137  
FNUS74 KFWD 211238  
FWSFWD  
 
SPOT FORECAST FOR RX BURN - DEMO PRAIRIE...CITY OF FORT WORTH  
NATIONAL WEATHER SERVICE FORT WORTH TX  
738 AM CDT THU OCT 21 2021  
 
FORECAST IS BASED ON IGNITION TIME OF 0800 CDT ON OCTOBER 21.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
 
GUSTY NE WINDS EARLY TODAY WILL GRADUALLY WEAKEN IN SPEED LATE  
THIS MORNING AND EARLY THIS AFTERNOON AND REMAIN OUT OF THE NE. RH  
SHOULD ALSO FALL QUICKLY BETWEEN 09-11L AND EVENTUALLY BOTTOM OUT  
AROUND 35 PERCENT. THERE IS NO CHANCE OF RAIN OR THUNDERSTORMS  
WITH PARTLY CLOUDY SKIES EARLY BECOMING SUNNY LATER IN THE DAY.  
NEAR CALM TO LIGHT AND VARIABLE WINDS ARE EXPECTED TONIGHT WITH A  
TRAPPING INVERSION DEVELOPING WITHIN A FEW HUNDRED FEET ABOVE THE  
SURFACE. E-SE WINDS RETURN TOMORROW ALONG WITH RH RISING TO AROUND  
40-45 PERCENT.  
 
   
REST OF TODAY
 
 
SKY/WEATHER.........SUNNY (15-25 PERCENT).  
MAX TEMPERATURE.....AROUND 81.  
MIN HUMIDITY........35 PERCENT.  
WIND (20 FT)........NORTHEAST WINDS 8 TO 12 MPH BECOMING 5 TO 8 MPH  
IN THE AFTERNOON.  
MIXING HEIGHT.......3200 FT AGL.  
TRANSPORT WINDS.....NORTHEAST 3 TO 8 MPH.  
HAINES INDEX........3 TO 5 OR MODERATE POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
 
TIME (CDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........29 16 9 9 17 15 23 21 24 26  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
TEMP............62 64 67 70 74 76 78 79 79 79  
RH..............70 65 54 51 44 43 37 36 36 36  
20 FT WIND DIR..N NE NE NE NE NE NE NE NE NE  
20 FT WIND SPD..10 10 9 8 8 8 7 7 6 6  
20 FT WIND GUST.15 15 13 12  
MIX HGT (KFT)...0.7 0.9 1.3 1.5 2.1 2.5 2.8 3.1 3.2 3.1  
TRANSP WIND DIR.NE NE NE NE NE NE NE NE NE NE  
TRANSP WIND SPD.12 6 6 6 5 5 3 3 3 3  
HAINES INDEX....4 4 5 4 4 3 3 3 3 3  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLEAR (5-15 PERCENT).  
MIN TEMPERATURE.....AROUND 58.  
MAX HUMIDITY........75 PERCENT.  
WIND (20 FT)........NORTHEAST WINDS 5 TO 8 MPH EARLY IN THE EVENING  
BECOMING LIGHT AFTER 19L.  
MIXING HEIGHT.......300 FT AGL.  
TRANSPORT WINDS.....EAST 3 TO 7 MPH.  
HAINES INDEX........3 TO 5 OR MODERATE POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
 
TIME (CDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........14 9 9 4 5 1 1 2 2 3 3 7  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
TEMP............77 74 72 69 67 65 63 63 62 61 60 59  
RH..............37 43 46 51 54 58 62 60 65 65 67 69  
20 FT WIND DIR..NE NE NE NE NE E E E E E E E  
20 FT WIND SPD..6 5 4 3 3 3 3 3 3 3 3 3  
20 FT WIND GUST.  
MIX HGT (KFT)...1.9 0.6 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3  
TRANSP WIND DIR.E NE NE NE E E E E E E E E  
TRANSP WIND SPD.3 5 7 7 7 6 5 3 3 3 3 5  
HAINES INDEX....3 3 4 4 5 5 5 5 5 5 5 5  
   
FRIDAY
 
 
SKY/WEATHER.........SUNNY (15-25 PERCENT).  
MAX TEMPERATURE.....AROUND 83.  
MIN HUMIDITY........44 PERCENT.  
WIND (20 FT)........EAST WINDS 4 TO 7 MPH EARLY IN THE MORNING  
BECOMING LIGHT, THEN BECOMING SOUTHEAST 5 TO 7  
MPH IN THE LATE MORNING.  
MIXING HEIGHT.......4600 FT AGL.  
TRANSPORT WINDS.....SOUTHEAST 7 TO 9 MPH.  
HAINES INDEX........3 TO 5 OR MODERATE POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
 
TIME (CDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........10 40 39 38 37 30 23 16 12 8 4 3  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
TEMP............58 59 62 64 67 70 74 77 79 80 82 81  
RH..............72 75 70 67 63 57 51 47 45 45 44 46  
20 FT WIND DIR..E E E E E E SE SE SE S S S  
20 FT WIND SPD..3 3 3 5 6 6 7 7 7 8 8 7  
20 FT WIND GUST. 4  
MIX HGT (KFT)...0.4 0.4 0.7 1.0 1.2 2.0 2.8 3.6 4.0 4.3 4.6 3.3  
TRANSP WIND DIR.SE SE SE SE SE SE SE SE S S S S  
TRANSP WIND SPD.6 7 8 9 9 9 8 8 8 9 9 9  
HAINES INDEX....5 5 5 5 5 4 4 3 3 3 3 3  
 

 
FORECASTER...BONNETTE  
REQUESTED BY...DANIEL PRICE  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2119871.0/FWD  
.DELDT 10/21/21  
.FORMATTERVERSION 1.0.26  
.EMAIL DANIEL.PRICE@FORTWORTHTEXAS.GOV  
 
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