FNUS75 KRIW 211157
FWSRIW

SPOT FORECAST FOR LOWER GROS VENTRE RX...IA TDC
NATIONAL WEATHER SERVICE RIVERTON WY
557 AM MDT TUE SEP 21 2010

FORECAST IS BASED ON IGNITION TIME OF 1815 MDT ON SEPTEMBER 20.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...

A DRY AND MILD DAY WILL OCCUR TODAY. TEMPERATURES ARE EXPECTED TO
BE SLIGHTLY WARMER...AND AFTERNOON RELATIVE HUMIDITY SLIGHTLY
LOWER THAN WHAT OCCURRED YESTERDAY. A TROUGH WILL AFFECT WESTERN
WYOMING WEDNESDAY DRAWING UP SOME MOISTURE...WITH A CHANCE OF
SEEING SOME SHOWER ACTIVITY AND PERHAPS A THUNDERSTORM LATE
WEDNESDAY AFTERNOON INTO WEDNESDAY NIGHT. THE CHANCE OF A WETTING
RAIN REMAINS VERY LOW FOR THIS EVENT.

WELL ABOVE AVERAGE TEMPERATURES AND VERY LOW RH ARE EXPECTED TO
RETURN THIS WEEKEND. HOWEVER...WINDS ARE EXPECTED TO BE SIGNIFICANTLY
WEAKER THAN WHAT OCCURRED LAST WEEKEND.

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

FORECASTER...MURRELL

.TODAY...
SKY/WEATHER.........MOSTLY SUNNY (15-25 PERCENT).
MAX TEMPERATURE.....65-69 AT 7500 FEET. 57-61 AT 9000 FEET.
MIN HUMIDITY........17-21 PERCENT 7500 FEET. 23-27 PERCENT 9000 FEET.
20 FOOT WINDS.......EAST SOUTHEAST 3-7 MPH...BECOMING SOUTH 5-10 MPH
                    BETWEEN 1000 AND NOON...THEN SWITCHING TO THE
                    SOUTHWEST AND INCREASING TO 9-13 MPH AROUND 1400.
                    GUSTS 20-25 MPH IN THE AFTERNOON.
RIDGE TOP WINDS.....SOUTH AROUND 10 MPH...BECOMING SOUTHWEST AROUND 15
                    MPH BY NOON. GUSTS 25-30 MPH IN THE AFTERNOON.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......1500 FT AGL INCREASING TO 6400 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST 15 TO 20 MPH.
SMOKE DISPERSAL.....POOR (24700 KNOT-FT) INCREASING TO VERY GOOD
                    (113400 KNOT-FT) IN THE AFTERNOON.

.TONIGHT...
SKY/WEATHER.........MOSTLY CLEAR (10-20 PERCENT).
MIN TEMPERATURE.....40-45.
MAX HUMIDITY........45-50 PERCENT.
20 FOOT WINDS.......SOUTH SOUTHWEST 5-10 MPH...BECOMING DOWNSLOPE
                    DOWNVALLEY 3-6 MPH BY 2000. GUSTS UP TO 20
                    MPH BEFORE 2000.
RIDGE TOP WINDS.....SOUTHWEST AROUND 15 MPH BECOMING SOUTH 5-10
                    MPH AROUND 2000.
LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......3400-4400 FT AGL DECREASING TO 600 FT AGL
                    AROUND 2100.
TRANSPORT WINDS.....SOUTHWEST AROUND 15 MPH BECOMING SOUTH 5-10
                    MPH AROUND 2000.
SMOKE DISPERSAL.....GOOD (61400 KNOT-FT) DECREASING TO POOR (1700
                    KNOT-FT) AROUND 2000.

.WEDNESDAY...
SKY/WEATHER.........PARTLY CLOUDY (40 PERCENT)...BECOMING MOSTLY
                    CLOUDY (70-80 PERCENT) AFTER 1500. ISOLATED SHOWERS
                    AND THUNDERSTORMS...MAINLY AFTER 1500.
MAX TEMPERATURE.....63-67.
MIN HUMIDITY........24-28 PERCENT.
20 FOOT WINDS.......EAST SOUTHEAST 3-6 MPH...BECOMING SOUTH TO SOUTHWEST
                    8-12 MPH BETWEEN 1100 AND 1300. GUSTS AROUND 20 MPH
                    IN THE AFTERNOON. GUSTY AND ERRATIC WINDS EXPECTED
                    NEAR THUNDERSTORMS IN THE AFTERNOON.
RIDGE TOP WINDS.....SOUTHWEST 10 TO 15 MPH.
LAL.................1 UNTIL 1200...THEN 2.
CHC OF WETTING RAIN.3 PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......2500 FT AGL INCREASING TO 9500 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTH SOUTHWEST AROUND 15 MPH SHIFTING TO THE SOUTHWEST
                    15 TO 20 MPH IN THE LATE MORNING AND AFTERNOON.
SMOKE DISPERSAL.....FAIR (42000 KNOT-FT) INCREASING TO EXCELLENT
                    (195600 KNOT-FT) IN THE AFTERNOON.

.FORECAST DAYS 3 THROUGH 5...
.WEDNESDAY NIGHT...PARTLY CLOUDY. ISOLATED SHOWERS AND
THUNDERSTORMS IN THE EVENING...THEN SLIGHT CHANCE OF RAIN AFTER
MIDNIGHT. LOWS IN THE UPPER 30S. WINDS GENERALLY LESS THAN
10 MPH.

.THURSDAY...PARTLY CLOUDY. LOWS IN THE MID 30S. HIGHS IN THE
LOWER 60S. WINDS GENERALLY LESS THAN 10 MPH.

.FRIDAY...MOSTLY CLEAR. LOWS IN THE MID 30S. HIGHS IN THE MID
60S. WINDS GENERALLY LESS THAN 10 MPH.

.SATURDAY...MOSTLY CLEAR. LOWS IN THE LOWER 40S. HIGHS IN THE
LOWER 70S. WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...MURRELL
REQUESTED BY...STRAUBURG
REASON FOR REQUEST...PRESCRIBED
.TAG 20100920.LOWER.01/RIW