FNUS75 KRIW 181008
FWSRIW

SPOT FORECAST FOR DRY ISLAND...NATIONAL PARK SERVICE
NATIONAL WEATHER SERVICE RIVERTON WY
408 AM MDT MON OCT 18 2010

FORECAST IS BASED ON REQUEST TIME OF 1922 MDT ON OCTOBER 17.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...A RIDGE OF HIGH PRESSURE WILL BUILD IN TODAY AND PERSIST
THROUGH THURSDAY.  TEMPERATURES WILL SHOW LITTLE TREND TODAY AND TUESDAY WITH
RELATIVE HUMIDITY TRENDING DRIER THROUGH THE PERIOD.  WINDS WILL BE LIGHT WITH
NORTH TO NORTHWEST WIND IN THE AFTERNOON AND EVENING.


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

FORECASTER...MEUNIER

.TODAY...
SKY/WEATHER.........PARTLY CLOUDY THROUGH 1000 THEN BECOMING
                    MOSTLY SUNNY (10-20 PERCENT).
MAX TEMPERATURE.....60-63.
MIN HUMIDITY........20-23 PERCENT.

20 FOOT WINDS.......LIGHT PRIMARILY NORTH NORTHEAST 4-7 MPH IN THE MORNING
                    BECOMING NORTHWEST 5-9 MPH IN THE AFTERNOON.
RIDGE TOP WINDS.....NORTH NORTHEAST AROUND 5 MPH IN THE MORNING BECOMING
                    NORTHWEST 5 TO 10 MPH IN THE AFTERNOON.

LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.

MIXING HEIGHT.......2500-3500 FT AGL INCREASING TO 5200-6200 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....NORTHWEST 5 TO 10 MPH.
SMOKE DISPERSAL.....POOR (17900 KNOT-FT) INCREASING TO GOOD (77500
                    KNOT-FT) IN THE AFTERNOON.

.TONIGHT...
SKY/WEATHER.........MOSTLY CLEAR (10-20 PERCENT).
MIN TEMPERATURE.....24-27.
MAX HUMIDITY........87-90 PERCENT.

20 FOOT WINDS.......NORTHWEST 5 TO 9 MPH THROUGH 1900 BECOMING DOWNSLOPE
                    DOWN VALLEY 4-7 MPH AFTER SUNSET.
RIDGE TOP WINDS.....NORTHWEST AROUND 10 MPH.

LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.

MIXING HEIGHT.......3500-4500 FT AGL DECREASING TO 1400 FT AGL
                    AFTER 2100.
TRANSPORT WINDS.....NORTHWEST 10 MPH.
SMOKE DISPERSAL.....GOOD (73900 KNOT-FT) DECREASING TO POOR (14800
                    KNOT-FT) AFTER 2100.

.TUESDAY...
SKY/WEATHER.........MOSTLY SUNNY (10-20 PERCENT).
MAX TEMPERATURE.....60-63.
MIN HUMIDITY........18-21 PERCENT.

20 FOOT WINDS.......LIGHT PRIMARILY NORTH NORTHEAST 4-7 MPH IN THE MORNING
                    BECOMING NORTHWEST 5-10 MPH WITH GUSTS TO 15 MPH
                    IN THE AFTERNOON.
RIDGE TOP WINDS.....NORTHWEST 10 TO 15 MPH.

LAL.................1.
CHC OF WETTING RAIN.ZERO PERCENT.
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.

MIXING HEIGHT.......3000-4000 FT AGL.
TRANSPORT WINDS.....NORTHWEST 10 TO 15 MPH.
SMOKE DISPERSAL.....POOR TO GOOD.

.FORECAST DAYS 3 THROUGH 5...
.TUESDAY NIGHT...MOSTLY CLEAR. LOWS IN THE MID 20S. WINDS
GENERALLY LESS THAN 10 MPH.

.WEDNESDAY...MOSTLY CLEAR. LOWS IN THE MID 20S. HIGHS IN THE
LOWER 60S. WINDS GENERALLY LESS THAN 10 MPH.

.THURSDAY...MOSTLY CLEAR. LOWS IN THE UPPER 20S. HIGHS IN THE MID
50S. WINDS GENERALLY LESS THAN 10 MPH.

.FRIDAY...MOSTLY CLEAR. LOWS IN THE MID 20S. HIGHS IN THE MID
50S. WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...MEUNIER
REQUESTED BY...LANCASTER
REASON FOR REQUEST...WILDFIRE
.TAG 20101017.DRYIS.01/RIW