012  
FNUS73 KOAX 310921  
FWSOAX  
 
SPOT FORECAST FOR LHPS GRASS EVENT 2024...IOWA DNR  
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE  
421 AM CDT FRI MAY 31 2024  
 
FORECAST IS BASED ON IGNITION TIME OF 0800 CDT ON MAY 31.  
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
 
ONGOING SHOWERS AND STORMS ARE ON A DOWNWARD TREND WHICH SHOULD  
GIVE A MOSTLY DRY PERIOD THIS MORNING, BUT CAN'T COMPLETELY RULE  
OUT A STRAY SHOWER MOVING THROUGH IN THE 8 AM TO NOON WINDOW.  
AFTER THAT, EXPECT SCATTERED STORMS TO REDEVELOP, AND WHILE THERE  
WILL LIKELY BE GAPS BETWEEN STORMS, THERE'S A 60-70 PERCENT CHANCE  
OF A STORM MOVING THROUGH AT SOME POINT IN THE AFTERNOON.  
OTHERWISE, EXPECT TEMPERATURE AT IGNITION TO BE AROUND 63 DEGREES  
WITH RH AROUND 93 PERCENT. WINDS SHOULD BE OUT OF THE SOUTHEAST  
AT 5 TO 10 MPH WITH A FEW GUSTS OF 15 TO 20 MPH, THOUGH SPEED AND  
DIRECTION COULD BE LITTLE ERRATIC WITH ANY STORM THAT PASSES  
THROUGH. EXPECT A HIGH TEMPERATURE OF 75 AND A MINIMUM RH AROUND  
72 PERCENT.  
 
SATURDAY LOOKS DRIER WITH RAIN CHANCES LIKELY HOLDING OFF UNTIL  
THE LATE EVENING HOURS. EXPECT FAIRLY SIMILAR TEMPERATURES AND RH  
VALUES DIPPING INTO THE 40S. WINDS WILL BE OUT OF THE NORTHWEST  
THROUGH MID-AFTERNOON BEFORE BECOMING SOUTHERLY BY LATE  
AFTERNOON/EARLY EVENING.  
 
STRONGEST POSSIBLE WIND SPEEDS ON DAY OF BURN: 35 MPH, WOULD LIKELY  
BE ASSOCIATED WITH SHOWERS/STORMS  
 
LOWEST POSSIBLE RELATIVE HUMIDITY ON DAY OF BURN: 50%  
   
REST OF TODAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY (80-90 PERCENT). CHANCE OF  
SHOWERS EARLY IN THE MORNING. CHANCE OF  
THUNDERSTORMS THROUGH THE DAY. SHOWERS LIKELY  
IN THE AFTERNOON.  
MAX TEMPERATURE.....AROUND 75.  
MIN HUMIDITY........72 PERCENT.  
EYE LEVEL WINDS.....LIGHT WINDS BECOMING SOUTHEAST UP TO 6 MPH WITH  
GUSTS TO AROUND 12 MPH IN THE LATE MORNING AND  
AFTERNOON.  
SURFACE WINDS (MPH).LIGHT WINDS BECOMING SOUTHEAST 6 TO 10 MPH WITH  
GUSTS TO AROUND 20 MPH IN THE LATE MORNING AND  
AFTERNOON.  
WIND (20 FT)........LIGHT WINDS BECOMING SOUTHEAST 5 TO 9 MPH WITH  
GUSTS TO AROUND 16 MPH IN THE LATE MORNING AND  
AFTERNOON. GUSTY AND ERRATIC WINDS EXPECTED  
NEAR THUNDERSTORMS EARLY IN THE MORNING. GUSTY  
AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS  
IN THE LATE MORNING AND AFTERNOON.  
MIXING HEIGHT.......3400 FT AGL.  
TRANSPORT WINDS.....SOUTHEAST 13 TO 16 MPH.  
SMOKE DISPERSAL.....FAIR (13800 KNOT-FT) EARLY IN THE MORNING  
INCREASING TO GOOD (42000 KNOT-FT) IN THE  
AFTERNOON.  
GFDI................0.  
HAINES INDEX........3 TO 4 OR VERY LOW TO LOW POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
 
TIME (CDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........83 81 92 78 83 87 90 89 92 90  
WEATHER COV.....SCH CHC CHC CHC CHC LKY LKY LKY LKY LKY  
WEATHER TYPE....RW RW RW RW RW RW RW RW RW RW  
TSTM COV........SCH CHC CHC CHC CHC CHC CHC CHC CHC CHC  
TEMP............63 65 68 71 72 72 73 71 71 71  
RH..............96 93 81 76 77 74 72 75 76 76  
20 FT WIND DIR..SE SE SE SE SE SE SE SE SE SE  
20 FT WIND SPD..4 5 6 7 8 8 8 8 8 7  
20 FT WIND GUST.8 10 11 13 14 16 16 16 14 14  
EYE LVL WND DIR.SE SE SE SE SE SE SE SE SE SE  
EYE LVL WND SPD.3 4 4 5 6 6 6 6 6 5  
EYE LVL WND GST.6 7 8 10 10 12 12 12 11 10  
SURFACE WND DIR.SE SE SE SE SE SE SE SE SE SE  
SURFACE WND SPD.5 6 8 9 10 10 10 10 10 9  
SURFACE WND GST.10 12 14 16 17 20 20 20 18 17  
MIX HGT (KFT)...1.1 1.7 2.5 2.5 3.4 3.2 2.9 2.7 2.4 2.1  
TRANSP WIND DIR.SE SE SE SE SE SE SE SE SE SE  
TRANSP WIND SPD.13 13 14 15 16 15 16 16 14 13  
GFDI............0 0 0 0 0 0 0 0 0 0  
HAINES INDEX....4 4 4 4 4 3 3 3 3 3  
SDSPL KT-FT/100014 22 30 36 41 42 39 34 29 25  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY (80-90 PERCENT). SHOWERS LIKELY  
AND CHANCE OF THUNDERSTORMS IN THE EVENING,  
THEN CHANCE OF SHOWERS AND SLIGHT CHANCE OF  
THUNDERSTORMS OVERNIGHT.  
MIN TEMPERATURE.....AROUND 59.  
MAX HUMIDITY........100 PERCENT.  
EYE LEVEL WINDS.....SOUTHEAST WINDS AROUND 4 MPH EARLY IN THE  
EVENING BECOMING LIGHT.  
SURFACE WINDS (MPH).SOUTHEAST WINDS AROUND 8 MPH DECREASING TO 6 TO  
8 MPH EARLY IN THE EVENING, THEN BECOMING LIGHT  
IN THE LATE EVENING AND OVERNIGHT.  
WIND (20 FT)........SOUTHEAST WINDS AROUND 7 MPH DECREASING TO 5 TO  
6 MPH EARLY IN THE EVENING, THEN BECOMING LIGHT  
IN THE LATE EVENING AND OVERNIGHT. GUSTY AND  
ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS EARLY  
IN THE EVENING. GUSTY AND ERRATIC WINDS  
EXPECTED NEAR THUNDERSTORMS IN THE LATE EVENING  
AND OVERNIGHT.  
MIXING HEIGHT.......600 FT AGL.  
TRANSPORT WINDS.....SOUTHEAST 7 TO 14 MPH SHIFTING TO THE SOUTHWEST  
AROUND 7 MPH EARLY IN THE MORNING.  
SMOKE DISPERSAL.....FAIR (22000 KNOT-FT) EARLY IN THE EVENING  
DECREASING TO POOR (3200 KNOT-FT) LATE IN THE  
NIGHT.  
GFDI................0.  
HAINES INDEX........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 (%).........91 87 95 89 82 76  
WEATHER COV.....LIKELY LIKELY LIKELY CHANCE S CHC  
WEATHER TYPE....RNSHWR RNSHWR RNSHWR RNSHWR RNSHWR NONE  
TSTM COV........CHANCE CHANCE S CHC S CHC S CHC  
TEMP............70 68 64 63 62 61  
RH..............76 78 90 93 93 98  
20 FT WIND......SE 6 SE 5 SE 4 SE 3 S 2 SW 2  
20 FT WIND GUST.13 10 7 6 6 6  
EYE LEVEL WIND..SE 4 SE 4 SE 3 SE 2 S 1 SW 1  
EYE LVL WND GST.10 7 5 4 4 4  
SURFACE WIND....SE 8 SE 6 SE 5 SE 4 S 3 SW 3  
SURFACE WND GST.16 12 9 7 7 7  
MIX HGT (FT)....1900 1100 600 700 700 600  
TRANSPORT WIND..SE 14 SE 10 SE 8 S 8 S 9 S 8  
GFDI............0 0 0 0 0 0  
HAINES INDEX....3 3 3 3 3 3  
SDSPL KT-FT/100022 13 4 4 4 4  
   
SATURDAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT) THEN BECOMING  
MOSTLY SUNNY (35-45 PERCENT).  
MAX TEMPERATURE.....AROUND 79.  
MIN HUMIDITY........49 PERCENT.  
EYE LEVEL WINDS.....LIGHT WINDS BECOMING NORTHWEST AROUND 4 MPH  
LATE IN THE MORNING, THEN BECOMING LIGHT LATE  
IN THE AFTERNOON.  
SURFACE WINDS (MPH).LIGHT WINDS BECOMING NORTHWEST AROUND 6 MPH  
LATE IN THE MORNING, THEN BECOMING LIGHT LATE  
IN THE AFTERNOON.  
WIND (20 FT)........LIGHT WINDS BECOMING NORTHWEST AROUND 5 MPH  
LATE IN THE MORNING, THEN BECOMING LIGHT LATE  
IN THE AFTERNOON.  
MIXING HEIGHT.......5000 FT AGL.  
TRANSPORT WINDS.....WEST AROUND 7 MPH SHIFTING TO THE NORTHWEST,  
THEN SHIFTING TO THE WEST AROUND 8 MPH LATE IN  
THE AFTERNOON.  
SMOKE DISPERSAL.....POOR (7800 KNOT-FT) EARLY IN THE MORNING  
INCREASING TO GOOD (37700 KNOT-FT) IN THE  
AFTERNOON.  
GFDI................0.  
HAINES INDEX........3 TO 4 OR VERY LOW TO LOW POTENTIAL FOR LARGE  
PLUME DOMINATED FIRE GROWTH.  
 
TIME (CDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM  
SKY (%).........78 77 71 50 33 32  
WEATHER COV.....  
WEATHER TYPE....NONE NONE NONE NONE NONE NONE  
TSTM COV........  
TEMP............59 61 67 72 76 77  
RH..............100 99 84 68 61 53  
20 FT WIND......W 2 NW 3 NW 4 NW 5 NW 5 W 4  
20 FT WIND GUST.6 6 7 10 10 8  
EYE LEVEL WIND..W 1 NW 2 NW 3 NW 4 NW 4 W 3  
EYE LVL WND GST.4 4 5 7 7 6  
SURFACE WIND....W 3 NW 4 NW 5 NW 6 NW 6 W 5  
SURFACE WND GST.7 7 9 12 12 10  
MIX HGT (FT)....700 1100 2000 3300 4600 5000  
TRANSPORT WIND..W 7 W 12 NW 12 NW 10 N 12 W 8  
GFDI............0 0 0 0 0 0  
HAINES INDEX....3 3 3 3 4 4  
SDSPL KT-FT/10008 13 20 32 38 35  
 

 
FORECASTER...CA  
REQUESTED BY...KODY WOHLERS  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2415388.0/OAX  
.DELDT 05/31/24  
.FORMATTERVERSION 2.0.0  
.EMAIL KWOHLERS@INHF.ORG  
 
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