FNUS75 KRIW 181848
FWSRIW

SPOT FORECAST FOR NORTON POINT...USFS
NATIONAL WEATHER SERVICE RIVERTON WY
1248 PM MDT THU AUG 18 2011

FORECAST IS BASED ON REQUEST TIME OF 1216 MDT ON AUGUST 18.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

...RED FLAG WARNING IN EFFECT UNTIL 9 PM MDT THIS EVENING...

.DISCUSSION...

HOT DRY AND WINDY INTO THE EARLY EVENING. A DRY COLD FRONT WILL PASS
THROUGH THE AREA AT AROUND 2100 THIS EVENING...RESULTING IN A SHIFT
IN WIND DIRECTION AND SPEED FROM WEST TO NORTH...HOWEVER BRIEF AS THE
FRONT WASHES OUT IN THE VICINITY OVERNIGHT...RETURNING FLOW TO
DRAINAGE DOMINANT. A MORE SUBSTANTIAL COLD FRONT WILL DROP SOUTH ON
FRIDAY...DROPPING TEMPS RHS...NO PRECIPITATION IS EXPECTED.

INVERSIONS WILL FORM AGAIN OVERNIGHT WITH GOOD RH RECOVERY IN THE LOWER
ELEVATIONS AND FAIR RECOVERY AT MID SLOPE...BREAKING DURING THE MID TO
LATE MORNING HOURS.

RIDGING BRIEFLY BUILDS BACK IN ON SATURDAY RAISING TEMPERATURES AND
LOWERING RHS FOR THE DAY. THE RIDGE WILL FLATTEN ON SUNDAY AS A
SHORT WAVE TROUGH MOVES BY...INCREASING THE CHANCE FOR SHOWERS AND
THUNDERSTORMS ON SUNDAY WITH GUSTY WINDS AND FREQUENT LIGHTNING BEING
THE PRIMARY THREATS...CHANCE OF WETTING RAIN WILL REMAIN LOW.

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

FORECASTER...ALLEN

.TONIGHT...
SKY/WEATHER.........PARTLY CLOUDY (20-30 PERCENT) BECOMING CLEAR
                    (5-15 PERCENT).
MIN TEMPERATURE.....35-39.
MAX HUMIDITY........67-72 PERCENT EXCEPT 35 TO 45 PERCENT AT MID
                    SLOPE.
20 FOOT WINDS.......WEST WINDS 10 TO 13 MPH WITH GUSTS TO AROUND
                    25 MPH EARLY IN THE EVENING BECOMING
                    DOWNSLOPE/DOWNVALLEY 4-7 MPH AFTER 2000.
RIDGE TOP WINDS.....WEST 15 TO 25 MPH SHIFTING TO THE SOUTHWEST
                    AROUND 20 MPH TOWARD MORNING.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.

.FRIDAY...
SKY/WEATHER.........MOSTLY SUNNY (10-20 PERCENT) BECOMING PARTLY
                    CLOUDY (30-40 PERCENT) IN THE AFTERNOON.
MAX TEMPERATURE.....72-75.
MIN HUMIDITY........12-15 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH BECOMING WEST AROUND
                    12 MPH WITH GUSTS TO 20 MPH LATE IN THE AFTERNOON.
RIDGE TOP WINDS.....WEST 10 TO 15 MPH INCREASING TO AROUND 20 MPH
                    LATE IN THE AFTERNOON.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.

.FORECAST DAYS 3 THROUGH 5...
.FRIDAY NIGHT...MOSTLY CLEAR. LOWS IN THE UPPER 30S. WINDS
GENERALLY LESS THAN 10 MPH.
.SATURDAY...MOSTLY CLEAR. LOWS IN THE UPPER 30S. HIGHS IN THE LOWER
70S. WINDS GENERALLY LESS THAN 10 MPH.
.SUNDAY...PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS IN THE LOWER 40S. HIGHS IN THE MID 70S. WINDS
GENERALLY LESS THAN 10 MPH.
.MONDAY...MOSTLY CLEAR. LOWS IN THE LOWER 40S. HIGHS IN THE MID
70S. WINDS GENERALLY LESS THAN 10 MPH.
.TUESDAY...MOSTLY CLEAR. LOWS IN THE UPPER 30S. HIGHS IN THE MID
70S. WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...ALLEN
REQUESTED BY...ASHLEY POWELL
REASON FOR REQUEST...WILDFIRE
.TAG 20110818.NORTO.01/RIW