FNUS75 KRIW 260942
FWSRIW

SPOT FORECAST FOR LOWER GROS VENTRE RX...IA TDC
NATIONAL WEATHER SERVICE RIVERTON WY
342 AM MDT SUN SEP 26 2010

FORECAST IS BASED ON IGNITION TIME OF 1810 MDT ON SEPTEMBER 25.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...

UNSEASONABLY WARM AND DRY CONDITIONS WILL PERSIST THROUGH AT LEAST
THE END OF THE MONTH. WINDS TODAY ARE EXPECTED TO BE LIGHT AND TERRAIN
DRIVEN THROUGH MIDDAY...BEFORE BECOMING SOUTHWEST DURING THE AFTERNOON.
THE WINDS WILL BE SLIGHTLY STRONGER THAN WHAT OCCURRED YESTERDAY AND
RELATIVE HUMIDITY WILL BE LOWER...WITH MINIMUM RH EXPECTED TO BE IN
THE 10 TO 15 PERCENT RANGE. SLIGHTLY HIGHER RH AND WEAKER WINDS ARE
EXPECTED ON MONDAY.

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

FORECASTER...MURRELL

.TODAY...
SKY/WEATHER.........MOSTLY SUNNY (5-15 PERCENT).
MAX TEMPERATURE.....75-80.
MIN HUMIDITY........10-15 PERCENT.
20 FOOT WINDS.......BECOMING UPSLOPE/UPVALLEY 3-6 MPH AROUND 1000
                    SWITCHING TO SOUTHWEST AROUND 10 MPH BETWEEN
                    NOON AND 1400. GUST AROUND 18 MPH.
RIDGE TOP WINDS.....SOUTH TO SOUTHEAST 5-10 MPH...BECOMING SOUTHWEST
                    TO WEST 10-15 MPH...BETWEEN NOON AND 1400. GUSTS
                    TO 25 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......1600 FT AGL INCREASING TO 6800 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTH AROUND 10 MPH SHIFTING TO THE WEST
                    SOUTHWEST AROUND 15 MPH IN THE AFTERNOON.
SMOKE DISPERSAL.....POOR (17900 KNOT-FT) INCREASING TO GOOD (88000
                    KNOT-FT) IN THE AFTERNOON.

.TONIGHT...
SKY/WEATHER.........MOSTLY CLEAR (25-35 PERCENT).
MIN TEMPERATURE.....44-48.
MAX HUMIDITY........35-40 PERCENT.
20 FOOT WINDS.......SOUTHWEST 5-10 MPH BECOMING DOWNSLOPE/DOWNVALLEY
                    3-6 MPH BY 2000.
RIDGE TOP WINDS.....SOUTHWEST 5-10 MPH...BECOMING SOUTH TO SOUTHEAST
                    BY MIDNIGHT.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......5200-6200 FT AGL DECREASING TO 1000-2000 FT AGL
                    AFTER MIDNIGHT.
TRANSPORT WINDS.....SOUTHWEST 5-10 MPH AT RIDGE TOP...LIGHT AND
                    VARIABLE BY 2000...GENERALLY BELOW 8000 FT.
SMOKE DISPERSAL.....GOOD (71200 KNOT-FT) DECREASING TO POOR (11200
                    KNOT-FT) BY 2000.

.MONDAY...
SKY/WEATHER.........MOSTLY SUNNY (5-15 PERCENT).
MAX TEMPERATURE.....70-75.
MIN HUMIDITY........14-18 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 4-8 MPH.
RIDGE TOP WINDS.....SOUTHWEST 5-10 MPH SHIFTING TO THE WEST NORTHWEST
                    IN THE AFTERNOON.
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 5600 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....WEST SOUTHWEST AROUND 10 MPH SHIFTING TO THE
                    WEST NORTHWEST IN THE AFTERNOON.
SMOKE DISPERSAL.....POOR INCREASING TO FAIR.

.FORECAST DAYS 3 THROUGH 5...
.MONDAY NIGHT...MOSTLY CLEAR. LOWS AROUND 40. WINDS GENERALLY
LESS THAN 10 MPH.

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

.WEDNESDAY...CLEAR. LOWS IN THE LOWER 40S. HIGHS IN THE MID 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.

$$

FORECASTER...MURRELL
REQUESTED BY...YETTER
REASON FOR REQUEST...PRESCRIBED
.TAG 20100925.LOWER.01/RIW