FNUS75 KRIW 250045
FWSRIW

SPOT FORECAST FOR BEACH FIRE...NPS YNP
NATIONAL WEATHER SERVICE RIVERTON WY
645 PM MDT SAT JUL 24 2010

FORECAST IS BASED ON REQUEST TIME OF 1803 MDT ON JULY 24.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...A VERY DRY AIRMASS WILL REMAIN OVER THE AREA THROUGH
SUNDAY EVENING.  TEMPERATURES WILL TREND SLIGHTLY HIGHER WITH
SLIGHTLY LOWER RELATIVE HUMIDITY ON SUNDAY.  THE OVERALL DIURNAL
TRENDS IN WIND DIRECTION AND SPEED ON SUNDAY WILL BE SIMILAR TO
TODAY. DEEP MONSOONAL MOISTURE WILL SURGE NORTHWARD INTO THE AREA
MONDAY NIGHT THROUGH WEDNESDAY ALONG WITH INCREASING CHANCES OF
THUNDERSTORMS AND WETTING RAINS.

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

FORECASTER...MEUNIER

.TONIGHT...
SKY/WEATHER.........CLEAR (0-10 PERCENT).
MIN TEMPERATURE.....39-42.
MAX HUMIDITY........80-83 PERCENT.
WIND (20 FT)........WEST NORTHWEST 4 TO 7 MPH THROUGH SUNSET...BECOMING
                    NORTH 3 TO 5 MPH AFTER MIDNIGHT.
RIDGE TOP WINDS.....SOUTHWEST 5 TO 10 MPH.
LAL.................1.
CWR.................ZERO PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......DECREASING TO NEAR 2500 AGL AT DUSK AND TO NEAR 1000 FT AGL
                    BY 0400.
TRANSPORT WINDS.....WEST SOUTHWEST NEAR 10 MPH THROUGH SUNSET THEN SOUTHWEST
                    AROUND 5 MPH.
SMOKE DISPERSAL.....BECOMING POOR (25000 KNOT-FT) AT DUSK.

.SUNDAY...
SKY/WEATHER.........MOSTLY SUNNY (5-15 PERCENT).
MAX TEMPERATURE.....76-79.
MIN HUMIDITY........23-26 PERCENT.
WIND (20 FT)........BECOMING SOUTHEAST 4-7 MPH AROUND 0900 AND THEN
                    WEST SOUTHWEST 5 TO 10 MPH WITH GUSTS TO 15 MPH
                    BETWEEN 1400 AND 1600.
RIDGE TOP WINDS.....SOUTHWEST 5 TO 10 MPH IN THE MORNING...BECOMING WEST
                    10 TO 15 MPH IN THE AFTERNOON.
LAL.................1.
CWR.................ZERO PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......4700-5700 FT AGL INCREASING TO 10300-11300 FT
                    AGL IN THE AFTERNOON.
TRANSPORT WINDS.....WEST SOUTHWEST 16 TO 22 MPH.
SMOKE DISPERSAL.....GOOD (73100 KNOT-FT) INCREASING TO EXCELLENT
                    (181400 KNOT-FT) IN THE AFTERNOON.

.FORECAST DAYS 3 THROUGH 5...
.SUNDAY NIGHT...MOSTLY CLEAR. LOWS IN THE LOWER 40S. WINDS
GENERALLY LESS THAN 10 MPH.
.MONDAY...PARTLY CLOUDY WITH ISOLATED SHOWERS AND THUNDERSTORMS.
LOWS IN THE MID 40S. HIGHS IN THE MID 70S. WINDS GENERALLY LESS
THAN 10 MPH.
.TUESDAY...PARTLY CLOUDY WITH ISOLATED SHOWERS AND THUNDERSTORMS.
LOWS IN THE LOWER 40S. HIGHS IN THE UPPER 60S. WINDS GENERALLY
LESS THAN 10 MPH.
.WEDNESDAY...PARTLY CLOUDY WITH SCATTERED SHOWERS AND
THUNDERSTORMS. LOWS AROUND 40. HIGHS IN THE MID 60S. WINDS
GENERALLY LESS THAN 10 MPH.
.THURSDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS AROUND 40. HIGHS IN THE UPPER 60S. WINDS
GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...MEUNIER
REQUESTED BY...EDWIN FOLTS
REASON FOR REQUEST...WILDFIRE
.TAG 20100724.BEACH.01/RIW