631
FNUS73 KLSX 281057
FWSLSX
SPOT FORECAST FOR TP UNIT...MISSOURI DEPARTMENT OF CONSERVATION
NATIONAL WEATHER SERVICE SAINT LOUIS MO
457 AM CST SAT FEB 28 2026
FORECAST IS BASED ON IGNITION TIME OF 1000 CST ON FEBRUARY 28.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE
NATIONAL WEATHER SERVICE.
DISCUSSION
TODAY'S WIND AND HUMIDITY FORECAST WILL BE CHALLENGING, AS A LOW
PRESSURE SYSTEM WILL CAUSE WINDS TO SHIFT CONSTANTLY THROUGHOUT
THE BURN PERIOD. WINDS WILL LIKELY BEGIN THE DAY OUT OF THE EAST,
THEN GRADUALLY SHIFT TO THE SOUTH, AND THEN SOUTHWEST BY MID TO
LATE AFTERNOON. WHILE SPEEDS ARE EXPECTED TO BE MOSTLY LIGHT, SOME
STRONGER GUSTS WILL BE POSSIBLE, PARTICULARLY IN THE AFTERNOON
WHEN THE SOUTHWESTERLIES ARRIVE. HUMIDITY IS ALSO EXPECTED TO BE
RELATIVELY LOW, BUT NOT AS LOW AS YESTERDAY. IN SPITE OF THE
LINGERING DRY AIR, A FEW VERY LIGHT SHOWERS OR SPRINKLES MAY REACH
THE SURFACE DURING THE DAY, BUT LIKELY NOT ENOUGH TO ACCUMULATE.
IF RAIN DOES REACH THE SURFACE, HUMIDITY IS LIKELY TO REMAIN
SLIGHTLY HIGHER THAN THE FORECAST BELOW. PERSISTENT CLOUD COVER
MAY ALSO LIMIT MIXING AND INHIBIT SMOKE DISPERSION, WHICH WILL
LIKELY BE CHALLENGING ALREADY DUE TO THE SHIFTING WINDS.
THIS EVENING, A COLD FRONT WILL PUSH THROUGH THE AREA AND SWITCH
WINDS TO THE NORTH. WINDS WILL REMAIN NORTHERLY THROUGH THE NIGHT
AND GRADUALLY BECOME NORTHEASTERLY TOMORROW MORNING. MUCH COOLER
TEMPERATURES ARE EXPECTED TOMORROW, BUT HUMIDITY WILL REMAIN
RELATIVELY LOW UNTIL WIDESPREAD LIGHT RAIN AND POSSIBLY SOME SNOW
ARRIVE OVERNIGHT TOMORROW.
REST OF TODAY
SKY/WEATHER.........MOSTLY SUNNY (40-50 PERCENT) THEN BECOMING
MOSTLY CLOUDY (70-80 PERCENT). SLIGHT CHANCE OF
RAIN IN THE LATE MORNING AND AFTERNOON, THEN
CHANCE OF RAIN LATE IN THE AFTERNOON.
CWR.................4 PERCENT.
CHANCE OF THUNDER...7 PERCENT.
TEMPERATURE.........54 AT IGNITION...MAX 69.
RH..................44 PERCENT AT IGNITION...MIN 33 PERCENT.
EYE LEVEL WINDS.....HIGHLY VARIABLE WIND DIRECTION THROUGH THE DAY.
EAST 1 TO 3 MPH AT IGNITION, GRADUALLY SHIFTING TO
SOUTH, THEN SOUTHWEST BY 2 PM. MAXIMUM SPEEDS
2 TO 4 MPH SUSTAINED WITH GUSTS TO 8 MPH BETWEEN 2 AND 5 PM.
WIND (20 FT)........HIGHLY VARIABLE WIND DIRECTION THROUGH THE DAY.
EAST 4 TO 7 MPH AT IGNITION, GRADUALLY SHIFTING TO
SOUTH, THEN SOUTHWEST BY 2 PM. MAXIMUM SPEEDS
5 TO 9 MPH SUSTAINED WITH GUSTS TO 18 MPH BETWEEN 2 AND 5 PM.
MIXING HEIGHT.......1300 FT AGL AT IGNITION...OTHERWISE MAX 2400 FT
AGL.
TRANSPORT WINDS.....SOUTHEAST AROUND 13 MPH SHIFTING TO THE SOUTH 9
TO 16 MPH IN THE AFTERNOON.
SMOKE DISPERSAL.....POOR /2230 M/S-M/ AT IGNITION. MAX...MARGINAL
/5070 M/S-M/.
TIME (CST) 10 AM NOON 2 PM 4 PM 6 PM 8 PM
SKY (%).........39 39 58 73 57 57
WEATHER COV.....S CHC S CHC S CHC S CHC S CHC
WEATHER TYPE....RAIN RAIN RAIN RAIN RAIN NONE
TSTM COV........
CWR.............0 0 0 0 0 0
CHC OF THDR (%).0 10 10 10 10 10
TEMP............54 61 67 69 63 58
RH..............44 38 34 33 44 53
20 FT WIND......E 6 SE 7 S 7 S 6 SW 6 SW 7
20 FT WIND GUST.13 14 15 14 13 15
EYE LEVEL WIND..E 3 SE 3 S 3 S 3 SW 3 SW 3
EYE LVL WND GST.6 6 7 6 6 7
MIX HGT (KFT)...1.3 2.1 2.3 1.6 0.2 0.4
TRANSPORT WIND..SE 13 S 15 S 16 SW 14 SW 9 SW 10
VRATE KT-FT/1K..14 27 32 19 2 3
VENTRATE CAT....POOR POOR POOR POOR POOR POOR
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY (55-65 PERCENT) THEN BECOMING
PARTLY CLOUDY (25-35 PERCENT). SLIGHT CHANCE OF
RAIN EARLY IN THE EVENING.
CWR.................4 PERCENT.
CHANCE OF THUNDER...8 PERCENT.
TEMPERATURE.........MIN 31.
RH..................MAX 75 PERCENT.
EYE LEVEL WINDS.....NORTH 1 TO 3 MPH.
WIND (20 FT)........NORTH 4 TO 8 MPH.
MIXING HEIGHT.......MIN 200 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 9 TO 10 MPH SHIFTING TO THE NORTH 14
TO 16 MPH IN THE LATE EVENING AND OVERNIGHT.
SMOKE DISPERSAL.....POOR (240 M/S-M).
SUNDAY
SKY/WEATHER.........PARTLY SUNNY (55-65 PERCENT) THEN BECOMING
CLOUDY (85-95 PERCENT). SLIGHT CHANCE OF SNOW
EARLY IN THE AFTERNOON. SLIGHT CHANCE OF RAIN
IN THE AFTERNOON.
CWR.................7 PERCENT.
CHANCE OF THUNDER...1 PERCENT.
TEMPERATURE.........MAX 46.
RH..................MIN 42 PERCENT.
EYE LEVEL WINDS.....NORTHEAST 2 TO 4 MPH.
WIND (20 FT)........NORTHEAST 5 TO 9 MPH.
MIXING HEIGHT.......MAX 2400 FT AGL.
TRANSPORT WINDS.....NORTHEAST 14 TO 16 MPH.
SMOKE DISPERSAL.....POOR (2440 M/S-M) EARLY IN THE MORNING
INCREASING TO MARGINAL MAX (4890 M/S-M) IN THE
AFTERNOON.
FORECASTER...19
REQUESTED BY...DAVID SHIEH
TYPE OF REQUEST...PRESCRIBED
.TAG 2604295.0/LSX
.DELDT 02/28/26
.FORMATTERVERSION 2.0.0
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