242
FNUS73 KLSX 201216
FWSLSX
SPOT FORECAST FOR PLANK HOLLOW RXB...MISSOURI DEPT OF CONSERVATION
NATIONAL WEATHER SERVICE SAINT LOUIS MO
616 AM CST TUE JAN 20 2026
FORECAST IS BASED ON IGNITION TIME OF 0800 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 AROUND 30 PERCENT. MIXING HEIGHTS WILL CLIMB ABOVE
1700 FEET UNTIL BETWEEN 11 AM AND NOON, WITH THE MAXIMUM MIXING HEIGHT
AROUND 2500 FEET THIS AFTERNOON RESULTING IN FAIR SMOKE DISPERSAL.
WINDS WILL BE OUT OF THE SOUTH DURING THE DAY TODAY AT 5 TO 8 MPH
WITH HIGHER GUSTS.
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 WEST AND BECOMING GUSTY.
MIXING HEIGHTS ARE EXPECTED TO CLIMB TO AROUND TO 2900 FEET WITH GOOD
SMOKE DISPERSION IN THE AFTERNOON WITH MINIMUM RELATIVE HUMIDITY VALUES
AROUND 40 PERCENT.
REST OF TODAY
SKY/WEATHER.........MOSTLY SUNNY (20-30 PERCENT).
TEMPERATURE.........12 AT IGNITION...MAX 41.
RH..................59 PERCENT AT IGNITION...MIN 30 PERCENT.
EYE LEVEL WINDS.....WINDS AROUND 2 MPH WITH AN ADJUSTMENT FACTOR OF 0.2
WIND (20 FT)........WINDS SOUTH AT 4 MPH AT IGNITION...OTHERWISE
LIGHT WINDS BECOMING SOUTH 5 TO 8 MPH WITH
GUSTS TO AROUND 17 MPH IN THE LATE MORNING AND
AFTERNOON.
MIXING HEIGHT.......300 FT AGL AT IGNITION...OTHERWISE MAX 2500 FT
AGL.
TRANSPORT WINDS.....SOUTH 9 TO 18 MPH INCREASING TO 16 TO 22 MPH
LATE IN THE MORNING.
SMOKE DISPERSAL.....POOR /460 M/S-M/ AT IGNITION. MAX...FAIR /7600
M/S-M/.
TIME (CST) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM
SKY (%).........48 39 23 14 8 5 3 4 5 5 7 9
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
TEMP............12 18 23 29 34 37 40 40 40 38 35 33
RH..............59 50 43 37 33 31 30 30 30 32 36 36
20 FT WIND DIR..S S S S S S S S S S S S
20 FT WIND SPD..4 5 6 7 8 8 8 8 8 7 8 9
20 FT WIND GUST.10 12 13 14 16 16 17 17 17 17 17 19
EYE LVL WND DIR.S S S S S S S S S S S S
EYE LVL WND SPD.2 2 3 3 4 4 4 4 4 3 4 4
EYE LVL WND GST.5 6 6 6 7 7 8 8 8 8 8 9
MIX HGT (KFT)...0.3 0.6 1.1 1.5 1.9 2.1 2.4 2.5 1.9 0.6 0.5 0.5
TRANSP WIND DIR.S S S S S S S SW S S S S
TRANSP WIND SPD.9 13 18 20 21 21 21 22 21 16 18 20
VRATE KT-FT/1K..3 7 19 27 35 39 43 48 35 9 9 9
VENTRATE CAT....PR PR PR PR PR PR FR FR PR PR PR PR
TONIGHT
SKY/WEATHER.........MOSTLY CLEAR (20-30 PERCENT) THEN BECOMING
MOSTLY CLOUDY (65-75 PERCENT).
TEMPERATURE.........MIN 28.
RH..................MAX 88 PERCENT.
EYE LEVEL WINDS.....WINDS AROUND 2 MPH WITH AN ADJUSTMENT FACTOR OF 0.2
WIND (20 FT)........SOUTH WINDS 7 TO 10 MPH WITH GUSTS TO AROUND 22
MPH.
MIXING HEIGHT.......MIN 500 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 18 TO 22 MPH.
SMOKE DISPERSAL.....POOR (1260 M/S-M).
WEDNESDAY
SKY/WEATHER.........PARTLY SUNNY (50-60 PERCENT) THEN BECOMING
SUNNY (10-20 PERCENT).
TEMPERATURE.........MAX 47.
RH..................MIN 40 PERCENT.
EYE LEVEL WINDS.....WINDS AROUND 1 MPH WITH AN ADJUSTMENT FACTOR OF 0.2
WIND (20 FT)........WEST WINDS 5 TO 6 MPH WITH GUSTS TO AROUND 18
MPH IN THE MORNING AND EARLY AFTERNOON BECOMING
LIGHT.
MIXING HEIGHT.......MAX 2900 FT AGL.
TRANSPORT WINDS.....WEST 14 TO 22 MPH.
SMOKE DISPERSAL.....POOR (1790 M/S-M) EARLY IN THE MORNING
INCREASING TO GOOD MAX (8370 M/S-M) IN THE
AFTERNOON.
FORECASTER...BRITT
REQUESTED BY...MATTHEW PETER
TYPE OF REQUEST...PRESCRIBED
.TAG 2600498.0/LSX
.DELDT 01/20/26
.FORMATTERVERSION 2.0.0
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