FNUS75 KBYZ 212040
FWSBYZ

SPOT FORECAST FOR BLACK RX PROJECT...NORTHERN CHEYENNE
NATIONAL WEATHER SERVICE BILLINGS MT
240 PM MDT WED OCT 21 2009

FORECAST IS BASED ON IGNITION TIME OF 1100 MDT ON OCTOBER 21.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...

LOW CLOUDS WILL DISSIPATE LATE THIS AFTERNOON. RELATIVE
HUMIDITIES WILL BOTTOM OUT IN THE UPPER 40S THIS AFTERNOON.
TOMORROW MORNING SOUTH TO SOUTHEAST WINDS WILL DEVELOP AHEAD OF
AN AFTERNOON COLD FRONT. WINDS WILL SHIFT TO THE NORTHWEST IN THE
AFTERNOON. ISOLATED SHOWERS WILL ACCOMPANY THE FRONTAL PASSAGE IN
THE AFTERNOON. RELATIVE HUMIDITIES AHEAD OF THE FRONT WILL DROP
INTO THE MID 30S. MIXING HEIGHTS SHOULD BE AROUND 6000 FEET EARLY
THURSDAY AFTERNOON...FALLING ONCE THE FRONT MOVES THROUGH.
CHAMBERS

.TODAY...

SKY/WEATHER.........DECREASING CLOUDS.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MAX TEMPERATURE.....47-52.
MIN HUMIDITY........45-50 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......SOUTHEAST WINDS 5 TO 10 MPH.
 RIDGETOP...........WEST 5 TO 10 MPH.
MIXING HEIGHT.......3500 FT AGL.
MIXING WINDS........SOUTHWEST 5 TO 10 MPH.

.TONIGHT...

SKY/WEATHER.........PARTLY CLOUDY.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MIN TEMPERATURE.....27-32.
MAX HUMIDITY........73-78 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......SOUTHEAST WINDS 5 TO 10 MPH.
 RIDGETOP...........SOUTHEAST 5 TO 10 MPH.
MIXING HEIGHT.......300 FT AGL.
MIXING WINDS........SOUTHWEST 5 TO 12 MPH.

.THURSDAY...

SKY/WEATHER.........MOSTLY CLOUDY. ISOLATED SHOWERS IN THE AFTERNOON.
CWR.................10 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MAX TEMPERATURE.....53-56.
MIN HUMIDITY........37-42 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......SOUTHEAST WINDS 5 TO 10 MPH IN THE MORNING SHIFTING
                    TO THE NORTHWEST IN THE LATE AFTERNOON.
 RIDGETOP...........SOUTH 10 TO 15 MPH IN THE MORNING...BECOMING NORTHWEST
                    15 TO 25 MPH IN THE LATE AFTERNOON.
MIXING HEIGHT.......6000 FT AGL.
MIXING WINDS........WEST 10 TO 20 MPH.

$$
FORECASTER...CHAMBERS
REQUESTED BY...LEE OLD BEAR
TYPE OF REQUEST...PRESCRIBED
.TAG 20091021.BLACK.01/BYZ