FNUS75 KSLC 260349
FWSSLC

SPOT FORECAST FOR TABBY2
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
949 PM MDT SUN JUL 25 2010

...FIRE WEATHER WATCH FROM NOON TO 10 PM MDT MONDAY...

.DISCUSSION...MID AND UPPER LEVEL MOISTURE WILL INCREASE RAPIDLY ON
MONDAY AS HIGH PRESSURE BEGINS TO SHIFT EAST. ANTICIPATE AN
INCREASED THREAT OF CONVECTION AND ISOLATED THUNDERSTORM
DEVELOPMENT OVER THE WEST DESERT OF NORTHWEST UTAH MID TO LATE
AFTERNOON AS A RESULT. GREATEST CONCERNS FROM THUNDERSTORM
DEVELOPMENT REVOLVES AROUND DRY LIGHTNING AND ERRATIC AND GUSTY
OUTFLOW WINDS DURING THAT TIME. A FIRE WEATHER WATCH IS IN EFFECT
AS A RESULT. IN THE NEAR TERM...UPPER LEVEL WINDS REMAIN LIGHT
AND SLOPE FLOWS AT TABBY2 ARE EXPECTED TO FOLLOW DIURNAL TRENDS
WITH LIGHT DOWNSLOPE EASTERLIES TONIGHT TRANSITIONING TO LIGHT
UPSLOPE SOUTHWESTERLIES BY MID MORNING MONDAY. DUE TO THE
PROXIMITY OF THE SITE TO THE GREAT SALT LAKE...PREVAILING WINDS
SHOULD TAKE MORE OF NORTHWESTERLY UPSLOPE COMPONENT AS THE LAKE
BREEZE DEVELOPS AND PUSHES SOUTH BETWEEN 1100 AND 1300. MOISTURE
WILL CONTINUE TO INCREASE THROUGH TUESDAY INCREASING THE
POTENTIAL FOR THUNDERSTORM ACTIVITY IN THE AFTERNOON. THAT
SAID... THE CHANCE OF WETTING RAINS EXPECTED TO REMAIN LOW
THROUGH THE FORECAST PERIOD.

.REST OF TONIGHT...
LAL...................1.
HAINES INDEX..........6 ..HIGH.
SKY/WEATHER...........PARTLY CLOUDY (35-45 PERCENT CLOUD COVER).
MIN TEMPERATURE.......70-72.
MAX HUMIDITY..........30-32 PERCENT.
WIND (20 FT)..........NORTH WINDS 5 MPH LATE IN THE EVENING
                      BECOMING DOWNSLOPE 4 TO 7 MPH BY MIDNIGHT.

.MONDAY...
LAL...................1 UNTIL NOON...THEN 2.
HAINES INDEX..........5 ..MODERATE.
CLEARING INDEX........590.
SKY/WEATHER...........PARTLY CLOUDY (50-60 PERCENT CLOUD COVER) IN
                      THE MORNING BECOMING MOSTLY CLOUD
                      (60-75 PERCENT CLOUD COVER).
                      ISOLATED DRY THUNDERSTORMS AFTER 1400.
MAX TEMPERATURE.......90.
MIN HUMIDITY..........17-19 PERCENT.
WIND (20 FT)..........DOWNSLOPE 4 TO 7 MPH BECOMING UPSLOPE
                      4 TO 7 MPH BY 1000. LAKE BREEZE PASSAGE
                      SHOULD TRANSITION WINDS TO NORTHWEST
                      5 TO 10 MPH AFTER 1200. THREAT WINDOW FOR
                      ERRATIC AND GUSTY WINDS DUE TO THUNDERSTORMS
                      HIGHEST AFTER 1400. GUSTY OUTFLOW TO 40 MPH
                      POSSIBLE WITH THESE THUNDERSTORMS.

.OUTLOOK FOR TUESDAY...
LAL...................2 UNTIL NOON...THEN 4.
HAINES INDEX..........3 ..VERY LOW.
CLEARING INDEX........1000+.
SKY/WEATHER...........PARTLY CLOUDY (50-60 PERCENT CLOUD COVER)
                      THEN BECOMING MOSTLY CLOUDY (70-80 PERCENT
                      CLOUD COVER). ISOLATED SHOWERS AND
                      THUNDERSTORMS IN THE MORNING...THEN SCATTERED
                      SHOWERS AND THUNDERSTORMS IN THE AFTERNOON.
MAX TEMPERATURE.......82-84.
MIN HUMIDITY..........29-31 PERCENT.
WIND (20 FT)..........DOWNSLOPE 4 TO 7 MPH THROUGH 1000...BECOMING
                      WEST 5 TO 12 MPH IN THE AFTERNOON.



FORECASTER...MERRILL
REQUESTED BY...CHRISTINE KING
REASON FOR REQUEST...WILDFIRE
.TAG 20100725.TABBY.01/SLC

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