FNUS75 KSLC 130246
FWSSLC

SPOT FORECAST FOR BIG POLE
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
846 PM MDT WED AUG 12 2009

.DISCUSSION...HIGH PRESSURE SITUATED NEAR THE FOUR CORNERS
REGION WILL SLOWLY MIGRATE SOUTHWARD AND WEAKEN TONIGHT
THROUGH THURSDAY. HIGH BASED MOISTURE SPREADING NORTH ON THE
BACK SIDE OF THIS HIGH IS EXPECTED TO INCREASE ACROSS
NORTHERN UTAH ON THURSDAY...AND SHOULD BE SUFFICIENT FOR A
CHANCE OF AFTERNOON SHOWERS AND THUNDERSTORMS. ALTHOUGH
THESE STORMS WILL LIKELY REMAIN HIGH BASED...WETTING RAINS
WILL BE POSSIBLE ON THE HIGHER ELEVATIONS OF THE BURN AREA.
OTHERWISE SOUTHWEST WINDS ALOFT WILL BEGIN TO INCREASE
THURSDAY AFTERNOON...HOWEVER MUCH OF THE BURN AREA SHOULD
REMAIN SHELTERED FROM THIS FLOW WITH WINDS PRIMARILY DRIVEN
BY SLOPE FLOWS...WITH THE EXCEPTION OF GUSTY ERRATIC WINDS
NEAR THUNDERSTORMS.

BY FRIDAY A PACIFIC STORM SYSTEM IS EXPECTED TO SPREAD INTO
THE NORTHERN ROCKIES...WITH THE ASSOCIATED COLD FRONT
REACHING THE BURN AREA FRIDAY EVENING. AHEAD OF THIS FRONT
SOUTH TO SOUTHWEST WINDS ARE EXPECTED TO INCREASE FRIDAY
AFTERNOON...WITH GUSTS IN EXCESS OF 30 MPH ACROSS EXPOSED
AREAS POSSIBLE FRIDAY AFTERNOON. MUCH COOLER AIR WILL FILTER
INTO THE AREA BEHIND THIS FRONT FOR THE UPCOMING WEEKEND.

.TONIGHT...
  LAL.................1.
  HAINES INDEX........6 ..HIGH.
  SKY/WEATHER.........PARTLY CLOUDY (30-40 PERCENT CLOUD COVER)
                      UNTIL 2400...THEN MOSTLY CLEAR (15-25
                      PERCENT CLOUD COVER).
  MIN TEMPERATURE.....61-64.
  MAX HUMIDITY........27-30 PERCENT.
  WINDS - 20-FOOT.....DOWNVALLEY/DOWNSLOPE 4-9 MPH. UPPER
                      RIDGELINE WINDS SOUTHWEST 6-12 MPH.

.THURSDAY...
  LAL.................1 UNTIL NOON...THEN 3.
  HAINES INDEX........6 ..HIGH.
  CLEARING INDEX......1000+.
  SKY/WEATHER.........MOSTLY SUNNY (15-25 PERCENT CLOUD COVER)
                      UNTIL 1200...THEN PARTLY CLOUDY (45-55
                      PERCENT CLOUD COVER). A CHANCE OF SHOWERS
                      AND THUNDERSTORMS AFTER NOON.
  MAX TEMPERATURE.....82-85.
  MIN HUMIDITY........11-14 PERCENT.
  WINDS - 20-FOOT.....WEST/DOWNSLOPE 2-5 MPH BECOMING
                      EAST/UPSLOPE 5-10 MPH. UPPER RIDGELINE
                      WINDS SOUTHWEST 12-20 MPH

.OUTLOOK FOR FRIDAY...
  LAL.................1 UNTIL NOON...THEN 3.
  HAINES INDEX........6 ..HIGH.
  CLEARING INDEX......1000+.
  SKY/WEATHER.........PARTLY CLOUDY (55-65 PERCENT CLOUD COVER). A
                      SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS IN
                      THE AFTERNOON.
  MAX TEMPERATURE.....80.
  MIN HUMIDITY........19-21 PERCENT.
  WINDS - 20-FOOT.....WEST/DOWNSLOPE 2-5 MPH BECOMING EAST/UPSLOPE
                      5-10 MPH AFTER 1100...THEN BECOMING SOUTH
                      15-25 MPH WITH HIGHER GUSTS AFTER 1400.
                      UPPER RIDGELINE WINDS SOUTHWEST 10-15 MPH
                      INCREASING TO 20-30 WITH GUSTS IN EXCESS OF
                      40 MPH IN THE AFTERNOON.



FORECASTER...SEAMAN
REQUESTED BY...GARY PECK
REASON FOR REQUEST...WILDFIRE
.TAG 20090812.BIGPO.01/SLC

$$