357
FNUS73 KLSX 131038
FWSLSX
SPOT FORECAST FOR SIOUX PASSAGE BLACK BUFFALO UNITS...ST. LOUIS COUNTY PARKS FORESTRY
NATIONAL WEATHER SERVICE SAINT LOUIS MO
538 AM CDT TUE OCT 13 2026
FORECAST IS BASED ON IGNITION TIME OF 0600 CDT ON OCTOBER 13.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE
NATIONAL WEATHER SERVICE.
DISCUSSION
MOISTURE WILL INCREASE THROUGH THE MORNING WITH DEWPOINTS RISING
THROUGH THE 60S THIS AFERNOON. MINIMUM RELATIVE HUMIDITY WILL BE
HIGHER THAN MONDAY WITH VALUES ABOVE 40 PERCENT. THE BEST MIXING
HEIGHTS AND VENTILLATION RATES WILL BE FROM APPROXIMATELY 2PM-5PM
THIS AFTERNOON WITH LIGHT SOUTHWESTERLY SURFACE WINDS. TEMPERATURES
REMAIN NEAR RECORD LEVEL WITH HIGHS IN THE MID-90S, ACCOMPANIED
BY HEAT INDICES NEAR 100 DEGREES.
TODAY
SKY/WEATHER.........SUNNY (5-15 PERCENT).
TEMPERATURE.........70 AT IGNITION...MAX 95.
RH..................61 PERCENT AT IGNITION...MIN 40 PERCENT.
EYE LEVEL WINDS.....SOUTHWEST WINDS AROUND 3-5 MPH.
MULTIPLICATION FACTOR 0.4 USED.
WIND (20 FT)........WINDS SOUTHWEST AT 6 MPH AT
IGNITION...OTHERWISE SOUTHWEST WINDS 6 TO 9
MPH.
MIXING HEIGHT.......500 FT AGL AT IGNITION...OTHERWISE MAX 5600 FT
AGL.
TRANSPORT WINDS.....SOUTHWEST 10 TO 16 MPH.
SMOKE DISPERSAL.....POOR /770 M/S-M/ AT IGNITION. MAX...GOOD /11200
M/S-M/.
TIME (CDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM
SKY (%).........12 0 1 1 1 7
WEATHER COV.....
WEATHER TYPE....NONE NONE NONE NONE NONE NONE
TSTM COV........
TEMP............70 72 80 88 93 95
RH..............61 64 58 50 44 40
20 FT WIND......SW 6 SW 7 SW 8 SW 8 SW 8 SW 7
20 FT WIND GUST.10 10 12 12 11 11
EYE LEVEL WIND..SW 3 SW 3 SW 4 SW 4 SW 4 SW 3
EYE LVL WND GST.5 5 6 6 5 5
MIX HGT (KFT)...0.5 0.7 1.9 3.3 5.0 5.6
TRANSPORT WIND..W 12 W 10 W 16 W 14 SW 14 SW 14
VRATE KT-FT/1K..5 6 26 40 60 67
VENTRATE CAT....POOR POOR POOR FAIR FAIR GOOD
FORECASTER...MAPLES
REQUESTED BY...JASON PRATTE
TYPE OF REQUEST...PRESCRIBED
.TAG 2623652.0/LSX
.DELDT 10/13/26
.FORMATTERVERSION 2.0.0
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