FNUS75 KRIW 281153
FWSRIW

SPOT FORECAST FOR GRAVEL...IA TDC
NATIONAL WEATHER SERVICE RIVERTON WY
553 AM MDT SAT AUG 28 2010

FORECAST IS BASED ON REQUEST TIME OF 1618 MDT ON AUGUST 27.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...A MOIST AND UNSTABLE SW FLOW WILL CONTINUE TO FEED UP
AHEAD OF A SLOW-MOVING COLD FRONT ACROSS IDAHO.  EXPECT ISOLATED SHOWERS
THIS MORNING WITH SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS
THIS AFTERNOON AND EVENING.  A DRIER AIRMASS WILL PUSH IN BRIEFLY AFTER
MIDNIGHT TONIGHT WITH THE COLD FRONT PUSHING THROUGH AND BRINGING
ANOTHER ROUND OF SHOWERS AND THUNDERSTORMS MAINLY SUNDAY AFTERNOON AND
SUNDAY EVENING WITH RAIN SHOWERS MIXED WITH OR CHANGING TO SNOW MONDAY
AS A MUCH COLDER AIRMASS PUSHES IN.

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

FORECASTER...MEUNIER

.TODAY...
SKY/WEATHER.........MOSTLY CLOUDY (70-80 PERCENT). ISOLATED
                    SHOWERS IN THE MORNING. SCATTERED SHOWERS
                    AND ISOLATED THUNDERSTORMS IN THE AFTERNOON.
MAX TEMPERATURE.....66-69.
MIN HUMIDITY........34-37 PERCENT.
20 FOOT WINDS.......SOUTH/SOUTHEAST 4-7 MPH IN THE MORNING
                    BECOMING SOUTH SOUTHWEST 8 TO 13 MPH
                    WITH GUSTS NEAR 20 MPH BETWEEN NOON
                    AND 1400L.  GUSTY AND ERRATIC
                    WIND NEAR THUNDERSTORMS.
RIDGE TOP WINDS.....SOUTH 10 TO 15 MPH.
LAL.................2 UNTIL 1200...THEN 4.
CHC OF WETTING RAIN.10 PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......3600-4600 FT AGL INCREASING TO 5800-6800 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTH SOUTHEAST 5 TO 10 MPH THIS MORNING
                    BECOMING SOUTH SOUTHWEST 25 TO 30 MPH IN
                    THE AFTERNOON.
SMOKE DISPERSAL.....FAIR TO GOOD IN THE MORNING...BECOMING EXCELLENT IN THE
                    AFTERNOON.

.TONIGHT...
SKY/WEATHER.........MOSTLY CLOUDY (70-80 PERCENT) WITH. SCATTERED SHOWERS
                    AND ISOLATED THUNDERSTORMS IN THE EVENING...THEN PARTLY
                    CLOUDY (30-40) PERCENT WITH ISOLATED SHOWERS AFTER
                    MIDNIGHT.
MIN TEMPERATURE.....41-44.
MAX HUMIDITY........75-78 PERCENT.
20 FOOT WINDS.......SOUTH SOUTHWEST 8 TO 13 MPH WITH GUSTS NEAR 20 MPH
                    UNTIL SUNSET BECOMING EAST SOUTHEAST 5-9 MPH
                    AT DUSK.  GUSTY AND ERRATIC WIND NEAR THUNDERSTORMS.
RIDGE TOP WINDS.....SOUTH 15 TO 20 MPH...GUSTS 25 TO 30 MPH UNTIL
                    SUNSET.
LAL.................3 UNTIL 2400...THEN 2.
CHC OF WETTING RAIN.20 PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......2200-3200 FT AGL DECREASING TO 400 FT AGL AFTER
                    MIDNIGHT.
TRANSPORT WINDS.....SOUTH 20 TO 25 MPH.
SMOKE DISPERSAL.....POOR TO FAIR (7000-43400 KNOT-FT).

.SUNDAY...
SKY/WEATHER.........PARTLY CLOUDY (55-65 PERCENT) THEN BECOMING
                    MOSTLY CLOUDY (65-75 PERCENT). ISOLATED
                    THUNDERSTORMS IN THE MORNING. SCATTERED AND
                    THUNDERSTORMS IN THE AFTERNOON.
MAX TEMPERATURE.....62-65.
MIN HUMIDITY........39-42 PERCENT.
20 FOOT WINDS.......SOUTH/SOUTHEAST 4-7 MPH IN THE MORNING
                    BECOMING SOUTHWEST 10 TO 15 MPH
                    WITH GUSTS 20 TO 25 MPH BETWEEN NOON
                    AND 1400L...THEN SHIFTING WEST WITH FRONTAL
                    PASSAGE BETWEEN 1600 AND 1800L.  GUSTY AND ERRATIC
                    WIND NEAR THUNDERSTORMS.
RIDGE TOP WINDS.....SOUTH 15 TO 20 MPH SHIFTING TO THE SOUTHWEST
                    AROUND 25 MPH LATE IN THE AFTERNOON.
LAL.................2 UNTIL 1200...THEN 3.
CHC OF WETTING RAIN.30 PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......4800-5800 FT AGL INCREASING TO 8400-9400 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTH AROUND 17 MPH INCREASING TO SOUTHWEST 30
                    TO 35 MPH IN THE LATE MORNING AND AFTERNOON.
SMOKE DISPERSAL.....VERY GOOD (134800 KNOT-FT) INCREASING TO
                    EXCELLENT (210300 KNOT-FT) IN THE AFTERNOON.

.FORECAST DAYS 3 THROUGH 5...
.SUNDAY NIGHT...NUMEROUS SHOWERS AND THUNDERSTORMS IN THE
EVENING...THEN NUMEROUS SHOWERS AND SNOW SHOWERS AFTER MIDNIGHT.
LOWS IN THE MID 30S. WINDS GENERALLY LESS THAN 10 MPH.
.MONDAY...COOLER. MOSTLY CLOUDY. SCATTERED SHOWERS...SNOW SHOWERS
AND ISOLATED THUNDERSTORMS. LOWS IN THE LOWER 30S. HIGHS IN THE
MID 50S. WINDS GENERALLY LESS THAN 10 MPH.
.TUESDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND
ISOLATED THUNDERSTORMS. LOWS AROUND 30. HIGHS IN THE MID 50S.
WINDS GENERALLY LESS THAN 10 MPH.
.WEDNESDAY...MOSTLY CLEAR. LOWS IN THE LOWER 30S. HIGHS IN THE
LOWER 60S. WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...MEUNIER
REQUESTED BY...TIDC
REASON FOR REQUEST...WILDFIRE
.TAG 20100827.GRAVE.02/RIW