FNUS73 KUNR 052159
FWSUNR

SPOT FORECAST FOR PCK RX...SD-BKF
NATIONAL WEATHER SERVICE RAPID CITY SD
359 PM MDT TUE MAY 5 2009

FORECAST IS BASED ON IGNITION TIME OF 1100 MDT ON MAY 06.
IF CONDITIONS BECOME UNREPRESENTATIVE CONTACT THE
NATIONAL WEATHER SERVICE OFFICE IN RAPID CITY.

.DISCUSSION...
A FAST-MOVING STORM SYSTEM WILL TRACK ACROSS THE AREA
TONIGHT...BRINGING ISOLATED TO SCATTERED SHOWERS AND
THUNDERSTORMS. RAINFALL AMOUNTS WILL BE LESS THAN A TENTH OF AN
INCH. A COLD FRONT WILL PASS THROUGH THE AREA AROUND MIDNIGHT.
THIS WILL SWITCH THE WINDS TO THE NORTHWEST...GUSTY AT TIMES.
WINDS WILL DIMINISH WEDNESDAY MORNING...BECOMING TERRAIN-DRIVEN BY
AFTERNOON. ANOTHER FAST-MOVING STORM SYSTEM WILL BRING ANOTHER
BATCH OF SHOWERS AND THUNDERSTORMS WEDNESDAY AFTERNOON AND
EVENING.

.TONIGHT...

SKY/WEATHER.........PARTLY CLOUDY THEN BECOMING MOSTLY CLOUDY.
                    CHANCE OF SHOWERS AND THUNDERSTORMS...MAINLY
                    BEFORE 300 AM.
TEMPERATURE.........MIN 39.
RH..................MAX 70 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING WEST 5 TO 10 MPH EARLY IN
                    THE EVENING...THEN SHIFTING TO THE NORTHWEST 13
                    TO 17 MPH AFTER MIDNIGHT.
CWR.................11 PERCENT.
LAL.................3 UNTIL 2400...THEN 1.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......100 TO 600 FT AGL.
TRANSPORT WINDS.....NORTHWEST 12 TO 21 MPH INCREASING TO 23 TO 26
                    MPH AFTER MIDNIGHT.
SMOKE DISPERSAL.....POOR.

.WEDNESDAY...

SKY/WEATHER.........PARTLY SUNNY. SLIGHT CHANCE OF SHOWERS AND
                    THUNDERSTORMS IN THE AFTERNOON.
TEMPERATURE.........54 AT IGNITION...MAX 61.
RH..................41 PERCENT AT IGNITION...MIN 32 PERCENT.
WIND (20 FT)........WINDS WEST AT 8 TO 12 MPH AT IGNITION...OTHERWISE
                    BECOMING UPSLOPE 6 TO 10 MPH. PERIODIC GUSTS TO 18
                    MPH AFTER THE ATMOSPHERE MIXES OUT.
CWR.................6 PERCENT.
LAL.................1 UNTIL 1200...THEN 2.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......7200 TO 8200 FT AGL.
TRANSPORT WINDS.....WEST 20 TO 28 MPH DECREASING TO AROUND 17 MPH
                    LATE IN THE AFTERNOON.
SMOKE DISPERSAL.....FAIR INCREASING TO VERY GOOD.

$$
FORECASTER...MB
REQUESTED BY...DIV 1
TYPE OF REQUEST...PRESCRIBED
.TAG 20090506.PCKRX.01/UNR