859
FNUS73 KLSX 201409
FWSLSX

Spot Forecast for Logan Unit A...Missouri Dept. Conservation
National Weather Service Saint Louis MO
809 AM CST Tue Jan 20 2026

Forecast is based on ignition time of 1100 CST on January 20.
If conditions become unrepresentative, contact the
National Weather Service.

.DISCUSSION...
Temperatures will warm from the teens and into the mid 30s by the
afternoon with light southerly flow increasing in magnitude
throughout the day. Winds will continue to increase in strength
this evening and into tonight ahead of an approaching cold front
to the west. This cold front is forecasted to move through around
sunrise tomorrow bringing only a gradual wind shift from southerly
to the west while the wind speeds will remain the same behind the
front on Wednesday. Minimum relative humidity values are
forecasted to drop to around 35 percent this afternoon with
slightly higher values around 40 percent Wednesday afternoon. The
lower to mid-level clouds currently over the area may slowly break
this afternoon before more mid-level clouds move in tonight into
Wednesday morning. There are no chances for precipitation now
through Wednesday.


.REST OF TODAY...

Sky/weather.........Mostly sunny (35-45 percent).
CWR.................10 percent.
Chance of thunder...0 percent.
Temperature.........25 at ignition...Max 37.
RH..................46 percent at ignition...Min 40 percent.
Eye level winds.....Winds south at 5 mph or less at ignition...otherwise
                    South winds 5 mph. Adjustment factor of 0.3 used.
Wind (20 ft)........Winds south at 7 mph at ignition...otherwise
                    South winds 6 to 8 mph.
Mixing height.......1700 ft AGL at ignition...otherwise max 2900 ft
                    AGL.
Transport winds.....South 13 to 21 mph.
Smoke dispersal.....Poor /4290 m/s-m/ at ignition. Max...good /8310
                    m/s-m/.

TIME (CST)      11 AM  1 PM   3 PM   5 PM   7 PM   9 PM
Sky (%).........48     36     28     32     42     48
Weather cov.....
Weather type....NONE   NONE   NONE   NONE   NONE   NONE
Tstm cov........
CWR.............10     0      0      0      0      0
Chc of thdr (%).0      0      0      0      0      0
Temp............25     32     36     34     30     30
RH..............46     41     42     49     55     51
20 ft wind......S 7    SW 8   S 8    S 6    S 7    S 9
20 ft wind gust.13     14     15     12     14     19
Eye level wind..S 3    SW 4   S 4    S 3    S 3    S 4
Eye lvl wnd gst.6      6      7      6      6      9
Mix hgt (kft)...1.7    2.4    2.9    0.6    0.5    0.7
Transport wind..S 18   SW 18  S 21   S 13   S 17   S 18
Vrate kt-ft/1K..27     38     53     6      8      12
Ventrate Cat....POOR   POOR   FAIR   POOR   POOR   POOR

.TONIGHT...

Sky/weather.........Partly cloudy (40-50 percent) then becoming
                    mostly cloudy (65-75 percent).
CWR.................10 percent.
Chance of thunder...0 percent.
Temperature.........Min 27.
RH..................Max 81 percent.
Eye level winds.....Southwest winds 5 mph or less with gusts to
                    around 7 mph. Adjustment factor of 0.3 used.
Wind (20 ft)........Southwest winds 7 to 10 mph with gusts to
                    around 21 mph.
Mixing height.......Min 500 ft AGL.
Transport winds.....Southwest 15 to 20 mph shifting to the west
                    around 18 mph early in the morning.
Smoke dispersal.....Poor (960 m/s-m).

.WEDNESDAY...

Sky/weather.........Mostly sunny (25-35 percent).
CWR.................0 percent.
Chance of thunder...0 percent.
Temperature.........Max 40.
RH..................Min 46 percent.
Eye level winds.....West winds 5 mph. Gusts up to 8 mph in
                    the morning and early afternoon. Adjustment
factor of 0.3 used.
Wind (20 ft)........West winds 6 to 9 mph. Gusts up to 23 mph in
                    the morning and early afternoon.
Mixing height.......Max 3100 ft AGL.
Transport winds.....West 17 to 24 mph.
Smoke dispersal.....Poor (1850 m/s-m) early in the morning
                    increasing to good max (10390 m/s-m) in the
                    afternoon.

$$
Forecaster...Peine/Elmore
Requested by...Nick LeMaster
Type of request...PRESCRIBED
.TAG 2600604.0/LSX
.DELDT 01/20/26
.FormatterVersion 2.0.0