FNUS75 KRIW 231433
FWSRIW

SPOT FORECAST FOR LOWER GROS VENTRE...USFS BTF
NATIONAL WEATHER SERVICE RIVERTON WY
833 AM MDT WED SEP 23 2009

FORECAST IS BASED ON IGNITION TIME OF 0840 MDT ON SEPTEMBER 23.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
HIGH PRESSURE OVER THE AREA WILL KEEP WARMING TEMPERATURES AND
LOWERED HUMIDITY OVER THE FIRE THIS AFTERNOON. SLIGHTLY COOLER
TEMPERATURES MAY BE NOTED OVER TH AREA THURSDAY AS AN AREA OF LOW
PRESSURE OVER NEBRASKA MOVES SLIGHTLY NORTHEAST. HOWEVER...THE
PREVIOUSLY MENTIONED AREA OF HIGH PRESSURE WILL REMAIN OVER THE
AREA THROUGH FRIDAY AFTERNOON. A WEAK DISTURBANCE WILL MOVE OVER
THE FIRE FRIDAY NIGHT AND INTO SATURDAY MORNING. THIS DISTURBANCE
IS NOT EXPECTED TO BRING SIGNIFICANT PRECIPITATION OVER THE
AREA...AND WILL PRIMARILY BE A WEAK WIND SHIFT.


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

FORECASTER...BRANHAM

.TODAY...
SKY/WEATHER.........SUNNY (0-10 PERCENT).
MAX TEMPERATURE.....61-64 BELOW 8500 FT...58-61 ABOVE 8500 FT.
MIN HUMIDITY........24-27 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH. GUSTS UP TO 15 MPH
                    AFTER 1500.
RIDGE TOP WINDS.....NORTHEAST 10 TO 15 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......1800 FT AGL INCREASING TO 7100 FT AGL BY 1400.
TRANSPORT WINDS.....NORTHEAST 10 TO 16 MPH.
SMOKE DISPERSAL.....POOR (19800 KNOT-FT) INCREASING TO GOOD (71900
                    KNOT-FT) BY 1400.

.TONIGHT...
SKY/WEATHER.........MOSTLY CLEAR (5-15 PERCENT).
MIN TEMPERATURE.....37-40 BELOW 8500 FT...34-37 ABOVE 8500 FT.
MAX HUMIDITY........60-65 PERCENT.
20 FOOT WINDS.......NORTH WINDS 7-10 MPH WITH GUSTS TO AROUND
                    15 MPH THROUGH 2000...THEN BECOMING
                    DOWNSLOPE/DOWNVALLEY 4-7 MPH.
RIDGE TOP WINDS.....NORTHEAST 10 TO 15 MPH SHIFTING TO THE NORTH
                    AROUND 5 MPH BY 0200.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......DECREASING TO 300 FT AGL BY 0200.
TRANSPORT WINDS.....NORTH 12 TO 17 MPH...DECREASING TO 7 TO
                    10 MPH BY 0300.
SMOKE DISPERSAL.....BECOMING POOR (2700-38500 KNOT-FT).

.THURSDAY...
SKY/WEATHER.........MOSTLY SUNNY (10-20 PERCENT).
MAX TEMPERATURE.....60-63 BELOW 8500...58-60 ABOVE 8500 FT.
MIN HUMIDITY........18-21 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH.
RIDGE TOP WINDS.....NORTH TO NORTHEAST AROUND 5 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......INCREASING TO 6700 FT AGL BY 1400.
TRANSPORT WINDS.....NORTH AT 6-10 MPH.
SMOKE DISPERSAL.....POOR TO FAIR (5100-53400 KNOT-FT).

.FORECAST DAYS 3 THROUGH 5...
.THURSDAY NIGHT...MOSTLY CLEAR. LOWS IN THE LOWER 40S. WINDS
GENERALLY LESS THAN 10 MPH.
.FRIDAY...MOSTLY CLEAR. LOWS AROUND 40. HIGHS IN THE LOWER 60S.
WINDS GENERALLY LESS THAN 10 MPH.
.SATURDAY...MOSTLY CLEAR. LOWS IN THE UPPER 30S. HIGHS IN THE
LOWER 60S. WINDS GENERALLY LESS THAN 10 MPH.
.SUNDAY...MOSTLY CLEAR. LOWS IN THE UPPER 30S. HIGHS IN THE MID
60S. WEST WINDS AROUND 10 MPH.

$$

FORECASTER...BRANHAM
REQUESTED BY...MCFARLAND
REASON FOR REQUEST...PRESCRIBED
.TAG 20090923.LOWER.01/RIW