FNUS73 KUNR 211540
FWSUNR

SPOT FORECAST FOR MAHONEY...US FOREST SERVICE
NATIONAL WEATHER SERVICE RAPID CITY SD
940 AM MDT THU OCT 21 2010

FORECAST IS BASED ON IGNITION TIME OF 0930 MDT ON OCTOBER 22.
IF CONDITIONS BECOME UNREPRESENTATIVE CONTACT THE
NATIONAL WEATHER SERVICE OFFICE IN RAPID CITY.

.DISCUSSION...AN UPPER LEVEL RIDGE OF HIGH PRESSURE WILL BRING SUNNY
SKIES AND WARM TEMPERATURES TO THE AREA TODAY. AN UPPER LEVEL LOW WILL
APPROACH THE AREA LATE FRIDAY. SMOKE DISPERSAL IS IN THE LOW END OF THE
FAIR CATEGORY TODAY...HOWEVER SLIGHTLY COOLER SURFACE TEMPERATURES ON
FRIDAY WILL RESULT IN LOWER MIXING HEIGHTS AND POOR SMOKE DISPERSAL.

.TODAY...

SKY/WEATHER.........SUNNY.
TEMPERATURE.........MAX 67-69.
RH..................AROUND 22 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 4 TO 8 MPH.
CWR.................0 PERCENT.
LAL.................1.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......3500 TO 4200 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 6 TO 10.
SMOKE DISPERSAL.....FAIR.

.TONIGHT...

SKY/WEATHER.........MOSTLY CLEAR.
TEMPERATURE.........MIN 42-45.
RH..................MAX AROUND 65 PERCENT.
WIND (20 FT)........VARIABLE 2 TO 5 MPH.
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.....NORTH 6 TO 8 MPH.
SMOKE DISPERSAL.....POOR.

.FRIDAY...

SKY/WEATHER.........MOSTLY SUNNY.
TEMPERATURE.........56 AT IGNITION...MAX 65-67.
RH..................48 PERCENT AT IGNITION...MIN 28 PERCENT.
WIND (20 FT)........WINDS EAST AT 9 MPH AT IGNITION...OTHERWISE
                    EAST WINDS 5 TO 12 MPH.
CWR.................0 PERCENT.
LAL.................1.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......3300 TO 3900 FT AGL.
TRANSPORT WINDS.....5 TO 10 MPH.
SMOKE DISPERSAL.....POOR.

$$
FORECASTER...NWS
REQUESTED BY...JAY MILLER
TYPE OF REQUEST...PRESCRIBED
.TAG 20101022.MAHON.01/UNR