245
FNUS73 KLSX 201251
FWSLSX
SPOT FORECAST FOR SOUTH SHORE RX...IDNR
NATIONAL WEATHER SERVICE SAINT LOUIS MO
651 AM CST TUE JAN 20 2026
FORECAST IS BASED ON IGNITION TIME OF 1000 CST ON JANUARY 20.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE
NATIONAL WEATHER SERVICE.
DISCUSSION
HIGH TEMPERATURES WILL BE JUST ABOVE NORMAL TODAY WITH MINIMUM RELATIVE
HUMIDITY VALUES BETWEEN 35 AND 40 PERCENT. MIXING HEIGHTS WILL CLIMB ABOVE
1700 FEET AROUND 11 AM, WITH THE MAXIMUM MIXING HEIGHT AROUND 2800 FEET
THIS AFTERNOON RESULTING IN GOOD SMOKE DISPERSAL. WINDS WILL BE OUT OF
THE SOUTH DURING THE DAY TODAY AT 12 MPH OR LESS.
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 TO AROUND TO 3400 FEET WITH GOOD
SMOKE DISPERSION IN THE AFTERNOON WITH MINIMUM RELATIVE HUMIDITY VALUES
AROUND 40 PERCENT.
REST OF TODAY
SKY/WEATHER.........MOSTLY SUNNY (40-50 PERCENT).
CWR.................0 PERCENT.
TEMPERATURE.........19 AT IGNITION...MAX 33.
RH..................51 PERCENT AT IGNITION...MIN 37 PERCENT.
EYE LEVEL WINDS.....WINDS AROUND 4 MPH WITH AN ADJUSTMENT FACTOR OF 0.3
WIND (20 FT)........WINDS SOUTH AT 7 MPH AT IGNITION...OTHERWISE
SOUTH WINDS 7 TO 12 MPH.
MIXING HEIGHT.......1300 FT AGL AT IGNITION...OTHERWISE MAX 2800 FT
AGL.
TRANSPORT WINDS.....SOUTH 10 TO 15 MPH INCREASING TO 17 TO 23 MPH
IN THE AFTERNOON.
SMOKE DISPERSAL.....POOR /1820 M/S-M/ AT IGNITION. MAX...GOOD /8660
M/S-M/.
TIME (CST) 10 AM NOON 2 PM 4 PM 6 PM 8 PM
SKY (%).........63 44 36 26 29 33
WEATHER COV.....
WEATHER TYPE....NONE NONE NONE NONE NONE NONE
TSTM COV........
CWR.............0 0 0 0 0 0
TEMP............19 27 31 33 29 27
RH..............51 38 37 39 46 50
20 FT WIND......S 7 S 10 S 11 S 11 S 10 S 12
20 FT WIND GUST.10 14 17 16 16 19
EYE LEVEL WIND..S 3 S 5 S 5 S 5 S 5 S 6
EYE LVL WND GST.5 6 8 7 7 9
MIX HGT (KFT)...1.3 2.4 2.7 1.9 0.7 0.7
TRANSPORT WIND..S 10 S 20 S 22 S 21 S 18 S 21
VRATE KT-FT/1K..12 42 51 34 11 12
VENTRATE CAT....POOR FAIR FAIR POOR POOR POOR
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY (30-40 PERCENT) THEN BECOMING
MOSTLY CLOUDY (70-80 PERCENT).
CWR.................10 PERCENT.
TEMPERATURE.........MIN 26.
RH..................MAX 82 PERCENT.
EYE LEVEL WINDS.....WINDS AROUND 5 MPH WITH AN ADJUSTMENT FACTOR OF 0.3
WIND (20 FT)........SOUTH WINDS 10 TO 15 MPH. GUSTS UP TO 26 MPH.
MIXING HEIGHT.......MIN 700 FT AGL.
TRANSPORT WINDS.....SOUTH 18 TO 22 MPH.
SMOKE DISPERSAL.....POOR (1650 M/S-M).
WEDNESDAY
SKY/WEATHER.........CLOUDY (90-100 PERCENT) THEN BECOMING MOSTLY
SUNNY (35-45 PERCENT).
CWR.................10 PERCENT.
TEMPERATURE.........MAX 45.
RH..................MIN 51 PERCENT.
EYE LEVEL WINDS.....WINDS AROUND 5 MPH WITH AN ADJUSTMENT FACTOR OF 0.3
WIND (20 FT)........SOUTHWEST WINDS AROUND 15 MPH SHIFTING TO THE
WEST 6 TO 11 MPH LATE IN THE AFTERNOON.
MIXING HEIGHT.......MAX 3400 FT AGL.
TRANSPORT WINDS.....WEST 16 TO 25 MPH.
SMOKE DISPERSAL.....POOR (2890 M/S-M) EARLY IN THE MORNING
INCREASING TO GOOD MAX (11800 M/S-M) IN THE
AFTERNOON.
FORECASTER...BRITT
REQUESTED BY...BLAKE BAUM
TYPE OF REQUEST...PRESCRIBED
.TAG 2600559.0/LSX
.DELDT 01/20/26
.FORMATTERVERSION 2.0.0
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