FNUS75 KCYS 071529
FWSCYS

SPOT FORECAST FOR MARKING PEN RX...BLM
NATIONAL WEATHER SERVICE CHEYENNE WY
929 AM MDT SAT MAY 7 2011

FORECAST IS BASED ON IGNITION TIME OF 0915 MDT ON MAY 07.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
20FT SOUTHWEST WINDS WILL CONTINUE TO INCREASE TO SPEEDS OF 20 TO
30 MPH ACROSS THIS AREA THIS AFTERNOON. THIS WILL ALSO ALLOW
MIXING HEIGHTS TO INCREASE QUICKLY THIS AFTERNOON WITH RELATIVE
HUMIDITIES DROPPING TO 20 TO 25 PERCENT. MIXING HEIGHTS WILL
CONTINUE TO RISE QUICKLY THIS MORNING WITH HEIGHTS RISING TO ABOVE
9000FT BY EARLY AFTERNOON. ANY SHOWER THAT DOES DEVELOP TODAY WILL
MOST LIKELY NOT PRODUCE MUCH MORE THAN VIRGA.

.REST OF TODAY...

SKY/WEATHER.........PARTLY CLOUDY (50-60 PERCENT) THEN BECOMING
                    MOSTLY CLOUDY (65-75 PERCENT). SLIGHT CHANCE OF
                    RAIN SHOWERS IN THE AFTERNOON.
MAX TEMPERATURE.....AROUND 63.
MIN HUMIDITY........26 PERCENT.
WIND (20 FT)........WEST WINDS 17 TO 18 MPH WITH GUSTS TO AROUND 45
                    MPH.
CWR.................10 PERCENT INCREASING TO 20 PERCENT IN THE
                    AFTERNOON.
LAL.................2.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......6800 FT AGL INCREASING TO 9600 FT AGL IN THE
                    AFTERNOON.
TRANSPORT WINDS.....WEST AROUND 34 MPH.
SMOKE DISPERSAL.....EXCELLENT TO EXCELLENT (130800-240400 KNOT-FT).

.TONIGHT...

SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT) THEN BECOMING
                    PARTLY CLOUDY (55-65 PERCENT). ISOLATED
                    THUNDERSTORMS IN THE EVENING.
MIN TEMPERATURE.....AROUND 42.
MAX HUMIDITY........59-65 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 8 TO 17 MPH WITH GUSTS TO
                    AROUND 35 MPH IN THE EVENING BECOMING
                    DOWNSLOPE/DOWNVALLEY 4-7 MPH...THEN BECOMING
                    SOUTHWEST 8 TO 10 MPH EARLY IN THE MORNING.
CWR.................20 PERCENT DECREASING TO 10 PERCENT AFTER
                    MIDNIGHT.
LAL.................2.
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......4800 FT AGL DECREASING TO 200 FT AGL AFTER
                    MIDNIGHT.
TRANSPORT WINDS.....EAST AROUND 8 MPH.
SMOKE DISPERSAL.....POOR TO EXCELLENT (3400-112200 KNOT-FT).

.SUNDAY...

SKY/WEATHER.........MOSTLY CLOUDY (60-70 PERCENT). CHANCE OF RAIN
                    SHOWERS IN THE AFTERNOON.
MAX TEMPERATURE.....AROUND 61.
MIN HUMIDITY........24 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 11 TO 19 MPH. GUSTS UP TO 30
                    MPH INCREASING TO 35 MPH IN THE AFTERNOON.
CWR.................30 PERCENT.
LAL.................2.
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME
                    DOMINATED FIRE GROWTH.
MIXING HEIGHT.......5800 FT AGL INCREASING TO 11200 FT AGL IN THE
                    AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST AROUND 24 MPH.
SMOKE DISPERSAL.....EXCELLENT TO EXCELLENT (72300-237800 KNOT-FT).

$$
FORECASTER...COX
REQUESTED BY...KIRK STROM
TYPE OF REQUEST...PRESCRIBED
.TAG 20110507.MARKI.01/CYS