FNUS75 KBYZ 202332
FWSBYZ

SPOT FORECAST FOR HOSS...BIA, CROW AGENCY
NATIONAL WEATHER SERVICE BILLINGS MT
532 PM MDT SAT AUG 20 2011

FORECAST IS BASED ON REQUEST TIME OF 1631 MDT ON AUGUST 20.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

...NOTABLE CHANGE IN WIND...LOW HUMIDITIES AND CHANCE OF ERRATIC WINDS
FOR HOSS FIRE SITE...

HIGH PRESSURE WILL BUILD OVER THE REGION THROUGH THE WEEKEND INTO
THE EARLY PART OF THE WORK WEEK. AS A RESULT...WARMER
TEMPERATURES...LOWER RH READINGS AND A CHANCE OF WET AND DRY
THUNDERSTORMS MOVES INTO THE FORECASTS. THE LIGHT NORTHEAST WINDS
PREVAILING SATURDAY WILL TURN TO THE SOUTHWEST SUNDAY AND
INCREASE BY SUNDAY EVENING. WIDELY SCATTERED WET AND DRY
THUNDERSTORMS WILL DEVELOP BY EVENING...THUS INCREASING THE
CHANCE OF GUSTY ERRATIC WINDS NEAR THE FIRE SITE SUNDAY EVENING.

BOTTOM LINE...LOOK FOR LIGHT WINDS AND LOW HUMIDITIES THROUGH
MOST OF THE DAY SUNDAY. BY EARLY EVENING...A MIX OF DRY AND WET
WIDELY SCATTERED THUNDERSTORMS MAY DEVELOP AROUND THE FIRE SITE.
SOUTHWEST WINDS WILL INCREASE TO 15 TO 25 MPH AT RIDGE TOP WITH
ERRATIC WINDS POSSIBLE IN THE CANYON. I AM EXPECTING WINDS TO
DECREASE BUT REMAIN FROM THE SOUTHWEST BY 2 AM AND OVERNIGHT.
CONFIDENCE CONCERNING RH TRENDS LOW. RH READINGS MAY RISE
BRIEFLY AROUND THUNDERSTORMS...BUT WOULD NOT BE SURPRISED TO SEE
THEM DROP INTO THE 25 TO 30 PERCENT RANGE ONCE THE SHOWERS MOVE
BY IN THE EARLY MORNING HOURS...AND THEN RECOVER SOMEWHAT LATE
OVERNIGHT AS WINDS DECREASE.

RH READINGS MONDAY WILL BE DOWN INTO THE TEENS...AND ARE NOT
EXPECTED TO RECOVER VERY WELL MONDAY NIGHT REMAINING BELOW 35
PERCENT...AND POSSIBLY NO HIGHER THAN 25 TO 30 PERCENT. WINDS
MONDAY NIGHT IN THE CANYON SHOULD BE SOUTH TO SOUTHWEST WINDS 5
TO 10 MPH.


.TONIGHT...

SKY/WEATHER.........MOSTLY CLEAR.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MIN TEMPERATURE.....54-59.
MAX HUMIDITY........47-52 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......NORTHEAST WINDS 5 TO 10 MPH IN THE EVENING
                    SHIFTING TO THE SOUTH OVERNIGHT.
 RIDGETOP...........SOUTHWEST 5 TO 10 MPH.

.SUNDAY...

SKY/WEATHER.........SUNNY. ISOLATED SHOWERS AND THUNDERSTORMS IN
                    THE LATE AFTERNOON.
CWR.................6 PERCENT.
LAL.................2...1 TO 8 STRIKES/15 MIN/CELL.
MAX TEMPERATURE.....76-84.
MIN HUMIDITY........21-26 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......LIGHT WINDS TURNING SOUTHWEST WINDS 5 TO 10 MPH. GUSTY
                    AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS IN THE
                    AFTERNOON.
 RIDGETOP...........SOUTHWEST 5 TO 15 MPH.

.SUNDAY NIGHT...

SKY/WEATHER.........PARTLY CLOUDY WITH WIDELY SCATTERED DRY AND WET
                    THUNDERSTORMS.
CWR.................14 PERCENT.
LAL.................2...1 TO 8 STRIKES/15 MIN/CELL.
MIN TEMPERATURE.....63-68.
MAX HUMIDITY........42-47 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......SOUTHWEST WINDS 10 TO 20 MPH EARLY...DECREASING TO
                    5 TO 15 LATE. GUSTY AND ERRATIC WINDS EXPECTED NEAR
                    THUNDERSTORMS.
 RIDGETOP...........WEST TO SOUTHWEST 15 TO 25 MPH.

.MONDAY...

SKY/WEATHER.........MOSTLY SUNNY.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MAX TEMPERATURE.....85-90.
MIN HUMIDITY........16-20 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......WEST WINDS 5 TO 15 MPH.
 RIDGETOP...........WEST 10 TO 20 MPH.

$$
FORECASTER...TESAR
REQUESTED BY...BRYCE ROGERS
TYPE OF REQUEST...WILDFIRE
.TAG 20110820.HOSS_.02/BYZ