864
FNUS73 KLSX 211048
FWSLSX

Spot Forecast for KRP_1...USACE
National Weather Service Saint Louis MO
548 AM CDT Fri Aug 21 2026

Forecast is based on ignition time of 1200 CDT on August 21.
If conditions become unrepresentative, contact the
National Weather Service.

.DISCUSSION...
It will be dry today with light and variable winds. Mixing
heights at ignition time are expected to be between 3000-3500
feet with a maximum of 4000-4500 feet this afternon at around
300 PM. Minimum relative humidity this afternoon will be around
65 percent. Winds in the mixed layer will also be light and
variable which will poor conditions for smoke dispersal.

.REST OF TODAY...

Sky/weather.........Sunny (5-15 percent).
CWR.................0 percent.
Chance of thunder...0 percent.
Temperature.........80 at ignition...Max 85.
RH..................77 percent at ignition...Min 65 percent.
Wind (20 ft)........Winds north at 1 mph at ignition...otherwise
                    Light winds.
Mixing height.......3300 ft AGL at ignition...otherwise max 4400 ft
                    AGL.
Transport winds.....Northwest 2 to 5 mph.
Smoke dispersal.....Poor /1020 m/s-m/ at ignition. Max...poor /2560
                    m/s-m/.

TIME (CDT)      NOON   2 PM   4 PM   6 PM   8 PM   10 PM
Sky (%).........10     5      14     11     16     13
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............80     84     85     84     79     73
RH..............77     67     65     67     79     93
20 ft wind......N 1    NW 1   N 2    S 1    SE 1   SE 1
20 ft wind gust.3      3      3      3      2      2
Mix hgt (kft)...3.3    4.1    4.4    2.0    0.4    0.4
Transport wind..NW 2   W 5    W 3    W 3    SE 5   S 5
Vrate kt-ft/1K..7      16     13     6      2      2
Ventrate Cat....POOR   POOR   POOR   POOR   POOR   POOR

.TONIGHT...

Sky/weather.........Partly cloudy (20-30 percent) then becoming
                    mostly cloudy (55-65 percent) then becoming
                    mostly clear (20-30 percent).
CWR.................1 percent.
Chance of thunder...0 percent.
Temperature.........Min 67.
RH..................Max 100 percent.
Wind (20 ft)........Light winds.
Mixing height.......Min 400 ft AGL.
Transport winds.....West around 3 mph shifting to the southeast 3
                    to 5 mph early in the evening, then shifting to
                    the south 5 to 7 mph in the late evening and
                    overnight shifting to the west around 7 mph
                    after 3 am.
Smoke dispersal.....Poor (200 m/s-m).

.SATURDAY...

Sky/weather.........Sunny (15-25 percent).
CWR.................2 percent.
Chance of thunder...0 percent.
Temperature.........Max 85.
RH..................Min 63 percent.
Wind (20 ft)........Light winds becoming northwest 5 to 7 mph in
                    the late morning and afternoon.
Mixing height.......Max 5700 ft AGL.
Transport winds.....Northwest 7 to 14 mph shifting to the north 13
                    to 15 mph late in the afternoon.
Smoke dispersal.....Poor (380 m/s-m) early in the morning
                    increasing to good max (10780 m/s-m) in the
                    afternoon.

$$
Forecaster...Carney
Requested by...Brian Stoff
Type of request...PRESCRIBED
.TAG 2620093.0/LSX
.DELDT 08/21/26
.FormatterVersion 2.0.0