FNUS75 KSLC 022009
FWSSLC

SPOT FORECAST FOR HELLS HOLLOW RX
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
209 PM MDT TUE OCT 2 2012

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM MDT TONIGHT FOR
GUSTY WINDS AND LOW RELATIVE HUMIDITY...
...RED FLAG WARNING FROM 10 AM TO 8 PM MDT WEDNESDAY FOR GUSTY
WINDS AND LOW RELATIVE HUMIDITY...

.DISCUSSION...A COLD TROUGH DESCENDING SOUTH FROM BRITISH COLUMBIA
WILL SKIRT FAR NORTHERN UTAH LATE TONIGHT THROUGH WEDNESDAY.
WINDS ALOFT HAVE INCREASED TODAY AS THE SYSTEM APPROACHES
ALLOWING FOR INCREASED TRANSPORT WINDS ALLOWING FOR HIGH CLEARING
VALUES...BUT WILL CONTINUE TO TREND TO INCREASE AT THE SURFACE AS
WELL. GIVEN WINDS AND BONE DRY CONDITIONS IN PLACE CRITICAL FIRE
WEATHER CONDITIONS ARE EXPECTED TO DEVELOP AT THE HELLS HOLLOW
SITE THROUGH THIS EVENING. WINDS ARE EXPECTED TO DECOUPLE
OVERNIGHT...ESPECIALLY DOWN LOW ON THE SITE...ALLOWING FOR
LIGHTER DRAINAGE CONDITIONS TO DEVELOP.

THE SKIRTING STORM WILL SURGE A STRONG BUT DRY COLD FRONT THROUGH
THE AREA WEDNESDAY MORNING. PASSAGE APPEARS MOST LIKELY IN THE
10-1200 TIMEFRAME. WINDS WILL SWITCH FROM WEST TO NORTH-NORTHWEST
AND BECOME INCREASINGLY GUSTY FOR THE AFTERNOON HOURS. CLEARING
AGAIN WILL BE EXCELLENT BUT AFTERNOON GUSTS WILL LIKELY BE EDGING
ON 30 MPH WITH SOME STRONGER GUSTS ACROSS THE EXPOSED RIDGES.
CRITICAL FIRE WEATHER CONDITIONS ARE EXPECTED TO DEVELOP AGAIN
LATE MORNING AND THROUGH THE AFTERNOON.

POST FRONTAL CLEARING INDEX VALUES WILL BE REDUCED A BIT FOR
THURSDAY...AS WILL THE WINDS...BUT CI IS EXPECTED TO REMAIN
ABOVE 500.


.REST OF TODAY...
  LAL.................1.
  HAINES INDEX........3 ..VERY LOW.
  CLEARING INDEX......1000+.
  SKY/WEATHER.........SUNNY (0-10 PERCENT CLOUD COVER).
  MAX TEMPERATURE.....70-73.
  MIN HUMIDITY........14-17 PERCENT.
  WINDS - 20-FOOT.....NORTHWEST 9 TO 16 MPH WITH GUSTS TO 20 MPH
                      AT THE LOWER ELEVATIONS...SOUTHWEST 15 TO
                      20 MPH WITH GUSTS TO 30 MPH EXPOSED RIDGES.

.TONIGHT...
  LAL.................1.
  HAINES INDEX........3 ..VERY LOW.
  SKY/WEATHER.........MOSTLY CLEAR (5-15 PERCENT CLOUD COVER).
  MIN TEMPERATURE.....45-49.
  MAX HUMIDITY........59-66 PERCENT.
  WINDS - 20-FOOT.....NORTH WINDS 20 MPH BECOMING DOWNSLOPE
                      4 TO 7 MPH AFTER 2200.

.OUTLOOK FOR WEDNESDAY...
  LAL.................1.
  HAINES INDEX........4 ..LOW.
  CLEARING INDEX......1000+.
  SKY/WEATHER.........MOSTLY SUNNY (20-30 PERCENT CLOUD COVER) THEN
                      BECOMING PARTLY CLOUDY (30-40 PERCENT CLOUD
                      COVER).
  MAX TEMPERATURE.....54-56.
  MIN HUMIDITY........14-18 PERCENT.
  WINDS - 20-FOOT.....DOWNSLOPE 4 TO 7 MPH BECOMING WEST NORTHWEST
                      10 TO 15 MPH WITH GUSTS TO 20 MPH AFTER 0900.
                      BECOMING NORTHWEST 15 TO 25 MPH WITH GUSTS TO
                      30 MPH IN THE AFTERNOON.



FORECASTER...MERRILL
REQUESTED BY...SCOTT ROBISON
REASON FOR REQUEST...PRESCRIBED
.TAG 20121003.HELLS.01/SLC

$$