573  
FNUS73 KDMX 230848  
FWSDMX  
 
SPOT FORECAST FOR PRAIRIE POINT CROSSING...CITY OF JOHNSTON  
NATIONAL WEATHER SERVICE DES MOINES IA  
348 AM CDT THU MAR 23 2017  
 
FORECAST IS BASED ON IGNITION TIME OF 0800 CDT ON MARCH 23.  
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
 
 
A WARM FRONT WILL LIFT INTO IOWA TODAY AND WILL BRING LIGHT  
SHOWERS TO THE AREA TODAY AND POSSIBLY A THUNDERSTORM. BY THIS  
AFTERNOON, ANY PRECIPITATION IS EXPECTED TO BE FOCUSED NORTH OF  
HIGHWAY 30. THE WIND WILL BE BREEZY FROM THE SOUTHEAST.  
   
TODAY
 
 
SKY/WEATHER.........CLOUDY (85-95 PERCENT). ISOLATED RAIN SHOWERS  
LATE IN THE MORNING. SCATTERED RAIN SHOWERS  
EARLY IN THE AFTERNOON, THEN ISOLATED RAIN  
SHOWERS LATE IN THE AFTERNOON.  
MAX TEMPERATURE.....AROUND 59.  
MIN HUMIDITY........39 PERCENT.  
EYE LEVEL WINDS.....SOUTHEAST WINDS 10 TO 13 MPH.  
WIND (20 FT)........SOUTHEAST WINDS 10 TO 13 MPH.  
MIXING HEIGHT.......1700-2500 FT AGL.  
TRANSPORT WINDS.....SOUTHEAST 17 TO 24 MPH.  
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
 
TIME (CDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........97 96 94 94 95 95 89 84 79 76  
WEATHER COV..... ISO ISO ISO SCT SCT SCT ISO  
WEATHER TYPE.... RW RW RW RW RW RW RW  
TSTM COV........  
TEMP............41 42 43 45 46 48 50 52 55 56  
RH..............57 60 62 62 65 65 63 63 59 62  
20 FT WIND DIR..SE SE SE SE SE SE SE SE SE SE  
20 FT WIND SPD..12 12 13 13 13 13 13 13 13 13  
20 FT WIND GUST.15 15 15 15 15 15 15 15 15 15  
EYE LVL WND DIR.SE SE SE SE SE SE SE SE SE SE  
EYE LVL WND SPD.7 7 8 8 8 8 8 8 8 8  
EYE LVL WND GST.15 15 15 15 15 15 15 15 15 15  
MIX HGT (KFT)...2.0 2.1 2.2 2.3 2.4 2.5 2.4 2.4 2.4 2.5  
MIXNG WIND DIR..SE SE SE SE SE SE SE SE SE SE  
MIXNG WIND SPD..20 22 23 24 24 24 23 22 20 17  
HAINES INDEX....2 2 2 2 2 2 2 2 2 2  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT).  
MIN TEMPERATURE.....AROUND 53.  
MAX HUMIDITY........80 PERCENT.  
EYE LEVEL WINDS.....SOUTH WINDS 9 TO 13 MPH.  
WIND (20 FT)........SOUTH WINDS 9 TO 13 MPH.  
MIXING HEIGHT.......900-2700 FT AGL DECREASING TO 300-600 FT AGL  
AFTER MIDNIGHT.  
TRANSPORT WINDS.....SOUTHEAST 7 TO 15 MPH.  
HAINES INDEX........2 TO 3 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
 
TIME (CDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM  
SKY (%).........74 71 71 68 66 65  
WEATHER COV.....  
WEATHER TYPE....NONE NONE NONE NONE NONE NONE  
TSTM COV........  
TEMP............58 59 56 54 53 53  
RH..............59 57 66 71 74 77  
20 FT WIND......SE 13 SE 10 SE 9 S 9 S 9 S 9  
20 FT WIND GUST.15 15 10 10 10 10  
EYE LEVEL WIND..SE 8 SE 6 SE 5 S 5 S 5 S 5  
EYE LVL WND GST.15 15 10 10 10 10  
MIX HGT (FT)....2600 2200 1200 600 300 300  
MIXNG WIND......SE 15 SE 13 SE 12 SE 8 SE 7 SE 7  
HAINES INDEX....2 2 2 3 3 3  
   
FRIDAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY (80-90 PERCENT). RAIN LIKELY.  
SLIGHT CHANCE OF THUNDERSTORMS LATE IN THE  
AFTERNOON.  
MAX TEMPERATURE.....AROUND 67.  
MIN HUMIDITY........59 PERCENT.  
EYE LEVEL WINDS.....SOUTH WINDS 8 TO 9 MPH.  
WIND (20 FT)........SOUTH WINDS 8 TO 9 MPH. GUSTY AND ERRATIC WINDS  
EXPECTED NEAR THUNDERSTORMS LATE IN THE  
AFTERNOON.  
MIXING HEIGHT.......300-1800 FT AGL INCREASING TO 2500-3900 FT AGL  
IN THE AFTERNOON.  
TRANSPORT WINDS.....SOUTH 9 TO 14 MPH.  
HAINES INDEX........2 TO 3 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
 
TIME (CDT) 6 AM 9 AM NOON 3 PM  
SKY (%).........80 90 90 91  
WEATHER COV..... LIKELY LIKELY LIKELY  
WEATHER TYPE....NONE RAIN RAIN RAIN  
TSTM COV........  
TEMP............54 58 62 66  
RH..............77 72 67 61  
20 FT WIND......S 8G10 S 9G15 S 9G15 S 9G15  
EYE LEVEL WIND..S 5G10 S 5G15 S 5G15 S 5G15  
MIX HGT (FT)....300 900 2500 3700  
MIXNG WIND......SE 9 S 13 SE 10 S 13  
HAINES INDEX....3 2 3 3  
 

 
FORECASTER...DONAVON  
REQUESTED BY...KARI ALLEN  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1704980.0/DMX  
.EMAIL KALLEN@CITYOFJOHNSTON.COM  
 
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