941
FNUS73 KLSX 090946
FWSLSX
SPOT FORECAST FOR WEST TYSON EAST...ST. LOUIS COUNTY PARKS FORESTRY
NATIONAL WEATHER SERVICE SAINT LOUIS MO
446 AM CDT THU APR 9 2026
FORECAST IS BASED ON IGNITION TIME OF 1100 CDT ON APRIL 09.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE
NATIONAL WEATHER SERVICE.
DISCUSSION
ANOTHER DAY OF ABOVE AVERAGE TEMPERATURES IS EXPECTED TODAY ALONG
WITH MOISTURE SLOW TO INCREASE. AS A RESULT, FROM IGNITION TIME
THROUGH THE AFTERNOON RH WILL REACH BETWEEN 27 AND 35 PERCENT.
SOUTHWESTERLY WINDS OF 10 TO 12 MPH AND SEASONABLY HIGH MIXING
HEIGHTS OF 5000 TO 9000 FT AGL WILL SUPPORT GOOD SMOKE DISPERSAL
FROM IGNITION THROUGH THE AFTERNOON. AROUND 6 TO 7 PM, A TEMPERATURE
INVERSION WILL QUICKLY DEVELOP WITH WINDS BECOMING SOUTHERLY AND
LIGHTER ALONG WITH SMOKE DISPERSAL BECOMING POOR.
REST OF TODAY
SKY/WEATHER.........SUNNY (5-15 PERCENT).
TEMPERATURE.........74 AT IGNITION...MAX 81.
RH..................35 PERCENT AT IGNITION...MIN 29 PERCENT.
EYE LEVEL WINDS.....WINDS SOUTHWEST AT 4 TO 5 MPH WITH GUSTS UP TO
9 MPH. AN ADJUSTMENT FACTOR OF 0.4 IS USED.
WIND (20 FT)........WINDS SOUTHWEST AT 10 TO 12 MPH WITH GUSTS UP TO
22 MPH.
MIXING HEIGHT.......3400 FT AGL AT IGNITION...OTHERWISE MAX 8700 FT
AGL.
TRANSPORT WINDS.....SOUTHWEST 18 TO 22 MPH.
SMOKE DISPERSAL.....GOOD /10040 M/S-M/ AT IGNITION. MAX...EXCELLENT
/22580 M/S-M/.
TIME (CDT) 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM 8PM 9PM 10P
SKY (%).........5 3 4 3 8 16 14 27 18 18 13 15
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
TEMP............74 76 78 80 80 80 79 78 76 72 69 67
RH..............35 33 31 29 29 29 31 31 36 39 44 49
20 FT WIND DIR..SW SW SW SW S S S S S S S S
20 FT WIND SPD..9 10 10 10 10 9 8 7 6 6 6 6
20 FT WIND GUST.18 18 17 16 16 16 16 16 13 13 14 14
EYE LVL WND DIR.SW SW SW SW S S S S S S S S
EYE LVL WND SPD.4 5 5 5 5 4 4 3 3 3 3 3
EYE LVL WND GST.8 8 8 7 7 7 7 7 6 6 6 6
MIX HGT (KFT)...3.4 6.3 8.0 8.3 8.6 8.7 8.0 3.9 0.7 0.5 0.6 0.6
TRANSP WIND DIR.SW SW SW SW SW S S S S S S S
TRANSP WIND SPD.22 22 21 20 18 18 20 17 14 13 14 15
VRATE KT-FT/1K..64 120 144 142 138 140 136 59 8 6 7 7
VENTRATE CAT....GD VGD VGD VGD VGD VGD VGD FR PR PR PR PR
FORECASTER...PFAHLER
REQUESTED BY...JASON PRATTE
TYPE OF REQUEST...PRESCRIBED
.TAG 2609599.0/LSX
.DELDT 04/09/26
.FORMATTERVERSION 2.0.0
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