FNUS75 KRIW 281950
FWSRIW

SPOT FORECAST FOR HEADWATERS...NPS YNP
NATIONAL WEATHER SERVICE RIVERTON WY
150 PM MDT WED SEP 28 2011

FORECAST IS BASED ON REQUEST TIME OF 1257 MDT ON SEPTEMBER 28.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...A WEAK...DRY COLD FRONT WILL MOVE ACROSS NORTHWEST WYOMING THIS
MORNING. MINIMUM RH AND TEMPERATURES IN THE WAKE OF THIS FRONT WILL
BE SIMILAR TO WHAT OCCURRED YESTERDAY...WITH MODERATE SOUTHWESTERLY
WINDS...BUT NOTHING EXTREME. WARM AND VERY DRY CONDITIONS ARE THEN
EXPECTED THURSDAY AND FRIDAY...WITH MAINLY LIGHT AND TERRAIN DRIVEN
WINDS.

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

FORECASTER...LIPSON

.REST OF TODAY...
SKY/WEATHER.........MOSTLY SUNNY (15-25 PERCENT).
MAX TEMPERATURE.....68 AT 8000 FEET AND 64 AT 9000 FEET.
MIN HUMIDITY........26-27 PERCENT.
20 FOOT WINDS.......SOUTHWEST WINDS AROUND 3 TO 5 MPH WITH GUSTS TO 10 MPH.
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.......4500-5500 FT AGL.
TRANSPORT WINDS.....SOUTHWEST AROUND 20 MPH.
SMOKE DISPERSAL.....GOOD (83800 KNOT-FT).

.TONIGHT...
SKY/WEATHER.........MOSTLY CLEAR (25-35 PERCENT).
MIN TEMPERATURE.....31-34.
MAX HUMIDITY........77-80 PERCENT.
20 FOOT WINDS.......WEST SOUTHWEST WINDS 5 TO 9 MPH WITH GUSTS TO
                    AROUND 12 MPH THROUGH 2000,. THEN DOWNSLOPE/DOWNVALLEY
                    4-7 MPH.
RIDGE TOP WINDS.....SOUTHWEST 10 TO 15 MPH SHIFTING TO THE NORTH
                    AFTER MIDNIGHT...THEN SHIFTING TO THE SOUTHEAST
                    EARLY IN THE MORNING.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......3500-4500 FT AGL DECREASING TO 700-1500 FT AGL
                    AFTER MIDNIGHT.
TRANSPORT WINDS.....SOUTHWEST 13 TO 17 MPH SHIFTING TO THE NORTH
                    AROUND 10 MPH AFTER MIDNIGHT...THEN SHIFTING TO
                    THE SOUTHEAST AROUND 12 MPH EARLY IN THE
                    MORNING.
SMOKE DISPERSAL.....POOR TO FAIR (7000-55400 KNOT-FT).

.THURSDAY...
SKY/WEATHER.........MOSTLY SUNNY (10-20 PERCENT).
MAX TEMPERATURE.....65 AT 8000 FEET AND 59 AT 9000 FEET.
MIN HUMIDITY........26 PERCENT AT 8000 FEET AND 32 PERCENT AT 9000 FEET.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 3-7 MPH BECOMING SOUTHWEST
                    AROUND 9 MPH WITH HIGHER GUSTS TO 13 MPH BY 1200.                   AFTERNOON.
RIDGE TOP WINDS.....SOUTHWEST 10 TO 15 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......1300-2300 FT AGL INCREASING TO 3900-4900 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTH 10 TO 17 MPH SHIFTING TO THE SOUTHWEST
                    AROUND 20 MPH LATE IN THE AFTERNOON.
SMOKE DISPERSAL.....POOR TO GOOD (20800-67300 KNOT-FT).

.FORECAST DAYS 3 THROUGH 5...
.THURSDAY NIGHT...MOSTLY CLEAR. LOWS IN THE MID 30S. SOUTHWEST
WINDS AROUND 10 MPH.
.FRIDAY...MOSTLY CLEAR. LOWS IN THE MID 30S. HIGHS IN THE UPPER
60S. SOUTHWEST WINDS AROUND 10 MPH.
.SATURDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND SNOW
SHOWERS. LOWS IN THE MID 30S. HIGHS IN THE MID 60S. WINDS
GENERALLY LESS THAN 10 MPH.
.SUNDAY...PARTLY CLOUDY WITH CHANCE OF SHOWERS WITH POSSIBLE SNOW
SHOWERS AND THUNDERSTORMS. LOWS IN THE LOWER 30S. HIGHS IN THE
UPPER 50S. WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...LIPSON
REQUESTED BY...LAURA DOOLEY
REASON FOR REQUEST...WILDFIRE
.TAG 20110928.HEADW.01/RIW