573
FNUS73 KLSX 031608
FWSLSX

Spot Forecast for Sac Prairie Unit...DNR
National Weather Service Saint Louis MO
1008 AM CST Mon Feb 3 2025

Forecast is based on ignition time of 1100 CST on February 03.
If conditions become unrepresentative, contact the
National Weather Service.

.DISCUSSION...
The mixing height is not expected to climb above 1700 feet until after
Noon, but smoke dispersion is expected remain poor because of stable
conditions and relatively weak winds today.  Temperatures today will be
warm for early Feburary will highs close to 70 and the minimum relative
humidty will be near 40 percent.  A cold front will move through the burn
site between 4 and 6 pm causing the winds to shift from southwest to
north.  Tempeatures tomorrow will be cooler with highs only in the
40s with a minimum relative humidity in the 55 to 60 percent range.
Smoke dispersion is expected to be poor tomorrow morning but improve
slightly to marginal in the afternoon.

.REST OF TODAY...

Sky/weather.........Sunny (15-25 percent).
Chance of pcpn......0 percent.
Temperature.........61 at ignition...Max 69.
RH..................56 percent at ignition...Min 42 percent.
Wind (20 ft)........Winds southwest at 7 mph at
                    ignition...otherwise West winds 6 to 7 mph
                    decreasing to around 5 mph late in the
                    afternoon.
Eye level winds.....Winds around 2 mph with an adjustment factor of 0.3.
Mixing height.......1500 ft AGL at ignition...otherwise max 2400 ft
                    AGL.
Transport winds.....West 10 to 16 mph.
Smoke dispersal.....Poor /3280 m/s-m/ at ignition. Max...poor /4260
                    m/s-m/.

TIME (CST)      11 AM  1 PM   3 PM   5 PM   7 PM   9 PM
Sky (%).........17     15     21     21     27     33
Weather cov.....
Weather type....NONE   NONE   NONE   NONE   NONE   NONE
Tstm cov........
CWR.............0      0      0      0      0      0
Temp............61     67     69     67     58     48
RH..............56     46     42     44     60     77
20 ft wind......SW 7   W 7    W 7    W 5    N 10   N 9
20 ft wind gust.14     15     13     11     13     19
Eye level wind..SW 3   W 3    W 3    W 2    N 5    N 4
Eye lvl wnd gst.6      7      6      5      6      9
Mix hgt (kft)...1.5    2.3    1.9    0.6    0.5    0.8
Transport wind..W 16   W 14   W 12   W 10   N 15   N 18
Vrate kt-ft/1K..21     27     19     6      7      13
Ventrate Cat....POOR   POOR   POOR   POOR   POOR   POOR

.TONIGHT...

Sky/weather.........Partly cloudy (30-40 percent) then becoming
                    mostly cloudy (55-65 percent).
Chance of pcpn......0 percent.
Temperature.........Min 34.
RH..................Max 85 percent.
Wind (20 ft)........North winds 6 to 10 mph with gusts to around 19
                    mph becoming 7 to 8 mph overnight.
Eye level winds.....Winds around 3 mph with an adjustment factor of 0.3.
Mixing height.......Min 400 ft AGL.
Transport winds.....North 13 to 18 mph becoming 15 to 17 mph
                    overnight.
Smoke dispersal.....Marginal (4700 m/s-m) early in the evening
                    decreasing to poor min (720 m/s-m) late in the
                    night.

.TUESDAY...

Sky/weather.........Mostly sunny (45-55 percent).
Chance of pcpn......0 percent.
Temperature.........Max 46.
RH..................Min 58 percent.
Wind (20 ft)........Northeast winds 5 to 8 mph.
Eye level winds.....Winds around 3 mph with an adjustment factor of 0.3.
Mixing height.......Max 2500 ft AGL.
Transport winds.....East 13 to 18 mph.
Smoke dispersal.....Poor (2440 m/s-m) early in the morning
                    increasing to marginal max (5200 m/s-m) in the
                    afternoon.

$$
Forecaster...Britt
Requested by...Franny Stockton
Type of request...PRESCRIBED
.TAG 2502107.0/LSX
.DELDT 02/03/25
.FormatterVersion 2.0.0