074  
FNUS73 KDMX 241259  
FWSDMX  
 
SPOT FORECAST FOR OSBORNE WRP...IOWA DNR  
NATIONAL WEATHER SERVICE DES MOINES IA  
759 AM CDT MON APR 24 2017  
 
FORECAST IS BASED ON IGNITION TIME OF 1000 CDT ON APRIL 24.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
 
AN INITIAL OBSERVATION AT IGNITION AND A MID BURN OBSERVATION ARE REQUIRED.  
 
PLEASE RELAY THEM TO THE NATIONAL WEATHER SERVICE FOR EACH PRESCRIBED BURN.  
   
DISCUSSION
 
 
STRONG SOUTH WINDS ARE EXPECTED TODAY AS PRESSURE GRADIENT REMAINS  
TIGHT. STRONGEST WINDS WILL BE IN NORTHERN IOWA WITH GUSTS  
APPROACHING 40 MPH BY AFTERNOON. WINDS WILL BE SOMEWHAT WEAKER IN  
SOUTHERN IOWA BUT STILL A BIT GUSTY BY AFTERNOON. THE STRONG WINDS  
WILL AID IN SMOKE DISPERSION TODAY BUT ALSO MAKE IT MORE DIFFICULT  
TO CONTROL ANY FIRES ONCE THEY GET STARTED. RELATIVE HUMIDITY  
VALUES WILL DROP TO AROUND 30 PERCENT BY MID AFTERNOON.  
   
TODAY
 
 
SKY/WEATHER.........MOSTLY SUNNY (40-50 PERCENT).  
TEMPERATURE.........59 AT IGNITION...MAX 70.  
RH..................47 PERCENT AT IGNITION...MIN 31 PERCENT.  
EYE LEVEL WINDS.....SOUTH WINDS 7 TO 15 MPH INCREASING TO 18 TO 24  
MPH IN THE LATE MORNING AND AFTERNOON.  
WIND (20 FT)........WINDS SOUTH AT 18 MPH AT IGNITION...OTHERWISE  
SOUTH WINDS 7 TO 15 MPH INCREASING TO 18 TO 24  
MPH WITH GUSTS TO AROUND 35 MPH IN THE LATE  
MORNING AND AFTERNOON.  
MIXING HEIGHT.......300-2100 FT AGL INCREASING TO 4600-5000 FT AGL.  
TRANSPORT WINDS.....SOUTH 10 TO 18 MPH INCREASING TO 24 TO 33 MPH  
LATE IN THE MORNING, THEN DECREASING TO 13 TO  
21 MPH LATE IN THE AFTERNOON.  
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED  
FIRE GROWTH AT IGNITION...MAX 6.  
 
TIME (CDT) 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........40 43 47 51 55 58 60 58  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
TEMP............59 62 66 67 68 69 70 70  
RH..............47 41 36 33 32 31 32 32  
20 FT WIND DIR..S S S S S S S S  
20 FT WIND SPD..18 21 22 23 24 24 24 22  
20 FT WIND GUST.25 30 30 30 35 35 35 30  
EYE LVL WND DIR.S S S S S S S S  
EYE LVL WND SPD.11 13 13 14 14 14 14 13  
EYE LVL WND GST.25 30 30 30 35 35 35 30  
MIX HGT (KFT)...3.0 3.5 4.0 4.5 4.7 4.8 5.0 4.6  
MIXNG WIND DIR..S S S S S S S S  
MIXNG WIND SPD..18 24 31 33 29 21 14 13  
HAINES INDEX....4 4 5 5 5 6 6 6  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY (55-65 PERCENT).  
TEMPERATURE.........MIN 50.  
RH..................MAX 83 PERCENT.  
EYE LEVEL WINDS.....SOUTH WINDS 9 TO 18 MPH DECREASING TO AROUND 8  
MPH EARLY IN THE MORNING.  
WIND (20 FT)........SOUTH WINDS 9 TO 18 MPH WITH GUSTS TO AROUND 30  
MPH DECREASING TO AROUND 8 MPH EARLY IN THE  
MORNING.  
MIXING HEIGHT.......2600-4200 FT AGL DECREASING TO 300-1400 FT AGL  
IN THE LATE EVENING AND OVERNIGHT.  
TRANSPORT WINDS.....SOUTHEAST 10 TO 14 MPH.  
HAINES INDEX........2 TO 5 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH TO OR MODERATE POTENTIAL  
FOR LARGE PLUME DOMINATED FIRE GROWTH.  
 
TIME (CDT) 6 PM 9 PM MIDNGT 3 AM  
SKY (%).........55 57 68 62  
WEATHER COV.....  
WEATHER TYPE....NONE NONE NONE NONE  
TSTM COV........  
TEMP............69 60 55 53  
RH..............35 53 64 71  
20 FT WIND......S 18G30 S 13G15 SE 12G15 S 9G10  
EYE LEVEL WIND..S 11G30 S 8G15 SE 7G15 S 5G10  
MIX HGT (FT)....4200 1400 400 300  
MIXNG WIND......SE 13 S 12 S 12 SE 10  
HAINES INDEX....5 5 4 3  
   
TUESDAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY (75-85 PERCENT). ISOLATED RAIN  
SHOWERS EARLY IN THE MORNING. CHANCE OF RAIN  
SHOWERS IN THE LATE MORNING AND AFTERNOON.  
TEMPERATURE.........MAX 66.  
RH..................MIN 61 PERCENT.  
EYE LEVEL WINDS.....EAST WINDS 8 TO 12 MPH.  
WIND (20 FT)........EAST WINDS 8 TO 12 MPH.  
MIXING HEIGHT.......400-2000 FT AGL INCREASING TO 2400-4200 FT AGL  
IN THE AFTERNOON.  
TRANSPORT WINDS.....SOUTHEAST 9 TO 17 MPH INCREASING TO 21 TO 23  
MPH EARLY IN THE AFTERNOON.  
HAINES INDEX........2 TO 3 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
 
TIME (CDT) 6 AM 10 AM 2 PM  
SKY (%).........66 94 93  
WEATHER COV.....ISOLTD CHANCE CHANCE  
WEATHER TYPE....RNSHWR RNSHWR RNSHWR  
TSTM COV........  
TEMP............50 58 64  
RH..............83 69 65  
20 FT WIND......S 8G10 SE 8G10 SE 9G10  
EYE LEVEL WIND..S 5G10 SE 5G10 SE 5G10  
MIX HGT (FT)....400 1700 3200  
MIXNG WIND......S 14 S 9 SE 21  
HAINES INDEX....2 2 3  
 

 
FORECASTER...COGIL  
REQUESTED BY...JUSTIN CLARK  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1707652.0/DMX  
.EMAIL JUSTIN.CLARK@DNR.IOWA.GOV  
 
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