FNUS73 KUNR 171317
FWSUNR

SPOT FORECAST FOR PICNIC RX...NATIONAL PARK SERVICE
NATIONAL WEATHER SERVICE RAPID CITY SD
717 AM MDT THU SEP 17 2009

FORECAST IS BASED ON IGNITION TIME OF 1100 MDT ON SEPTEMBER 17.
IF CONDITIONS BECOME UNREPRESENTATIVE CONTACT THE
NATIONAL WEATHER SERVICE OFFICE IN RAPID CITY.

.DISCUSSION...HIGH PRESSURE WILL CONTINUE TO BRING QUIET WEATHER
TO THE REGION THROUGH SATURDAY. THE MAIN CONCERN CONTINUES TO BE
SMOKE DISPERSAL RATES. MIXING HEIGHTS TODAY ARE EXPECTED TO REACH
4000 T0 5000 FEET AND TRANSPORT WINDS SHOULD BE 8 TO 12 MPH. THIS
WILL RESULT IN SMOKE DISPERSAL JUST BARELY REACHING THE FAIR
CATEGORY DURING PEAK AFTERNOON HEATING.


.TODAY...

SKY/WEATHER.........SUNNY.
TEMPERATURE.........75 AT IGNITION...MAX 85.
RH..................37 PERCENT AT IGNITION...MIN 25 PERCENT.
WIND (20 FT)........WINDS SOUTH AT 8 MPH AT IGNITION...OTHERWISE
                    SOUTHEAST WINDS 7 TO 12 MPH.
CWR.................0 PERCENT.
LAL.................1.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......3900 TO 4900 FT AGL.
TRANSPORT WINDS.....SOUTHEAST 8 TO 12 MPH.
SMOKE DISPERSAL.....FAIR.

.TONIGHT...

SKY/WEATHER.........CLEAR.
TEMPERATURE.........MIN 54.
RH..................MAX 72 PERCENT.
WIND (20 FT)........SOUTH WINDS 10 TO 13 MPH.
CWR.................0 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 13 TO 21 MPH.
SMOKE DISPERSAL.....POOR.

.FRIDAY...

SKY/WEATHER.........SUNNY.
TEMPERATURE.........MAX 84.
RH..................MIN 28 PERCENT.
WIND (20 FT)........SOUTH WINDS 10 TO 17 MPH.
CWR.................0 PERCENT.
LAL.................1.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......4100 TO 5100 FT AGL.
TRANSPORT WINDS.....SOUTH 17 TO 21 MPH.
SMOKE DISPERSAL.....FAIR INCREASING TO GOOD IN THE AFTERNOON.

$$
FORECASTER...LC
REQUESTED BY...ERIC ALLEN
TYPE OF REQUEST...PRESCRIBED
.TAG 20090917.PICNI.01/UNR