FNUS75 KRIW 181957
FWSRIW

SPOT FORECAST FOR CATHEDRAL GROUP...IA TDC
NATIONAL WEATHER SERVICE RIVERTON WY
157 PM MDT SUN JUL 18 2010

FORECAST IS BASED ON REQUEST TIME OF 1324 MDT ON JULY 18.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...

WEAK LOW PRESSURE WILL MOVE ACROSS SOUTHWEST CANADA TODAY THROUGH
MONDAY. WEST WINDS WILL PREDOMINATE THIS AFTERNOON AND AGAIN MONDAY
AFTERNOON...BUT HIGHER ELEVATIONS TO THE WEST WILL SHELTER THE AREA
OF THE FIRE. WEST WIND WILL GUST TO NEAR 20 MPH AFTER 1500
TODAY...AND LIGHTER RIDGE TOP WIND MONDAY SHOULD KEEP AFTERNOON WEST
WINDS AROUND 10 MPH. THERE WILL BE SUFFICIENT INSTABILITY AND
MOISTURE FOR ISOLATED AFTERNOON SHOWERS AND THUNDERSTORMS THIS
AFTERNOON. THE MAIN THREAT WITH ANY THUNDERSTORMS WILL BE GUSTY
OUTFLOW WINDS...AND THE CHANCE OF WETTING RAIN WILL BE VERY LOW.
DRIER AIR WILL MOVE INTO THE REGION MONDAY...AND SHOWERS AND
THUNDERSTORMS ARE EXPECTED TO FORM TO THE NORTH OF THE AREA IN
YELLOWSTONE NATIONAL PARK.

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

FORECASTER...SMITH

.THIS AFTERNOON...
SKY/WEATHER.........PARTLY CLOUDY (35-45 PERCENT). ISOLATED SHOWERS
                    AND THUNDERSTORMS.
MAX TEMPERATURE.....79-82.
MIN HUMIDITY........19-22 PERCENT.
WIND (20 FT)........UPSLOPE/UPVALLEY 5-9 MPH BECOMING...THEN WEST 8 TO 12
                    MPH WITH GUSTS TO AROUND 20 MPH AFTER 1500 MDT.
                    GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS
                    IN THE AFTERNOON.
RIDGE TOP WINDS.....WEST 15 MPH.
LAL.................2.
CWR.................3 PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......6500-7500 FT AGL.
TRANSPORT WINDS.....WEST 15 TO 20 MPH.
SMOKE DISPERSAL.....EXCELLENT (159600 KNOT-FT).

.TONIGHT...
SKY/WEATHER.........MOSTLY CLEAR (10-15 PERCENT).
MIN TEMPERATURE.....46-49.
MAX HUMIDITY........75-78 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 5 TO 10 MPH WITH GUSTS TO
                    AROUND 15 MPH IN THE EVENING BECOMING
                    DOWNSLOPE/DOWNVALLEY 4-7 MPH.
RIDGE TOP WINDS.....WEST 15 MPH DECREASING TO AROUND 10 MPH
                    EARLY IN THE MORNING.
LAL.................1.
CWR.................ZERO PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......5500-6000 FT AGL DECREASING TO 1500-2000 FT AGL
                    AFTER MIDNIGHT.
TRANSPORT WINDS.....WEST 15 MPH DECREASING TO AROUND 10 MPH
                    EARLY IN THE MORNING.
SMOKE DISPERSAL.....EXCELLENT (152000 KNOT-FT) DECREASING TO FAIR
                    (53200 KNOT-FT) AFTER MIDNIGHT.

.MONDAY...
SKY/WEATHER.........MOSTLY SUNNY (10-20 PERCENT) THEN BECOMING
                    PARTLY CLOUDY (35-45 PERCENT).
MAX TEMPERATURE.....AROUND 80.
MIN HUMIDITY........16-19 PERCENT.
WIND (20 FT)........UPSLOPE/UPVALLEY 5-9 MPH BECOMING WEST AROUND 10 MPH.
RIDGE TOP WINDS.....WEST AROUND 15 MPH.
LAL.................1.
CWR.................LESS THAN 5 PERCENT.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......2000-3000 FT AGL INCREASING TO 5500-6500 FT AGL
                    IN THE AFTERNOON.
TRANSPORT WINDS.....WEST 15 MPH.
SMOKE DISPERSAL.....FAIR (49200 KNOT-FT) INCREASING TO VERY GOOD
                    (142700 KNOT-FT) IN THE AFTERNOON.

.FORECAST DAYS 3 THROUGH 5...
.MONDAY NIGHT...PARTLY CLOUDY. LOWS AROUND 40. WINDS GENERALLY
LESS THAN 10 MPH.
.TUESDAY...MOSTLY CLEAR. LOWS IN THE LOWER 40S. HIGHS IN THE MID
70S. WINDS GENERALLY LESS THAN 10 MPH.
.WEDNESDAY...MOSTLY CLEAR. LOWS IN THE MID 40S. HIGHS IN THE
LOWER 80S. WINDS GENERALLY LESS THAN 10 MPH.
.THURSDAY...MOSTLY CLEAR. LOWS IN THE LOWER 40S. HIGHS AROUND 80.
WINDS GENERALLY LESS THAN 10 MPH.

$$

FORECASTER...SMITH
REQUESTED BY...RON STEFFFENS
REASON FOR REQUEST...WILDFIRE
.TAG 20100718.CATHE.01/RIW