FNUS75 KCYS 222050
FWSCYS

SPOT FORECAST FOR MARKING PEN RX...BLM
NATIONAL WEATHER SERVICE CHEYENNE WY
250 PM MDT THU SEP 22 2011

FORECAST IS BASED ON IGNITION TIME OF 1400 MDT ON SEPTEMBER 23.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
WARM...DRY AND GUSTY CONDITIONS WILL CONTINUE OVER THE BURN SITE
THROUGH SUNSET. THE COMBINATION WILL CREATE NEAR RED FLAG
CONDITIONS OVER THE BURN SITE THROUGH THAT TIME.

OTHERWISE...HIGH PRESSURE IN THE UPPER ATMOSPHERE WILL BUILD OVER
THE ROCKIES TONIGHT AND PERSIST THROUGH SUNDAY. THE RESULT WILL
BE CONTINUED WARM AND DRY CONDITIONS OVER THE BURN SITE THROUGH
THAT TIME. MINIMUM RELATIVE HUMIDITY VALUES EACH DAY WILL BE
BETWEEN 10 AND 15 PERCENT. HOWEVER...WESTERLY SURFACE WINDS WILL
NOT BE AS GREAT AS THOSE OF TODAY WITH GUSTS IN THE DAYTIME HOURS
BETWEEN 15 AND 20 MPH. THE NEXT CHANGE IN THE WEATHER WILL COMR
ON MONDAY AS A COLD FRONT MOVES ACROSS THE BURN SITE. THE FRONT
WILL BRING AN INCREASE IN WIND SPEEDS.

.TONIGHT...

SKY/WEATHER.........CLEAR (5-15 PERCENT).
MIN TEMPERATURE.....AROUND 44.
MAX HUMIDITY........AROUND 50 PERCENT.
WIND (20 FT)........NORTHWEST WINDS 8 TO 11 MPH EARLY IN THE
                    EVENING WITH GUSTS TO 17 MPH. BECOMING
                    DOWNSLOPE/DOWNVALLEY 4-7 MPH.
CWR.................0 PERCENT.
LAL.................1.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......2400 FT AGL DECREASING TO 200 FT AGL BY
                    MIDNIGHT.
TRANSPORT WINDS.....WEST AROUND 10 MPH.
SMOKE DISPERSAL.....GOOD BECOMING POOR (800-34800 KNOT-FT).

.FRIDAY...

SKY/WEATHER.........MOSTLY SUNNY (20-30 PERCENT).
MAX TEMPERATURE.....75 TO 79 AT MID SLOPE AND RIDGETOP AND AROUND 75
                    IN VALLEY.
MIN HUMIDITY........13 PERCENT.
WIND (20 FT)........BECOMING WEST 7 TO 10 MPH BY LATE MORNING WITH
                    GUSTS TO 16 MPH.
CWR.................0 PERCENT.
LAL.................1.
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
                    FIRE GROWTH.
MIXING HEIGHT.......INCREASING TO 8000 FT AGL IN THE AFTERNOON.                  AFTERNOON.
TRANSPORT WINDS.....WEST AROUND 11 MPH.
SMOKE DISPERSAL.....POOR BECOMING EXCELLENT (20600-91800 KNOT-FT).

$$
FORECASTER...WEILAND
REQUESTED BY...HANS PEDERSEN
TYPE OF REQUEST...PRESCRIBED
.TAG 20110923.MARKI.01/CYS