FNUS75 KSLC 211348
FWSSLC

SPOT FORECAST FOR COOPER KNOLLS
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
748 AM MDT WED SEP 21 2011

.DISCUSSION...A STRONG AND RATHER WARM HIGH PRESSURE ALOFT WILL
REMAIN CENTERED ACROSS THE GREAT BASIN THROUGH FRIDAY. EXPECTING
A FEW CUMULUS BUILD UPS THIS AFTERNOON AND AGAIN THURSDAY AFTERNOON
WITH ISOLATED TERRAIN-BASED THUNDERSTORMS OVER OR NEAR THE SITE.
THUNDERSTORMS WILL BE ON THE DRY SIDE WITH GUSTY ERRATIC WINDS AND
LIGHTNING THE MAIN THREAT. AWAY FROM ANY STORMS THE WINDS WILL BE
TERRAIN DRIVEN. AFTERNOON HUMIDITIES WILL TREND DOWNWARD THROUGH
FRIDAY AND OVERNIGHT RECOVERIES WILL BE FAIR TO POOR. THE AIRMASS
WILL BECOME MORE STABLE THURSDAY AND FRIDAY WITH CLEARING INDICES
FALLING TO NEAR TO A LITTLE BELOW 500 THURSDAY AND FRIDAY.

.TODAY...
  LAL.................1 UNTIL 1400...THEN 2.
  HAINES INDEX........5 ..MODERATE.
  CLEARING INDEX......770.
  SKY/WEATHER.........MOSTLY SUNNY (5-15 PERCENT CLOUD COVER) UNTIL
                      NOON...THEN PARTLY CLOUDY (35-45 PERCENT
                      CLOUD COVER). A SLIGHT CHANCE OF
                      THUNDERSTORMS AFTER 1400.
  MAX TEMPERATURE.....66-69.
  MIN HUMIDITY........18-21 PERCENT.
  WINDS - 20-FOOT.....NORTH NORTHEAST WINDS 4 TO 8 MPH WITH GUSTS
                      TO 13 MPH AFTER 1300.

.TONIGHT...
  LAL.................2 UNTIL 1900...THEN 1.
  HAINES INDEX........5 ..MODERATE.
  SKY/WEATHER.........MOSTLY CLEAR (25-35 PERCENT CLOUD COVER). A
                      SLIGHT CHANCE OF THUNDERSTORMS UNTIL 1900.
  MIN TEMPERATURE.....51-53.
  MAX HUMIDITY........35-38 PERCENT.
  WINDS - 20-FOOT.....NORTHEAST WINDS 5 TO 10 MPH...BECOMING 3 TO 5
                      MPH AFTER 2100.

.OUTLOOK FOR THURSDAY...
  LAL.................1 UNTIL 1400...THEN 2.
  HAINES INDEX........4 ..LOW.
  CLEARING INDEX......540.
  SKY/WEATHER.........MOSTLY SUNNY (5-15 PERCENT CLOUD COVER) THEN
                      BECOMING PARTLY CLOUDY (35-45 PERCENT CLOUD
                      COVER). A SLIGHT CHANCE OF THUNDERSTORMS
                      AFTER 1400.
  MAX TEMPERATURE.....67-70.
  MIN HUMIDITY........17-20 PERCENT.
  WINDS - 20-FOOT.....NORTHEAST WINDS 5 MPH...BECOMING NORTH 5 TO 8
                      MPH AFTER 1000.




FORECASTER...CONGER
REQUESTED BY...Eric Eastep
REASON FOR REQUEST...PRESCRIBED
.TAG 20110921.COOPE.01/SLC

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