FNUS75 KRIW 090131
FWSRIW

SPOT FORECAST FOR LOWER GROS VENTRE RX...USFS
NATIONAL WEATHER SERVICE RIVERTON WY
731 PM MDT SUN APR 8 2012

FORECAST IS BASED ON IGNITION TIME OF 1300 MDT ON APRIL 09.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...DRY WEATHER IS FORECAST MONDAY AND TUESDAY. MORNING
WIND SPEEDS WILL BE FAIRLY LIGHT THE NEXT TWO DAYS. AS THE TERRAIN
HEATS UP EACH DAY...ONE WOULD EXPECT AN UPVALLEY OR UPSLOPE TO OCCUR
BY LATE MORNING AND THIS BREEZE WILL CONTINUE THROUGH LATE AFTERNOON.
THE WIND WILL BE A LITTLE HIGHER NEAR AND OVER THE RIDGETOPS EACH
AFTERNOON. THE WIND WILL SUBSIDE ONCE EVENING OCCURS WITH A LIGHT
DOWNSLOPE WIND OCCURRING AT NIGHT. LOW LEVEL INVERSION IS EXPECTED
MONDAY NIGHT AND TUESDAY NIGHT DUE TO RADIATIONAL COOLING DUE TO A
MOSTLY CLEAR SKY AND A FAIRLY DRY AIRMASS. THIS INVERSION SHOULD
BREAK BY LATE MORNING DUE TO THE DAYTIME HEATING AND THEN SMOKE
DISPERSAL IMPROVES TO THE GOOD CATEGORY EACH AFTERNOON UNTIL ABOUT
SUNSET.

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

FORECASTER...AR

.TODAY (MONDAY)...
SKY/WEATHER.........MOSTLY SUNNY.

MAX TEMPERATURE.....60-65 AT 7000 FEET
                    AROUND 50 AT 9000 FEET.

MIN HUMIDITY........13-18 PERCENT AT 7000 FEET.
                    17-22 PERCENT AT 9000 FEET.

20 FOOT WINDS.......VARIABLE AT 3 TO 6 MPH UNTIL 1200.
                    THEN SOUTHWEST TO WEST AT 6 TO 10 MPH WITH GUSTS
                    TO 14 MPH AFTER 1200.

RIDGE TOP WINDS.....BECOMING SOUTH TO SOUTHWEST AT 5 TO 10 MPH BY 1200.
                    THEN SOUTHWEST TO WEST AT 9 TO 13 MPH WITH GUSTS
                    TO 17 MPH AFTER 1300.

HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......INCREASING TO 4500-5500 FT AGL IN THE AFTERNOON.

TRANSPORT WINDS.....BECOMING SOUTH TO SOUTHWEST AT 10 TO 15 MPH
                    AFTER 1300.

SMOKE DISPERSAL.....POOR...BECOMING FAIR AFTER 1100...BECOMING GOOD
                    AFTER 1400.


.TONIGHT...
SKY/WEATHER.........MOSTLY CLEAR.

MIN TEMPERATURE.....22-27 AT 7000 FEET.
                    27-32 AT 9000 FEET.

MAX HUMIDITY........70-75 AT 7000 FEET.
                    60-65 AT 9000 FEET.

20 FOOT WINDS.......WEST TO SOUTHWEST AT 6 TO 10 MPH WITH GUSTS TO 13 MPH
                    UNTIL 1900.  THEN WEST TO SOUTHWEST AT 5 TO 8 MPH
                    AFTER 1900 UNTIL 2300.  THEN DOWNSLOPE/DOWNVALLEY
                    AT 3 TO 6 MPH MPH AFTER 2300.

RIDGE TOP WINDS.....WEST TO SOUTHWEST AT 8 TO 12 MPH WITH GUSTS TO 16 MPH
                    UNTIL 1900.  THEN WEST TO SOUTHWEST AT 5 TO 10 MPH
                    AFTER 1900 UNTIL 2300.  THEN SOUTH TO SOUTHWEST AT
                    4 TO 7 MPH AFTER 2300.

HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......DECREASING TO UNDER 1000 FEET AFTER MIDNIGHT.

TRANSPORT WINDS.....SOUTHWEST 10 TO 15 MPH UNTIL 1900.
                    THEN SOUTH TO SOUTHWEST AT 5 TO 10 MPH BY 2000
                    AND OVERNIGHT.

SMOKE DISPERSAL.....GOOD UNTIL SUNSET...THEN FAIR...BECOMING POOR AROUND
                    MIDNIGHT.

.TUESDAY...
SKY/WEATHER.........MOSTLY SUNNY.

MAX TEMPERATURE.....62-67 AT 7000 FEET.
                    50-55 AT 9000 FEET.

MIN HUMIDITY........13-18 PERCENT AT 7000 FEET.
                    17-22 PERCENT AT 9000 FEET.

20 FOOT WINDS.......VARIABLE AT 3 TO 6 MPH UNTIL 1200.
                    THEN SOUTHWEST TO WEST AT 6 TO 10 MPH WITH GUSTS
                    TO 14 MPH AFTER 1200.

RIDGE TOP WINDS.....BECOMING SOUTH TO SOUTHWEST AT 5 TO 10 MPH BY 1200.
                    THEN SOUTHWEST TO WEST AT 10 TO 14 MPH WITH GUSTS
                    TO 18 MPH AFTER 1300.

HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......INCREASING TO 5000-6000 FT AGL IN THE AFTERNOON.

TRANSPORT WINDS.....SOUTH TO SOUTHWEST AT 5 TO 10 MPH BY 1200.
                    SOUTH TO SOUTHWEST AROUND 15 MPH AFTER 1200.

SMOKE DISPERSAL.....POOR...BECOMING FAIR AFTER 1100...BECOMING GOOD
                    AFTER 1400.

.FORECAST DAYS 3 THROUGH 5...

.TUESDAY NIGHT...PARTLY CLOUDY. LOWS 25 TO 30.
WINDS LESS THAN 10 MPH AFTER SUNSET.

.WEDNESDAY...PARTLY CLOUDY. CHANCE OF AFTERNOON RAIN SHOWERS.
HIGHS AROUND 60.  AFTERNOON SOUTHWEST WINDS 10 TO 15 MPH WITH GUSTS
AROUND 20 MPH.

.THURSDAY...COLDER. MOSTLY CLOUDY. CHANCE OF RAIN AND SNOW SHOWERS.
A SLIGHT CHANCE OF AFTERNOON THUNDERSTORMS.  LOWS IN THE MID 20S.
HIGHS IN THE LOWER 40S.  WEST TO SOUTHWEST WINDS 10 TO 15 MPH.

.FRIDAY...PARTLY CLOUDY WITH CHANCE OF RAIN AND SNOW SHOWERS.
LOWS IN THE MID 20S. HIGHS IN THE MID 40S. WINDS GENERALLY LESS
THAN 10 MPH.

$$

FORECASTER...ROSS
REQUESTED BY...JASON LAWHON
REASON FOR REQUEST...PRESCRIBED
.TAG 20120408.LOWER.01/RIW