555
FNUS73 KLSX 280859
FWSLSX

Spot Forecast for River Round Unit 2...Missouri Department of Conservation
National Weather Service Saint Louis MO
359 AM CDT Wed Oct 28 2026

Forecast is based on ignition time of 1100 CDT on October 28.
If conditions become unrepresentative, contact the
National Weather Service.

.DISCUSSION...
Warmer temperatures are forecast today and Thursday ahead of a
cold front. Light southerly winds are expected ahead of this
front, with winds becoming light/variable as the boundary stalls
out. Relative humidity values today are expected to drop into the
40-45 percent range, with minimum values closer to 50-55 percent
Thursday.

.REST OF TODAY...

Sky/weather.........Sunny (0-10 percent).
CWR.................0 percent.
Chance of thunder...1 percent.
Temperature.........70 at ignition...Max 79.
RH..................63 percent at ignition...Min 44 percent.
Eye level winds.....Winds south around 2 mph using an adjustment
                    factor of 0.3.
Wind (20 ft)........Winds south at 3 mph at ignition...otherwise
                    Light winds becoming south around 5 mph late in
                    the afternoon, then becoming light late in the
                    afternoon.
Mixing height.......1700 ft AGL at ignition...otherwise max 4900 ft
                    AGL.
Transport winds.....South 9 to 14 mph.
Smoke dispersal.....Poor /2120 m/s-m/ at ignition. Max...good /9320
                    m/s-m/.

TIME (CDT)      11 AM  1 PM   3 PM   5 PM   7 PM   9 PM
Sky (%).........5      5      5      0      3      2
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............70     77     79     77     66     61
RH..............63     48     44     47     68     78
20 ft wind......S 3    S 4    S 5    S 4    S 3    S 3
20 ft wind gust.9      11     11     10     10     10
Eye level wind..S 1    S 2    S 2    S 2    S 1    S 1
Eye lvl wnd gst.4      5      5      5      5      5
Mix hgt (kft)...1.7    4.8    4.9    2.0    0.4    0.4
Transport wind..S 9    S 12   S 14   S 12   S 10   S 12
Vrate kt-ft/1K..14     48     59     20     4      4
Ventrate Cat....POOR   FAIR   FAIR   POOR   POOR   POOR

.TONIGHT...

Sky/weather.........Mostly clear (0-10 percent).
CWR.................0 percent.
Chance of thunder...1 percent.
Temperature.........Min 52.
RH..................Max 87 percent.
Eye level winds.....Light/variable using an adjustment facot of 0.3.
Wind (20 ft)........Light winds.
Mixing height.......Min 400 ft AGL.
Transport winds.....South 10 to 12 mph.
Smoke dispersal.....Poor (600 m/s-m).

.THURSDAY...

Sky/weather.........Sunny (5-15 percent).
CWR.................2 percent.
Chance of thunder...6 percent.
Temperature.........Max 82.
RH..................Min 53 percent.
Eye level winds.....Light/variable using an adjustment facot of 0.3.
Wind (20 ft)........Light winds.
Mixing height.......Max 5200 ft AGL.
Transport winds.....Southwest 9 to 12 mph shifting to the west
                    around 6 mph late in the afternoon.
Smoke dispersal.....Poor (600 m/s-m) early in the morning
                    increasing to fair max (6540 m/s-m) in the
                    afternoon.

$$
Forecaster...Gosselin
Requested by...Elizabeth Thompson
Type of request...PRESCRIBED
.TAG 2624704.0/LSX
.DELDT 10/28/26
.FormatterVersion 2.0.0