227  
FNUS73 KARX 151701  
FWSARX  
 
SPOT FORECAST FOR PRESTON NORTH SUBUNIT A...THE NATURE CONSERVANCY  
NATIONAL WEATHER SERVICE LA CROSSE WI  
1201 PM CDT MON SEP 15 2025  
 
FORECAST IS BASED ON IGNITION TIME OF 1000 CDT ON SEPTEMBER 15.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
 
PLEASE CONTACT OUR OFFICE AT (608) 784-8292 IF YOU HAVE QUESTIONS  
OR CONCERNS WITH THIS FORECAST.  
   
DISCUSSION
 
UPDATE - A MIX OF MICROSCALE WEATHER ELEMENTS HAVE  
RESULTED IN LINES/SCATTERED SHOWERS-STORMS ACROSS WESTERN WI,  
ORIENTED NORTH-SOUTH. EXPECT THIS TO CONTINUE INTO MID AFTERNOON.  
HOWEVER, EAST OF THERE LATEST SATELLITE IMAGERY SHOWS A DECREASE  
IN CLOUDS - INDICATING SINKING AREA AND/OR SOME DRYING OF THE  
AIRMASS. UNLESS THE CONVECTION CAN PUSH AN OUTFLOW BOUNDARY  
FARTHER EAST, THE THREAT FOR SHOWERS/STORMS NEAR YOUR BURN  
LOCATION CONTINUES TO BE LOW TO NONE. WE WILL CONTINUE TO KEEP A  
CLOSE EYE ON TRENDS THROUGH THE AFTERNOON. IF YOU HAVE ANYMORE  
QUESTIONS, PLEASE GIVE US A CALL.  
   
REST OF TODAY
 
 
SKY/WEATHER.........SUNNY (10-20 PERCENT).  
CWR.................0 PERCENT.  
CHANCE OF THUNDER...0 PERCENT.  
TEMPERATURE.........72 AT IGNITION...MAX 83.  
RH..................68 PERCENT AT IGNITION...MIN 51 PERCENT.  
WIND (20 FT)........WINDS SOUTHEAST AT 2 MPH AT  
IGNITION...OTHERWISE LIGHT WINDS BECOMING  
SOUTHEAST 5 TO 7 MPH IN THE AFTERNOON.  
MIXING HEIGHT.......1200 FT AGL AT IGNITION...OTHERWISE 3100 FT AGL  
INCREASING TO 3300 FT AGL LATE IN THE  
AFTERNOON.  
TRANSPORT WINDS.....SOUTH 13 TO 14 MPH.  
SMOKE DISPERSAL.....FAIR /13900 KNOT-FT/ AT IGNITION. MAX...GOOD  
/40000 KNOT-FT/.  
 
TIME (CDT) 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........11 9 13 16 14 9 14 13  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
CWR.............0 0 0 0 0 0 0 10  
CHC OF THDR (%).0 0 0 0 0 0 0 0  
TEMP............72 76 78 79 81 81 82 81  
RH..............68 60 57 54 51 53 51 53  
20 FT WIND DIR..SE S SE SE SE SE SE SE  
20 FT WIND SPD..2 4 5 6 7 7 6 5  
20 FT WIND GUST.13 13 14 14 14 14 14 14  
MIX HGT (KFT)...1.2 1.6 2.2 2.7 3.1 3.3 3.3 2.9  
TRANSP WIND DIR.S S S S S S S S  
TRANSP WIND SPD.14 13 14 14 14 14 14 13  
SDSPL KT-FT/100014 18 27 32 37 40 39 32  
   
TONIGHT
 
 
SKY/WEATHER.........PARTLY CLOUDY (25-35 PERCENT). SLIGHT CHANCE OF  
SHOWERS AND THUNDERSTORMS EARLY IN THE EVENING.  
CWR.................20 PERCENT DECREASING TO 10 PERCENT.  
CHANCE OF THUNDER...17 PERCENT.  
TEMPERATURE.........MIN 59.  
RH..................MAX 90 PERCENT.  
WIND (20 FT)........SOUTHEAST WINDS AROUND 5 MPH EARLY IN THE  
EVENING BECOMING LIGHT. GUSTY AND ERRATIC WINDS  
EXPECTED NEAR THUNDERSTORMS EARLY IN THE  
EVENING.  
MIXING HEIGHT.......400 FT AGL.  
TRANSPORT WINDS.....SOUTHEAST 9 TO 12 MPH.  
SMOKE DISPERSAL.....POOR (3600 KNOT-FT).  
 
TIME (CDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM  
SKY (%).........14 40 37 29 37 45  
WEATHER COV.....S CHC  
WEATHER TYPE....RNSHWR NONE NONE NONE NONE NONE  
TSTM COV........S CHC  
CWR.............20 10 0 0 10 10  
CHC OF THDR (%).20 10 0 0 10 10  
TEMP............79 71 66 63 62 61  
RH..............58 76 84 87 84 84  
20 FT WIND......SE 5 SE 3 SE 3 SE 2 SE 2 SE 2  
20 FT WIND GUST.13 11 11 8 7 7  
MIX HGT (FT)....800 400 400 400 400 400  
TRANSPORT WIND..SE 12 SE 10 SE 12 S 10 S 10 SE 9  
SDSPL KT-FT/10008 4 5 4 4 4  
   
TUESDAY
 
 
SKY/WEATHER.........MOSTLY SUNNY (25-35 PERCENT). SLIGHT CHANCE OF  
RAIN SHOWERS EARLY IN THE AFTERNOON.  
CWR.................10 PERCENT INCREASING TO 20 PERCENT EARLY IN  
THE AFTERNOON, THEN DECREASING TO 10 PERCENT  
LATE IN THE AFTERNOON.  
CHANCE OF THUNDER...13 PERCENT.  
TEMPERATURE.........MAX 84.  
RH..................MIN 51 PERCENT.  
WIND (20 FT)........LIGHT WINDS.  
MIXING HEIGHT.......1500 FT AGL INCREASING TO 4100 FT AGL IN THE  
AFTERNOON.  
TRANSPORT WINDS.....SOUTH 6 TO 8 MPH.  
SMOKE DISPERSAL.....POOR (2200 KNOT-FT) EARLY IN THE MORNING  
INCREASING TO FAIR (24400 KNOT-FT) IN THE  
AFTERNOON.  
 
TIME (CDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM  
SKY (%).........37 31 26 23 26 29  
WEATHER COV..... S CHC  
WEATHER TYPE....NONE NONE NONE NONE RNSHWR NONE  
TSTM COV........  
CWR.............10 10 10 10 20 10  
CHC OF THDR (%).10 10 10 10 10 10  
TEMP............59 62 72 78 82 84  
RH..............90 90 71 60 53 51  
20 FT WIND......SE 2 SE 2 S 2 S 3 S 3 S 3  
20 FT WIND GUST.6 6 7 8 8 8  
MIX HGT (FT)....400 400 900 2400 3500 4100  
TRANSPORT WIND..SE 8 S 7 S 7 S 7 S 7 S 7  
SDSPL KT-FT/10003 2 6 14 21 24  
 

 
FORECASTER...TR  
REQUESTED BY...JOHN SCHWINGEL  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2521965.0/ARX  
.DELDT 09/15/25  
.FORMATTERVERSION 2.0.0  
.EMAIL JOHN.SCHWINGEL@TNC.ORG  
 
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