FNUS75 KRIW 292140
FWSRIW

SPOT FORECAST FOR HEADWATERS...NPS YNP
NATIONAL WEATHER SERVICE RIVERTON WY
340 PM MDT THU SEP 29 2011

FORECAST IS BASED ON REQUEST TIME OF 1445 MDT ON SEPTEMBER 29.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...WARM AND DRY CONDITIONS WILL OCCUR THE NEXT COUPLE OF DAYS UNDER A
RIDGE OF HIGH PRESSURE. LITTLE DAY TO DAY VARIABILITY IN THE WEATHER
PARAMETERS WILL OCCUR THIS EVENING AND FRIDAY. A WEAK SYSTEM WILL BRUSH THE
AREA THIS WEEKEND...WITH A SLIGHT CHANCE FOR RAIN SHOWERS...MAINLY
ON SUNDAY. A MUCH STRONGER STORM SYSTEM IS EXPECTED MID TO LATE NEXT
WEEK.

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

FORECASTER...LIPSON

.TONIGHT...
SKY/WEATHER.........CLEAR (0-10 PERCENT).
MIN TEMPERATURE.....31-34.
MAX HUMIDITY........70-73 PERCENT.
20 FOOT WINDS.......SOUTH TO SOUTHWEST WINDS 2 TO 5 MPH. BY 2300 SOUTH
                    1 TO 3 MPH.
RIDGE TOP WINDS.....SOUTHWEST AROUND 15 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 DECREASING TO 700 FT AGL AFTER
                    MIDNIGHT.
TRANSPORT WINDS.....SOUTHWEST 16 TO 18 MPH.
SMOKE DISPERSAL.....POOR TO FAIR (9900-50800 KNOT-FT).

.FRIDAY...
SKY/WEATHER.........SUNNY (5-15 PERCENT).
MAX TEMPERATURE.....67 AT 8000 FEET AND 62 AT 9000 FEET.
MIN HUMIDITY........24 PERCENT AT 8000 FEET AND 29 PERCENT 9000 FEET.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 1-3 MPH BECOMING SOUTH AT 3 TO 6 MPH
                    BY 1000 AND THEN SOUTHWEST AT 4 TO 8 MPH BY 1200.
RIDGE TOP WINDS.....SOUTHWEST 15 TO 20 MPH.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......2300-3300 FT AGL INCREASING TO 6600-7600 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST 16 TO 21 MPH.
SMOKE DISPERSAL.....FAIR (41400 KNOT-FT) INCREASING TO VERY GOOD
                    (115600 KNOT-FT) IN THE AFTERNOON.

.FORECAST DAYS 3 THROUGH 5...
.FRIDAY NIGHT...PARTLY CLOUDY. LOWS IN THE MID 30S. SOUTHWEST
WINDS AROUND 10 MPH.
.SATURDAY...PARTLY CLOUDY WITH OCCASIONAL SPRINKLES AND SLIGHT
CHANCE OF THUNDERSTORMS. LOWS IN THE MID 30S. HIGHS IN THE UPPER
60S. SOUTH WINDS AROUND 12 MPH.
.SUNDAY...PARTLY CLOUDY WITH CHANCE OF SHOWERS AND ISOLATED
THUNDERSTORMS. LOWS IN THE LOWER 30S. HIGHS AROUND 60. WINDS
GENERALLY LESS THAN 10 MPH.
.MONDAY...PARTLY CLOUDY WITH CHANCE OF SHOWERS...THUNDERSTORMS
AND SNOW SHOWERS. LOWS IN THE LOWER 30S. HIGHS AROUND 60. WINDS
GENERALLY LESS THAN 10 MPH.
.TUESDAY...PARTLY CLOUDY WITH CHANCE OF SHOWERS...SNOW SHOWERS
AND ISOLATED THUNDERSTORMS. LOWS IN THE UPPER 20S. HIGHS IN THE
LOWER 50S. SOUTHWEST WINDS AROUND 11 MPH.

$$

FORECASTER...LIPSON
REQUESTED BY...LAURA DOOLEY
REASON FOR REQUEST...WILDFIRE
.TAG 20110929.HEADW.01/RIW