FNUS75 KCYS 221245
FWSCYS

SPOT FORECAST FOR EAGLE ROCK...NATIONAL PARK SERVICE
NATIONAL WEATHER SERVICE CHEYENNE WY
645 AM MDT WED APR 22 2009

FORECAST IS BASED ON IGNITION TIME OF 1000 MDT ON APRIL 22.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
ALTHOUGH SKIES ARE CLEAR THIS MORNING...CLOUDS WILL BE ON THE
INCREASE THIS AFTERNOON...AS A WEAK DISTURBANCE MOVES OVER THE
BURN SITE. A FEW ISOLATED SHOWERS AND THUNDERSTORMS CAN BE EXPECTED
LATER THIS AFTERNOON AS A RESULT. ERRATIC AND GUSTY WINDS CAN BE
EXPECTED IN THE VICINITY OF THUNDERSTORMS. TEMPERATURES WILL TOP
OUT AGAIN IN THE MID TO UPPER 70S. THUNDERSTORMS WILL WANE TONIGHT
AS THE DISTURBANCE SHIFTS EAST...GIVING WAY TO DECENT HUMIDITY
RECOVERIES. WINDS WILL COME UP AGAIN THIS AFTERNOON...THOUGH
SHOULD BE LESS THAN YESTERDAY. WINDS WILL COME UP AGAIN ON THURSDAY
AFTERNOON...WITH TEMPERATURES INTO THE UPPER 70S ONCE AGAIN.

.TODAY...

SKY/WEATHER.........MOSTLY SUNNY UNTIL 1400...THEN PARTLY CLOUDY WITH
                    ISOLATED SHOWERS AND THUNDERSTORMS.
TEMPERATURE.........58 AT IGNITION...MAX 76-78.
RH..................35 PERCENT AT IGNITION...MIN AROUND 20 PERCENT.
WIND (20 FT)........VARIABLE AT LESS THAN 10 MPH UNTIL 1100...THEN SOUTHWEST
                    AT 15 TO 20 MPH WITH GUSTS TO 25 MPH. ERRATIC WINDS NEAR
                    THUNDERSTORMS.
CWR.................5 PERCENT AFTER 1400.
LAL.................1 UNTIL 1400...THEN 3.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH AT
                    IGNITION...MAX 4.
MIXING HEIGHT.......1000 FT AGL AT IGNITION...INCREASING TO 10000 FT AGL IN
                    THE AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST AT 10 MPH UNTIL 1200...THEN INCREASING TO 20
                    MPH.
SMOKE DISPERSAL.....POOR INCREASING TO EXCELLENT (135200-172900 KNOT-FT) IN
                    THE AFTERNOON.

.TONIGHT...

SKY/WEATHER.........PARTLY CLOUD WITH ISOLATED SHOWERS AND THUNDERSTORMS
                    UNTIL 2000...THEN MOSTLY CLEAR.
TEMPERATURE.........MIN 45-48.
RH..................MAX 65-70 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS OF 10 TO 15 MPH UNTIL 2100...THEN BECOMING
                    LIGHT AND VARIABLE OF LESS THAN 10 MPH.
CWR.................5 PERCENT UNTIL 2000.
LAL.................1.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......3800 FT AGL DECREASING TO 1000 FT AGL AFTER
                    MIDNIGHT.
TRANSPORT WINDS.....SOUTHWEST AT 15 TO 20 MPH UNTIL 2100...THEN DECREASING TO
                    10 MPH.
SMOKE DISPERSAL.....EXCELLENT (136200-161500 KNOT-FT) DECREASING TO
                    POOR (600-1600 KNOT-FT).

.THURSDAY...

SKY/WEATHER.........MOSTLY SUNNY THEN BECOMING PARTLY CLOUDY.
TEMPERATURE.........MAX 77-79.
RH..................MIN 17-21 PERCENT.
WIND (20 FT)........LIGHT AND VARIABLE OF LESS THAN 10 MPH UNTIL 1000...THEN
                    BECOMING WEST/SOUTHWEST AT 15 TO 20 MPH WITH GUSTS TO 25 MPH.
CWR.................0 PERCENT.
LAL.................1.
HAINES INDEX........4 OR  LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH TO OR MODERATE POTENTIAL
                    FOR LARGE PLUME DOMINATED FIRE GROWTH.
MIXING HEIGHT.......1500 FT AGL INCREASING TO 10300 FT AGL IN THE
                    AFTERNOON.
TRANSPORT WINDS.....WEST/SOUTHWEST AT 15 TO 25 MPH.
SMOKE DISPERSAL.....POOR (1100-1600 KNOT-FT) INCREASING TO EXCELLENT
                    (146800-187700 KNOT-FT) IN THE AFTERNOON.

$$

FORECASTER...HAHN
REQUESTED BY...ERIC ALLEN
TYPE OF REQUEST...PRESCRIBED
.TAG 20090422.EAGLE.01/CYS