FNUS75 KSLC 052037
FWSSLC

SPOT FORECAST FOR TWITCHELL CANYON
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
237 PM MDT SUN SEP 5 2010

.DISCUSSION...THERE IS A RED FLAG WARNING TODAY UNTIL 9 PM
FOR YOUR FIRE ZONE BELOW 7000 FEET FOR STRONG WINDS AND LOW RH.
BASED ON THE FIRE ACTIVITY THAT OCCURRED YESTERDAY AND SEEING THE
SMOKE PLUME DEVELOPING ON SATELLITE YOU SHOULD CONSIDER YOURSELF
UNDER THE RED FLAG WARNING. FUELS HAD NOT BEEN CLASSIFIED AS NON-
CRITICAL AND THEREFORE YOU WERE NOT INITIALLY INCLUDED IN THIS RED
FLAG WARNING.

WINDS ARE PICKING UP AND WILL CONTINUE TO INCREASE THROUGH
THE AFTERNOON AND SHIFT GRADUALLY TO MORE WESTERLY. TIMING OF THE
COLD FRONT STILL REMAINS TO BE AROUND 9 PM AT ELEVATIONS ABOVE
9000 FEET. THE SURFACE FRONT ITSELF MOVING ACROSS VALLEY LOCATIONS
WILL LIKELY PASS BY AROUND 7 PM. STRONG WESTERLY WINDS ARE EXPECTED
THROUGH THIS EVENING UNTIL THAT FRONT ARRIVES THEN SHIFT TO THE
WEST NORTHWEST AND BE STRONG FOR AN HOUR OR TWO BEFORE RAPIDLY
DIMINISHING.

THIS WILL BE A DRY COLD FRONT.

COOLER AND STABLE MONDAY. WINDS PICKUP FROM THE SOUTHWEST ALREADY
ON TUESDAY AS ANOTHER TROUGH DEVELOPS OVER THE PACIFIC NORTHWEST.
SOME MOISTURE IS NOW EXPECTED TO GET TAPPED FOR A SLIGHT CHANCE OF
THUNDERSTORMS TUESDAY AFTERNOON INTO WEDNESDAY. THESE STORMS WILL
MOST LIKELY BE DRY THUNDERSTORMS. STRONG SOUTHWEST WINDS AND DRY
CONDITIONS ARE FORECAST FOR WEDNESDAY AFTERNOON...SIMILAR TO TODAY
BUT MORE SLIGHTLY MORE SOUTHERLY AND RHS IN THE MID TEENS.

AFTER THIS TROUGH PASS THE FLOW BECOMES A LITTLE MORE WESTERLY.
TEMPERATURES WILL BE DOWN ABOUT 10 DEGREES ON THURSDAY AND RHS UP
BY 5 TO 10 PERCENT. BY FRIDAY AND SATURDAY THE FLOW ALOFT STARTS
TO BECOME MORE SOUTHWEST AND TEMPERATURES AND WINDS WILL INCREASE
A LITTLE AND RHS DECREASE.

THE COMPUTER MODELS DIVERGE ON A SOLUTION FOR EARLY NEXT WEEK BUT
THERE IS A POSSIBILITY OF STRONG SOUTHWEST WINDS DEVELOPING FOR
MONDAY AND TUESDAY AHEAD OF ANOTHER TROUGH.

.REST OF TODAY...
  LAL.................1.
  HAINES INDEX........6 ..HIGH.
  CLEARING INDEX......1000+.
  SKY/WEATHER.........SUNNY (0-10 PERCENT CLOUD COVER).
  MAX TEMPERATURE.....80.
  MIN HUMIDITY........13-15 PERCENT.
  WINDS - 20-FOOT.....WINDY. WEST SOUTHWEST WINDS 20-30 MPH WITH
                      GUSTS TO AROUND 40 MPH AT 8000 FT AND AROUND
                      30 MPH WITH GUSTS TO 55 MPH ON THE RIDGE TOPS.

.TONIGHT...
  LAL.................1.
  HAINES INDEX........4 ..LOW.
  SKY/WEATHER.........MOSTLY CLEAR (5-15 PERCENT CLOUD COVER).
  MIN TEMPERATURE.....40-42.
  MAX HUMIDITY........55-57 PERCENT.
  WINDS - 20-FOOT.....WINDY. WEST WINDS 20-30 MPH WITH GUSTS TO
                      AROUND 40-45 MPH AT 8000 FT AND AROUND 30 MPH
                      WITH GUSTS TO 50 MPH ON RIDGE TOPS UNTIL ABOUT
                      9 PM. BEHIND THE COLD FRONT...WINDS WILL SHIFT
                      TO THE WEST NORTHWEST AND REMAIN RATHER STRONG
                      FOR AN HOUR OR TWO THEN DIMINISH TO 10-15 MPH
                      WITH GUSTS NEAR 20 MPH.

.OUTLOOK FOR MONDAY...
  LAL.................1.
  HAINES INDEX........5 ..MODERATE.
  CLEARING INDEX......240.
  SKY/WEATHER.........MOSTLY SUNNY (5-15 PERCENT CLOUD COVER).
  MAX TEMPERATURE.....65-67.
  MIN HUMIDITY........14-17 PERCENT.
  WINDS - 20-FOOT.....NORTH WINDS 5 MPH.



FORECASTER...STRUTHWOLF
REQUESTED BY...RUSS IVIE
REASON FOR REQUEST...WILDFIRE
.TAG 20100905.TWITC.01/SLC

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