507  
FNUS73 KARX 171246  
FWSARX  
 
SPOT FORECAST FOR OSR 9 A&B...USFWS  
NATIONAL WEATHER SERVICE LA CROSSE WI  
746 AM CDT THU MAY 17 2018  
 
FORECAST IS BASED ON IGNITION TIME OF 1000 CDT ON MAY 17.  
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
 
EAST WINDS WILL BE ON THE INCREASE TODAY WITH GUSTS  
TO AROUND 15 MPH EXPECTED. OTHERWISE, HIGH PRESSURE WILL PROVIDE  
MOSTLY SUNNY SKIES AND DRY WEATHER ACROSS THE REGION RIGHT INTO  
FRIDAY. PLAN ON INCREASING SOUTHEAST WINDS ON FRIDAY. ALSO, BE  
ALERT FOR LOWER RELATIVE HUMIDITIES TODAY. WITH DEEPER MIXING WE  
MAY SEE VALUES DROP INTO THE LOWER 30S TO UPPER 20S THIS  
AFTERNOON.  
   
TODAY
 
 
SKY/WEATHER.........MOSTLY SUNNY.  
TEMPERATURE.........63 AT IGNITION...MAX 75.  
RH..................56 PERCENT AT IGNITION...MIN 37 PERCENT.  
WIND (20 FT)........WINDS EAST AT 7 MPH AT IGNITION....OTHERWISE  
EAST AT 5 TO 8 MPH WITH GUSTS TO 15 MPH.  
CWR.................0 PERCENT.  
MIXING HEIGHT.......1800 FT AGL AT IGNITION...INCREASING TO  
2300-3300 FT AGL LATE IN THE MORNING.  
TRANSPORT WINDS.....EAST 12 TO 16 MPH.  
SMOKE DISPERSAL.....FAIR /25100 KNOT-FT/ AT IGNITION. MAX...GOOD  
/33700 KNOT-FT/.  
 
TIME (CDT) 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM  
SKY (%).........4 10 16 22 26 31 35 28 21  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
CWR.............0 0 0 0 0 0 0 0 0  
TEMP............63 67 70 73 74 75 75 75 73  
RH..............56 49 44 40 38 37 37 38 41  
20 FT WIND DIR..E E E E E E E E E  
20 FT WIND SPD..6 6 6 7 7 7 7 6 6  
20 FT WIND GUST.10 10 10 15 15 15 15 10 10  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLEAR.  
TEMPERATURE.........MIN 47.  
RH..................MAX 83 PERCENT.  
WIND (20 FT)........EAST WINDS 5 TO 7 MPH UNTIL EARLY MORNING  
BECOMING LIGHT, THEN BECOMING EAST 5 TO 6 MPH  
EARLY IN THE MORNING.  
CWR.................0 PERCENT.  
MIXING HEIGHT.......600-2500 FT AGL DECREASING TO 300 FT AGL AFTER  
MIDNIGHT.  
TRANSPORT WINDS.....EAST 9 TO 18 MPH.  
SMOKE DISPERSAL.....POOR TO GOOD (1900-34200 KNOT-FT).  
 
TIME (CDT) 7 PM 9 PM 11 PM 1 AM 3 AM 5 AM  
SKY (%).........14 10 9 7 7 7  
WEATHER COV.....  
WEATHER TYPE....NONE NONE NONE NONE NONE NONE  
TSTM COV........  
CWR.............0 0 0 0 0 0  
TEMP............71 62 55 52 49 47  
RH..............46 58 66 69 77 83  
20 FT WIND......E 6 E 5 E 5 E 5 E 4 E 4  
20 FT WIND GUST.10 5 5  
   
FRIDAY
 
 
SKY/WEATHER.........MOSTLY SUNNY.  
TEMPERATURE.........MAX 78.  
RH..................MIN 37 PERCENT.  
WIND (20 FT)........SOUTHEAST WINDS 5 TO 10 MPH.  
CWR.................0 PERCENT.  
MIXING HEIGHT.......300-2200 FT AGL INCREASING TO 4200-4900 FT AGL.  
TRANSPORT WINDS.....SOUTHEAST 16 TO 22 MPH.  
SMOKE DISPERSAL.....POOR TO GOOD (3400-47400 KNOT-FT) INCREASING TO  
GOOD TO EXCELLENT (56500-86500 KNOT-FT) IN THE  
AFTERNOON.  
 
TIME (CDT) 7 AM 9 AM 11 AM 1 PM 3 PM 5 PM  
SKY (%).........4 6 6 6 9 10  
WEATHER COV.....  
WEATHER TYPE....NONE NONE NONE NONE NONE NONE  
TSTM COV........  
CWR.............0 0 0 0 0 0  
TEMP............50 57 67 74 77 78  
RH..............71 59 48 43 39 37  
20 FT WIND......E 6 E 7 E 8 SE 9 SE 9 SE 9  
20 FT WIND GUST.10 10 15 15 15 15  
 

 
FORECASTER...JW  
REQUESTED BY...BEN HALVERSON  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1810199.0/ARX  
.EMAIL BENJAMIN_HALVERSON@FWS.GOV  
 
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