FNUS75 KRIW 241023
FWSRIW

SPOT FORECAST FOR ANTELOPE...NPS YNP
NATIONAL WEATHER SERVICE RIVERTON WY
423 AM MDT FRI SEP 24 2010

FORECAST IS BASED ON REQUEST TIME OF 2018 MDT ON SEPTEMBER 23.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...AN UPPER LEVEL DISTURBANCE AND ASSOCIATED COLD FRONT
WILL MOVE ACROSS MONTANA INTO NORTH CENTRAL WYOMING TODAY.
A DRY WESTERLY FLOW WILL DEVELOP SOUTH OF THE FRONT ACROSS THE
BURN AREA TODAY...TEMPERATURES TRENDING SLIGHTLY WARMER...RELATIVE
HUMIDITY LOWER AND WIND SPEEDS HIGHER THAN ON THURSDAY. WINDS WILL
DIMINISH WITH SUNSET WITH BETTER RELATIVE HUMIDITY RECOVERY
TONIGHT. AN UPPER RIDGE WILL BUILD IN OVER THE WEEKEND WITH
TEMPERATURES TRENDING WARMER. WINDS WILL BE LIGHTER ON SATURDAY. A
MUCH DRIER AIRMASS WILL PUSH IN ON SUNDAY AHEAD OF THE NEXT
APPROACHING COLD FRONT DUE THROUGH SUNDAY NIGHT.


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

FORECASTER...MEUNIER

.TODAY...
SKY/WEATHER.........PARTLY CLOUDY (40-50 PERCENT).
MAX TEMPERATURE.....62-65.
MIN HUMIDITY........21-24 PERCENT.

20 FOOT WINDS.......SOUTH SOUTHWEST 4-7 MPH BECOMING SOUTHWEST 8 TO 13 MPH
                    WITH GUSTS TO 20 MPH BETWEEN 1000 AND NOON...VEERING
                    WEST SOUTHWEST 10 TO 15 MPH WITH GUSTS 25 TO 30 MPH
                    IN THE AFTERNOON.
RIDGE TOP WINDS.....SOUTHWEST 20 TO 25 MPH VEERING WEST 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.......1900-2900 FT AGL INCREASING TO 5500-6500 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST 15 TO 25 MPH SHIFTING TO THE WEST
                    AROUND 25 MPH LATE IN THE AFTERNOON.
SMOKE DISPERSAL.....FAIR (41400 KNOT-FT) INCREASING TO VERY GOOD
                    (120100 KNOT-FT) IN THE AFTERNOON.

.TONIGHT...
SKY/WEATHER.........MOSTLY CLEAR (10-20 PERCENT).
MIN TEMPERATURE.....31-34.
MAX HUMIDITY........79-82 PERCENT.

20 FOOT WINDS.......WEST SOUTHWEST WINDS AROUND 10 MPH GUSTING TO 20 MPH UNTIL
                    SUNSET THEN DIMINISHING AND BECOMING SOUTH SOUTHWEST
                    4-7 MPH AFTER MIDNIGHT.
RIDGE TOP WINDS.....WEST 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.......5500-6500 FT AGL DECREASING TO 1900-2900 FT AGL
                    AFTER MIDNIGHT.
TRANSPORT WINDS.....WEST AROUND 20 MPH BECOMING SOUTHWEST 10
                    MPH AFTER MIDNIGHT.
SMOKE DISPERSAL.....VERY GOOD (107000 KNOT-FT) DECREASING TO POOR
                    (25500 KNOT-FT) AFTER MIDNIGHT.

.SATURDAY...
SKY/WEATHER.........SUNNY (5-15 PERCENT).
MAX TEMPERATURE.....68-71.
MIN HUMIDITY........22-25 PERCENT.
20 FOOT WINDS.......SOUTH SOUTHWEST 4-7 MPH BECOMING SOUTHWEST AROUND
                    10 MPH WITH GUSTS 15 TO 20 MPH IN THE AFTERNOON.
RIDGE TOP WINDS.....SOUTHWEST 10 TO 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.......1100-2100 FT AGL INCREASING TO 3100-4100 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST 8 TO 13 MPH.
SMOKE DISPERSAL.....POOR (14500-37800 KNOT-FT).

.FORECAST DAYS 3 THROUGH 5...
.SATURDAY NIGHT...CLEAR. LOWS IN THE MID 30S. WINDS GENERALLY
LESS THAN 10 MPH.

.SUNDAY...CLEAR. LOWS IN THE MID 30S. HIGHS IN THE MID 70S. WINDS
GENERALLY LESS THAN 10 MPH.

.MONDAY...MOSTLY CLEAR. LOWS IN THE UPPER 30S. HIGHS IN THE LOWER
70S. WINDS GENERALLY LESS THAN 10 MPH.

.TUESDAY...CLEAR. LOWS IN THE MID 30S. HIGHS IN THE LOWER 70S.
WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...MEUNIER
REQUESTED BY...LAURA DOOLEY
REASON FOR REQUEST...WILDFIRE
.TAG 20100923.ANTEL.02/RIW