FNUS75 KRIW 181514
FWSRIW

SPOT FORECAST FOR PORCUPINE FIRE...USFS BTF
NATIONAL WEATHER SERVICE RIVERTON WY
914 AM MDT TUE AUG 18 2009

FORECAST IS BASED ON REQUEST TIME OF 0839 MDT ON AUGUST 18.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...

WEAK HIGH PRESSURE WILL REMAIN ACROSS THE REGION TODAY WITH BELOW
NORMAL TEMPERATURES AND DRY WEATHER EXPECTED. A COLD FRONT WILL MOVE
ACROSS THE AREA AFTER MIDNIGHT TONIGHT WITH A WIND SHIFT TO THE
NORTHWEST AND GUSTS UP TO 20 MPH. COOL NORTHWEST FLOW WILL PERSIST
ACROSS THE REGION WEDNESDAY WITH CONTINUED BELOW NORMAL TEMPERATURES
AND SLIGHTLY HIGHER AFTERNOON RELATIVE HUMIDITIES. AFTERNOON MIXING
WILL INCREASE NORTHWEST WIND GUSTS TO AROUND 25 MPH.

...THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS...
...HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT...

FORECASTER...SMITH

.TODAY...
SKY/WEATHER.........MOSTLY SUNNY (15-25 PERCENT) THEN BECOMING
                    PARTLY CLOUDY (25-35 PERCENT).
MAX TEMPERATURE.....62-65.
MIN HUMIDITY........20-23 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH.
RIDGE TOP WINDS.....EAST 10 TO 15 MPH SHIFTING TO THE WEST IN THE
                    AFTERNOON.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.

.TONIGHT...
SKY/WEATHER.........MOSTLY CLEAR (10-20 PERCENT).
MIN TEMPERATURE.....41-44.
MAX HUMIDITY........58-61 PERCENT.
20 FOOT WINDS.......DOWNSLOPE/DOWNVALLEY WINDS 5-9 MPH...THEN NORTHWEST WINDS
                    10 TO 15 MPH WITH GUSTS UP TO 20 MPH AFTER MIDNIGHT.
RIDGE TOP WINDS.....NORTHWEST 15 TO 20 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.

.WEDNESDAY...
SKY/WEATHER.........MOSTLY SUNNY (10-20 PERCENT).
MAX TEMPERATURE.....63-66.
MIN HUMIDITY........23-26 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH BECOMING NORTHWEST 11
                    TO 14 MPH WITH GUSTS TO AROUND 25 MPH IN THE
                    AFTERNOON.
RIDGE TOP WINDS.....NORTHWEST 20 TO 25 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.

.FORECAST DAYS 3 THROUGH 5...
.WEDNESDAY NIGHT...MOSTLY CLEAR. LOWS IN THE LOWER 40S. WINDS
GENERALLY LESS THAN 10 MPH.
.THURSDAY...MOSTLY CLEAR. LOWS IN THE MID 40S. HIGHS AROUND 70.
WINDS GENERALLY LESS THAN 10 MPH.
.FRIDAY...MOSTLY CLEAR. LOWS IN THE UPPER 40S. HIGHS IN THE MID
70S. WINDS GENERALLY LESS THAN 10 MPH.
.SATURDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS AROUND 50. HIGHS IN THE MID 70S. WINDS
GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...SMITH
REQUESTED BY...CODY MCFARLAND
REASON FOR REQUEST...WILDFIRE
.TAG 20090818.PORCU.01/RIW