FNUS75 KBYZ 192330
FWSBYZ

SPOT FORECAST FOR GILEAD...USFS
NATIONAL WEATHER SERVICE BILLINGS MT
530 PM MDT WED SEP 19 2012

FORECAST IS BASED ON REQUEST TIME OF 1711 MDT ON SEPTEMBER 19.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.

.DISCUSSION...

NO CHANGES TO THE 250 PM SPOT. INCLUDED HAINES INDEX WHICH WILL
BE A 4 FOR THE NEXT FEW DAYS. NORTHWESTERLY FLOW ALOFT TO PERSIST
THROUGH THE END OF THE WEEK BUT IMPACT MAINLY RIDGETOP ELEVATIONS
WITH SLOPE DOMINANT WINDS EXPECTED ON THE FIRE EACH DAY. A
SERIES OF WEAK AND DRY COLD FRONTS WILL MOVE THROUGH THE AREA
THURSDAY AND FRIDAY WITH LITTLE IMPACT ON WINDS BUT SHOULD KEEP
TEMPERATURES SEASONALLY COOL AND HOLD RH VALUES IN THE 20S.

LOOKING LATER IN THE FORECAST THERMAL BELTS WILL BECOME MORE
NOTICEABLE FRIDAY AND SATURDAY NIGHTS. SATURDAY AND SUNDAY WILL
BE WARM AND DRY WITH SLOPE DOMINANT WINDS. ISOLATED SHOWERS ARE
POSSIBLE BY MONDAY BUT MOISTURE WILL BE LIMITED. CHAMBERS

.TONIGHT...

SKY/WEATHER.........MOSTLY CLEAR.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MIN TEMPERATURE.....39-44.
MAX HUMIDITY........43-48 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......DOWNSLOPE/DOWNVALLEY 5 TO 10 MPH.
 RIDGETOP...........NORTHWEST 15 TO 30 MPH.
MIXING HEIGHT.......1300 FT AGL.
MIXING WINDS........WEST 5 TO 15 MPH.

THURSDAY...

SKY/WEATHER.........SUNNY.
CWR.................0 PERCENT.
LAL.................1...NO THUNDERSTORMS.
MAX TEMPERATURE.....61-66.
MIN HUMIDITY........22-27 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......UPSLOPE/UPVALLEY 9 TO 15 MPH.
 RIDGETOP...........NORTHWEST 20 TO 30 MPH.
MIXING HEIGHT.......5800 FT AGL.
MIXING WINDS........NORTHWEST 25 TO 35 MPH.
HAINES INDEX........4.

.THURSDAY NIGHT...

SKY/WEATHER.........MOSTLY CLEAR.
CWR.................ZERO.
LAL.................1...NONE.
MIN TEMPERATURE.....36-41.
MAX HUMIDITY........56-61 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......DOWNSLOPE/DOWN VALLEY 5 TO 8 MPH.
 RIDGETOP...........NORTHWEST 15 TO 20 MPH.
MIXING HEIGHT.......1000 FEET AGL.
MIXING WINDS........NORTHWEST 20 MPH.
HAINES INDEX........4.

.FRIDAY...

SKY/WEATHER.........SUNNY.
CWR.................ZERO.
LAL.................1...NONE.
MAX TEMPERATURE.....58-63.
MIN HUMIDITY........22-27 PERCENT.
WIND (20 FT)........
 SLOPE/VALLEY.......UPSLOPE/UPVALLEY 8 TO 12 MPH.
 RIDGETOP...........NORTHWEST 15 MPH
MIXING HEIGHT.......5600 FEET AGL.
MIXING WINDS........NORTHWEST 20 MPH
HAINES INDEX........4.

.OUTLOOK FOR SATURDAY...
SUNNY. TEMPERATURES 60 TO 65. HUMIDITY 19-24 PERCENT. WINDS
UPSLOPE AND UPVALLEY 10 TO 15 MPH. RIDGETOP WINDS NORTH 10 MPH.

.OUTLOOK FOR SUNDAY...
MOSTLY SUNNY. TEMPERATURES 63 TO 68. HUMIDITY 17-22 PERCENT. WINDS
UPSLOPE AND UPVALLEY 10 TO 15 MPH. RIDGETOP WINDS WEST 10 MPH.

$$
FORECASTER...CHAMBERS
REQUESTED BY...KEVIN HILLARD
TYPE OF REQUEST...WILDFIRE
.TAG 20120919.GILEA.03/BYZ