030  
FNUS74 KEWX 201109  
FWSEWX  
 
SPOT FORECAST FOR CADET CLASS 124 LIVE FIRE EXERCISE...AUSTIN FIRE DEPARTMENT  
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX  
609 AM CDT FRI APR 20 2018  
 
FORECAST IS BASED ON IGNITION TIME OF 0600 CDT ON APRIL 20.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
 
MOSTLY CLOUDY SKIES WILL PERSIST ACROSS THE CADET CLASS 124 LIVE FIRE EXERCISE  
AREA TODAY. WINDS WILL BE FROM THE NORTHEAST FOR THE NEXT FEW  
HOURS AND THEN SHIFTING TO THE EAST AROUND 8 AM WITH ANOTHER SHIFT  
TO THE SOUTHEAST AROUND 2 PM THIS AFTERNOON. WIND SPEEDS WILL  
RANGE FROM 5 TO 10 MPH WITH GUSTS UP TO 15 MPH THROUGHOUT THE DAY.  
RELATIVE HUMIDITY WILL DROP BELOW THE 50 PERCENT MARK AFTER 1 PM  
THIS AFTERNOON BUT VALUES REMAIN ELEVATED THROUGH THE PERIOD. AN  
UPPER LEVEL DISTURBANCE MOVING ACROSS THE SOUTHERN PART OF THE RIO  
GRANDE PLAINS WILL CONTINUE TO PUSH TO THE EAST AND PRODUCE SOME  
SHOWERS OVER THAT AREA, BUT BY THE TIME IT MOVES NEAR AUSTIN, WE  
ARE NOT EXPECTING SHOWER ACTIVITY TO AFFECT THE AREA.  
 
   
TODAY
 
 
SKY/WEATHER.........PARTLY SUNNY (65-75 PERCENT).  
CWR.................1 PERCENT.  
LAL.................NO TSTMS.  
MAX TEMPERATURE.....AROUND 70.  
MIN HUMIDITY........49 PERCENT.  
EYE LEVEL WINDS.....SOUTHEAST WINDS 5 TO 9 MPH.  
WIND (20 FT)........SOUTHEAST WINDS 5 TO 9 MPH.  
MIXING HEIGHT.......200-1800 FT AGL INCREASING TO 2300-4000 FT AGL  
LATE IN THE MORNING.  
TRANSPORT WINDS.....SOUTHEAST 6 TO 15 MPH INCREASING TO 15 TO 16  
MPH LATE IN THE AFTERNOON.  
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) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........72 72 75 79 82 78 73 69 64 59 54 54  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
CWR.............0 0 0 0 0 0 0 0 0 0 0 0  
LAL.............1 1 1 1 1 1 1 1 1 1 1 1  
TEMP............52 52 54 56 58 61 63 65 67 67 68 69  
RH..............71 74 69 66 62 58 56 54 50 50 49 49  
20 FT WIND DIR..NE NE E E E E E E SE SE SE SE  
20 FT WIND SPD..5 6 6 8 9 9 9 9 9 9 9 9  
20 FT WIND GUST.6 7 10 12 13 13 13 13 13 13 13 13  
EYE LVL WND DIR.NE NE E E E E E E SE SE SE SE  
EYE LVL WND SPD.4 4 4 6 7 7 7 7 7 7 7 7  
EYE LVL WND GST.5 5 7 9 10 10 10 10 10 10 10 10  
MIX HGT (KFT)...0.2 0.2 0.6 1.4 1.8 2.3 3.2 3.6 3.7 3.9 4.0 3.6  
TRANSP WIND DIR.NE NE NE E E E SE SE SE SE SE SE  
TRANSP WIND SPD.6 6 7 8 10 12 14 15 15 16 16 15  
HAINES INDEX....4 4 4 4 4 3 3 3 3 3 2 2  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT). CHANCE OF  
SHOWERS AND THUNDERSTORMS AFTER MIDNIGHT.  
CWR.................6 PERCENT.  
LAL.................NO TSTMS UNTIL 0100, THEN 9-15 STRIKES.  
MIN TEMPERATURE.....AROUND 56.  
MAX HUMIDITY........95 PERCENT.  
EYE LEVEL WINDS.....SOUTHEAST WINDS 6 TO 9 MPH.  
WIND (20 FT)........SOUTHEAST WINDS 6 TO 9 MPH. GUSTY AND ERRATIC  
WINDS EXPECTED NEAR THUNDERSTORMS AFTER  
MIDNIGHT.  
MIXING HEIGHT.......2100-3000 FT AGL DECREASING TO 400-1600 FT AGL  
IN THE LATE EVENING AND OVERNIGHT.  
TRANSPORT WINDS.....SOUTHEAST 12 TO 16 MPH.  
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
   
SATURDAY
 
 
SKY/WEATHER.........CLOUDY (85-95 PERCENT). CHANCE OF SHOWERS AND  
THUNDERSTORMS EARLY IN THE MORNING, THEN  
SHOWERS AND THUNDERSTORMS LIKELY.  
CWR.................6 PERCENT INCREASING TO 36 PERCENT IN THE  
MORNING, THEN DECREASING TO 24 PERCENT IN THE  
AFTERNOON.  
LAL.................9-15 STRIKES UNTIL 0700, THEN 16-25 STRIKES.  
MAX TEMPERATURE.....AROUND 74.  
MIN HUMIDITY........69 PERCENT.  
EYE LEVEL WINDS.....SOUTH WINDS 5 TO 9 MPH.  
WIND (20 FT)........SOUTH WINDS 5 TO 9 MPH. GUSTY AND ERRATIC WINDS  
EXPECTED NEAR THUNDERSTORMS.  
MIXING HEIGHT.......700-1600 FT AGL.  
TRANSPORT WINDS.....SOUTHEAST 10 TO 18 MPH SHIFTING TO THE SOUTH 13  
TO 20 MPH IN THE AFTERNOON.  
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.  
 

 
FORECASTER...17  
REQUESTED BY...MARK STINSON  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1807143.0/EWX  
.DELDT 04/20/18  
.EMAIL MARK.STINSON@AUSTINTEXAS.GOV  
 
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