624
FNUS73 KLSX 041300
FWSLSX

Spot Forecast for Mark Twain Lake...U.S. Army Corps of Engineers
National Weather Service Saint Louis MO
700 AM CST Tue Nov 4 2025

Forecast is based on ignition time of 1200 CST on November 04.
If conditions become unrepresentative, contact the
National Weather Service.

.DISCUSSION...

By noon, the morning inversion will be mostly broken with mixing
heights steady climbing to around 2500 - 3000 ft by 3pm. Southerly
winds will be dominant this afternoon. Expect gusts up to 20 to 25
mph. Today`s relative humidity values will bottom near 40% between
1pm and 4pm. However, if mixing is more efficient than forecast,
this value may decrease. If it does decrease, it will likely not
fall enough to cause any elevated fire concerns.

.REST OF TODAY...

Sky/weather.........Sunny (0-10 percent).
CWR.................0 percent.
Chance of thunder...0 percent.
Temperature.........68 at ignition...Max 72.
RH..................47 percent at ignition...Min 41 percent.
Eye level winds.....Winds south at 4 mph at ignition...otherwise
     South winds 4 to 5 mph with gusts to around
8 mph.
Wind (20 ft)........Winds south at 10 mph at ignition...otherwise
                    South winds 10 to 12 mph with gusts to around
                    21 mph.
Mixing height.......2500 ft AGL at ignition...otherwise max 3100 ft
                    AGL.
Transport winds.....South 16 to 25 mph.
Smoke dispersal.....Fair /7050 m/s-m/ at ignition. Max...good
                    /10720 m/s-m/.

TIME (CST)      NOON   2 PM   4 PM   6 PM   8 PM   10 PM
Sky (%).........3      7      3      11     18     25
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............68     71     71     65     62     60
RH..............47     42     44     56     62     67
20 ft wind......S 10   S 12   S 11   S 8    SW 10  SW 10
20 ft wind gust.20     21     21     19     20     21
Eye level wind..S 5    S 6    S 5    S 4    SW 5   SW 5
Eye lvl wnd gst.9      10     10     9      9      10
Mix hgt (kft)...2.5    3.1    1.1    0.4    0.4    0.5
Transport wind..S 21   S 24   S 18   S 17   SW 20  SW 20
Vrate kt-ft/1K..45     65     18     7      7      8
Ventrate Cat....FAIR   GOOD   POOR   POOR   POOR   POOR

$$
Forecaster...Jaja
Requested by...Aaron Eckelkamp
Type of request...PRESCRIBED
.TAG 2525048.0/LSX
.DELDT 11/04/25
.FormatterVersion 2.0.0