152  
FNUS73 KLSX 091206  
FWSLSX  
 
SPOT FORECAST FOR MARK TWAIN LAKE...USACE  
NATIONAL WEATHER SERVICE SAINT LOUIS MO  
706 AM CDT THU OCT 9 2025  
 
FORECAST IS BASED ON IGNITION TIME OF 1200 CDT ON OCTOBER 09.  
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE  
NATIONAL WEATHER SERVICE.  
   
DISCUSSION  
 
DRY CONDITIONS AND NEAR NORMAL TEMPERATURES ARE EXPECTED TODAY  
WITH HIGHS AROUND 70, SIMILAR TO YESTERDAY. EYE LEVEL WINDS  
WILL BE LESS THAN 5 MPH THROUGHOUT THE DAY. MINIMUM RELATIVE  
HUMIDITY VALUES WILL DROP TO AROUND 35 PERCENT.  
 
MIXING HEIGHTS WILL BE AROUND 3000 FEET AGL AT IGNITION AND  
AROUND 4500 FEET AGL BY 3-4 PM. EVEN WITH DECENT MIXING, WEAK  
WINDS WILL CAUSE POOR SMOKE DISPERSAL THROUGHOUT THE DAY.  
 
   
REST OF TODAY  
 
SKY/WEATHER.........SUNNY (0-10 PERCENT).  
CWR.................0 PERCENT.  
CHANCE OF THUNDER...0 PERCENT.  
TEMPERATURE.........65 AT IGNITION...MAX 71.  
RH..................48 PERCENT AT IGNITION...MIN 38 PERCENT.  
WIND (20 FT)........WINDS SOUTHEAST AT 5 MPH AT  
IGNITION...OTHERWISE SOUTHEAST WINDS AROUND 5  
MPH.  
MIXING HEIGHT.......2900 FT AGL AT IGNITION...OTHERWISE MAX 4600 FT  
AGL.  
TRANSPORT WINDS.....SOUTHEAST 6 TO 7 MPH.  
SMOKE DISPERSAL.....POOR /2700 M/S-M/ AT IGNITION. MAX...POOR /3650  
M/S-M/.  
 
TIME (CDT) NOON 2 PM 4 PM 6 PM 8 PM 10 PM  
SKY (%).........1 2 3 2 4 4  
WEATHER COV.....  
WEATHER TYPE....NONE NONE NONE NONE NONE NONE  
TSTM COV........  
CWR.............0 0 0 0 0 0  
CHC OF THDR (%).0 0 0 0 0 0  
TEMP............65 69 71 67 60 54  
RH..............48 42 38 45 60 71  
20 FT WIND......SE 5 SE 5 SE 5 SE 5 SE 5 SE 5  
20 FT WIND GUST.10 10 10 9 8 9  
MIX HGT (KFT)...2.9 4.6 4.6 1.0 0.4 0.4  
TRANSPORT WIND..SE 7 SE 6 SE 6 SE 7 SE 9 SE 9  
VRATE KT-FT/1K..17 23 23 6 3 3  
VENTRATE CAT....POOR POOR POOR POOR POOR POOR  
 
 
FORECASTER...BRITT  
REQUESTED BY...AARON ECKELKAMP  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2523223.0/LSX  
.DELDT 10/09/25  
.FORMATTERVERSION 2.0.0  
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