FNUS75 KCYS 091557
FWSCYS

SPOT FORECAST FOR ILLINOIS CREEK...USFS
NATIONAL WEATHER SERVICE CHEYENNE WY
957 AM MDT THU SEP 9 2010

FORECAST IS BASED ON REQUEST TIME OF 0912 MDT ON SEPTEMBER 09.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
A MOSTLY DRY WILL DAY OCCUR AT THE BURN SITE TODAY WITH RELATIVE
HUMIDITIES DROPPING TO THE LOW TO MID 20S BY THE LATE AFTERNOON.
WINDS WILL BECOME SOUTHWEST BY THE EARLY AFTERNOON WITH GUSTS UP
TO 35 MPH IN OPEN AREAS AND OCCASIONAL GUSTS IN THE TEENS IN
SHELTERED AREAS. A COLD FRONT WILL MOVE ACROSS THE BURN SITE
LATE THIS EVENING WITH WINDS SHIFTING TO THE WEST AND EASING
OVERNIGHT. FRIDAY WILL BE COOLER WITH RELATIVE HUMIDITIES
MAINTAINING IN THE UPPER 30S. WINDS WILL BE OUT OF THE NORTHWEST
AND WILL BE GUSTY THROUGH LATE AFTERNOON.

.TODAY...

SKY/WEATHER.........PARTLY CLOUDY (40-50 PERCENT).
MAX TEMPERATURE.....62 TO 64.
MIN HUMIDITY........22 TO 24 PERCENT.
WIND (20 FT)........UPSLOPE/UPVALLEY 5 TO 9 MPH BECOMING SOUTHWEST
                    13 TO 17 MPH AFTER NOON. GUSTS 27 TO 32 MPH IN
                    OPEN AREAS WITH 15 TO 17 MPH IN SHELTERED AREAS.
CWR.................10 PERCENT.
LAL.................1.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......3000 FT AGL INCREASING TO 7500 FT AGL IN THE
                    AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST AROUND 28 MPH.
SMOKE DISPERSAL.....GOOD TO EXCELLENT (47400-225500 KNOT-FT).

.TONIGHT...

SKY/WEATHER.........PARTLY CLOUDY (45-55 PERCENT).
MIN TEMPERATURE.....36 TO 38.
MAX HUMIDITY........64 TO 72 PERCENT.
WIND (20 FT)........WEST 8 TO 11 MPH BECOMING DOWNSLOPE/DOWNVALLEY
                    4 TO 7 MPH.
CWR.................10 PERCENT.
LAL.................1.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......4700 FT AGL DECREASING TO 800 FT AGL AFTER
                    MIDNIGHT.
TRANSPORT WINDS.....SOUTHWEST AROUND 20 MPH.
SMOKE DISPERSAL.....FAIR TO EXCELLENT (18300-132700 KNOT-FT).

.FRIDAY...

SKY/WEATHER.........PARTLY CLOUDY (35-45 PERCENT).
MAX TEMPERATURE.....AROUND 54.
MIN HUMIDITY........37 PERCENT.
WIND (20 FT)........WEST WINDS 9 TO 15 MPH. GUSTS 23 TO 25 MPH
                    IN OPEN AREAS WITH 12 TO 15 MPH IN SHELTERED
                    AREAS IN THE AFTERNOON.
CWR.................10 PERCENT.
LAL.................1.
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......3500 FT AGL INCREASING TO 9200 FT AGL IN THE
                    AFTERNOON.
TRANSPORT WINDS.....WEST AROUND 30 MPH.
SMOKE DISPERSAL.....EXCELLENT TO EXCELLENT (116000-266000 KNOT-FT).

$$
FORECASTER...MAZUR
REQUESTED BY...ILLINOIS FEMO
TYPE OF REQUEST...WILDFIRE
.TAG 20100909.ILLIN.01/CYS