FNUS75 KSLC 111337
FWSSLC

SPOT FORECAST FOR TWITCHELL CANYON
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
737 AM MDT WED AUG 11 2010

.DISCUSSION...TROUGH AXIS THAT WAS ALONG THE WEST COAST YESTERDAY
HAS MOVED INLAND TO A EASTERN OREGON-WESTERN NEVADA POSITION THIS
MORNING. STRONG SOUTH SOUTHWEST WINDS ALOFT HAS BROUGHT VERY DRY
AIR INTO EXTREME WESTERN UTAH BUT MOISTURE HAS ALSO BEEN BROUGHT
NORTHWARD INTO SOUTH CENTRAL UTAH AS WELL. THE BATTLE GROUND OF
THESE TWO AIR MASSES WILL BE JUST TO YOUR EAST THROUGHOUT TODAY.
THEREFORE ANY CONVECTION THAT TRIES TO DEVELOP SHOULD REMAIN OVER
THE MOUNTAINS TO YOUR EAST AND MOVE NORTHEAST AWAY FROM YOUR FIRE.

DUE TO THE STRONG WINDS ALOFT TODAY EXPECT WINDY CONDITIONS WITH
LOW RELATIVE HUMIDITIES. ONCE AGAIN A RED FLAG WARNING IS IN
EFFECT JUST TO YOUR WEST FROM I-15 WESTWARD FOR LOW RH AND STRONG
SOUTH WINDS OVER 30 MPH.

AS THE TROUGH AXIS MOVES EAST ACROSS THE STATE THURSDAY WINDS WILL
SHIFT TO THE WEST BY THURSDAY NIGHT AND THEN BECOME LIGHT AND
VARIABLE THROUGH THE WEEKEND. A DRY NORTHWEST FLOW WILL PREVAIL
EARLY NEXT WEEK.

.TODAY...
LAL...................1 UNTIL NOON...THEN 2.
HAINES INDEX..........4 ..LOW.
CLEARING INDEX........1000+.
SKY/WEATHER...........MOSTLY SUNNY (10-20 PERCENT CLOUD COVER)
                      UNTIL NOON...THEN PARTLY CLOUDY (45-55
                      PERCENT CLOUD COVER). A SLIGHT CHANCE OF
                      SHOWERS AND THUNDERSTORMS AFTER NOON.
MAX TEMPERATURE.......80.
MIN HUMIDITY..........20-22 PERCENT.
WIND (20 FT)..........WINDY. SOUTH SOUTHEAST WINDS 5-10 MPH
                      INCREASING TO 10-15 MPH THIS AFTERNOON WITH
                      GUSTS TO 30 MPH.

.TONIGHT...
LAL...................2 UNTIL MIDNIGHT...THEN 1.
HAINES INDEX..........5 ..MODERATE.
SKY/WEATHER...........MOSTLY CLEAR (25-35 PERCENT CLOUD COVER). A
                      SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS
                      UNTIL MIDNIGHT.
MIN TEMPERATURE.......53-55.
MAX HUMIDITY..........32-36 PERCENT.
WIND (20 FT)..........WINDY. SOUTHWEST WINDS 10-15 MPH WITH GUSTS
                      TO 30 MPH THROUGH 1000 PM. DECREASING TO
                      5-10 MPH IN THE LATE EVENING AND OVERNIGHT.

.OUTLOOK FOR THURSDAY...
LAL...................1.
HAINES INDEX..........5 ..MODERATE.
CLEARING INDEX........1000+.
SKY/WEATHER...........MOSTLY SUNNY (10-20 PERCENT CLOUD COVER) THEN
                      BECOMING PARTLY CLOUDY (35-45 PERCENT CLOUD
                      COVER).
MAX TEMPERATURE.......80.
MIN HUMIDITY..........13-15 PERCENT.
WIND (20 FT)..........SOUTHWEST WINDS 10 TO 15 MPH.



FORECASTER...STRUTHWOLF
REQUESTED BY...CLAY MATHESON
REASON FOR REQUEST...WILDFIRE
.TAG 20100811.TWITC.01/SLC

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