410
FNUS73 KLSX 130952
FWSLSX

Spot Forecast for Coffeen SFWA UMA...IL DNR
National Weather Service Saint Louis MO
352 AM CST Thu Nov 13 2025

Forecast is based on ignition time of 0900 CST on November 13.
If conditions become unrepresentative, contact the
National Weather Service.

.DISCUSSION...

Gradually-increasing cloud cover and a strengthening inversion
aloft will stunt deeper mixing (2100-2300ft) at the unit today,
but still expect an unseasonably warm and dry day with southerly
winds up to 10mph. It`s unlikely to see values over 15mph. RH
values will need to be monitored: minimum values of 28% are
forecast, with a worst-case scenario of 22-25% possible in the
afternoon in cloud cover isn`t as robust. With fairly light
transport winds, don`t expect quick smoke dispersion. That said,
the very lowest part of the atmosphere should be unstable enough
to get smoke away from the ground fairly quickly.

RH recovery will improve going forward with more unfettered
moisture return streaming into Missouri through Saturday. Sunday
will cool down to near-normal and wetting rain chances increase
Monday onward.

.REST OF TODAY...

Sky/weather.........Mostly sunny (35-45 percent).
CWR.................0 percent.
Chance of thunder...0 percent.
Temperature.........45 at ignition...Max 62.
RH..................60 percent at ignition...Min 28 percent.
Eye level winds.....Light southeast winds increasing to 2-3 mph
(correction of 0.4 used).
Wind (20 ft)........Winds southeast at 2 mph at
                    ignition...otherwise South winds 5 to 6 mph
                    late in the morning becoming light, then
                    becoming south 5 to 6 mph in the afternoon.
Mixing height.......400 ft AGL at ignition...otherwise max 2300 ft
                    AGL.
Transport winds.....Southeast around 5 mph shifting to the south 6
                    to 9 mph late in the morning.
Smoke dispersal.....Poor /250 m/s-m/ at ignition. Max...poor /2510
                    m/s-m/.

TIME (CST)      9 AM   11 AM  1 PM   3 PM   5 PM   7 PM
Sky (%).........65     50     41     16     10     5
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............45     56     61     62     55     50
RH..............60     37     30     31     41     58
20 ft wind......SE 2   S 4    S 6    S 6    SE 6   S 6
20 ft wind gust.5      6      7      9      9      11
Eye level wind..SE 1   S 2    S 3    S 3    SE 3   S 3
Eye lvl wnd gst.2      3             4      4      5
Mix hgt (kft)...0.4    1.4    2.2    2.0    0.4    0.4
Transport wind..E 5    S 6    S 8    S 9    S 9    S 13
Vrate kt-ft/1K..2      7      15     16     3      5
Ventrate Cat....POOR   POOR   POOR   POOR   POOR   POOR

.TONIGHT...

Sky/weather.........Partly cloudy (25-35 percent) then becoming
                    mostly cloudy (50-60 percent).
CWR.................0 percent.
Chance of thunder...2 percent.
Temperature.........Min 43.
RH..................Max 100 percent.
Eye level winds.....South winds 2-3 mph becoming light (correction
of 0.4 used).
Wind (20 ft)........South winds 5 to 6 mph in the evening becoming
                    light.
Mixing height.......400 ft AGL.
Transport winds.....South 12 to 14 mph.
Smoke dispersal.....Poor (610 m/s-m).

$$
Forecaster...MRB
Requested by...Emma Launer
Type of request...PRESCRIBED
.TAG 2525777.0/LSX
.DELDT 11/13/25
.FormatterVersion 2.0.0