154
FNUS73 KPAH 251300
FWSPAH
SPOT FORECAST FOR BSB UNIT 5 GRASSLAND...MDC
NATIONAL WEATHER SERVICE PADUCAH KY
800 AM CDT TUE AUG 25 2026
FORECAST IS BASED ON IGNITION TIME OF 1000 CDT ON AUGUST 25.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
RELATIVE HUMIDITY WILL LIKELY REMAIN ABOVE 50% THIS AFTERNOON.
MIXING HEIGHTS WILL BE WELL OVER 4000' AGL, BUT WITH VERY LIGHT
EAST WINDS, DISPERSION WILL BE POOR ALL DAY. RELATIVE HUMIDITY
WILL RECOVER TO 90% OR MORE TONIGHT. LIGHT WINDS WILL CONTINUE
WEDNESDAY, BUT MIXING WILL BE MUCH DEEPER, WHICH WILL PROVIDE A
WINDOW OF FAIR DISPERSION IN THE MIDDLE OF THE AFTERNOON. ON THE
DOWNSIDE WEDNESDAY, THERE IS A CHANCE OF SHOWERS AND THUNDERSTORMS
IN THE AFTERNOON AND THE RELATIVE HUMIDITY WILL STRUGGLE TO DROP
BELOW 60%.
REST OF TODAY
SKY/WEATHER.........MOSTLY SUNNY (30-40 PERCENT).
CWR.................0 PERCENT.
TEMPERATURE.........73 AT IGNITION...MAX 85.
RH..................73 PERCENT AT IGNITION...MIN 57 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......WINDS SOUTHEAST AT 2 MPH AT
IGNITION...OTHERWISE LIGHT WINDS.
MIXING HEIGHT.......1400 FT AGL AT IGNITION...OTHERWISE 4400 FT
AGL.
TRANSPORT WINDS.....SOUTHEAST 5 TO 7 MPH.
SMOKE DISPERSAL.....POOR /8200 KNOT-FT/ AT IGNITION. MAX...POOR
/19000 KNOT-FT/.
TIME (CDT) 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY COVER.......PC PC PC PC PC PC MCR PC
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0
TEMP............73 76 78 80 83 84 85 85
RH..............73 69 67 65 61 59 59 57
20 FT WIND DIR..SE SE SE E E E E E
20 FT WIND SPD..2 2 2 2 2 2 2 2
20 FT WIND GUST.6 6 6 6 6 6 6 7
MIX HGT (KFT)...1.4 2.1 2.8 3.5 4.0 4.2 4.4 3.8
TRANSP WIND DIR.SE SE SE E E E E E
TRANSP WIND SPD.7 6 5 5 5 5 5 6
VRATE KT-FT/1K..8 11 11 14 16 17 18 19
VENTRATE CAT....PR PR PR PR PR PR PR PR
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY (30-40 PERCENT) THEN BECOMING
MOSTLY CLOUDY (50-60 PERCENT) THEN BECOMING
PARTLY CLOUDY (30-40 PERCENT) THEN BECOMING
MOSTLY CLOUDY (55-65 PERCENT) THEN BECOMING
PARTLY CLOUDY (30-40 PERCENT).
CWR.................0 PERCENT.
TEMPERATURE.........MIN 66.
RH..................MAX 90 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......LIGHT WINDS.
MIXING HEIGHT.......400 FT AGL.
TRANSPORT WINDS.....EAST 6 TO 7 MPH SHIFTING TO THE SOUTH
OVERNIGHT.
SMOKE DISPERSAL.....POOR (2100 KNOT-FT).
TIME (CDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY COVER.......PC PC PC MC PC PC MC PC MCR PC MCR MCR
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
TEMP............83 82 79 75 73 72 71 71 70 70 68 68
RH..............59 65 69 76 79 81 81 81 84 81 87 87
20 FT WIND DIR..E E E E E SE SE SE SE SE S S
20 FT WIND SPD..2 2 2 2 2 2 2 2 1 1 1 1
20 FT WIND GUST.6 5 5 5 5 5 5 3 3 3 3 3
MIX HGT (KFT)...2.0 0.4 0.4 0.5 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4
TRANSP WIND DIR.E E E E E E SE SE S S S S
TRANSP WIND SPD.6 6 7 7 7 7 7 7 7 6 7 6
VRATE KT-FT/1K..10 2 3 3 3 3 3 3 3 2 3 2
VENTRATE CAT....PR PR PR PR PR PR PR PR PR PR PR PR
WEDNESDAY
SKY/WEATHER.........MOSTLY SUNNY (25-35 PERCENT). SLIGHT CHANCE OF
SHOWERS AND THUNDERSTORMS IN THE AFTERNOON.
CWR.................0 PERCENT.
TEMPERATURE.........MAX 89.
RH..................MIN 59 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......LIGHT WINDS. GUSTY AND ERRATIC WINDS EXPECTED
NEAR THUNDERSTORMS IN THE AFTERNOON.
MIXING HEIGHT.......6300 FT AGL.
TRANSPORT WINDS.....SOUTHEAST AROUND 5 MPH SHIFTING TO THE
NORTHEAST AROUND 6 MPH EARLY IN THE MORNING,
THEN SHIFTING TO THE SOUTHWEST 7 TO 9 MPH IN
THE LATE MORNING AND EARLY AFTERNOON SHIFTING
TO THE WEST AROUND 8 MPH LATE IN THE AFTERNOON.
SMOKE DISPERSAL.....POOR (1500 KNOT-FT) EARLY IN THE MORNING
INCREASING TO FAIR (50100 KNOT-FT) IN THE
AFTERNOON.
TIME (CDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM
SKY COVER.......PCLDY MCLDY PCLDY PCLDY MCLEAR MCLEAR
WEATHER COV..... S CHC S CHC
WEATHER TYPE....NONE NONE NONE NONE RNSHWR RNSHWR
TSTM COV........ S CHC S CHC
CWR.............0 0 0 0 0 0
TEMP............68 69 78 83 87 89
RH..............87 87 71 67 61 59
20 FT WIND DIR..SE S S SW SW SW
20 FT WIND SPD..1 1 2 2 2 2
20 FT WIND GUST.3 3 6 6 6 7
MIX HGT (KFT)...0.4 0.7 1.5 3.5 5.8 5.3
TRANSP WIND DIR.S NE S SW S W
TRANSP WIND SPD.5 6 7 7 9 8
VRATE KT-FT/1K..2 3 9 21 46 37
VENTRATE CAT....POOR POOR POOR POOR FAIR POOR
FORECASTER...SPAETH
REQUESTED BY...KYLE LORENZ
TYPE OF REQUEST...PRESCRIBED
.TAG 2620481.0/PAH
.DELDT 08/25/26
.FORMATTERVERSION 2.0.0
.EMAIL KYLE.LORENZ@MDC.MO.GOV
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