824  
FNUS75 KSLC 101203  
FWSSLC  
 
SPOT FORECAST FOR CARTER CREEK RX...USFS  
NATIONAL WEATHER SERVICE SALT LAKE CITY UT  
603 AM MDT SAT MAY 10 2025  
 
FORECAST IS BASED ON IGNITION TIME OF 0700 MDT ON MAY 10.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
HIGH PRESSURE WILL GRADUALLY SLIDE OVERHEAD THROUGH  
THE DAY SATURDAY. AS SUCH, PRECIPITATION CHANCES WILL REMAIN  
QUITE MINIMAL, WINDS FAIRLY LIGHT, AND CONDITIONS DRY. DESPITE  
THAT, STRONG MIXING AND MODEST TRANSPORT WINDS WILL SUPPORT  
EXCELLENT VENTILATION AND ASSOCIATED CLEARING INDEX VALUES. A WEAK  
EMBEDDED SYSTEM WILL PASS THROUGH SUNDAY AS THE HIGH SHIFTS EAST,  
WHICH WILL RESULT IN AN INCREASE IN WIND MAGNITUDES AS WELL AS  
ISOLATED TO SCATTERED AFTERNOON SHOWERS AND THUNDERSTORMS. GIVEN  
THE PRECIP CHANCES AND SLIGHT UPTICK IN MOISTURE, HUMIDITY VALUES  
WILL TREND UPWARD SLIGHTLY. VENTILATION/CLEARING INDEX VALUES  
REMAIN EXCELLENT.  
   
REST OF TODAY
 
 
SKY/WEATHER.........MOSTLY SUNNY (20-30 PERCENT CLOUD COVER).  
CWR.................0 PERCENT.  
CHANCE OF PCPN......10 PERCENT.  
CHANCE OF LIGHTNING.13 PERCENT.  
MAX TEMPERATURE.....AROUND 70.  
MIN HUMIDITY........20-25 PERCENT.  
WIND (20 FT)........SOUTH WINDS 3-7 MPH BECOMING WEST TO  
SOUTHWEST 5-10 MPH IN THE AFTERNOON.  
MIXING HEIGHT.......10500 FT AGL.  
TRANSPORT WINDS.....SOUTH 15 TO 17 MPH.  
CLEARING INDEX......1000+.  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLEAR (25-35 PERCENT CLOUD COVER).  
CWR.................0 PERCENT.  
CHANCE OF PCPN......10 PERCENT.  
CHANCE OF LIGHTNING.4 PERCENT.  
MIN TEMPERATURE.....45-47.  
MAX HUMIDITY........50-52 PERCENT.  
WIND (20 FT)........SOUTH WINDS 5-10 MPH.  
MIXING HEIGHT.......1200 FT AGL.  
TRANSPORT WINDS.....SOUTH 17 TO 22 MPH.  
   
SUNDAY
 
 
SKY/WEATHER.........PARTLY CLOUDY (40-50 PERCENT CLOUD COVER).  
CHANCE OF RAIN SHOWERS AND SLIGHT CHANCE OF  
THUNDERSTORMS IN THE AFTERNOON.  
CWR.................20 PERCENT.  
CHANCE OF PCPN......50 PERCENT.  
CHANCE OF LIGHTNING.21 PERCENT.  
MAX TEMPERATURE.....66-68.  
MIN HUMIDITY........25-30 PERCENT.  
WIND (20 FT)........SOUTH WINDS INCREASING TO 7-15 MPH THROUGH THE  
MORNING. BY LATE MORNING ON THROUGH THE  
AFTERNOON, WINDS FURTHER INCREASE TO 15-20 MPH  
WITH GUSTS AROUND 30-35 MPH. GUSTY AND  
ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS IN  
THE AFTERNOON.  
MIXING HEIGHT.......9000 FT AGL.  
TRANSPORT WINDS.....SOUTHWEST 36 TO 37 MPH.  
CLEARING INDEX......1000+.  
 

 
FORECASTER...WARTHEN  
REQUESTED BY...TREVER HUNT  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2513589.1/SLC  
.DELDT 05/10/25  
.FORMATTERVERSION 2.0.0  
.EMAIL TREVER.HUNT@USDA.GOV  
 
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