591
FNUS73 KMPX 101147
FWSMPX
SPOT FORECAST FOR LAKE JOHANNA ICE SHELF SUMAC...THE NATURE CONSERVANCY
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
647 AM CDT WED SEP 10 2025
FORECAST IS BASED ON IGNITION TIME OF 1100 CDT ON SEPTEMBER 10.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
PLEASE CONTACT OUR OFFICE IF YOU HAVE QUESTIONS OR CONCERNS WITH
THIS FORECAST.
DISCUSSION
FOR THE LAKE JOHANNA ICE SHELF SUMAC PRESCRIBED FIRE, DENSE FOG
WILL CONTINUE TO MIX OUT AND BECOME MOSTLY CLEAR BY MID MORNING.
NO RAIN IS IN THE FORECAST TODAY. EASTERLY WINDS BETWEEN 5-7KTS
WITH OCCASIONAL GUSTS UP TO 12KTS CAN BE EXPECTED. RELATIVE
HUMIDITY VALUES WILL CONTINUE TO DECREASE AS FOG DIMINISHES AND
REACHING THE LOW 60 PERCENTS BY NOON.
REST OF TODAY
SKY/WEATHER.........PARTLY SUNNY (45-55 PERCENT) THEN BECOMING
SUNNY (10-20 PERCENT).
TEMPERATURE.........64 AT IGNITION...MAX 73.
RH..................87 PERCENT AT IGNITION...MIN 62 PERCENT.
WIND (20 FT)........WINDS EAST AT 6 MPH AT IGNITION...OTHERWISE
EAST WINDS 6 TO 7 MPH.
SMOKE DISPERSAL.....FAIR /14400 KNOT-FT/ AT IGNITION. MAX...FAIR
/25100 KNOT-FT/.
MIXING HEIGHT.......1600 FT AGL AT IGNITION...OTHERWISE 3000 FT
AGL.
TRANSPORT WINDS.....EAST 9 TO 10 MPH.
TIME (CDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY COVER.......MC MC PC MCR MCR MCR MCR MCR CLR CLR CLR MCR
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
TEMP............64 67 69 71 73 73 73 72 68 64 61 59
RH..............87 78 73 68 64 62 64 64 76 87 93 96
20 FT WIND DIR..E E E E E E E E E E E E
20 FT WIND SPD..6 6 7 7 7 7 6 6 6 5 6 6
20 FT WIND GUST.10 12 13 12 13 12 12 12 9 8 9 9
MIX HGT (KFT)...1.6 2.1 2.2 2.5 2.8 3.0 2.9 2.2 0.4 0.3 0.3 0.3
TRANSP WIND DIR.E E E E E E E E E E E E
TRANSP WIND SPD.10 10 10 10 10 9 9 10 8 8 9 9
TONIGHT
SKY/WEATHER.........MOSTLY CLEAR (15-25 PERCENT). PATCHY FOG EARLY
IN THE MORNING.
TEMPERATURE.........MIN 55.
RH..................MAX 100 PERCENT.
WIND (20 FT)........EAST WINDS 5 TO 6 MPH.
SMOKE DISPERSAL.....FAIR (19400 KNOT-FT) EARLY IN THE EVENING
DECREASING TO POOR (2200 KNOT-FT) LATE IN THE
NIGHT.
MIXING HEIGHT.......300 FT AGL.
TRANSPORT WINDS.....EAST 8 TO 12 MPH.
THURSDAY
SKY/WEATHER.........MOSTLY SUNNY (45-55 PERCENT). PATCHY FOG EARLY
IN THE MORNING.
TEMPERATURE.........MAX 75.
RH..................MIN 62 PERCENT.
WIND (20 FT)........SOUTHEAST WINDS 6 TO 13 MPH.
SMOKE DISPERSAL.....POOR (3500 KNOT-FT) EARLY IN THE MORNING
INCREASING TO FAIR (28400 KNOT-FT) IN THE
AFTERNOON.
MIXING HEIGHT.......2400 FT AGL.
TRANSPORT WINDS.....SOUTHEAST 10 TO 14 MPH.
FORECASTER...DUNLEAVY
REQUESTED BY...BEN CARLSON
TYPE OF REQUEST...PRESCRIBED
.TAG 2521687.0/MPX
.DELDT 09/10/25
.FORMATTERVERSION 2.0.0
.EMAIL BENJAMIN.CARLSON@TNC.ORG
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