####018002226####
FNUS75 KSLC 041925

FWSSLC



SPOT FORECAST FOR THOMPSON BASIN PILES

NATIONAL WEATHER SERVICE SALT LAKE CITY UT

1225 PM MST WED FEB 4 2009



.DISCUSSION...THE RIDGE OF HIGH PRESSURE THAT HAS BEEN OVER THE

REGION THE LAST FEW DAYS WILL MOVE EASTWARD DUE TO A TROUGH OF LOW

PRESSURE MOVING IN THURSDAY. THIS SYSTEM WILL BE WEAKENING AS IT

MOVES INTO UTAH SO IT WILL NOT COMPLETELY ERODE THE INVERSION THAT

IS SO STRONGLY ENTRENCHED BELOW ABOUT 7000 FT MSL. HOWEVER...SOUTH WINDS

ABOVE THIS INVERSION HEIGHT OF 7000 FT MSL WILL INCREASE TO 20 TO

30 MPH BY THURSDAY AFTERNOON. THEREFORE...THE CLEARING INDEX WILL

BE ABOVE 500 ABOVE THE 7000 FT LEVEL AREAS OF YOUR PROJECT THAT

ARE EXPOSED TO SOUTHWINDS. THE EXACT HEIGHT OF THIS INVERSION CAN

BE OFF BY A FEW HUNDRED FEET...SO PLAN ON THE HIGHER PORTION OF

THE PROJECT HAVING THE BEST CLEARING INDEX AND GETTING POORER AS

YOU DROP BELOW 7000 FT.



.REST OF TODAY...

  LAL.................1. 

  HAINES INDEX........4 ..LOW. 

  CLEARING INDEX......80. 

  SKY/WEATHER.........SUNNY (0-10 PERCENT CLOUD COVER). 

  MAX TEMPERATURE.....45-47. 

  MIN HUMIDITY........31-33 PERCENT. 

  WINDS - 20-FOOT.....SOUTHEAST WINDS 5 MPH. 



.TONIGHT...

  LAL.................1. 

  HAINES INDEX........4 ..LOW. 

  SKY/WEATHER.........MOSTLY CLEAR (25-35 PERCENT CLOUD COVER). 

  MIN TEMPERATURE.....24-26. 

  MAX HUMIDITY........60-62 PERCENT. 

  WINDS - 20-FOOT.....SOUTH WINDS 5 TO 10 MPH. 



.OUTLOOK FOR THURSDAY...

  LAL.................1. 

  HAINES INDEX........3 ..VERY LOW. 

  CLEARING INDEX......370 AT 6200 FT...AND 650 OVER 7000 FT. 

  SKY/WEATHER.........PARTLY CLOUDY (50-60 PERCENT CLOUD COVER) 

                      THEN BECOMING MOSTLY CLOUDY (70-80 PERCENT 

                      CLOUD COVER). 

  MAX TEMPERATURE.....45-47. 

  MIN HUMIDITY........35-37 PERCENT. 

  WINDS - 20-FOOT.....SOUTH WINDS 15-25 MPH AFTER 1300 MST ABOVE 

                      7000 FT AND UPSLOPE TO AT TIMES SOUTH AT 5 

                      TO 10 MPH BELOW 7000 FT. 







FORECASTER...STRUTHWOLF

REQUESTED BY...RYAN MCCOLLIN

REASON FOR REQUEST...PRESCRIBED

.TAG 20090204.THOMP.01/SLC



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