887  
FNUS73 KAPX 200938  
FWSAPX  
 
SPOT FORECAST FOR ZISSLER WEST...USFS  
NATIONAL WEATHER SERVICE GAYLORD MI  
538 AM EDT TUE MAY 20 2025  
 
FORECAST IS BASED ON IGNITION TIME OF 0600 EDT ON MAY 20.  
IF CONDITIONS BECOME UNREPRESENTATIVE... CONTACT THE NATIONAL WEATHER  
SERVICE.  
 
PLEASE CONTACT OUR OFFICE AT (989)732-9306, IF YOU HAVE QUESTIONS  
OR CONCERNS WITH THIS FORECAST.  
   
DISCUSSION  
 
BREEZY EAST WINDS ARE ANTICIPATED THROUGH MUCH OF THE DAY TODAY WITH  
20 FT WIND GUSTS UP TO 25 MPH. IF WINDS ARE NOT BREEZY TO START  
THE PERIOD, THE EXPECTATION IS FOR A QUICK UPTICK THROUGH THE REST  
OF THE MORNING. DRY CONDITIONS WILL ACCOMPANY THESE WINDS, WITH  
AFTERNOON HUMIDITY DROPPING INTO THE 30S, BUT WOULD NOT BE  
SURPRISED IF THESE VALUES SNEAK INTO THE 20S AS WELL. HUMIDITY  
INCREASES OVERNIGHT AND INTO WEDNESDAY, WITH A FEW SHOWER CHANCES  
POSSIBLE LATE TONIGHT, BUT ESPECIALLY ON WEDNESDAY. COMBINATION  
OF MIXING HEIGHTS AROUND 2.5 KFT AND BREEZY CONDITIONS WILL RESULT  
IN AT LEAST GOOD VENTILATION THIS AFTERNOON.  
 
   
TODAY  
 
SKY/WEATHER.........MOSTLY SUNNY (45-55 PERCENT) THEN BECOMING  
MOSTLY CLOUDY (65-75 PERCENT).  
CHANCE OF THUNDER...0 PERCENT.  
MAX TEMPERATURE.....AROUND 52.  
MIN HUMIDITY........36 PERCENT.  
20-FOOT WINDS.......EAST WINDS 7 TO 12 MPH WITH GUSTS TO 25 MPH.  
TRANSPORT WINDS.....EAST 12 TO 21 MPH INCREASING TO 21 TO 23 MPH IN  
THE AFTERNOON.  
MIXING HEIGHT.......400-1900 FT AGL INCREASING TO 2400-2600 FT AGL  
IN THE LATE MORNING AND AFTERNOON.  
VENTILATION INDEX...POOR TO GOOD (42.0-528.0) INCREASING TO GOOD  
(533.0) IN THE AFTERNOON.  
 
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........32 42 53 58 63 68 70 72 73 73 73 73  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0  
TEMP............33 34 36 40 43 46 47 49 50 51 51 51  
RH..............74 76 72 63 55 49 47 40 38 36 34 32  
20 FT WIND DIR..E E E E E E E E E E E E  
20 FT WIND SPD..12 12 12 13 13 13 14 14 14 14 14 14  
20 FT WIND GUST.17 18 18 22 22 22 23 23 23 24 24 24  
MIX HGT (KFT)...0.4 0.4 1.2 1.9 2.4 2.5 2.5 2.6 2.6 2.5 2.5 2.5  
TRANSP WIND DIR.E E E E E E E E E E E E  
TRANSP WIND SPD.12 14 17 20 20 21 21 22 21 22 22 23  
VRATE KT-FT.....42 54 209 365 467 511 528 563 533 557 551 568  
VENTRATE CAT....PR PR FR GD GD GD GD GD GD GD GD GD  
   
TONIGHT  
 
SKY/WEATHER.........MOSTLY CLOUDY (80-90 PERCENT).  
CHANCE OF THUNDER...0 PERCENT.  
MIN TEMPERATURE.....AROUND 45.  
MAX HUMIDITY........75 PERCENT.  
20-FOOT WINDS.......EAST WINDS 8 TO 12 MPH, OCCASIONALLY BREEZY UP TO 20 MPH.  
TRANSPORT WINDS.....EAST 14 TO 22 MPH.  
MIXING HEIGHT.......600-2200 FT AGL.  
VENTILATION INDEX...POOR TO GOOD (80.0-471.0).  
 
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........79 86 92 88 84 80 83 85 88 90 92 94  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0  
TEMP............50 49 48 47 47 47 46 47 48 47 47 46  
RH..............37 38 42 47 52 56 60 57 59 61 63 65  
20 FT WIND DIR..E E E E E E E E E E E E  
20 FT WIND SPD..14 14 14 12 12 12 10 10 10 12 12 12  
20 FT WIND GUST.23 23 23 22 21 21 20 20 20 20 20 20  
MIX HGT (KFT)...2.2 1.7 1.1 0.7 0.7 0.7 0.7 0.6 0.6 0.6 0.7 0.7  
TRANSP WIND DIR.E E E E E E E E E E E E  
TRANSP WIND SPD.22 21 17 16 15 15 15 15 14 14 14 14  
VRATE KT-FT.....471 359 186 114 98 106 102 90 83 80 91 94  
VENTRATE CAT....GD GD FR PR PR PR PR PR PR PR PR PR  
   
WEDNESDAY  
 
SKY/WEATHER.........CLOUDY (85-95 PERCENT). CHANCE OF RAIN SHOWERS  
LATE IN THE AFTERNOON.  
CHANCE OF THUNDER...1 PERCENT.  
MAX TEMPERATURE.....AROUND 51.  
MIN HUMIDITY........63 PERCENT.  
20-FOOT WINDS.......NORTHEAST WINDS 9 TO 12 MPH WITH GUSTS TO  
AROUND 26 MPH.  
TRANSPORT WINDS.....EAST 14 TO 22 MPH.  
MIXING HEIGHT.......700-2400 FT AGL.  
VENTILATION INDEX...POOR TO GOOD (102.0-530.0).  
 
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........92 90 88 88 89 89 88 87 86 86 86 86  
WEATHER COV..... SCH SCH SCH SCH SCH SCH CHC CHC CHC CHC  
WEATHER TYPE.... RW RW RW RW RW RW RW RW RW RW  
TSTM COV........  
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0  
TEMP............45 45 47 46 49 49 50 50 50 51 50 50  
RH..............69 72 72 75 72 70 69 68 67 67 67 68  
20 FT WIND DIR..E E E E E E NE NE NE NE NE NE  
20 FT WIND SPD..13 13 13 14 14 14 14 14 14 14 14 14  
20 FT WIND GUST.24 24 24 25 25 25 25 25 25 26 26 26  
MIX HGT (KFT)...0.7 0.7 1.3 1.5 1.6 1.9 2.3 2.4 2.4 2.4 2.4 2.3  
TRANSP WIND DIR.E E E E E E E E E E NE NE  
TRANSP WIND SPD.14 16 20 21 21 22 22 22 22 22 22 22  
VRATE KT-FT.....102 118 247 315 337 425 500 527 523 530 525 494  
VENTRATE CAT....PR PR FR GD GD GD GD GD GD GD GD GD  
 
 
FORECASTER...JLD  
REQUESTED BY...TRAVIS WILTSE  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2514312.0/APX  
.DELDT 05/20/25  
.FORMATTERVERSION 2.0.0  
.EMAIL TRAVIS.A.WILTSE@USDA.GOV  
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