FNUS75 KSLC 091034
FWSSLC

SPOT FORECAST FOR HELLS HOLLOW
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
434 AM MDT TUE OCT 9 2012

.DISCUSSION...MIN TEMPS OVERNIGHT AT THE PORTABLE SITE HAVE BEEN
RUNNING ROUGHLY 10 DEGREES WARMER THAN LAST NIGHT...ROUGHLY 5 DEGREES
WARMER AT THE 8000 FT LEVEL PER NEIGHBORING SITES. THIS
SAID...THE LOW LEVEL INVERSION IS NOT AS STRONG AS YESTERDAY AND
EXPECT A SLIGHTLY EARLIER MIXING TREND TO DEVELOP THIS MORNING.
ALTHOUGH CLEARING WILL BE BELOW 500 THROUGH 09-1000...EXPECT A
RAPID BREAK OF THE INVERSION WITH DECENT SMOKE DISPERSAL EXPECTED
BY LATE THIS MORNING LASTING THROUGH THE AFTERNOON. CLEARING
INDICES EXPECTED TO CLIMB OVER 600 DURING THAT TIME. WINDS WILL
BE GENERALLY LIGHT AND SLOPE DRIVEN AT THE LOWER REACHES OF THE
BURN AREA...BUT BREEZY WESTERLIES WILL REMAIN IN PLACE ALONG THE
UPPER RIDGES THROUGH MIDDAY BEFORE GRADUALLY DIMINISHING DURING
THE MID TO LATE AFTERNOON HOURS. HUMIDITY WILL PLUMMET ONCE AGAIN
FOR THE AFTERNOON HOURS WITH SINGLE DIGIT VALUES LIKELY FOR MOST
IF NOT ALL OF THE BURN AREA. MOSTLY SUNNY SKIES WILL PERSIST
THOUGH WE DO EXPECT A NET INCREASE OF HIGH CLOUDS LATE DAY. THIS
COUPLED WITH EASTERN EXPOSURE OF BURN SITE SHOULD LOWER CLEARING
BACK BELOW 500 BY 2000 HOURS.

HUMIDITY TRENDS WILL BE GRADUALLY INCREASING BEGINNING
WEDNESDAY...BUT SO WILL TRANSPORT WINDS...THIS AS AN UPPER LOW
PRESSURE ENCROACHES FROM THE WEST. LOOKS LIKE AN EVEN BETTER DAY
CLEARING WISE. CLEARING APPEARS TO BE LOST THURSDAY AS TRANSPORT
WINDS DROP OFF AS THE LOW MOVES INTO SOUTHERN UTAH. NOT EXPECTING
PRECIP TO DEVELOP PRIOR TO FRIDAY ALTHOUGH CLOUDS/HUMIDITY WILL
BE. A GOOD CHANCE FOR SHOWERS EXISTS ON FRIDAY...BUT WETTING
RAINS DO NOT LOOK LIKELY AT THIS TIME.


.TODAY...
  LAL.................1.
  HAINES INDEX........3 ..VERY LOW.
  CLEARING INDEX......650.
  SKY/WEATHER.........MOSTLY SUNNY (15-25 PERCENT CLOUD COVER).
  MAX TEMPERATURE.....60-63.
  MIN HUMIDITY........7-10 PERCENT.
  WINDS - 20-FOOT.....DOWNSLOPE 3 TO 6 MPH BECOMING NORTHWEST WINDS
                      5 TO 10 MPH WITH GUSTS TO 15 MPH DOWN LOW. WEST
                      TO SOUTHWEST 15-25 MPH WITH GUSTS TO 30 MPH
                      UPPER RIDGES LATE MORNING THEN DECREASING
                      BY 1600.

.TONIGHT...
  LAL.................1.
  HAINES INDEX........3 ..VERY LOW.
  SKY/WEATHER.........PARTLY CLOUDY (35-45 PERCENT CLOUD COVER).
  MIN TEMPERATURE.....34-36.
  MAX HUMIDITY........34-36 PERCENT.
  WINDS - 20-FOOT.....NORTHWWEST WINDS 5 TO 10 MPH BECOMING DOWNSLOPE
                      3 TO 6 MPH BY 2000.

.OUTLOOK FOR WEDNESDAY...
  LAL.................1.
  HAINES INDEX........3 ..VERY LOW.
  CLEARING INDEX......1000.
  SKY/WEATHER.........PARTLY CLOUDY (45-55 PERCENT CLOUD COVER).
  MAX TEMPERATURE.....65-67.
  MIN HUMIDITY........15-19 PERCENT.
  WINDS - 20-FOOT.....DOWNSLOPE 5 MPH BECOMING TO NORTHWEST
                      10 TO 15 MPH WITH GUSTS TO 20 MPH
                      IN THE AFTERNOON. RIDGE GUSTS TO 35 MPH
                      IN THE AFTERNOON.



FORECASTER...MERRILL
REQUESTED BY...SCOTT ROBISON
REASON FOR REQUEST...PRESCRIBED
.TAG 20121009.HELLS.01/SLC

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