FNUS75 KRIW 131630
FWSRIW

SPOT FORECAST FOR UPPER WIND FT6...USFS SHF
NATIONAL WEATHER SERVICE RIVERTON WY
1030 AM MDT MON MAY 13 2013

FORECAST IS BASED ON IGNITION TIME OF 1025 MDT ON MAY 13.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...A HIGH PRESSURE RIDGE WILL BUILD OVER THE AREA WITH
INCREASING WEST SOUTHWEST FLOW ALOFT.  A LEE SIDE TROUGH WILL DEEPEN
OVER EASTERN WYOMING WITH SURFACE HIGH PRESSURE OVER THE NORTHERN
GREAT BASIN.  THIS WILL INCREASE THE PRESSURE GRADIENT OVER THE BURN
AREA TODAY AND EVEN MORE ON TUESDAY WITH INCREASING SURFACE WINDS AND
LOW SURFACE RELATIVE HUMIDITY.

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

FORECASTER...C.BAKER

.TODAY...
SKY/WEATHER.........PARTLY CLOUDY (35-45 PERCENT).
MAX TEMPERATURE.....69-72.
MIN HUMIDITY........18-21 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH BECOMING SOUTHWEST 12
                    TO 16 MPH WITH GUSTS TO AROUND 25 MPH IN THE
                    AFTERNOON.
RIDGE TOP WINDS.....SOUTHWEST 17 TO 22 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......2800-3800 FT AGL INCREASING TO 5500-6500 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST 22 TO 30 MPH.
SMOKE DISPERSAL.....GOOD (66200 KNOT-FT) INCREASING TO VERY GOOD
                    (144400 KNOT-FT) IN THE AFTERNOON.

.TONIGHT...
SKY/WEATHER.........PARTLY CLOUDY (35-45 PERCENT).
MIN TEMPERATURE.....AROUND 45.
MAX HUMIDITY........55-60 PERCENT.
20 FOOT WINDS.......WEST WINDS 12 TO 17 MPH WITH GUSTS TO AROUND 30
                    MPH.
RIDGE TOP WINDS.....WEST 17 TO 24 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......4600-5600 FT AGL DECREASING TO 2000-3000 FT AGL
                    AFTER MIDNIGHT.
TRANSPORT WINDS.....WEST 30 TO 35 MPH.
SMOKE DISPERSAL.....VERY GOOD (136500 KNOT-FT) DECREASING TO GOOD
                    (70100 KNOT-FT) AFTER MIDNIGHT.

.TUESDAY...
SKY/WEATHER.........PARTLY CLOUDY (30-40 PERCENT).
MAX TEMPERATURE.....62-64.
MIN HUMIDITY........16-20 PERCENT.
20 FOOT WINDS.......BREEZY. WEST WINDS 15 TO 20 MPH WITH GUSTS TO
                    AROUND 30 MPH.
RIDGE TOP WINDS.....WEST 20 TO 25 MPH INCREASING TO AROUND 28 MPH
                    LATE IN THE AFTERNOON.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......2800-3800 FT AGL INCREASING TO 5400-6400 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....WEST 35 TO 44 MPH.
SMOKE DISPERSAL.....VERY GOOD (101900 KNOT-FT) INCREASING TO
                    EXCELLENT (177400 KNOT-FT) IN THE AFTERNOON.

.FORECAST DAYS 3 THROUGH 5...
.TUESDAY NIGHT...PARTLY CLOUDY. LOWS IN THE MID 30S. WEST WINDS
AROUND 12 MPH.
.WEDNESDAY...PARTLY CLOUDY. LOWS IN THE MID 30S. HIGHS IN THE
LOWER 60S. WEST WINDS AROUND 11 MPH.
.THURSDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS IN THE MID 30S. HIGHS AROUND 60. WINDS
GENERALLY LESS THAN 10 MPH.
.FRIDAY...MOSTLY CLOUDY WITH CHANCE OF SHOWERS...THUNDERSTORMS
AND SLIGHT CHANCE OF SNOW SHOWERS. LOWS IN THE LOWER 30S. HIGHS
IN THE UPPER 50S. WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...C.BAKER
REQUESTED BY...NICK PIEPER
REASON FOR REQUEST...PRESCRIBED
.TAG 20130513.UPPER.01/RIW