FNUS75 KCYS 082026
FWSCYS

SPOT FORECAST FOR LIBBY...BLM CAD
NATIONAL WEATHER SERVICE CHEYENNE WY
226 PM MDT WED AUG 8 2012

FORECAST IS BASED ON REQUEST TIME OF 1401 MDT ON AUGUST 08.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
A QUIET NIGHT AT THE FIRE SITE WITH PARTLY CLOUDY SKIES THIS
EVENING QUICKLY GIVING WAY TO CLEARING OVERNIGHT. TEMPERATURES
WILL FALL INTO THE 40S WITH HUMIDITY RECOVERIES AROUND 50 PERCENT.
WINDS WILL BE A BIT MORE SWIRLY ESPECIALLY THROUGH THE EVENING
HOURS. NORTHWEST WINDS CURRENTLY SHOULD TURN MORE EASTERLY THROUGH
EARLY EVENING AND EVENTUALLY SOUTH OR SOUTHEAST BY MID TO LATE
EVENING. THIS DIRECTION WOULD COUNTERACT THE TYPICAL
DOWNSLOPE/DOWNVALLEY DIRECTION OF W/NW. BY AROUND MIDNIGHT WINDS
SHOULD LESSEN...A TREND THAT SHOULD CONTINUE AS WINDS TURN MORE
DOWNSLOPE/DOWNVALLEY THROUGH SUNRISE. LIGHT AND VARIABLE WINDS ARE
ONCE AGAIN EXPECTED ON THURSDAY MORNING...BECOMING
UPSLOPE/UPVALLEY AFTER 1000. MORE MOISTURE WILL COMBINE WITH A
WEAK WEATHER SYSTEM TO PRODUCE MORE CLOUDS AND A CHANCE OF
AFTERNOON SHOWERS AND THUNDERSTORMS ON THURSDAY.

.TONIGHT...

SKY/WEATHER.........PARTLY CLOUDY (15-30 PERCENT) UNTIL 2000...THEN
                    BECOMING CLEAR (0-10 PERCENT).
MIN TEMPERATURE.....45 TO 48 DEGREES.
MAX HUMIDITY........45 TO 55 PERCENT.
WIND (20 FT)........NORTHWEST AT AROUND 5 MPH UNTIL 2100...THEN
                    BECOMING SOUTH/SOUTHEAST AT 10 TO 15 MPH WITH
                    GUSTS UP TO 25 MPH. AFTER 0300 BECOMING
                    DOWNVALLEY 5 TO 15 MPH.
CWR.................0 PERCENT.
LAL.................1.
HAINES INDEX........6 OR HIGH POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......6300 FT AGL DECREASING TO 500 FT AGL AFTER
                    MIDNIGHT.
TRANSPORT WINDS.....SOUTH/SOUTHEAST AROUND 10 TO 15 MPH.
SMOKE DISPERSAL.....EXCELLENT BECOMING POOR AFTER MIDNIGHT
                    (5500-82000 KNOT-FT).

.THURSDAY...

SKY/WEATHER.........MOSTLY CLEAR (0-10 PERCENT) UNTIL 1000...THEN
                    BECOMING PARTLY CLOUDY (30-40 PERCENT) UNTIL
                    1500...THEN BECOMING MOSTLY CLOUDY
                    (60-70 PERCENT). CHANCE OF SHOWERS AND
                    THUNDERSTORMS AFTER 1200.
MAX TEMPERATURE.....65 TO 69.
MIN HUMIDITY........20 TO 25 PERCENT.
WIND (20 FT)........LIGHT AND VARIABLE AT AROUND 5 MPH UNTIL 1000...
                    THEN BECOMING UPSLOPE/UPVALLEY AT 5 TO 10 MPH.
CWR.................0 PERCENT UNTIL 1200...THEN 20 PERCENT.
LAL.................3.
HAINES INDEX........6 OR HIGH POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......5200 FT AGL INCREASING TO 10200 FT AGL IN THE
                    AFTERNOON.
TRANSPORT WINDS.....NORTHWEST AT 5 TO 10 MPH.
SMOKE DISPERSAL.....GOOD BECOMING EXCELLENT (57400-122100 KNOT-FT).

$$
FORECASTER...HAHN
REQUESTED BY...CODY BECKER
TYPE OF REQUEST...WILDFIRE
.TAG 20120808.LIBBY.01/CYS