094
FNUS73 KLSX 201153
FWSLSX
SPOT FORECAST FOR CONFLUENCE PRAIRIES...DNR
NATIONAL WEATHER SERVICE SAINT LOUIS MO
553 AM CST TUE JAN 20 2026
FORECAST IS BASED ON IGNITION TIME OF 1100 CST ON JANUARY 20.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE
NATIONAL WEATHER SERVICE.
DISCUSSION
HIGH TEMPERATURES WILL BE CLOSE TO NORMAL TODAY WITH MINIMUM RELATIVE
HUMIDITY VALUES AROUND 30 PERCENT. MIXING HEIGHTS WILL CLIMB THIS AFTERNOON
TO AROUND 3000 FEET RESULTING IN GOOD SMOKE DISPERSAL. WINDS WILL BE OUT OF
THE SOUTH DURING THE DAY TODAY AT 5 TO 10 MPH.
DRY WEATHER IS EXPECTED THROUGH WEDNESDAY WITH TEMPERATURES STAYING NEAR OR
JUST ABOVE NORMAL. A COLD FRONT WILL MOVE THROUGH THE SITE ON WEDNESDAY
MORNING CAUSING WINDS TO SHIFT OUT OF THE SOUTHWEST AND BECOMING GUSTY.
MIXING HEIGHTS ARE EXPECTED TO CLIMB BACK TO AROUND TO 3600 FEET WITH GOOD
SMOKE DISPERSION IN THE AFTERNOON WITH MINIMUM RELATIVE HUMIDITY VALUES
AROUND 45 PERCENT.
REST OF TODAY
SKY/WEATHER.........MOSTLY SUNNY (30-40 PERCENT).
CWR.................0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
TEMPERATURE.........25 AT IGNITION...MAX 36.
RH..................38 PERCENT AT IGNITION...MIN 31 PERCENT.
EYE LEVEL WINDS.....WINDS AROUND 5 MPH WITH AN ADJUSTMENT FACTOR OF 0.5
WIND (20 FT)........WINDS SOUTH AT 8 MPH AT IGNITION...OTHERWISE
SOUTH WINDS 8 TO 10 MPH.
MIXING HEIGHT.......2200 FT AGL AT IGNITION...OTHERWISE MAX 3000 FT
AGL.
TRANSPORT WINDS.....SOUTH 14 TO 22 MPH.
SMOKE DISPERSAL.....MARGINAL /5070 M/S-M/ AT IGNITION. MAX...GOOD
/8920 M/S-M/.
TIME (CST) 11 AM 1 PM 3 PM 5 PM 7 PM 9 PM
SKY (%).........44 40 20 22 38 54
WEATHER COV.....
WEATHER TYPE....NONE NONE NONE NONE NONE NONE
TSTM COV........
CWR.............0 0 0 0 0 0
CHC OF THDR (%).0 0 0 0 0 0
TEMP............25 32 35 33 30 29
RH..............38 31 32 38 42 42
20 FT WIND......S 8 S 10 S 10 S 9 S 10 S 11
20 FT WIND GUST.12 15 15 14 16 19
EYE LEVEL WIND..S 4 S 5 S 5 S 4 S 5 S 5
EYE LVL WND GST.6 7 7 6 7 9
MIX HGT (KFT)...2.2 2.6 3.0 0.8 0.6 0.8
TRANSPORT WIND..S 17 S 20 S 22 S 14 S 18 S 20
VRATE KT-FT/1K..32 44 57 10 10 14
VENTRATE CAT....POOR FAIR FAIR POOR POOR POOR
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY (35-45 PERCENT) THEN BECOMING
MOSTLY CLOUDY (65-75 PERCENT).
CWR.................10 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
TEMPERATURE.........MIN 27.
RH..................MAX 72 PERCENT.
EYE LEVEL WINDS.....WINDS AROUND 6 MPH WITH AN ADJUSTMENT FACTOR OF 0.5
WIND (20 FT)........SOUTH WINDS 9 TO 11 MPH WITH GUSTS TO AROUND 19
MPH SHIFTING TO THE SOUTHWEST AROUND 9 MPH WITH
GUSTS TO AROUND 18 MPH EARLY IN THE MORNING.
MIXING HEIGHT.......MIN 600 FT AGL.
TRANSPORT WINDS.....SOUTH 16 TO 20 MPH.
SMOKE DISPERSAL.....POOR (1370 M/S-M).
WEDNESDAY
SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT) THEN BECOMING
MOSTLY SUNNY (20-30 PERCENT).
CWR.................0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
TEMPERATURE.........MAX 45.
RH..................MIN 39 PERCENT.
EYE LEVEL WINDS.....WINDS AROUND 6 MPH WITH AN ADJUSTMENT FACTOR OF 0.5
WIND (20 FT)........WEST WINDS 6 TO 12 MPH.
MIXING HEIGHT.......MAX 3600 FT AGL.
TRANSPORT WINDS.....WEST 16 TO 23 MPH.
SMOKE DISPERSAL.....POOR (1730 M/S-M) EARLY IN THE MORNING
INCREASING TO GOOD MAX (11220 M/S-M) IN THE
AFTERNOON.
FORECASTER...BRITT
REQUESTED BY...RON COLATSKIE
TYPE OF REQUEST...PRESCRIBED
.TAG 2600574.0/LSX
.DELDT 01/20/26
.FORMATTERVERSION 2.0.0
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