 6 MPH BECOMING NORTHWEST 12 TO TO 15 MPH
                    AROUND MIDNIGHT. WINDS WILL BE ERRATIC AND GUSTY WITH
                    THUNDERSTORMS.
CWR.................45 PERCENT.
LAL.................4.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......8000-9000 THROUGH THE EVENING...THEN DECREASING TO
                    800 TO 1300 FT AGL OVERNIGHT.
TRANSPORT WINDS.....SOUTHWEST 15 TO 20 MPH BECOMING NORTHWEST.
SMOKE DISPERSAL.....GOOD THIS EVENING BECOMING POOR.

.SATURDAY...

SKY/WEATHER.........MOSTLY CLOUDY IN THE MORNING...THEN DECREASING CLOUDS.
                    SHOWERS AND THUNDERSTORMS LIKELY IN THE MORNING...THEN
                    CHANCE OF SHOWERS AND THUNDERSTORMS IN THE AFTERNOON.
MAX TEMPERATURE.....AROUND 71.
MIN HUMIDITY........48-52 PERCENT.
WIND (20 FT)........NORTHWEST WINDS 10 TO 15 MPH.
CWR.................50 PERCENT.
LAL.................4.
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......4200 TO 5200 FT AGL.
TRANSPORT WINDS.....NORTHWEST AROUND 30 MPH.
SMOKE DISPERSAL.....VERY GOOD.

$$
FORECASTER...NWS
REQUESTED BY...BKF 381
TYPE OF REQUEST...WILDFIRE
.TAG 20090807.PEARS.01/UNR