827  
FNUS74 KSJT 271131  
FWSSJT  
 
SPOT FORECAST FOR JETTON RX BT/ST...ULPBA  
NATIONAL WEATHER SERVICE SAN ANGELO TX  
631 AM CDT MON AUG 27 2018  
 
FORECAST IS BASED ON IGNITION TIME OF 0700 CDT ON AUGUST 27.  
PLEASE CONTACT OUR OFFICE AT 325-944-3030 IF YOU HAVE QUESTIONS  
OR CONCERNS WITH THIS FORECAST.  
   
DISCUSSION
 
 
LIGHT SOUTH WINDS GENERALLY LESS THAN 6 MPH AT 6 AM CDT WILL  
INCREASE TO AROUND 10 MPH AROUND 10 AM CDT THIS MORNING . A FEW  
GUSTS TO 18 MPH CAN BE EXPECTED FROM 10 AM CDT TO 7 PM CDT. MINIMUM RH  
VALUES AROUND 33 PERCENT CAN BE EXPECTED BETWEEN 4 TO 5 PM CDT.  
   
..412 AM CDT MORNING DISCUSSION BELOW
 
 
HOT AND DRY CONDITIONS WILL CONTINUE UNDER AN UPPER LEVEL RIDGE  
THIS WEEK. SOUTHEAST TO SOUTH WINDS OF 10 TO 15 MPH WITH  
OCCASIONAL DAYTIME GUSTS TO 25 MPH CAN BE EXPECTED EACH DAY, ALONG  
WITH MINIMUM RELATIVE HUMIDITY VALUES 25 TO 30 PERCENT.  
 
   
REST OF TODAY
 
 
SKY/WEATHER.........SUNNY (15-25 PERCENT).  
LAL.................NO TSTMS.  
MAX TEMPERATURE.....AROUND 96.  
MIN HUMIDITY........33 PERCENT.  
WIND (20 FT)........SOUTH WINDS 8 TO 10 MPH.  
MIXING HEIGHT.......300-1600 FT AGL INCREASING TO 7000-7400 FT AGL.  
TRANSPORT WINDS.....SOUTH 12 TO 17 MPH.  
SMOKE DISPERSAL.....POOR TO GOOD (2700-34000 KNOT-FT) INCREASING TO  
GOOD TO EXCELLENT (54400-97500 KNOT-FT) LATE IN  
THE MORNING.  
HAINES INDEX........2 TO 4 OR OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH TO OR LOW POTENTIAL FOR  
LARGE PLUME DOMINATED FIRE GROWTH.  
 
TIME (CDT) 7 AM 9 AM 11 AM 1 PM 3 PM 5 PM  
SKY (%).............34 20 12 3 4 5  
WEATHER COV.........  
WEATHER TYPE........NONE NONE NONE NONE NONE NONE  
TSTM COV............  
LAL.................1 1 1 1 1 1  
TEMP................71 76 85 92 96 96  
RH..................93 79 57 43 34 33  
20 FT WIND DIR......S S S S S S  
20 FT WIND SPD......8 10 10 9 9 10  
20 FT WIND GUST.....11 13 13 12 12 13  
MIX HGT (FT)........300 1600 3600 6400 7100 7000  
TRANSPORT WIND.....S 12 S 16 S 17 S 15 S 15 S 16  
HAINES INDEX........2 2 2 4 4 4  
SDSPL KT-FT/1000....3 22 54 83 92 98  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLEAR (10-20 PERCENT).  
LAL.................NO TSTMS.  
MIN TEMPERATURE.....AROUND 71.  
MAX HUMIDITY........93 PERCENT.  
WIND (20 FT)........SOUTH WINDS 7 TO 10 MPH.  
MIXING HEIGHT.......6000-6500 FT AGL DECREASING TO 100-800 FT AGL.  
TRANSPORT WINDS.....SOUTHEAST 9 TO 17 MPH SHIFTING TO THE SOUTH 18  
TO 21 MPH AFTER MIDNIGHT.  
SMOKE DISPERSAL.....GOOD TO EXCELLENT (48800-91100 KNOT-FT)  
DECREASING TO POOR TO FAIR (900-18800 KNOT-FT)  
IN THE LATE EVENING AND OVERNIGHT.  
HAINES INDEX........3 TO 4 OR OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH TO OR LOW POTENTIAL FOR  
LARGE PLUME DOMINATED FIRE GROWTH.  
 
TIME (CDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM  
SKY (%).............4 3 4 3 7 21  
WEATHER COV.........  
WEATHER TYPE........NONE NONE NONE NONE NONE NONE  
TSTM COV............  
LAL.................1 1 1 1 1 1  
TEMP................95 89 83 81 77 74  
RH..................34 42 53 63 76 87  
20 FT WIND DIR......S S SE SE S S  
20 FT WIND SPD......10 10 7 10 10 10  
20 FT WIND GUST.....15 13 10 13 17 13  
MIX HGT (FT)........6500 4100 100 600 700 500  
TRANSPORT WIND.....S 16 S 14 SE 9 S 17 S 21 S 18  
HAINES INDEX........4 4 4 4 3 3  
SDSPL KT-FT/1000....91 49 1 9 13 8  
   
TUESDAY
 
 
MAX TEMPERATURE.....AROUND 95.  
MIN HUMIDITY........34 PERCENT.  
WIND (20 FT)........SOUTH WINDS 8 TO 12 MPH.  
MIXING HEIGHT.......200-1800 FT AGL INCREASING TO 5000-6700 FT AGL.  
TRANSPORT WINDS.....SOUTH 15 TO 18 MPH.  
SMOKE DISPERSAL.....POOR TO GOOD (3400-40100 KNOT-FT) INCREASING TO  
GOOD TO EXCELLENT (55400-91900 KNOT-FT) IN THE  
AFTERNOON.  
 
TIME (CDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM  
TEMP................73 72 80 88 93 95  
RH..................90 90 67 50 40 35  
20 FT WIND DIR......S S S S S S  
20 FT WIND SPD......9 9 10 10 10 10  
20 FT WIND GUST.....12 12 13 15 17 17  
MIX HGT (FT)........300 700 1800 4000 5600 6700  
TRANSPORT WIND.....S 18 S 17 S 16 S 16 S 16 S 15  
SDSPL KT-FT/1000....5 11 25 55 78 87  
   
FORECAST DAYS 3 THROUGH 5
 
   
WEDNESDAY
 
 
MOSTLY CLEAR. LOWS IN THE LOWER 70S. HIGHS IN THE MID 90S. SOUTH  
WINDS AROUND 9 MPH.    
THURSDAY
 
 
MOSTLY CLEAR. LOWS AROUND 70. HIGHS IN THE MID 90S. SOUTHEAST  
WINDS AROUND 7 MPH.    
FRIDAY
 
 
MOSTLY CLEAR. LOWS AROUND 70. HIGHS IN THE MID 90S. SOUTH WINDS  
AROUND 7 MPH.  
 

 
FORECASTER...DECKER  
REQUESTED BY...SAM JETTON  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1815045.0/SJT  
.DELDT 08/27/18  
 
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