157
FNUS73 KLSX 221252
FWSLSX

Spot Forecast for Mark Twain Lake...Army Corps of Engineers
National Weather Service Saint Louis MO
752 AM CDT Wed Apr 22 2026

Forecast is based on ignition time of 0800 CDT on April 22.
If conditions become unrepresentative, contact the
National Weather Service.

.DISCUSSION...
It will be cloudy this morning and early this afternoon.  Clouds may
break up as early as 200-300 PM, however there is a chance the
clouds could linger.  Southwest winds around 10 mph will prevail today with
gusts up to 15 to 20 mph late this morning into the early afternoon. Mixing
heights are not expected to rise above 1700 feet until at least 1000-1100 AM
and will not rise to the max of 3500 feet until the clouds break up later
this afternoon.

.REST OF TODAY...

Sky/weather.........Cloudy (85-95 percent) then becoming mostly
                    sunny late this afternoon (30-40 percent).
CWR.................0 percent.
Chance of thunder...0 percent.
Temperature.........59 at ignition...Max 72.
RH..................83 percent at ignition...Min 61 percent.
Eye level winds.....Southwest around 4 mph.
Wind (20 ft)........Winds west at 9 mph at ignition...otherwise
                    Southwest winds 6 to 9 mph. Gusts up to 20 mph
                    late in the morning then 20 mph early in the
                    afternoon.
Mixing height.......1400 ft AGL at ignition...otherwise max 3400 ft
                    AGL.
Transport winds.....Southwest 15 to 18 mph.
Smoke dispersal.....Poor /3490 m/s-m/ at ignition. Max...fair /7560
                    m/s-m/.

TIME (CDT)      8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM
Sky (%).........100 100 97  99  75  75  60  40  34  38  37  39
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0   0   0   0   0   0   0
Chc of thdr (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............59  60  61  62  64  67  68  69  70  72  72  72
RH..............83  84  84  84  81  75  73  70  68  61  61  61
20 FT wind dir..W   SW  SW  SW  SW  SW  SW  SW  SW  SW  SW  SW
20 FT wind spd..9   9   8   8   8   8   8   8   8   6   5   5
20 FT wind gust.15  17  17  17  16  17  16  16  15  15  13  12
Eye lvl wnd dir.W   SW  SW  SW  SW  SW  SW  SW  SW  SW  SW  SW
Eye lvl wnd spd.4   4   4   4   4   4   4   4   4   3   2   2
Eye lvl wnd gst.7   8   8   8   7   8   7   7   7   7   6   6
Mix hgt (kft)...1.4 2.0 2.3 2.4 2.6 2.7 3.2 3.4 3.4 3.3 3.2 1.5
Transp wind dir.W   W   W   W   W   SW  SW  SW  SW  SW  SW  SW
Transp wind spd.18  18  16  17  15  16  16  16  15  15  16  14
Vrate kt-ft/1K..22  33  32  36  34  38  45  48  44  43  45  18
Ventrate Cat....PR  PR  PR  PR  PR  PR  FR  FR  FR  FR  FR  PR

$$
Forecaster...Carney
Requested by...Nicholas Allen
Type of request...PRESCRIBED
.TAG 2611294.0/LSX
.DELDT 04/22/26
.FormatterVersion 2.0.0