707  
FNUS73 KOAX 141246  
FWSOAX  
 
SPOT FORECAST FOR BOTNA BOTTOMS - DENG TRACT...IOWA DNR  
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE  
746 AM CDT WED APR 14 2021  
 
FORECAST IS BASED ON IGNITION TIME OF 0900 CDT ON APRIL 14.  
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
 
WINDS WILL BE THE MAIN FIRE-RELATED CONCERN TODAY, THOUGH NOT  
QUITE AS MUCH AS PAST DAYS. EXPECT SUSTAINED SPEEDS 10-15 MPH  
OUT OF THE NORTHWEST BY IGNITION TIME, LASTING THROUGH MUCH OF  
THIS AFTERNOON. SOME GUSTS OF 20 TO 25 MPH WILL ALSO BE POSSIBLE,  
ESPECIALLY LATE THIS MORNING INTO EARLY TO MID-AFTERNOON.  
TEMPERATURES IN THE MID 30S THIS MORNING SHOULD CLIMB INTO THE  
LOWER 50S THIS AFTERNOON WITH MINIMUM RH VALUES RIGHT AROUND 40  
PERCENT. EXPECT GOOD TO EXCELLENT SMOKE DISPERSAL WITH MIXING  
HEIGHTS INCREASING FROM 2400 FT NEAR IGNITION TIME TO OVER 4000  
FT BY THIS AFTERNOON.  
 
THURSDAY WILL SEE SIMILAR TEMPERATURES WITH HIGHER MINIMUM RH  
VALUES IN THE MID 40S AND LIGHTER NORTHERLY WINDS GENERALLY UNDER  
10 MPH. GIVEN THE LIGHTER WINDS, MIXING HEIGHTS WILL BE A LITTLE  
LOWER, SO SMOKE DISPERSAL MAY BE A BIT WORSE, BUT STILL BECOMING  
"GOOD" BY THE AFTERNOON.  
   
TODAY
 
 
SKY/WEATHER.........MOSTLY SUNNY (20-30 PERCENT).  
MAX TEMPERATURE.....AROUND 54.  
MIN HUMIDITY........35 PERCENT.  
EYE LEVEL WINDS.....NORTHWEST WINDS 6 TO 8 MPH. GUSTS UP TO 23 MPH  
IN THE LATE MORNING AND AFTERNOON.  
SURFACE WINDS (MPH).NORTHWEST WINDS 10 TO 14 MPH. GUSTS UP TO 23  
MPH IN THE LATE MORNING AND AFTERNOON.  
WIND (20 FT)........NORTHWEST WINDS 9 TO 12 MPH. GUSTS UP TO 23 MPH  
IN THE LATE MORNING AND AFTERNOON.  
MIXING HEIGHT.......4600 FT AGL.  
TRANSPORT WINDS.....NORTHWEST 9 TO 22 MPH INCREASING TO 18 TO 21  
MPH IN THE AFTERNOON.  
SMOKE DISPERSAL.....GOOD (37900 KNOT-FT) EARLY IN THE MORNING  
INCREASING TO EXCELLENT (78300 KNOT-FT) IN THE  
AFTERNOON.  
GFDI................MODERATE.  
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
 
TIME (CDT) 9 AM 11 AM 1 PM 3 PM 5 PM  
SKY (%).........5 12 24 32 47  
WEATHER COV.....  
WEATHER TYPE....NONE NONE NONE NONE NONE  
TSTM COV........  
TEMP............38 45 50 53 54  
RH..............62 47 39 36 35  
20 FT WIND......NW 8 NW 11 NW 11 NW 10 NW 10  
20 FT WIND GUST.14 18 17 17 16  
EYE LEVEL WIND..NW 6 NW 8 NW 8 NW 8 NW 8  
EYE LVL WND GST.11 14 13 13 12  
SURFACE WIND....NW 10 NW 14 NW 14 NW 13 NW 13  
SURFACE WND GST.18 23 21 21 20  
MIX HGT (FT)....2400 2800 3600 4300 4600  
TRANSPORT WIND..NW 21 NW 22 NW 20 NW 20 N 18  
GFDI............2 4 4 4 5  
HAINES INDEX....3 3 3 3 3  
SDSPL KT-FT/1K..38 56 62 76 76  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY (55-65 PERCENT) THEN BECOMING  
PARTLY CLOUDY (25-35 PERCENT) THEN BECOMING  
MOSTLY CLEAR (0-10 PERCENT). AREAS OF FROST  
AFTER 3 AM. WIDESPREAD FROST EARLY IN THE  
MORNING.  
MIN TEMPERATURE.....AROUND 32.  
MAX HUMIDITY........92 PERCENT.  
EYE LEVEL WINDS.....NORTH WINDS 7 TO 8 MPH BECOMING LIGHT.  
SURFACE WINDS (MPH).NORTHWEST WINDS 6 TO 13 MPH IN THE EVENING  
BECOMING LIGHT.  
WIND (20 FT)........NORTHWEST WINDS 5 TO 10 MPH IN THE EVENING  
BECOMING LIGHT.  
MIXING HEIGHT.......400 FT AGL.  
TRANSPORT WINDS.....NORTHWEST 3 TO 17 MPH SHIFTING TO THE NORTH 5  
TO 9 MPH IN THE LATE EVENING AND OVERNIGHT.  
SMOKE DISPERSAL.....EXCELLENT (69500 KNOT-FT) EARLY IN THE EVENING  
DECREASING TO POOR (0 KNOT-FT) LATE IN THE  
NIGHT.  
GFDI................LOW.  
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 (%).........57 60 30 19 5 6  
WEATHER COV..... AREAS  
WEATHER TYPE....NONE NONE NONE NONE NONE FROST  
TSTM COV........  
TEMP............53 49 45 41 38 35  
RH..............36 44 53 65 73 82  
20 FT WIND......N 10 N 8 NW 5 NW 4 NW 4 N 4  
20 FT WIND GUST.14 12 6 5 5 6  
EYE LEVEL WIND..N 8 N 6 NW 4 NW 3 NW 3 N 3  
EYE LVL WND GST.11 9 5 4 4 4  
SURFACE WIND....N 13 N 10 NW 6 NW 5 NW 5 N 5  
SURFACE WND GST.18 15 8 6 6 7  
MIX HGT (FT)....4500 1300 800 400 400 400  
TRANSPORT WIND..N 18 N 12 N 6 N 5 N 6 N 6  
GFDI............4 3 1 1 1 1  
HAINES INDEX....3 2 2 2 2 2  
SDSPL KT-FT/1K..70 40 4 0 2 2  
   
THURSDAY
 
 
SKY/WEATHER.........MOSTLY SUNNY (25-35 PERCENT). WIDESPREAD FROST  
EARLY IN THE MORNING, THEN AREAS OF FROST EARLY  
IN THE MORNING.  
MAX TEMPERATURE.....AROUND 57.  
MIN HUMIDITY........40 PERCENT.  
EYE LEVEL WINDS.....NORTH WINDS AROUND 4 MPH EARLY IN THE MORNING  
BECOMING LIGHT, THEN BECOMING NORTH UP TO 5 MPH  
IN THE LATE MORNING AND AFTERNOON.  
SURFACE WINDS (MPH).NORTH WINDS AROUND 6 MPH EARLY IN THE MORNING  
BECOMING LIGHT, THEN BECOMING NORTH 8 TO 9 MPH  
IN THE LATE MORNING AND AFTERNOON.  
WIND (20 FT)........NORTH WINDS AROUND 5 MPH EARLY IN THE MORNING  
BECOMING LIGHT, THEN BECOMING WEST 6 TO 8 MPH  
IN THE LATE MORNING AND AFTERNOON.  
MIXING HEIGHT.......4300 FT AGL.  
TRANSPORT WINDS.....SOUTHWEST 5 TO 12 MPH.  
SMOKE DISPERSAL.....POOR (0 KNOT-FT) EARLY IN THE MORNING  
INCREASING TO GOOD (37600 KNOT-FT) IN THE  
AFTERNOON.  
GFDI................LOW.  
HAINES INDEX........2 TO 3 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
 
TIME (CDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM  
SKY (%).........5 2 22 44 51 55  
WEATHER COV.....WIDSPD AREAS  
WEATHER TYPE....FROST FROST NONE NONE NONE NONE  
TSTM COV........  
TEMP............33 35 45 50 55 57  
RH..............85 85 62 54 45 40  
20 FT WIND......N 5 N 4 N 6 N 7 N 7 N 7  
20 FT WIND GUST.6 6 8 10 10 10  
EYE LEVEL WIND..N 4 N 3 N 4 N 5 N 5 N 5  
EYE LVL WND GST. 5 6 8 8 7  
SURFACE WIND....N 6 N 5 N 8 N 9 N 9 N 9  
SURFACE WND GST.7 8 10 13 13 12  
MIX HGT (FT)....400 600 2700 3600 4000 4300  
TRANSPORT WIND..N 5 N 5 N 10 N 8 N 10 N 7  
GFDI............1 1 1 2 2 2  
HAINES INDEX....2 3 3 3 3 3  
SDSPL KT-FT/1K..0 8 24 36 35 26  
 

 
FORECASTER...PETERSEN  
REQUESTED BY...MATT DOLLISON  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2109024.0/OAX  
.DELDT 04/14/21  
.FORMATTERVERSION 1.0.26  
 
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