068
FNUS73 KLSX 231413
FWSLSX
SPOT FORECAST FOR FORESTRY WOODLAND...ST. LOUIS COUNTY PARKS FORESTRY
NATIONAL WEATHER SERVICE SAINT LOUIS MO
813 AM CST WED NOV 23 2022
FORECAST IS BASED ON IGNITION TIME OF 1100 CST ON NOVEMBER 23.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE
NATIONAL WEATHER SERVICE.
DISCUSSION
WINDS THROUGH THE BOUNDARY LAYER WILL BE WEAK OUT OF THE SOUTH,
AND WHILE TEMPERATURES WARM TO AROUND WHERE THEY WERE YESTERDAY,
RH VALUES WILL BE ON THE RISE AS DEWPOINT TEMPERATURES SLOWLY
INCREASE. MIXING HEIGHTS ONLY RISE TO ABOUT 1500FT BY THE EARLY
AFTERNOON, BUT THE INVERSION APPEARS VERY WEAK AND MAY BE OVERCOME
BY THE LOCALLY-HOTTER CONDITIONS THE FIRE WOULD CAUSE. WHILE THE
FORECAST BELOW DOES CALL FOR LARGELY-POOR VENTILATION RATES GIVEN
THE WEAK WINDS AND LOW MIXING HEIGHTS, MORE IMPROVED VENTILATION
MAY OCCURRED IN A LOCALIZED SENSE WHERE THE INVERSION CAN BE
OVERCOME.
REST OF TODAY
SKY/WEATHER.........MOSTLY SUNNY (35-45 PERCENT) THEN BECOMING
MOSTLY CLOUDY (70-80 PERCENT).
TEMPERATURE.........54 AT IGNITION...MAX 62.
RH..................54 PERCENT AT IGNITION...MIN 44 PERCENT.
WIND (20 FT)........WINDS SOUTH AT 4 MPH AT IGNITION...OTHERWISE
LIGHT WINDS BECOMING SOUTHEAST 5 TO 6 MPH IN
THE AFTERNOON.
EYE LEVEL WINDS.....LIGHT WINDS AT IGNITION BECOMING SOUTHEAST AT
2 TO 3 MPH IN THE AFTERNOON (CORRECTION OF 0.3
USED).
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED
FIRE GROWTH AT IGNITION...MAX 4.
MIXING HEIGHT.......1000 FT AGL AT IGNITION...OTHERWISE MAX 2800 FT
AGL.
TRANSPORT WINDS.....SOUTH 5 TO 12 MPH.
SMOKE DISPERSAL.....POOR /660 M/S-M/ AT IGNITION. MAX...POOR /4480
M/S-M/.
TIME (CST) 11 AM 1 PM 3 PM 5 PM 7 PM 9 PM
SKY (%).........20 40 56 73 73 62
WEATHER COV.....
WEATHER TYPE....NONE NONE NONE NONE NONE NONE
TSTM COV........
TEMP............54 61 62 55 50 47
RH..............54 44 44 57 68 71
20 FT WIND......S 4 SE 6 SE 6 SE 5 SE 5 SE 4
20 FT WIND GUST.7 9 12 12 12 10
EYE LEVEL WIND..S 2 SE 3 SE 3 SE 2 SE 2 SE 2
EYE LVL WND GST.3 4 6 6 6 5
MIX HGT (KFT)...1.0 2.6 2.4 0.7 0.5 0.5
TRANSPORT WIND..S 5 S 7 S 7 S 12 S 15 S 12
HAINES INDEX....4 4 4 4 4 4
VRATE KT-FT/1K..4 16 15 7 7 5
VENTRATE CAT....POOR POOR POOR POOR POOR POOR
FORECASTER...MRB
REQUESTED BY...JASON PRATTE
TYPE OF REQUEST...PRESCRIBED
.TAG 2221776.0/LSX
.DELDT 11/23/22
.FORMATTERVERSION 2.0.0
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