FNUS75 KSLC 071853
FWSSLC

SPOT FORECAST FOR HELLS HOLLOW
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1253 PM MDT SUN OCT 7 2012

.DISCUSSION...SUBTLE DIFFERENCES IN WINDS THE NEXT COUPLE OF DAYS
WILL HAVE SIGNIFICANT IMPACTS ON SMOKE DISPERSAL AT THE FIRE SITE.
FOR MONDAY LIGHT WINDS AND A STABLE AIRMASS WILL PRODUCE LOW CLEARING
INDICES DURING THE MORNING. LATE MORNING AND AFTERNOON HEATING
COMBINED WITH A MODEST INCREASING WEST WINDS OFF THE SURFACE SHOULD
PRODUCE A PERIOD OF ADEQUATE CLEARING INDICES DURING THE AFTERNOON.
DECREASING WINDS AND EXPOSURE OF THE FIRE ON THE EAST ASPECT SHOULD
LEAD TO CLEARING INDICES FALLING BELOW ACCEPTABLE LEVELS AFTER 1700.
WINDS TUESDAY WILL BE LIGHTER THAN ON MONDAY. AT THIS TIME IT DOES
NOT APPEAR THAT ANY PROLONGED PERIOD OF ACCEPTABLE CLEARING INDICES
WILL EXIST.

WINDS AND MIXING DEPTHS WILL BOTH INCREASE WEDNESDAY...LEADING TO
GREATER CLEARING INDICES. THURSDAY WILL HAVE SIMILAR WINDS AND
MIXING DEPTHS...BUT RH VALUES WILL BE A BIT HIGHER DURING THE
AFTERNOON. FRIDAY WILL LIKELY SEE SHOWERS MOVING THROUGH THE AREA...
THOUGH WETTING RAIN MAY NOT DEVELOP FROM THIS PRECIPITATION EVENT.

.REST OF TODAY...
  LAL.................1.
  HAINES INDEX........3 ..VERY LOW.
  CLEARING INDEX......230.
  SKY/WEATHER.........SUNNY (0-5 PERCENT CLOUD COVER).
  MAX TEMPERATURE.....56-58.
  MIN HUMIDITY........11-13 PERCENT.
  WINDS - 20-FOOT.....SOUTHWEST WINDS 5 TO 9 MPH WITH GUSTS TO 12
                      MPH.

.TONIGHT...
  LAL.................1.
  HAINES INDEX........4 ..LOW.
  SKY/WEATHER.........MOSTLY CLEAR (5-15 PERCENT CLOUD COVER).
  MIN TEMPERATURE.....20-22.
  MAX HUMIDITY........37-40 PERCENT.
  WINDS - 20-FOOT.....SOUTHWEST WINDS 5 TO 8 MPH....BECOMING WEST
                      NORTHWEST 4 TO 7 MPH AFTER 2100.

.OUTLOOK FOR MONDAY...
  LAL.................1.
  HAINES INDEX........4 ..LOW.
  CLEARING INDEX......180 THROUGH 1000...INCREASING TO 530 BY 1300.
  SKY/WEATHER.........MOSTLY SUNNY (10-20 PERCENT CLOUD COVER).
  MAX TEMPERATURE.....58-60
  MIN HUMIDITY........10-12 PERCENT.
  WINDS - 20-FOOT.....WEST WINDS 4 TO 7 MPH...INCREASING TO 8 TO 12
                      MPH AFTER 1000. GUSTS AROUND 18 MPH AFTER
                      1300.



FORECASTER...CONGER
REQUESTED BY...Scott Robison
REASON FOR REQUEST...PRESCRIBED
.TAG 20121008.HELLS.01/SLC

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