FNUS75 KRIW 211057
FWSRIW

SPOT FORECAST FOR UPPER BILLIES RX...BLM RSD
NATIONAL WEATHER SERVICE RIVERTON WY
457 AM MDT MON MAY 21 2012

FORECAST IS BASED ON IGNITION TIME OF 2015 MDT ON MAY 20.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...A RIDGE OF HIGH PRESSURE WILL SHIFT EAST OF THE AREA
THIS AFTERNOON...FOLLOWED BY A MUCH DRIER AND WARMER SOUTHWEST
FLOW. A PACIFIC COLD FRONT WILL PUSH ACROSS THE WYOMING RANGE
EARLY TUESDAY MORNING...AROUND SUNRISE. THE FRONT IS EXPECTED TO
BE INITIALLY DRY WITH GUSTY WEST WINDS...COOLER TEMPERATURES AND
HIGHER RELATIVE HUMIDITY BEHIND THE FRONT TUESDAY. A BAND OF RAIN
AND SNOW SHOWERS WITH ISOLATED THUNDERSTORMS WILL PUSH ACROSS LATE
TUESDAY AFTERNOON/TUESDAY EVENING. AN OVERALL MUCH COOLER AND
WETTER PATTERN WILL PERSIST THROUGH THE REST OF THE WEEK.

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

FORECASTER...MEUNIER

.TODAY...
SKY/WEATHER.........MOSTLY SUNNY (15-25 PERCENT) THEN BECOMING
                    PARTLY CLOUDY (30-40 PERCENT) LATE AFTERNOON.
MAX TEMPERATURE.....67-70.
MIN HUMIDITY........17-20 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY OR EAST SOUTHEAST 5-9 MPH
                    BECOMING WEST SOUTHWEST 10 TO 15 MPH BETWEEN
                    1400 AND 1600 WITH GUSTS AROUND 25 MPH
                    IN THE LATE AFTERNOON.
RIDGE TOP WINDS.....SOUTHWEST AROUND 10 MPH THIS MORNING INCREASING TO
                    20 TO 25 MPH IN THE LATE AFTERNOON.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......5200-6200 FT AGL AFTER 0900 INCREASING TO 7500-8500 FT
                    AGL IN THE AFTERNOON.
TRANSPORT WINDS.....WEST 15 TO 20 MPH...BECOMING SOUTHWEST AROUND 25 MPH
                    IN THE LATE AFTERNOON.
SMOKE DISPERSAL.....GOOD (87000 KNOT-FT) BY LATE MORNING...INCREASING
                    TO EXCELLENT (176000 KNOT-FT) IN THE AFTERNOON.

.TONIGHT...
SKY/WEATHER.........PARTLY CLOUDY (40-50 PERCENT).
MIN TEMPERATURE.....45-48.
MAX HUMIDITY........44-47 PERCENT.
20 FOOT WINDS.......SOUTHWEST WINDS AROUND 15 MPH WITH GUSTS TO
                    AROUND 30 MPH...BECOMING WEST 0300-0600.
RIDGE TOP WINDS.....SOUTHWEST 20 TO 25 MPH...BECOMING WEST AROUND
                    30 MPH 0300-0600.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......7000-8000 FT AGL DECREASING TO 1500-2500 FT AGL
                    AFTER MIDNIGHT.
TRANSPORT WINDS.....SOUTHWEST 25 TO 30 MPH.
SMOKE DISPERSAL.....EXCELLENT (161700 KNOT-FT) DECREASING TO FAIR
                    (45800 KNOT-FT) AFTER MIDNIGHT.

.TUESDAY...
SKY/WEATHER.........PARTLY CLOUDY IN THE MORNING (40-50 PERCENT) WITH ISOLATED
                    RAIN SHOWERS.  MOSTLY CLOUDY IN THE AFTERNOON WITH
                    SHOWERS BECOMING MORE NUMEROUS LATE AFTERNOON.  AN ISOLATED
                    THUNDERSTORM POSSIBLE.
MAX TEMPERATURE.....56-59.
MIN HUMIDITY........32-35 PERCENT.
20 FOOT WINDS.......WEST WINDS 16 TO 19 MPH WITH GUSTS TO AROUND 35
                    MPH. GUSTY AND ERRATIC WINDS EXPECTED NEAR
                    THUNDERSTORMS.
RIDGE TOP WINDS.....WEST 25 TO 30 MPH.
LAL.................2.
CHC OF WETTING RAIN.20 PERCENT.
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......2700-3700 FT AGL INCREASING TO 5300-6100 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....WEST 25 TO 30 MPH.
SMOKE DISPERSAL.....GOOD (78100 KNOT-FT) INCREASING TO VERY GOOD
                    (143700 KNOT-FT) IN THE AFTERNOON.

.FORECAST DAYS 3 THROUGH 5...
.TUESDAY NIGHT...COLDER. MOSTLY CLOUDY. SCATTERED SHOWERS AND
ISOLATED THUNDERSTORMS IN THE EVENING...THEN SCATTERED SNOW
SHOWERS AFTER MIDNIGHT. LOWS IN THE UPPER 20S. WEST WINDS AROUND
20 MPH.

.WEDNESDAY...COLDER. PARTLY CLOUDY WITH CHANCE OF SHOWERS...SNOW
SHOWERS AND ISOLATED THUNDERSTORMS. LOWS IN THE MID 20S. HIGHS IN
THE LOWER 40S. WEST WINDS AROUND 15 MPH.

.THURSDAY...PARTLY CLOUDY. CHANCE OF SHOWERS...SNOW SHOWERS AND
ISOLATED THUNDERSTORMS. LOWS IN THE UPPER 20S. HIGHS IN THE UPPER
30S. WINDS GENERALLY LESS THAN 10 MPH.

.FRIDAY...WARMER. MOSTLY CLOUDY WITH CHANCE OF SHOWERS...SNOW
SHOWERS AND ISOLATED THUNDERSTORMS. LOWS IN THE LOWER 30S. HIGHS
AROUND 50. WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...MEUNIER
REQUESTED BY...GREG RESER
REASON FOR REQUEST...PRESCRIBED
.TAG 20120520.UPPER.01/RIW