228  
FNUS73 KDVN 191324  
FWSDVN  
 
SPOT FORECAST FOR WAPELLO BOTTOMS...IOWA DNR  
NATIONAL WEATHER SERVICE QUAD CITIES IA/IL  
824 AM CDT FRI APR 19 2019  
 
FORECAST IS BASED ON IGNITION TIME OF 1000 CDT ON APRIL 19.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE  
NATIONAL WEATHER SERVICE QUAD CITIES AT (563) 386-3815.  
   
DISCUSSION
 
 
GUSTY NORTH WINDS AND MINIMUM RELATIVE HUMIDITY VALUES  
IN THE 25 TO 30 PERCENT RANGE WILL LEAD TO AN ENHANCED  
RISK OF SPREADING GRASS FIRES AS THE GFDI GOES INTO THE HIGH  
TO VERY HIGH CATEGORY THIS AFTERNOON OVER FAR EASTERN IOWA  
INTO NORTHWEST ILLINOIS. TONIGHT INTO SATURDAY, HIGH PRESSURE  
PASSING THROUGH THE REGION WILL PROVIDE MOSTLY CLEAR SKIES,  
LIGHT WINDS AND A LOWER RISK FOR SPREADING GRASS FIRES.  
DRY AND WARMER WEATHER IS EXPECTED TO CONTINUE INTO SUNDAY.  
 
THE GRASSLAND FIRE DANGER INDEX -GFDI- DOES NOT ACCOUNT FOR  
PRECIPITATION THAT OCCURS OR ANY SNOW ON THE GROUND. PLEASE  
MAKE APPROPRIATE ADJUSTMENTS.  
 
   
REST OF TODAY
 
 
SKY/WEATHER.........SUNNY (0-5 PERCENT).  
CHANCE OF PCPN......0 PERCENT.  
LAL.................1.  
BEGIN/END OF PCPN...N/A.  
MAX TEMPERATURE.....AROUND 61.  
MIN HUMIDITY........26 PERCENT.  
MAX APPARENT TEMP...61.  
EYE LEVEL WINDS.....NORTH WINDS 10 TO 15 MPH WITH GUSTS TO AROUND  
20 MPH.  
WIND SHIFT..........N/A.  
WIND (20 FT)........NORTH WINDS 15 TO 20 MPH WITH GUSTS TO AROUND  
25 MPH.  
MIXING HEIGHT.......3700-5500 FT AGL INCREASING TO 5800-6400 FT AGL  
LATE IN THE AFTERNOON, THEN DECREASING TO 4300  
FT AGL LATE IN THE AFTERNOON.  
TRANSPORT WINDS.....NORTH 25 TO 30 MPH.  
GFDI................HIGH.  
HAINES INDEX........4 TO 5 OR OR LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH TO OR MODERATE POTENTIAL  
FOR LARGE PLUME DOMINATED FIRE GROWTH.  
 
TIME (CDT) 10 AM NOON 2 PM 4 PM  
SKY (%).........4 2 1 0  
WEATHER COV.....  
WEATHER TYPE....NONE NONE NONE NONE  
TSTM COV........  
CHC OF PCPN (%).0 0 0 0  
LAL.............1 1 1 1  
TEMP............50 54 59 61  
RH..............55 40 29 26  
APARNT TMP (F)..44 55 59 61  
20 FT WIND......N 14 N 16 N 17 N 16  
20 FT WIND GUST.23 30 31 29  
EYE LEVEL WIND..N 11 N 12 N 13 N 12  
EYE LVL WND GST.17 23 23 22  
MIX HGT (FT)....3700 4900 5800 6400  
TRANSPORT WIND..N 32 N 32 N 31 N 30  
GFDI............5 9 13 12  
HAINES INDEX....4 5 5 4  
   
TONIGHT
 
 
SKY/WEATHER.........CLEAR (0-5 PERCENT).  
CHANCE OF PCPN......0 PERCENT.  
LAL.................1.  
BEGIN/END OF PCPN...N/A.  
MIN TEMPERATURE.....AROUND 37.  
MAX HUMIDITY........79 PERCENT.  
MIN APPARENT TEMP...33.  
EYE LEVEL WINDS.....NORTHWEST WINDS UP TO 10 MPH. GUSTS UP TO 25  
MPH EARLY IN THE EVENING.  
WIND SHIFT..........N/A.  
WIND (20 FT)........NORTHWEST WINDS 5 TO 15 MPH. GUSTS UP TO 25 MPH  
EARLY IN THE EVENING.  
MIXING HEIGHT.......2300 FT AGL DECREASING TO 300 FT AGL.  
TRANSPORT WINDS.....NORTH 10 TO 20 MPH DECREASING TO 5 TO 10 MPH IN  
THE LATE EVENING AND OVERNIGHT.  
GFDI................MODERATE.  
HAINES INDEX........4 TO 5 OR OR LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH TO OR MODERATE POTENTIAL  
FOR LARGE PLUME DOMINATED FIRE GROWTH.  
 
TIME (CDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM  
SKY (%).........0 0 0 1 1 1  
WEATHER COV.....  
WEATHER TYPE....NONE NONE NONE NONE NONE NONE  
TSTM COV........  
CHC OF PCPN (%).0 0 0 0 0 0  
LAL.............1 1 1 1 1 1  
TEMP............60 55 49 45 42 39  
RH..............29 38 52 60 67 73  
APARNT TMP (F)..60 55 46 41 38 35  
20 FT WIND......N 13 N 9 N 6 N 6 N 6 N 5  
20 FT WIND GUST.24 14 7 7 7 6  
EYE LEVEL WIND..N 10 N 7 N 4 N 4 N 4 N 4  
EYE LVL WND GST.18 11 5 5 5 5  
MIX HGT (FT)....2300 300 300 300 300 300  
TRANSPORT WIND..N 18 N 10 N 8 N 9 N 8 N 6  
GFDI............8 3 1 1 1 1  
HAINES INDEX....4 4 4 5 5 5  
   
SATURDAY
 
 
SKY/WEATHER.........SUNNY (0-10 PERCENT).  
CHANCE OF PCPN......0 PERCENT.  
LAL.................1.  
BEGIN/END OF PCPN...N/A.  
MAX TEMPERATURE.....AROUND 68.  
MIN HUMIDITY........27 PERCENT.  
MIN APPARENT TEMP...32.  
EYE LEVEL WINDS.....NORTHWEST WINDS UP TO 5 MPH.  
WIND SHIFT..........N/A.  
WIND (20 FT)........NORTHWEST WINDS 5 TO 10 MPH.  
MIXING HEIGHT.......300-2200 FT AGL INCREASING TO 3200-4700 FT AGL  
IN THE AFTERNOON.  
TRANSPORT WINDS.....NORTHWEST 5 TO 15 MPH.  
GFDI................LOW.  
HAINES INDEX........3 TO 4 OR OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH TO OR LOW POTENTIAL FOR  
LARGE PLUME DOMINATED FIRE GROWTH.  
 
TIME (CDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM  
SKY (%).........3 4 3 3 2 1  
WEATHER COV.....  
WEATHER TYPE....NONE NONE NONE NONE NONE NONE  
TSTM COV........  
CHC OF PCPN (%).0 0 0 0 0 0  
LAL.............1 1 1 1 1 1  
TEMP............37 43 55 62 65 68  
RH..............79 65 43 32 29 27  
APARNT TMP (F)..32 39 55 62 65 68  
20 FT WIND......NW 5 NW 5 N 6 NW 6 NW 7 NW 7  
20 FT WIND GUST.6 7 8 9 10 10  
EYE LEVEL WIND..NW 4 NW 4 N 4 NW 4 NW 5 NW 5  
EYE LVL WND GST.5 5 6 7 8 8  
MIX HGT (FT)....300 600 1300 3200 4300 4700  
TRANSPORT WIND..NW 6 NW 7 N 10 NW 13 NW 14 NW 13  
GFDI............0 1 1 2 3 3  
HAINES INDEX....4 4 4 4 4 3  
 

 
FORECASTER...SPECK  
REQUESTED BY...ANDY ROBBINS  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1906591.0/DVN  
.DELDT 04/19/19  
 
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