FNUS75 KRIW 270916
FWSRIW

SPOT FORECAST FOR LOWER GROS VENTRE RX...IA TDC
NATIONAL WEATHER SERVICE RIVERTON WY
316 AM MDT MON SEP 27 2010

FORECAST IS BASED ON IGNITION TIME OF 1730 MDT ON SEPTEMBER 26.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
EXCEPT FOR VARIABLE HIGH CLOUDINESS TODAY...ANOTHER DRY AND VERY
WARM LATE SEPTEMBER DAY WILL OCCUR TODAY. WINDS WILL BE WEAKER
OVER THE FIRE SITE TODAY...AND WILL MAINLY BE LIGHT AND TERRAIN
DRIVEN.

AFTERNOON RH OBSERVED ON THE FIRE SITE HAS BEEN ABOUT 5 OR MORE PERCENT
HIGHER...THAN WHAT HAS BEEN RECORDED BY NEARBY RAWS STATIONS. THE
FORECAST RH IS WEIGHTED TOWARD THE LOWER RH.

THIS UNSEASONABLY VERY WARM AND DRY WEATHER PATTERN WILL CONTINUE
THROUGH AT LEAST OCTOBER 2ND.

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

FORECASTER...MURRELL

.TODAY...
SKY/WEATHER.........VARIABLE HIGH CLOUDS.
MAX TEMPERATURE.....75-80.
MIN HUMIDITY........12-16 PERCENT.
20 FOOT WINDS.......BECOMING UPSLOPE/UPVALLEY 4-8 MPH BY 1000.
RIDGE TOP WINDS.....LIGHT AND VARIABLE...BECOMING WEST 5-10 MPH
                    BETWEEN NOON AND 1400. GUSTS TO 15 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......800 FT AGL INCREASING TO 5000 FT AGL IN
                    THE AFTERNOON.
TRANSPORT WINDS.....WEST 5-10 MPH.
SMOKE DISPERSAL.....POOR...INCREASING TO FAIR.

.TONIGHT...
SKY/WEATHER.........CLEAR (5-15 PERCENT).
MIN TEMPERATURE.....45-50.
MAX HUMIDITY........50-55 PERCENT.
20 FOOT WINDS.......DOWNSLOPE/DOWNVALLEY 3-6 MPH AFTER SUNSET.
RIDGE TOP WINDS.....WEST TO SOUTHWEST 4-8 MPH...BECOMING LIGHT
                    AND VARIABLE BY MIDNIGHT.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......3400-4400 FT AGL DECREASING TO 1200-2200 FT AGL
                    AFTER MIDNIGHT.
TRANSPORT WINDS.....LIGHT WEST TO SOUTHWEST.
SMOKE DISPERSAL.....POOR.

.TUESDAY...
SKY/WEATHER.........SUNNY (5-15 PERCENT).
MAX TEMPERATURE.....AROUND 80.
MIN HUMIDITY........10-15 PERCENT.
20 FOOT WINDS.......BECOMING UPSLOPE/UPVALLEY 4-8 MPH BY 1000...BECOMING
                    SOUTHWEST 5-10 MPH BETWEEN NOON AND 1400. GUSTS
                    AROUND 15 MPH.
RIDGE TOP WINDS.....SOUTHEAST 5 TO 10 MPH SHIFTING TO THE WEST
                    SOUTHWEST BETWEEN NOON AND 1400.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......800 FT AGL INCREASING TO 6000 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....WEST SOUTHWEST AROUND 10 MPH.
SMOKE DISPERSAL.....POOR TO FAIR (10400-45400 KNOT-FT).

.FORECAST DAYS 3 THROUGH 5...
.TUESDAY NIGHT...CLEAR. LOWS IN THE LOWER 40S. WINDS GENERALLY
LESS THAN 10 MPH.

.WEDNESDAY...CLEAR. LOWS IN THE LOWER 40S. HIGHS IN THE UPPER
70S. WINDS GENERALLY LESS THAN 10 MPH.

.THURSDAY...MOSTLY CLEAR. LOWS IN THE LOWER 40S. HIGHS IN THE
UPPER 70S. WINDS GENERALLY LESS THAN 10 MPH.

.FRIDAY...MOSTLY CLEAR. LOWS IN THE LOWER 40S. HIGHS IN THE MID
70S. WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...MURRELL
REQUESTED BY...BRASS
REASON FOR REQUEST...PRESCRIBED
.TAG 20100926.LOWER.01/RIW