429
FNUS73 KLSX 250935
FWSLSX
SPOT FORECAST FOR GRASSHOPPER HOLLOW RX...US FOREST SERVICE
NATIONAL WEATHER SERVICE SAINT LOUIS MO
435 AM CDT WED MAR 25 2026
FORECAST IS BASED ON IGNITION TIME OF 1100 CDT ON MARCH 25.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE
NATIONAL WEATHER SERVICE.
DISCUSSION
WELL ABOVE AVERAGE TEMPERATURES AND DRY CONDITIONS ARE EXPECTED
TODAY WITH SOME CLOUDS AND LIGHT SOUTHWESTERLY WINDS. FROM
IGNITION TIME INTO THE AFTERNOON, RH WILL GENERALLY BE BETWEEN
30 AND 45 PERCENT. MIXING HEIGHTS WILL ALSO BE RISING FROM AROUND
2000 FT AGL AT IGNITION TO BETWEEN 3500 AND 5500 FT AGL THIS
AFTERNOON, QUICKLY IMPROVING SMOKE DISPERSAL TO GOOD DESPITE THE
LIGHT WIND. A TEMPERATURE INVERSION WILL DEVELOP AROUND SUNSET,
OR 6 TO 7 PM THIS EVENING, ABRUPTLY DEGRADING SMOKE DISPERSAL.
REST OF TODAY
SKY/WEATHER.........MOSTLY SUNNY (30-40 PERCENT).
CWR.................1 PERCENT.
CHANCE OF THUNDER...3 PERCENT.
TEMPERATURE.........52 AT IGNITION...MAX 80.
RH..................50 PERCENT AT IGNITION...MIN 35 PERCENT.
EYE LEVEL WINDS.....SOUTHWEST WINDS AROUND 2 MPH. AN ADJUSTMENT
FACTOR OF 0.3 IS USED.
WIND (20 FT)........SOUTHWEST WINDS AROUND 5 MPH.
MIXING HEIGHT.......800 FT AGL AT IGNITION...OTHERWISE MAX 5200 FT
AGL.
TRANSPORT WINDS.....SOUTHWEST 10 TO 18 MPH.
SMOKE DISPERSAL.....POOR /1070 M/S-M/ AT IGNITION. MAX...GOOD
/13200 M/S-M/.
TIME (CDT) 9 AM 11 AM 1 PM 3 PM 5 PM 7 PM
SKY (%).........38 29 32 36 29 18
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............52 65 74 80 80 75
RH..............50 45 40 35 38 45
20 FT WIND......S 2 SW 4 SW 5 S 5 S 5 S 4
20 FT WIND GUST.10 14 15 16 16 15
EYE LEVEL WIND..S 1 SW 2 SW 2 S 2 S 2 S 2
EYE LVL WND GST.5 6 7 7 7 7
MIX HGT (KFT)...0.8 2.0 3.4 4.8 4.8 0.7
TRANSPORT WIND..SW 10 SW 16 SW 15 SW 17 SW 18 S 15
VRATE KT-FT/1K..7 28 44 72 77 10
VENTRATE CAT....POOR POOR FAIR GOOD GOOD POOR
TONIGHT
SKY/WEATHER.........MOSTLY CLEAR (10-20 PERCENT).
CWR.................1 PERCENT.
CHANCE OF THUNDER...3 PERCENT.
TEMPERATURE.........MIN 61.
RH..................MAX 81 PERCENT.
EYE LEVEL WINDS.....LIGHT WINDS.
WIND (20 FT)........LIGHT WINDS.
MIXING HEIGHT.......MIN 700 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 14 TO 18 MPH.
SMOKE DISPERSAL.....GOOD (9430 M/S-M) EARLY IN THE EVENING
DECREASING TO POOR MIN (1290 M/S-M) LATE IN THE
NIGHT.
THURSDAY
SKY/WEATHER.........SUNNY (0-10 PERCENT).
CWR.................0 PERCENT.
CHANCE OF THUNDER...1 PERCENT.
TEMPERATURE.........MAX 92.
RH..................MIN 31 PERCENT.
EYE LEVEL WINDS.....SOUTHWEST WINDS 2 MPH WITH GUSTS TO AROUND 7 MPH.
AN ADJUSTMENT FACTOR OF 0.3 IS USED.
WIND (20 FT)........SOUTHWEST WINDS 5 TO 6 MPH WITH GUSTS TO AROUND
23 MPH.
MIXING HEIGHT.......MAX 5100 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 15 TO 24 MPH INCREASING TO 25 TO 30
MPH LATE IN THE AFTERNOON.
SMOKE DISPERSAL.....POOR (1490 M/S-M) EARLY IN THE MORNING
INCREASING TO GOOD MAX (14060 M/S-M) IN THE
AFTERNOON INCREASING TO EXCELLENT (15370 M/S-M)
LATE IN THE AFTERNOON.
FORECASTER...PFAHLER
REQUESTED BY...WILLIAM KISER
TYPE OF REQUEST...PRESCRIBED
.TAG 2607703.0/LSX
.DELDT 03/25/26
.FORMATTERVERSION 2.0.0
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