FNUS75 KBYZ 301813
FWSBYZ

SPOT FORECAST FOR CATHEDRAL PEAK...BILLINGS DISAPTCH
NATIONAL WEATHER SERVICE BILLINGS MT
1213 PM MDT FRI SEP 30 2011

FORECAST IS BASED ON REQUEST TIME OF 1146 MDT ON SEPTEMBER 30.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...

...CRITICAL FIRE WEATHER CONDITIONS POSSIBLE SATURDAY...

A STRONG RIDGE OF HIGH PRESSURE WILL BRING MAINLY WARM AND DRY
CONDITIONS TO THE FIRE SITE THROUGH MONDAY...WITH MINIMUM RH
VALUES IN MID TO UPPER TEENS THROUGH SATURDAY. UPSLOPE/UPVALLEY
WINDS OF 5 TO 10 MPH ARE EXPECTED AT THE FIRE SITE...GUSTING TO
15 MPH. WINDS WILL SWITCH SOUTHWEST...FAVORING RIDGE TOP WINDS
THIS AFTERNOON. THE WINDS AT RIDGETOP LEVEL AND IN HIGH ELEVATION
EXPOSED AREAS WILL BE FROM THE SOUTHWEST...GUSTING TO AROUND 25
MPH. WINDS AT THE FIRE SITE WILL TAPER OFF AGAIN
OVERNIGHT...FAVORING NORMAL DIURNAL PATTERNS...BUT PICK BACK UP
AGAIN SATURDAY. THERE IS A SLIGHT CHANCE FOR THUNDERSTORMS OVER
THE FIRE SITE SATURDAY EVENING AS A WEAK COLD FRONT SINKS INTO
THE AREA. TEMPERATURES WILL BE SLIGHTLY COOLER SUNDAY AND
MONDAY...BUT STILL WELL ABOVE NORMAL.

.TODAY...

SKY/WEATHER.........SUNNY.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MAX TEMPERATURE.....73-78.
MIN HUMIDITY........14-19 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......UPSLOPE/UPVALLEY WINDS 5 TO 15 MPH
                    BECOMING SOUTHWEST AND GUSTY.
 RIDGETOP...........SOUTHWEST 15 TO 25 MPH.

.TONIGHT...

SKY/WEATHER.........MOSTLY CLEAR.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MIN TEMPERATURE.....44-49.
MAX HUMIDITY........56-61 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......DOWNSLOPE/DOWNVALLEY WINDS 5 TO 15 MPH.
 RIDGETOP...........SOUTHWEST 15 TO 30 MPH.

.SATURDAY...

SKY/WEATHER.........MOSTLY SUNNY.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MAX TEMPERATURE.....73-78.
MIN HUMIDITY........15-20 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......SOUTHWEST WINDS 5 TO 15 MPH.
 RIDGETOP...........SOUTHWEST 15 TO 30 MPH.

$$
FORECASTER...GILSTAD/RICHMOND
REQUESTED BY...LARRY
TYPE OF REQUEST...WILDFIRE
.TAG 20110930.CATHE.01/BYZ