A thunderstorm produced 60 mph wind gusts near Kingsley in Plymouth County of northwest Iowa on the afternoon of July 29th.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS FSD wrote it up.
A thunderstorm produced 60 mph wind gusts near Kingsley in Plymouth County of northwest Iowa on the afternoon of July 29th.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Sioux Falls, SD wrote its last area forecast discussion before the first event at Jul 29, 2:00 PM CST, 34 minutes earlier.
AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA NATIONAL WEATHER SERVICE SIOUX FALLS SD 300 PM CDT WED JUL 29 2009 .DISCUSSION... FAIRLY STRONG NORTHWEST FLOW WAVE DRAGGING COOLER AND WETTER CONDITIONS THROUGH THE AREA TODAY. THE BETTER FOCUS IN THE LOW TO MID LEVELS WILL SHIFT INTO THE FAR EASTERN CWA THIS EVENING...THEN EAST OF THE AREA BY ABOUT 3-6Z. A MINOR AMOUNT OF INSTABILITY AND A WEAK BOUNDARY OVER PARTS OF NW IA MAY AID IN FOCUSING A FEW THUNDERSTORMS WITH SMALL HAIL AND WIND GUSTS TO 40 MPH THROUGH ABOUT 1Z. BEHIND THIS WILL BE DEALING WITH MAINLY THE UPPER LEVEL SUPPORT AND COLD POOL WHICH COULD STILL INITIATE SOME SPOTTY...ISOLATED SHOWERS THROUGH THE NIGHT. SO...POPS WILL REMAIN IN THE ISOLATED TO SCATTERED CATEGORY BEHIND THE MAIN AREA OF RAINFALL....AND THEN GO TO 10 PERCENT OR LESS IN THE SW CWA AFTER ABOUT 6Z. AS FOR TEMPERATURES...EVEN WITH COOLER AIR ADVECTING IN...WILL LEAN TOWARDS THE WARM SIDE OF GUIDANCE...ESPECIALLY IN THE EAST WHERE CLOUDS LIKELY TO HANG ON MOST...IF NOT ALL... OF THE NIGHT. SO...GENERALLY LOWS RANGING FROM THE UPPER 50S EAST TO THE LOWER 50S WEST. && .AVIATION... LOW END VFR CEILINGS TO OCCASIONAL MVFR CEILINGS IN RAINFALL LATE THIS AFTERNOON AND EVENING. STEADY RAINFALL SHOULD SHIFT EAST OF THE TAF SITES BY EARLY EVENING WITH SPOTTY SHOWERS THEREAFTER. THE VISIBILITY WILL GENERALLY REMAIN VFR WITH AN OCCASIONAL MVFR IN HEAVIER RAINFALL. BY LATE TONIGHT INTO TOMORROW MORNING...MAINLY BROKEN VFR EXPECTED...ALTHOUGH BY 15-16Z SOME SPOTTY MVFR CEILINGS POSSIBLE WITH A FEW SHOWERS AFTER ABOUT 17Z AS WELL...ESPECIALLY NORTH OF A HURON TO SPENCER IOWA LINE. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. IA...NONE. NE...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SIOUX FALLS SD 1135 AM CDT WED JUL 29 2009 SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098- IAZ001>003-012>014-020>022-031-032-NEZ013-014-301200- AURORA-BEADLE-BON HOMME-BROOKINGS-BRULE-BUENA VISTA IA- CHARLES MIX-CHEROKEE IA-CLAY-CLAY IA-COTTONWOOD MN-DAKOTA NE- DAVISON-DICKINSON IA-DIXON NE-DOUGLAS-GREGORY-HANSON-HUTCHINSON- IDA IA-JACKSON MN-JERAULD-KINGSBURY-LAKE-LINCOLN-LINCOLN MN- LYON IA-LYON MN-MCCOOK-MINER-MINNEHAHA-MOODY-MURRAY MN-NOBLES MN- OBRIEN IA-OSCEOLA IA-PIPESTONE MN-PLYMOUTH IA-ROCK MN-SANBORN- SIOUX IA-TURNER-UNION-WOODBURY IA-YANKTON- 1135 AM CDT WED JUL 29 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA... SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS... SHOWERS AND A FEW EMBEDDED THUNDERSTORMS WILL SPREAD EAST ACROSS THE REGION THROUGH TONIGHT. NO SEVERE WEATHER IS EXPECTED WITH THIS ACTIVITY. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THERE IS A CHANCE OF THUNDERSTORMS ACROSS THE AREA AGAIN FRIDAY NIGHT INTO SATURDAY MORNING. NO SEVERE WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT. && FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT WWW.WEATHER.GOV/SIOUXFALLS. THIS INCLUDES THE GRAPHICAL HAZARDOUS WEATHER OUTLOOK.
The Sioux Falls radar (KFSD), 123 km away, was scanning. The volume nearest the first event began at 20:32 UTC.
1 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds caused an unknown amount of tree damage.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Iowa in 2009Every state in 2009This day in weather historyWarnings in Iowa, July 2009
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 190218.