846
FNUS73 KLSX 172100
FWSLSX
SPOT FORECAST FOR GRASSY FIRE...USDA FOREST SERVICE - MARK TWAIN NF
NATIONAL WEATHER SERVICE SAINT LOUIS MO
400 PM CDT THU APR 17 2025
FORECAST IS BASED ON FORECAST START TIME OF 1600 CDT ON APRIL 17.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE
NATIONAL WEATHER SERVICE.
DISCUSSION
GUSTY WINDS OUT OF THE SOUTH-SOUTHEAST WILL PERSIST FOR THE
REMAINDER OF THE AFTERNOON AND INTO THE EARLY EVENING HOURS. WHILE
GUST SPEEDS WILL DIMINISH AFTER DARK, SUSTAINED SURFACE WINDS WILL
LIKELY REMAIN BREEZY THROUGH THE NIGHT. WINDS ARE EXPECTED TO VEER
SLIGHTLY TO THE SOUTHWEST TOMORROW MORNING, AND GUST SPEEDS ARE
LIKELY TO INCREASE AGAIN FROM MID MORNING THROUGH THE REMAINDER OF
THE DAY TOMORROW. GUST SPEEDS TOMORROW AFTERNOON MAY BE SLIGHTLY
LOWER THAN TODAY, BUT STILL PROMINENT.
HUMIDITY WILL STEADILY INCREASE THIS EVENING AND OVERNIGHT AS
TEMPERATURES DROP, AND WILL DECREASE AGAIN DURING THE AFTERNOON
TOMORROW. HUMIDITY LEVELS TOMORROW AFTERNOON WILL LIKELY BE
SIMILAR TO THAT OF TODAY. MIXING HEIGHTS ARE LIKELY TO RISE TO
AROUND 4000 TO 5000 FEET, WITH MODERATE INSTABILITY EXPECTED AS
WELL. THIS SHOULD PROMOTE EFFICIENT VENTILATION.
NO ADDITIONAL PRECIPITATION IS EXPECTED UNTIL AT LEAST LATE
FRIDAY NIGHT, WHEN MULTIPLE ROUNDS OF THUNDERSTORMS AND HEAVY RAIN
ARE LIKELY TO BEGIN. WIDESPREAD WETTING RAIN IS EXPECTED BETWEEN
LATE FRIDAY NIGHT AND SUNDAY NIGHT.
REST OF TODAY
SKY/WEATHER.........MOSTLY SUNNY (35-45 PERCENT).
CHANCE OF PCPN......0 PERCENT.
TEMPERATURE.........78 AT FORECAST START...MAX 78.
RH..................43 PERCENT AT FORECAST START...MIN 40 PERCENT.
WIND (20 FT)........SOUTH WINDS 10 TO 15 MPH WITH
GUSTS TO AROUND 30 MPH.
EYE LEVEL WINDS.....SOUTH WINDS 4 TO 6 MPH WITH
GUSTS TO AROUND 15 MPH.
MIXING HEIGHT.......4300 FT AGL AT FORECAST START...OTHERWISE MAX
4300 FT AGL.
TRANSPORT WINDS.....SOUTH AROUND 35 MPH.
SMOKE DISPERSAL.....EXCELLENT /20300 M/S-M/ AT FORECAST START.
MAX...EXCELLENT /20300 M/S-M/.
TIME (CDT) 3 PM 5 PM 7 PM 9 PM 11 PM 1 AM
SKY (%).........39 36 30 13 37 74
WEATHER COV.....
WEATHER TYPE....NONE NONE NONE NONE NONE NONE
TSTM COV........
CWR.............0 0 0 0 0 0
TEMP............78 73 70 68 68 67
RH..............43 49 59 65 65 70
20 FT WIND......S 10 S 10 S 10 S 9 S 10 S 10
20 FT WIND GUST.25 25 24 24 25 25
EYE LEVEL WIND..S 5 S 5 S 5 S 4 S 5 S 5
EYE LVL WND GST.12 12 11 11 12 12
MIX HGT (KFT)...4.3 3.6 0.7 0.8 0.7 0.7
TRANSPORT WIND..S 35 S 33 S 20 S 21 S 21 S 22
VRATE KT-FT/1K..129 105 13 15 12 13
VENTRATE CAT....VYGD VYGD POOR POOR POOR POOR
TONIGHT
SKY/WEATHER.........MOSTLY CLEAR (20-30 PERCENT) THEN BECOMING
MOSTLY CLOUDY (60-70 PERCENT).
CHANCE OF PCPN......0 PERCENT.
TEMPERATURE.........MIN 65.
RH..................MAX 75 PERCENT.
WIND (20 FT)........SOUTH WINDS 8 TO 11 MPH WITH GUSTS TO AROUND 20
MPH.
EYE LEVEL WINDS.....SOUTH WINDS 3 TO 5 MPH WITH GUSTS TO AROUND 10
MPH.
MIXING HEIGHT.......MIN 500 FT AGL.
TRANSPORT WINDS.....SOUTH AROUND 33 MPH DECREASING TO 20 TO 23 MPH.
SMOKE DISPERSAL.....EXCELLENT (16510 M/S-M) EARLY IN THE EVENING
DECREASING TO POOR MIN (1490 M/S-M) LATE IN THE
NIGHT.
FRIDAY
SKY/WEATHER.........MOSTLY SUNNY (45-55 PERCENT) THEN BECOMING
MOSTLY CLOUDY (70-80 PERCENT). SLIGHT CHANCE OF
SHOWERS AND THUNDERSTORMS LATE IN THE
EVENING.
CHANCE OF PCPN......20 PERCENT.
TEMPERATURE.........MAX 82.
RH..................MIN 43 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 9 TO 12 MPH WITH GUSTS TO
AROUND 25 MPH. GUSTY AND ERRATIC WINDS POSSIBLE
WITH THUNDERSTORMS LATE IN THE EVENING.
EYE LEVEL WINDS.....SOUTHWEST WINDS 4 TO 6 MPH WITH GUSTS TO
AROUND 12 MPH. GUSTY AND ERRATIC WINDS POSSIBLE
WITH THUNDERSTORMS LATE IN THE EVENING.
MIXING HEIGHT.......MAX 4900 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 23 TO 31 MPH.
SMOKE DISPERSAL.....POOR (1820 M/S-M) EARLY IN THE MORNING
INCREASING TO EXCELLENT MAX (17490 M/S-M) IN
THE AFTERNOON.
FORECASTER...19
REQUESTED BY...PATRIC MARLOW
TYPE OF REQUEST...WILDFIRE
.TAG 2510928.0/LSX
.DELDT 04/17/25
.FORMATTERVERSION 2.0.0
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page