FNUS75 KBYZ 211714
FWSBYZ

SPOT FORECAST FOR MAIN BOULDER...USFS
NATIONAL WEATHER SERVICE BILLINGS MT
1114 AM MDT TUE APR 21 2009

FORECAST IS BASED ON IGNITION TIME OF 1200 MDT ON APRIL 22.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...
WEDNESDAY IS EXPECTED TO BE A RATHER WARM DAY WITH RH READINGS
DROPPING INTO THE UPPER TEENS AGAIN. LIGHT DRAINAGE WINDS FROM
THE SOUTH WILL LIKELY BE COMMON EARLY IN THE MORNING WITH
OCCASIONAL WEST WINDS. BY MIDDAY WINDS WILL TURN TO THE EAST AND
NORTHEAST...BUT OCCASIONAL WIND GUSTS FROM THE WEST ARE POSSIBLE.
THERE WILL BE A VERY SLIGHT CHANCE OF A SHOWER OR THUNDERSHOWER
IN THE AFTERNOON PRODUCING GUSTY WEST WINDS. THE CHANCE OF
SHOWERS WILL INCREASE WEDNESDAY NIGHT INTO THURSDAY. A COLD FRONT
IS EXPECTED TO MOVE THROUGH THE AREA EARLY THURSDAY AND TURN
WINDS NORTHEAST WITH COOLER TEMPS AND MUCH HIGHER RH READINGS
FOR THURSDAY AFTERNOON.


.WEDNESDAY...

CWR.................10 PERCENT.
MAX TEMPERATURE.....69-74.
MIN HUMIDITY........19-25 PERCENT.

.WEDNESDAY NIGHT...

CWR.................15 PERCENT.
MIN TEMPERATURE.....43-48.
MAX HUMIDITY........71-82 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......SOUTHWEST WINDS 5 TO 15 MPH. GUSTY AND ERRATIC
                    WINDS EXPECTED NEAR THUNDERSHOWERS.
 RIDGETOP...........SOUTHWEST 20 TO 35 MPH.

.THURSDAY...

SKY/WEATHER.........MOSTLY CLOUDY. SCATTERED RAIN SHOWERS IN THE
                    MORNING...THEN NUMEROUS SHOWERS AND A FEW
                    THUNDERSTORMS IN THE AFTERNOON.
CWR.................60 PERCENT.
MAX TEMPERATURE.....51-56.
MIN HUMIDITY........50-55 PERCENT.
WIND (20 FT)........
  SLOPE/VALLEY......VARIABLE WINDS 5 TO 15 MPH IN THE EARLY MORNING...
                    BECOMING MAINLY NORTHEAST WINDS 5 TO 15 MPH REST OF THE DAY.

 RIDGETOP...........SOUTHWEST 10 TO 25 MPH.
MIXING HEIGHT.......4400 FT.
MIXING WINDS........SOUTHWEST 10 TO 20 MPH EARLY...NORTHEAST 10 TO 15 LATE.

$$
FORECASTER...TESAR
REQUESTED BY...ASHLEY SITES
TYPE OF REQUEST...PRESCRIBED
.TAG 20090422.MAINB.01/BYZ