837
FNUS73 KLSX 071903
FWSLSX
SPOT FORECAST FOR MARK TWAIN LAKE...U.S. ARMY CORPS OF ENGINEERS
NATIONAL WEATHER SERVICE SAINT LOUIS MO
203 PM CDT TUE APR 7 2026
FORECAST IS BASED ON IGNITION TIME OF 0000 CDT ON APRIL 09.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE
NATIONAL WEATHER SERVICE.
DISCUSSION
A COLD FRONT WILL BE STALLED ACROSS THE REGION THURSDAY. WHILE IT'S
EXACT LOCATION IS UNCERTAIN IT'S MOST LIKELY TO BE AROUND THE MISSOURI-
IOWA BORDER. SOUTH OF THE FRONT SOUTHWESTERLY WINDS AND TEMPERATURES
IN THE LOW 70S WILL PREVAIL, THOUGH IMMEDIATELY AROUND MARK TWAIN LAKE
TEMPERATURES MAYBE STUNTED A FEW DEGREES WITH HIGHS IN THE UPPER 60S.
RH VALUES WILL REACH THEIR MINIMUM IN THE LOW TO MID 50S DURING THE
AFTERNOON. MIXING TO THE SOUTH OF THE FRONT WILL ALLOW FOR THE MIXING
HEIGHT TO EXCEED 1,400 FT BY NOON AND REACH THE FULL MIXING HEIGHT OF
2,500-3,000 FT BY 3-4 PM. HOWEVER, WINDS WITHIN THE MIXED LAYER ARE
EXPECTED TO BE LIGHT (LESS THAN 8 KTS), RESULTING IN POOR SMOKE
DISPERSION.
THURSDAY
SKY/WEATHER.........PARTLY CLOUDY (40-50 PERCENT). CHANCE OF
RAIN SHOWERS OVERNIGHT.
CWR.................6 PERCENT.
CHANCE OF THUNDER...10 PERCENT.
TEMPERATURE.........58 AT IGNITION...MIN 53.
RH..................64 PERCENT AT IGNITION...MAX 77 PERCENT.
EYE LEVEL WINDS.....1-2 MPH, GUSTING TO 5 MPH, USING AN ADJUSTMENT
FACTOR OF 0.3.
WIND (20 FT)........WINDS SOUTH AT 7 MPH AT IGNITION...OTHERWISE
SOUTHWEST WINDS 5 TO 7 MPH WITH GUSTS TO AROUND
17 MPH, OVERNIGHT BECOMING LIGHT.
MIXING HEIGHT.......600 FT AGL AT IGNITION...OTHERWISE MIN 600 FT
AGL.
TRANSPORT WINDS.....SOUTHWEST 14 TO 18 MPH.
SMOKE DISPERSAL.....POOR /1560 M/S-M/ AT IGNITION. MIN...POOR /1160
M/S-M/.
TIME (CDT) MID 1AM 2AM 3AM 4AM 5AM 6AM 7AM 8AM 9AM 10A 11A
SKY (%).........45 61 58 54 51 50 49 48 46 43 41 43
WEATHER COV.....SCH CHC CHC CHC CHC CHC CHC
WEATHER TYPE....RW RW RW RW RW RW RW
TSTM COV........
CWR.............10 10 10 10 10 10 10 10 10 10 10 10
CHC OF THDR (%).10 10 10 10 10 10 10 10 10 10 10 10
TEMP............58 58 58 57 56 55 54 53 55 57 60 63
RH..............64 64 64 67 69 72 74 77 74 75 69 65
20 FT WIND DIR..S S S SW SW SW SW SW SW SW SW SW
20 FT WIND SPD..7 7 6 6 5 4 4 4 4 5 5 5
20 FT WIND GUST.17 17 17 16 15 14 12 11 11 11 12 12
EYE LVL WND DIR.S S S SW SW SW SW SW SW SW SW SW
EYE LVL WND SPD.3 3 3 3 2 2 2 2 2 2 2 2
EYE LVL WND GST.8 8 8 7 7 6 6 5 5 5 6 6
MIX HGT (KFT)...0.6 0.7 0.6 0.6 0.6 0.6 0.6 0.6 0.9 1.2 1.5 2.2
TRANSP WIND DIR.SW SW SW SW SW SW SW SW SW W W W
TRANSP WIND SPD.18 17 17 17 16 14 13 10 9 9 9 9
VRATE KT-FT/1K..10 10 10 10 9 7 7 5 7 10 12 18
VENTRATE CAT....PR PR PR PR PR PR PR PR PR PR PR PR
FORECASTER...DELIA
REQUESTED BY...NICHOLAS ALLEN
TYPE OF REQUEST...PRESCRIBED
.TAG 2609389.0/LSX
.DELDT 04/07/26
.FORMATTERVERSION 2.0.0
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