FNUS75 KRIW 270226
FWSRIW

SPOT FORECAST FOR HEADWATERS FIRE...NPS YNP
NATIONAL WEATHER SERVICE RIVERTON WY
826 PM MDT MON SEP 26 2011

FORECAST IS BASED ON REQUEST TIME OF 1958 MDT ON SEPTEMBER 26.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...

A RIDGE OF HIGH PRESSURE WILL ONCE AGAIN BUILD INTO THE AREA
TONIGHT AND TUESDAY. THIS WILL RESULT IN DRY AND UNSEASONABLY
WARM TEMPERATURES. WINDS ON TUESDAY WILL BE UPSLOPE/UPVALLEY OR
SOUTH TO SOUTHWEST ACROSS THE WILDFIRE AREA. A DRY COLD FRONT IS
EXPECTED TO MOVE ACROSS WESTERN WYOMING WEDNESDAY...WITH SLIGHTLY
STRONGER WESTERLY WINDS WEDNESDAY THAN WHAT IS EXPECTED ON TUESDAY.
HOWEVER...MOST OF THE IMPACT FROM THIS COLD FRONT WILL BE EAST OF
THE DIVIDE.

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

FORECASTER...MURRELL

.TONIGHT...
SKY/WEATHER.........CLEAR (0-10 PERCENT).
MIN TEMPERATURE.....35-40.
MAX HUMIDITY........70-75 PERCENT.
20 FOOT WINDS.......SOUTH TO SOUTHWEST WINDS 4-8 MPH...BECOMING
                    DOWNSLOPE/DOWNVALLEY 3-6 MPH AROUND MIDNIGHT.
RIDGE TOP WINDS.....SOUTHWEST AROUND 10 MPH...BECOMING SOUTH AROUND
                    5 MPH BETWEEN MIDNIGHT AND 0200.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......1000 FT AGL.
TRANSPORT WINDS.....SOUTHWEST AROUND 10 MPH...BECOMING SOUTH AROUND
                    5 MPH BETWEEN MIDNIGHT AND 0200.
SMOKE DISPERSAL.....POOR (19500 KNOT-FT).

.TUESDAY...
SKY/WEATHER.........SUNNY (5-15 PERCENT).
MAX TEMPERATURE.....60-65.
MIN HUMIDITY........18-22 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 4-8 MPH...BECOMING
                    SOUTHWEST 8 TO 12 MPH AROUND NOON. GUSTS TO
                    AROUND 25 MPH IN THE AFTERNOON.
RIDGE TOP WINDS.....SOUTHWEST AROUND 15 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......INCREASING TO 4500 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 15 TO 20 MPH.
SMOKE DISPERSAL.....POOR INCREASING TO GOOD BY AROUND NOON.

.FORECAST DAYS 3 THROUGH 5...
.TUESDAY NIGHT...CLEAR. LOWS IN THE MID 30S. SOUTHWEST WINDS
AROUND 12 MPH.

.WEDNESDAY...MOSTLY CLEAR. LOWS IN THE LOWER 30S. HIGHS IN THE
LOWER 60S. SOUTHWEST WINDS 10 TO 15 MPH.

.THURSDAY...CLEAR. LOWS IN THE LOWER 30S. HIGHS IN THE MID 60S.
WINDS GENERALLY LESS THAN 10 MPH.

.FRIDAY...MOSTLY CLEAR. LOWS IN THE MID 30S. HIGHS IN THE UPPER
60S. WINDS GENERALLY LESS THAN 10 MPH.

.SATURDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS...SNOW
SHOWERS AND ISOLATED THUNDERSTORMS. LOWS IN THE LOWER 30S. HIGHS
IN THE MID 60S. WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...MURRELL
REQUESTED BY...M  HEANEY
REASON FOR REQUEST...WILDFIRE
.TAG 20110926.HEADW.01/RIW