160
FNUS73 KLSX 260908
FWSLSX
SPOT FORECAST FOR STEWART...IL DNR
NATIONAL WEATHER SERVICE SAINT LOUIS MO
408 AM CDT THU MAR 26 2026
FORECAST IS BASED ON IGNITION TIME OF 0700 CDT ON MARCH 26.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE
NATIONAL WEATHER SERVICE.
DISCUSSION
TEMPERATURES WILL WARM AGGRESSIVELY TODAY INTO THE UPPER 80S, WHILE
RELATIVE HUMIDITY VALUES WILL REACH A MINIMUM IN THE LOW 40S. THERE
IS ONLY A 30% CHANCE THAT RELATIVE HUMIDITY VALUES WILL DROP BELOW 40%
THIS AFTERNOON. MIXING WILL KICK OFF THIS MORNING AND MIX TO
1400 FT BY ROUGHLY 10AM, REACHING A MAXIMUM MIXING HEIGHT OF 4400 FT
BY 3 PM. STRONG WINDS WITHIN THE MIXED LAYER WILL ALLOW FOR EFFICIENT
SMOKE DISPERSION. SOUTHWESTERLY WINDS WILL BE STRONG AND GUSTY TODAY
AHEAD OF AN APPROACHING COLD FRONT. THE COLD FRONT WILL MOVE THROUGH
BETWEEN 10PM AND MIDNIGHT TONIGHT, CAUSING WINDS TO BECOME NORTHERLY
WHILE INCREASING IN STRENGTH. BEHIND THE COLD FRONT SHOWERS AND
THUNDERSTORMS ARE EXPECTED WITH ERRATIC WINDS, HAIL, AND FREQUENT
LIGHTNING ALL HAZARDS.
REST OF TODAY
SKY/WEATHER.........SUNNY (15-25 PERCENT).
CWR.................1 PERCENT.
CHANCE OF THUNDER...2 PERCENT.
TEMPERATURE.........62 AT IGNITION...MAX 87.
RH..................84 PERCENT AT IGNITION...MIN 41 PERCENT.
EYE LEVEL WINDS.....2-4 MPH, GUSTING UP TO 6.4MPH, USING AN ADJUSTMENT
FACTOR OF 0.2.
WIND (20 FT)........WINDS SOUTH AT 10 MPH AT IGNITION...OTHERWISE
SOUTHWEST WINDS 10 TO 18 MPH. GUSTS UP TO 32
MPH.
MIXING HEIGHT.......600 FT AGL AT IGNITION...OTHERWISE MAX 4500 FT
AGL.
TRANSPORT WINDS.....SOUTHWEST 18 TO 26 MPH INCREASING TO 28 TO 32
MPH IN THE AFTERNOON.
SMOKE DISPERSAL.....POOR /1520 M/S-M/ AT IGNITION. MAX...GOOD
/14030 M/S-M/ INCREASING TO GOOD (14470 M/S-M)
EARLY IN THE MORNING INCREASING TO EXCELLENT
MAX (19750 M/S-M) IN THE AFTERNOON LATE IN THE
AFTERNOON.
TIME (CDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM
SKY (%).........33 19 28 9 5 17 8 7 8 6 24 32
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0 80
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............62 65 69 73 77 81 84 85 87 87 86 85
RH..............84 81 73 64 58 51 48 46 42 42 42 41
20 FT WIND DIR..S SW SW SW SW SW SW SW SW SW SW SW
20 FT WIND SPD..10 11 13 14 15 16 15 16 17 18 17 13
20 FT WIND GUST.16 18 19 20 21 22 25 26 27 28 26 25
EYE LVL WND DIR.S SW SW SW SW SW SW SW SW SW SW SW
EYE LVL WND SPD.5 5 6 6 7 7 7 7 8 8 8 6
EYE LVL WND GST.7 8 9 9 10 10 12 12 12 13 12 12
MIX HGT (KFT)...0.6 0.7 1.3 1.8 2.2 2.5 3.1 3.6 4.0 4.5 3.5 1.3
TRANSP WIND DIR.SW SW SW SW SW SW SW SW SW SW SW SW
TRANSP WIND SPD.18 20 23 24 26 26 28 29 32 32 30 22
VRATE KT-FT/1K..10 12 26 37 51 59 74 89 112 126 92 24
VENTRATE CAT....PR PR PR PR FR FR GD GD VGD VGD GD PR
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY (25-35 PERCENT) THEN BECOMING
MOSTLY CLOUDY (50-60 PERCENT) THEN BECOMING
PARTLY CLOUDY (35-45 PERCENT) THEN BECOMING
MOSTLY CLOUDY (70-80 PERCENT). CHANCE OF
SHOWERS AND THUNDERSTORMS IN THE EVENING, THEN
RAIN SHOWERS WITH THUNDERSTORMS LIKELY
OVERNIGHT.
CWR.................77 PERCENT.
CHANCE OF THUNDER...58 PERCENT.
TEMPERATURE.........MIN 38.
RH..................MAX 93 PERCENT.
EYE LEVEL WINDS.....2-4MPH, GUSTING TO 6MPH, USING AN ADJUSTMENT FACTOR
OF 0.2.
WIND (20 FT)........SOUTHWEST WINDS AROUND 13 MPH DECREASING TO
AROUND 11 MPH EARLY IN THE EVENING, THEN
SHIFTING TO THE SOUTH LATE IN THE EVENING
SHIFTING TO THE WEST AROUND 13 MPH LATE IN THE
EVENING SHIFTING TO THE NORTH INCREASING TO 15
TO 18 MPH OVERNIGHT. GUSTS UP TO 30 MPH
INCREASING TO 35 MPH OVERNIGHT. GUSTY AND
ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS EARLY
IN THE EVENING. GUSTY AND ERRATIC WINDS
EXPECTED NEAR THUNDERSTORMS OVERNIGHT.
MIXING HEIGHT.......MIN 700 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 16 TO 22 MPH SHIFTING TO THE
NORTHEAST 16 TO 21 MPH LATE IN THE EVENING,
THEN INCREASING TO 28 TO 30 MPH OVERNIGHT.
SMOKE DISPERSAL.....FAIR (6800 M/S-M) EARLY IN THE EVENING
DECREASING TO POOR MIN (1560 M/S-M) LATE IN THE
NIGHT.
FORECASTER...DELIA
REQUESTED BY...WADE BLOEMER
TYPE OF REQUEST...PRESCRIBED
.TAG 2607907.0/LSX
.DELDT 03/25/26
.FORMATTERVERSION 2.0.0
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