FNUS75 KCYS 062047
FWSCYS

SPOT FORECAST FOR IRON MOUNTAIN RX...BLM
NATIONAL WEATHER SERVICE CHEYENNE WY
147 PM MST TUE NOV 6 2012

FORECAST IS BASED ON IGNITION TIME OF 1426 MST ON NOVEMBER 06.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...NEAR CRITICAL FIRE WEATHER CONDITIONS WILL OCCUR
FROM LATE MORNING WEDNESDAY THROUGH THE AFTERNOON WEDNESDAY DUE
TO WEST WINDS OF 15 TO 30 MPH WITH GUSTS TO 35 MPH ALONG
WITH RELATIVE HUMIDITIES AS LOW AS 10 PERCENT WEDNESDAY AFTERNOON.

A RIDGE ALOFT WILL MOVE ACROSS THE BURN AREA TONIGHT...INDUCING
SURFACE LEE TROUGHING TO STRENGTHEN ACROSS EASTERN WYOMING...
PRODUCING INCREASING WEST WINDS OVER THE BURN AREA LATE TONIGHT.
ON WEDNESDAY...THE FLOW ALOFT WILL BE FROM THE WEST TO EAST WITH
CRITICAL OR NEAR CRITICAL FIRE WEATHER CONDITIONS OVER THE BURN
AREA...WITH RELATIVE HUMIDITIES AS LOW AS 10 PERCENT AND WINDS
GUSTING NEAR 35 MPH FROM THE WEST IN THE AFTERNOON. DRY WEATHER
WILL PREVAIL THROUGH WEDNESDAY.

ON THURSDAY...A WEAK BACKDOOR COLD FRONT WILL SLIDE WESTWARD TO
THE LEE OF THE LARAMIE RANGE AND THE BURN AREA...PRODUCING
COOLER TEMPERATURES AND UPSLOPE SOUTH AND SOUTHEAST WINDS. IT
WILL STILL BE DRY ON THURSDAY. LOWEST AFTERNOON HUMIDITIES WILL
BE AROUND 23 PERCENT.

ON FRIDAY...SOUTHWEST FLOW ALOFT WILL STRENGTHEN ACROSS THE BURN
AREA WITH SURFACE LOW PRESSURE DEVELOPING AND STRENGTHENING OVER
SOUTHEAST WYOMING. IT WILL STILL BE DRY OVER THE BURN AREA...BUT
WITH BREEZY SOUTH WINDS GUSTING UP TO 35 MPH. LOWEST AFTERNOON
HUMIDITIES WILL BE AROUND 30 PERCENT.

.TODAY...

SKY/WEATHER.........SUNNY (0-10 PERCENT).
MAX TEMPERATURE.....AROUND 64.
MIN HUMIDITY........27 PERCENT.
WIND (20 FT)........WEST WINDS 10 TO 17 MPH. GUSTS UP TO 25 MPH
                    INCREASING TO 35 MPH IN THE AFTERNOON.
CWR.................0 PERCENT.
LAL.................1.
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......3600-5100 FT AGL.
TRANSPORT WINDS.....WEST AROUND 19 MPH.
SMOKE DISPERSAL.....GOOD TO EXCELLENT (38800-101300 KNOT-FT).

.TONIGHT...

SKY/WEATHER.........CLEAR (5-15 PERCENT).
MIN TEMPERATURE.....AROUND 38.
MAX HUMIDITY........55 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 9 TO 12 MPH. GUSTS UP TO 25 MPH
                    DECREASING TO 20 MPH IN THE LATE EVENING AND
                    OVERNIGHT.
CWR.................0 PERCENT.
LAL.................1.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......2700 FT AGL DECREASING TO 200 FT AGL AFTER
                    MIDNIGHT.
TRANSPORT WINDS.....SOUTHWEST AROUND 15 MPH.
SMOKE DISPERSAL.....POOR TO GOOD (1900-39900 KNOT-FT).

.WEDNESDAY...

SKY/WEATHER.........MOSTLY SUNNY (10-20 PERCENT).
MAX TEMPERATURE.....AROUND 70.
MIN HUMIDITY........8 PERCENT.
WIND (20 FT)........BREEZY. SOUTHWEST WINDS 11 TO 20 MPH WITH GUSTS
                    TO AROUND 40 MPH SHIFTING TO THE WEST 20 TO 26
                    MPH WITH GUSTS TO AROUND 40 MPH IN THE
                    AFTERNOON.
CWR.................0 PERCENT.
LAL.................1.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......2100 FT AGL INCREASING TO 4200 FT AGL IN THE
                    AFTERNOON.
TRANSPORT WINDS.....WEST AROUND 26 MPH.
SMOKE DISPERSAL.....FAIR TO EXCELLENT (29200-125700 KNOT-FT).

$$
FORECASTER...RUBIN
REQUESTED BY...CHRIS OTTO
TYPE OF REQUEST...PRESCRIBED
.TAG 20121106.IRONM.01/CYS