FNUS73 KUNR 081532
FWSUNR

SPOT FORECAST FOR OLD GROWTH PILE BURNING...NATIONAL PARK SERVICE
NATIONAL WEATHER SERVICE RAPID CITY SD
932 AM MDT THU OCT 8 2009

FORECAST IS BASED ON IGNITION TIME OF 1100 MDT ON OCTOBER 08.
IF CONDITIONS BECOME UNREPRESENTATIVE CONTACT THE
NATIONAL WEATHER SERVICE OFFICE IN RAPID CITY.

.DISCUSSION...
A COLD WEATHER PATTERN WILL PERSIST OVER THE AREA THOUGH THIS
WEEKEND...WITH A REINFORCING SHOT OF COLD AIR BLASTING THROUGH THE
AREA ON FRIDAY. FOR TODAY THERE WILL BE CONSIDERABLE CLOUDS WITH
ISOLATED SNOW SHOWERS. THERE WILL BE A LULL IN THE ACTIVITY LATE
TONIGHT AND EARLY FRIDAY...BUT THEN ANOTHER ROUND OF SNOW SHOWERS
IS EXPECTED FRIDAY AFTERNOON. THE WINDS WILL BECOME RATHER GUSTY
WITH THE FRONTAL PASSAGE AROUND 900 AM...WITH BREEZY CONDITIONS
LASTING THROUGH FRIDAY NIGHT...PRODUCING WIND CHILL VALUES NEAR
ZERO. ADDITIONAL SNOWFALL WILL BE MINIMAL...ONLY A FEW INCHES.

.TODAY...

SKY/WEATHER.........PARTLY SUNNY. SLIGHT CHANCE OF SNOW SHOWERS.
TEMPERATURE.........32 AT IGNITION...MAX 35.
RH..................62 PERCENT AT IGNITION...MIN 52 PERCENT.
WIND (20 FT)........WINDS NORTH AT 5 TO 9 MPH AT IGNITION...
                    BECOMING VARIABLE 2 TO 6 MPH BY NOON.
CWR.................16 PERCENT.
LAL.................1.
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......4100 TO 5100 FT AGL.
TRANSPORT WINDS.....NORTH 3 TO 12 MPH.
SMOKE DISPERSAL.....POOR.

.TONIGHT...

SKY/WEATHER.........MOSTLY CLOUDY. SLIGHT CHANCE OF SNOW IN THE
                    EVENING.
TEMPERATURE.........MIN 21.
RH..................MAX 88 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 5 TO 6 MPH UNTIL EARLY MORNING
                    BECOMING LIGHT.
CWR.................15 PERCENT.
LAL.................1.
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......400 TO 900 FT AGL.
TRANSPORT WINDS.....SOUTH 3 TO 8 MPH.
SMOKE DISPERSAL.....POOR.

.FRIDAY...

SKY/WEATHER.........MOSTLY CLOUDY. CHANCE OF SNOW IN THE
                    MORNING...THEN SNOW LIKELY IN THE AFTERNOON.
TEMPERATURE.........MAX 30.
RH..................MIN 66 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING NORTH 6 TO 15 MPH...WITH
                    SOME GUSTS TO 25 MPH.
CWR.................34 PERCENT.
LAL.................1.
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......2500 TO 3500 FT AGL.
TRANSPORT WINDS.....WEST 6 TO 15 MPH INCREASING TO NORTH 18 TO 26
                    MPH IN THE LATE MORNING AND AFTERNOON.
SMOKE DISPERSAL.....FAIR INCREASING TO GOOD IN THE AFTERNOON.

$$
FORECASTER...MB
REQUESTED BY...AL STOVER
TYPE OF REQUEST...PRESCRIBED
.TAG 20091008.OLDGR.01/UNR