Issued by NWS Riverton, WY
Versions: 1
000
FNUS75 KRIW 201503
FWSRIW
SPOT FORECAST FOR MUDDY MOUNTAIN SLASH DISPOSAL...BLM CAD
NATIONAL WEATHER SERVICE RIVERTON WY
903 AM MDT MON OCT 20 2008
FORECAST IS BASED ON IGNITION TIME OF 1030 MDT ON OCTOBER 20.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
.DISCUSSION...
A WEAK PACIFIC TROUGH MOVING INTO SOUTHWEST WYOMING TODAY WILL PROVIDE
ENOUGH MOISTURE AND INSTABILITY FOR ISOLATED SHOWERS AND AFTERNOON
THUNDERSTORMS. THE WEAK TROUGH WILL BE FOLLOWED BY A VIGOROUS AND
COLD UPPER LEVEL TROUGH ON TUESDAY. THE TROUGH WILL BE ACCOMPANIED
BY A STRONG SURFACE COLD FRONT THAT IS EXPECTED TO MOVE FROM NORTH
TO SOUTH THROUGH THE MUDDY MOUNTAIN AREA DURING THE EARLY TUESDAY
AFTERNOON. THE FRONT WILL BE FOLLOWED BY WIDESPREAD MODERATE TO
HEAVY SNOWFALL TUESDAY AFTERNOON AND EVENING. 4 TO 7 INCHES OF SNOW
ACCUMULATION IS EXPECTED BY LATE TUESDAY EVENING. STRONG AND
GUSTY NORTH TO NORTHWEST WIND WILL ACCOMPANY THE SNOW WITH PLENTY OF
BLOWING AND DRIFTING OCCURRING.
...THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS...
...HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT...
FORECASTER...CHURCH
.TODAY...
SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT) IN THE MORNING
THEN BECOMING PARTLY CLOUDY (55-65 PERCENT)
IN THE AFTERNOON. PATCHY FOG IN THE MORNING.
ISOLATED SNOW SHOWERS IN THE MORNING. ISOLATED
RAIN SHOWERS THROUGH THE DAY. AN ISOLATED
THUNDERSTORM IS POSSIBLE THIS AFTERNOON AND EARLY
EVENING.
MAX TEMPERATURE.....52-55.
MIN HUMIDITY........42-47 PERCENT.
20 FOOT WINDS.......UPSLOPE/UPVALLEY 2-5 MPH BECOMING SOUTHWEST 7 TO
12 MPH DURING THE LATE MORNING. GUSTS UP TO 15 MPH
INCREASING TO 20 MPH IN THE AFTERNOON.
RIDGE TOP WINDS.....SOUTHWEST 15 TO 20 MPH.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED
FIRE GROWTH.
LAL.................1 IN THE MORNING. 2 IN THE AFTERNOON.
MIXING HEIGHT.......2100 FT AGL IN THE MORNING INCREASING TO 4500 FT
AGL IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST 15 TO 20 MPH.
SMOKE DISPERSAL.....POOR (24300 KNOT-FT) INCREASING TO GOOD (74400 KNOT-
FT) IN THE AFTERNOON.
.TONIGHT...
SKY/WEATHER.........MOSTLY CLOUDY (60-70 PERCENT). ISOLATED SHOWERS DURING
THE EVENING.
MIN TEMPERATURE.....39-43.
MAX HUMIDITY........72-76 PERCENT.
20 FOOT WINDS.......WEST WINDS 13 TO 17 MPH WITH GUSTS TO 25 MPH.
RIDGE TOP WINDS.....WEST 20 TO 25 MPH AFTER MIDNIGHT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE
GROWTH.
MIXING HEIGHT.......600-1600 FT AGL.
TRANSPORT WINDS.....WEST 20 TO 25 MPH. SMOKE DISPERSAL.....POOR
(12400-30100 KNOT-FT).
.FORECAST DAYS 2 THROUGH 5...
.TUESDAY...BECOMING MUCH COLDER DURING THE AFTERNOON. CLOUDY. SNOW
LIKELY IN THE AFTERNOON. 4 TO 7 INCHES OF ACCUMULATION. LOWS AROUND 19.
WEST/SOUTHWEST WINDS 15 TO 20 MPH WITH GUSTS TO 25 MPH NORTH TO NORTHWEST
WINDS AROUND 15 TO 20 MPH WITH GUSTS TO 28 MPH.
.WEDNESDAY...MOSTLY CLEAR. LOWS IN THE LOWER 20S. HIGHS IN THE
UPPER 30S. NORTHWEST WINDS 10 TO 15 MPH.
.THURSDAY...WARMER. MOSTLY CLEAR. LOWS IN THE UPPER 20S. HIGHS
AROUND 50. WINDS GENERALLY LESS THAN 10 MPH.
.FRIDAY...MOSTLY CLEAR. LOWS AROUND 30. HIGHS IN THE LOWER 50S.
WEST WINDS AROUND 10 MPH.
$$
FORECASTER...CHURCH
REQUESTED BY...CRAIG SHORT
REASON FOR REQUEST...PRESCRIBED
.TAG 20081020.MUDDY.01/RIW
