Tornadoes and Hail in Iowa, June 21, 2007

Name: Tornadoes and Hail in Iowa, June 21, 2007
Start: 2007-06-21T13:31
End: 2007-06-21T18:52
Location: Iowa

June 21, 2007 · NWS DMX · 66 events in 24 counties and zones

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: $465,000
Crop damage: $244,000
Events: 66

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.

What happened

The episode as NWS DMX wrote it up.

A warm, moist, and unstable airmass was in place over Iowa on the afternoon of the 21st. A Warm front lifted north into the state with temperatures rising into the upper 80s to low 90s south of it with dew point temperatures in the upper 60s to low 70s. This combination produced most unstable CAPE values in the 3000 to 4000 J/kg range and lifted indices in the -9 C. range. The environment was not strongly sheared with 25 to 35 kts of effective shear. The freezing level was quite high at 14,700 feet. In spite of this, there was plenty of cape in the -10 to -30 C. layer of the atmosphere, with 500 J/kg available. The LFC in the 1200 to 2000 meter range. The MCS developed rapidly and move east-southeast across Iowa. Many of the storms produced significant hail, with hail size ranging from nickel to over tennis ball size. Two and one half inch diameter hail fell north of Renwick in Humboldt County. Golf ball size hail fell in Hancock County in the Corwith area. The largest hail occurred during the first couple hours of the systems development. Most of the hail was in the three quarter to one inch diameter range later on. Four tornadoes were reported with the system. All of the were brief touchdowns however and caused little damage. One touched down in Wright County near Eagle Grove. Two others touched down in Butler County one west of Shell Rock, the other north of Steamboat Rock. The fourth tornado touched down northwest of Kelly in Story County. The final tornado touched down on the south side of Waterloo in Black Hawk County. Many of the storms produced strong winds of at least 45 to 50 MPH. There were several reports of winds in excess of 60 MPH however. Numerous trees were blown down and a few power poles snapped. Winds caused damage in the Poweshiek County with winds estemated at near 80 MPH.

What forecasters said that day

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 Des Moines, IA wrote its last area forecast discussion before the first event at Jun 21, 3:03 AM CST, 10 hours 28 minutes earlier.

Area forecast discussion, Jun 21, 3:03 AM CST, 10 hours 28 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DES MOINES IA
403 AM CDT THU JUN 21 2007

.DISCUSSION...

SFC BOUNDARY NOW EXTENDING FROM SOUTHERN MN THROUGH CNTRL SD WITH
CONVECTION SCATTERED ACROSS THIS AREA. ACTIVITY HAS BEEN PERSISTENT
OVER SE MN WHILE ONSET WAS DELAYED OVER THE DAKOTAS DESPITE EXTREME
INSTABILITIES THIS EVENING. THE INTENSIFYING LLJ AND AN UPPER LEVEL
SHORT WAVE SPILLING OVER THE MONTANA ROCKIES HAS ALLOWED THE
CONVECTION TO BLOSSOM OVER THE PAST HOUR. STRONG MOISTURE TRANSPORT
HAS OCCURRED OVER WESTERN IA OVERNIGHT AND THIS REGION HAS BECOME
QUITE UNSTABLE WITH MUCAPES NOW OVER 3000 J/KG AND SHOWALTERS AT
-9C. CURRENTLY LACKING A TRIGGER TO RELEASE THIS ENERGY THOUGH A
FAIR AMOUNT OF ALTO CUMULUS HAS DEVELOPED IN THE REGION.

STILL A FAIR AMOUNT OF UNCERTAINTY ON HOW THE NEXT 48 HRS WILL PLAY
OUT AS THE BOUNDARY PLACEMENT DURING THE PERIOD IS STILL NOT A
GIVEN. THE 00Z SPC 4KM WRF...LATEST RUC AND 00Z GFS ALL SUGGEST THE
BOUNDARY WILL SETTLE INTO NORTH CENTRAL IA SOMETIME THIS AFTERNOON
WHICH WOULD PLACE THIS AREA UNDER THE HIGHEST RISK FOR CONVECTIVE
DEVELOPMENT. UNDER THIS SCENARIO...SEVERE WEATHER WOULD BE LIKELY
WITH VERY LARGE HAIL...DAMAGING WINDS AND ISOLATED TORNADOES ALL
POSSIBLE. OTHER FACTORS INCLUDE THE MCS THAT IS FORMING OVER THE
DAKOTAS. THIS ACTIVITY SHOULD EVENTUALLY BECOME ROOTED AND SHOULD
DIVE SOUTHEAST TOWARD THE INSTABILITY AXIS AND INTO SOUTHERN MN AND
NORTHERN IA. SEE LITTLE THAT WOULD PREVENT THIS COMPLEX FROM BEING
SEVERE MUCH OF THE DAY AS IT PUSHES TO THE EAST/SOUTHEAST. WILL
MENTION POTENTIAL SEVERE STORMS AND HEAVY RAIN OVER THE NORTHERN
HALF FOR TONIGHT. COULD HAVE REPEATED THUNDERSTORMS OVER THE NORTH
WITH CONTINUED BACK BUILDING OF STORMS. THE PRIMARY UPPER LEVEL
SYSTEM ARRIVES FRIDAY AND WILL PASS SLOWLY OVER CENTRAL IA THROUGH
FRIDAY NIGHT. THIS SYSTEM CONTINUES TO APPEAR TO HAVE TROPICAL
PROPERTIES WITH STORMS PRODUCING EFFICIENT RAINFALL AND HEAVY RAIN.
EXPECT THIS TO BE THE PRIMARY HEAVY RAINFALL EVENT. DID ENTERTAIN
THE THOUGHT OF ISSUING A FLASH FLOOD WATCH FOR TONIGHT THROUGH
FRIDAY NIGHT OVER THE NORTH BUT WITH UNCERTAINTIES STILL
LOOMING...ESPECIALLY FOR THE TODAY/TONIGHT PERIOD...WILL HOLD OFF
FOR NOW AND CONTINUE TO MENTION POTENTIAL IN THE HWO. SEVERE WEATHER
POSSIBLE MAINLY SOUTH OF INTERSTATE 80 ON FRIDAY WHERE THE HIGHEST
INSTABILITIES ARE FORECAST. HAVE ADDED SMALL POPS TO SATURDAY WITH
THE SYSTEM SLOW TO DEPART.

FOLLOWED NEAR A MAV/MET BLEND ON TEMPERATURES TONIGHT THEN BELOW
GUIDANCE ON FRIDAY WITH EXPECTED PRECIPITATION AND CLOUD COVER. NO
CHANGES BEYOND SATURDAY.

&&

.AVIATION 21/06Z...
UNCERTAINTY CONTINUES AS TO HOW FAR SOUTH THE FRONT WILL SAG INTO
IOWA TODAY. WILL KEEP THUNDER MENTION LIMITED TO MCW/FOD/ALO THROUGH
FCST PERIOD...MAINLY THIS EVENING. EXCEPTION IS MCW WHERE CONVECTION
COULD BE ONGOING THIS MORNING.

&

.DMX WATCHES/WARNINGS/ADVISORIES...NONE.

&&

SHORT TERM...KINNEY
LONG TERM...DONAVON
AVIATION...KINNEY

Hazardous weather outlook, Jun 21, 10:35 AM CST, 2 hours 56 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE DES MOINES IA
1135 AM CDT THU JUN 21 2007

IAZ004>007-015>017-023>028-033>039-044>050-057>062-074-075-221100-
EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO-
POCAHONTAS-HUMBOLDT-WRIGHT-FRANKLIN-BUTLER-BREMER-SAC-CALHOUN-
WEBSTER-HAMILTON-HARDIN-GRUNDY-BLACK HAWK-CRAWFORD-CARROLL-GREENE-
BOONE-STORY-MARSHALL-TAMA-AUDUBON-GUTHRIE-DALLAS-POLK-JASPER-
POWESHIEK-MARION-MAHASKA-
1135 AM CDT THU JUN 21 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL AND
NORTH CENTRAL IOWA.

.DAY ONE...TODAY AND TONIGHT

THERE IS A MODERATE RISK FOR SEVERE WEATHER THIS AFTERNOON AND
TONIGHT. THUNDERSTORMS ARE EXPECTED THIS AFTERNOON...PRIMARILY
INCREASING IN COVERAGE THROUGH THE EVENING AND TONIGHT. GOLF BALL
SIZED HAIL...80 MPH WINDS AND ISOLATED TORNADOES ARE ALL POSSIBLE
BETWEEN 2 PM AND MIDNIGHT. QUARTER SIZED HAIL AND 60 MPH WINDS WILL
REMAIN A THREAT AFTER MIDNIGHT.

IN ADDITION...HEAVY RAINFALL OF 1 TO 3 INCHES IS POSSIBLE. LOCALLY
HIGHER AMOUNTS CAN NOT BE RULED OUT. THESE RAINFALL AMOUNTS WHICH
MAY FALL OVER A SHORT PERIOD OF TIME COULD PRODUCE LOCAL FLASH
FLOODING.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THE THREAT FOR VERY HEAVY RAINFALL WILL CONTINUE FRIDAY AND FRIDAY
NIGHT. TOTAL RAINFALL AMOUNTS FROM TONIGHT THROUGH SATURDAY
MORNING OF 2 TO 4 INCHES WITH ISOLATED AMOUNTS OVER 5 INCHES ARE
EXPECTED. FLASH FLOODING AND SIGNIFICANT RISES ON AREA RIVERS AND
STREAMS WOULD BE LIKELY IF THESE AMOUNTS VERIFY.

A SLIGHT RISK FOR SEVERE WEATHER IS FORECAST FOR FRIDAY AND FRIDAY
NIGHT WITH QUARTER SIZED HAIL AND 60 MPH WINDS POSSIBLE.

THUNDERSTORMS WILL LINGER INTO EARLY SATURDAY HOWEVER NO SEVERE
WEATHER IS ANTICIPATED.

.SPOTTER INFORMATION STATEMENT...

ATTENTION EMERGENCY MANAGERS...A CONFERENCE CALL WILL BE CONDUCTED
AT 1 PM THIS THURSDAY AFTERNOON.

SPOTTER ACTIVATION IS EXPECTED THIS AFTERNOON AND TONIGHT ESPECIALLY
BETWEEN 3 PM AND MIDNIGHT. ACTIVATION IS POSSIBLE AGAIN OF FRIDAY.
RAINFALL REPORTS WOULD BE GREATLY APPRECIATED DURING THE PERIOD AS
WELL.

IAZ070>073-081>086-092>097-221100-
CASS-ADAIR-MADISON-WARREN-ADAMS-UNION-CLARKE-LUCAS-MONROE-WAPELLO-
TAYLOR-RINGGOLD-DECATUR-WAYNE-APPANOOSE-DAVIS-
1135 AM CDT THU JUN 21 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL
IOWA.

.DAY ONE...TODAY AND TONIGHT

THERE IS A CHANCE FOR THUNDERSTORMS LATER THIS AFTERNOON AND
TONIGHT. A FEW STORMS MAY BE SEVERE WITH QUARTER SIZED HAIL AND 60
MPH WINDS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THERE IS A SLIGHT RISK FOR SEVERE WEATHER ON FRIDAY ESPECIALLY
DURING THE AFTERNOON AND EVENING HOURS. GOLF BALL SIZED HAIL AND
65 MPH WINDS ARE THE PRIMARY THREATS THOUGH AN ISOLATED TORNADO IS
POSSIBLE. HEAVY RAINFALL OF 1 TO 3 INCHES IS ALSO A THREAT.

THUNDERSTORMS WILL LINGER INTO SATURDAY THOUGH NO SEVERE WEATHER
IS EXPECTED.

.SPOTTER INFORMATION STATEMENT...

ATTENTION EMERGENCY MANAGERS...A CONFERENCE CALL WILL BE CONDUCTED
AT 1 PM THIS THURSDAY AFTERNOON.

SPOTTER ACTIVATION MAY BE REQUIRED LATER THIS AFTERNOON AND EVENING.
IT MAY ALSO BE REQUIRED FRIDAY AFTERNOON AND EVENING. RAINFALL
REPORTS WOULD BE GREATLY APPRECIATED DURING THE PERIOD AS WELL.

DONAVON/REV

The radar

The Des Moines radar (KDMX), 172 km away, was scanning. The volume nearest the first event began at 19:31 UTC.

Open the radar archive at this moment

Event by event

46 hail, 13 thunderstorm wind, 5 tornado, 2 funnel cloud. Local standard time, as filed.

Hail, Palo Alto

When: June 21, 1:31 PM CST
Where: Palo Alto County, 1.22 mi SE of Emmetsburg
Measured: 0.88 in hail
Property damage: $2,000
Crop damage: $5,000
Reported by: Broadcast Media
Coordinates: 43.110, -94.680

Hail, Crawford

When: June 21, 1:42 PM CST
Where: Crawford County, 5.56 mi S of Vail
Measured: 0.75 in hail
Crop damage: $5,000
Reported by: Trained Spotter
Coordinates: 41.990, -95.210

Hail, Kossuth

When: June 21, 1:42 PM CST
Where: Kossuth County, 4.09 mi E of Bancroft
Measured: 1.25 in hail
Property damage: $10,000
Crop damage: $5,000
Reported by: Trained Spotter
Coordinates: 43.270, -94.140

Hail, Hancock

When: June 21, 1:52 PM CST
Where: Hancock County, 0.86 mi NE of Corwith
Measured: 1.75 in hail
Property damage: $25,000
Crop damage: $5,000
Reported by: Post Office
Coordinates: 42.990, -93.960

Hail, Hancock

When: June 21, 2:00 PM CST
Where: Hancock County, 0.86 mi NE of Corwith
Measured: 1.75 in hail
Property damage: $25,000
Crop damage: $5,000
Reported by: Post Office
Coordinates: 42.990, -93.960

Hail, Hancock

When: June 21, 2:00 PM CST
Where: Hancock County, 5 mi S of Corwith
Measured: 2 in hail
Property damage: $15,000
Crop damage: $5,000
Reported by: Other Federal Agency
Coordinates: 42.908, -93.970

Hail, Hancock

When: June 21, 2:04 PM CST
Where: Hancock County, 4 mi S of Corwith
Measured: 1.75 in hail
Property damage: $15,000
Crop damage: $5,000
Reported by: Other Federal Agency
Coordinates: 42.922, -93.970

Hail, Crawford

When: June 21, 2:09 PM CST
Where: Crawford County, 5.56 mi S of Vail
Measured: 0.75 in hail
Crop damage: $5,000
Reported by: Trained Spotter
Coordinates: 41.990, -95.210

Hail, Hancock

When: June 21, 2:10 PM CST
Where: Hancock County, 4 mi SE of Corwith
Measured: 1.75 in hail
Property damage: $15,000
Crop damage: $5,000
Reported by: Other Federal Agency
Coordinates: 42.939, -93.914

Hail, Humboldt

When: June 21, 2:11 PM CST
Where: Humboldt County, Renwick
Measured: 1.75 in hail
Property damage: $25,000
Crop damage: $5,000
Reported by: Law Enforcement
Coordinates: 42.830, -93.980

Hail, Humboldt

When: June 21, 2:11 PM CST
Where: Humboldt County, 2.77 mi N of Renwick
Measured: 0.75 in hail
Crop damage: $5,000
Reported by: Trained Spotter
Coordinates: 42.870, -93.980

Hail, Humboldt

When: June 21, 2:15 PM CST
Where: Humboldt County, 3 mi N of Renwick
Measured: 2 in hail
Property damage: $25,000
Crop damage: $5,000
Reported by: Other Federal Agency
Coordinates: 42.873, -93.980

Hail, Wright

When: June 21, 2:15 PM CST
Where: Wright County, 6.58 mi NNW of Florence
Measured: 1.75 in hail
Property damage: $15,000
Crop damage: $5,000
Reported by: Other Federal Agency
Coordinates: 42.860, -93.940

Hail, Wright

When: June 21, 2:15 PM CST
Where: Wright County, 6.72 mi NNW of Florence
Measured: 1.75 in hail
Property damage: $15,000
Crop damage: $5,000
Reported by: Other Federal Agency
Coordinates: 42.870, -93.920

Hail, Humboldt

When: June 21, 2:20 PM CST
Where: Humboldt County, 2.77 mi N of Renwick
Measured: 2.5 in hail
Property damage: $40,000
Crop damage: $10,000
Reported by: Trained Spotter
Coordinates: 42.870, -93.980

Hail, Hancock

When: June 21, 2:20 PM CST
Where: Hancock County, 4 mi SE of Corwith
Measured: 1.75 in hail
Property damage: $15,000
Crop damage: $5,000
Reported by: Other Federal Agency
Coordinates: 42.939, -93.914

Hail, Butler

When: June 21, 2:30 PM CST
Where: Butler County, Aplington
Measured: 1 in hail
Property damage: $5,000
Crop damage: $5,000
Reported by: Law Enforcement
Coordinates: 42.580, -92.880

Hail, Wright

When: June 21, 2:30 PM CST
Where: Wright County, 6.72 mi NNW of Florence
Measured: 2 in hail
Property damage: $25,000
Crop damage: $5,000
Reported by: Other Federal Agency
Coordinates: 42.870, -93.921

Hail, Black Hawk

When: June 21, 2:35 PM CST
Where: Black Hawk County, 0.69 mi S of Washburn
Measured: 0.75 in hail
Crop damage: $5,000
Reported by: Trained Spotter
Coordinates: 42.410, -92.270

Hail, Black Hawk

When: June 21, 2:47 PM CST
Where: Black Hawk County, Cedar Falls
Measured: 0.88 in hail
Property damage: $2,000
Crop damage: $5,000
Reported by: Law Enforcement
Coordinates: 42.520, -92.450

Tornado, Butler

When: June 21, 2:51 PM CST
Where: Butler County, 3 mi S of Kesley
Rating: EF0
Path length: 0.1 mi
Path width: 25 yd
Crop damage: $1,000
Reported by: Trained Spotter
Coordinates: 42.627, -92.920

Brief touchdown in a field.

Funnel Cloud, Butler

When: June 21, 2:52 PM CST
Where: Butler County, 1.72 mi SW of Butler Center
Reported by: Law Enforcement
Coordinates: 42.680, -92.800

Tornado, Wright

When: June 21, 2:55 PM CST
Where: Wright County, 2.31 mi SSE of Holmes
Rating: EF0
Path length: 0.1 mi
Path width: 30 yd
Crop damage: $2,000
Reported by: Law Enforcement
Coordinates: 42.700, -93.800

Report of a brief tornado touchdown. No significant damage.

Thunderstorm Wind, Hardin

When: June 21, 2:55 PM CST
Where: Hardin County, 1.47 mi SSE of Pt Pleasant
Measured: 61 kt (70 mph) estimated gust
Property damage: $3,000
Reported by: Amateur Radio
Coordinates: 42.310, -93.220

Hail, Cass

When: June 21, 3:00 PM CST
Where: Cass County, 0.52 mi E of Atlantic
Measured: 0.88 in hail
Property damage: $2,000
Crop damage: $5,000
Reported by: Trained Spotter
Coordinates: 41.400, -95.010

Hail, Greene

When: June 21, 3:00 PM CST
Where: Greene County, Jefferson
Measured: 0.88 in hail
Property damage: $2,000
Crop damage: $5,000
Reported by: Law Enforcement
Coordinates: 42.020, -94.380

Hail, Greene

When: June 21, 3:00 PM CST
Where: Greene County, 6.31 mi S of Scranton
Measured: 0.88 in hail
Property damage: $2,000
Crop damage: $5,000
Reported by: Trained Spotter
Coordinates: 41.940, -94.570

Hail, Butler

When: June 21, 3:11 PM CST
Where: Butler County, Greene
Measured: 1 in hail
Property damage: $5,000
Crop damage: $5,000
Reported by: Law Enforcement
Coordinates: 42.900, -92.800

Hail, Guthrie

When: June 21, 3:15 PM CST
Where: Guthrie County, 2.81 mi N of Adair
Measured: 0.75 in hail
Crop damage: $5,000
Reported by: Trained Spotter
Coordinates: 41.540, -94.640

Hail, Cass

When: June 21, 3:18 PM CST
Where: Cass County, 4.18 mi N of Massena
Measured: 0.88 in hail
Property damage: $2,000
Crop damage: $5,000
Reported by: Trained Spotter
Coordinates: 41.310, -94.770

Thunderstorm Wind, Cass

When: June 21, 3:20 PM CST
Where: Cass County, 0.52 mi E of Atlantic
Measured: 57 kt (66 mph) estimated gust
Property damage: $15,000
Reported by: Law Enforcement
Coordinates: 41.400, -95.010

Thunderstorm Wind, Adair

When: June 21, 3:21 PM CST
Where: Adair County, Adair
Measured: 50 kt (58 mph) measured gust
Property damage: $1,000
Reported by: Mesonet
Coordinates: 41.500, -94.650

Tornado, Butler

When: June 21, 3:24 PM CST
Where: Butler County, 3.13 mi WSW of Shell Rock
Rating: EF0
Path length: 0.1 mi
Path width: 30 yd
Crop damage: $2,000
Reported by: Law Enforcement
Coordinates: 42.710, -92.640

Brief touchdown with no significant damage.

Hail, Hamilton

When: June 21, 3:31 PM CST
Where: Hamilton County, 0.86 mi NE of Stanhope
Measured: 0.75 in hail
Crop damage: $5,000
Reported by: Trained Spotter
Coordinates: 42.290, -93.790

Thunderstorm Wind, Adair

When: June 21, 3:32 PM CST
Where: Adair County, Fontanelle
Measured: 58 kt (67 mph) measured gust
Property damage: $10,000
Reported by: Mesonet
Coordinates: 41.300, -94.570

Hail, Adair

When: June 21, 3:36 PM CST
Where: Adair County, 7.58 mi NNE of Howe
Measured: 0.75 in hail
Crop damage: $5,000
Reported by: Emergency Manager
Coordinates: 41.500, -94.320

Hail, Hamilton

When: June 21, 3:41 PM CST
Where: Hamilton County, 0.86 mi NE of Stanhope
Measured: 0.75 in hail
Crop damage: $5,000
Reported by: Trained Spotter
Coordinates: 42.290, -93.790

Funnel Cloud, Black Hawk

When: June 21, 3:44 PM CST
Where: Black Hawk County, 0.69 mi S of Waterloo
Reported by: Law Enforcement
Coordinates: 42.490, -92.350

Hail, Adair

When: June 21, 3:45 PM CST
Where: Adair County, 2.82 mi N of Fisk
Measured: 0.88 in hail
Property damage: $2,000
Crop damage: $5,000
Reported by: Trained Spotter
Coordinates: 41.240, -94.540

Hail, Greene

When: June 21, 3:45 PM CST
Where: Greene County, 6.31 mi S of Scranton
Measured: 0.88 in hail
Property damage: $2,000
Crop damage: $5,000
Reported by: Trained Spotter
Coordinates: 41.940, -94.570

Hail, Dallas

When: June 21, 3:49 PM CST
Where: Dallas County, 1.38 mi N of Panther
Measured: 0.88 in hail
Property damage: $2,000
Crop damage: $5,000
Reported by: Trained Spotter
Coordinates: 41.700, -94.100

Thunderstorm Wind, Polk

When: June 21, 3:51 PM CST
Where: Polk County, Polk City
Measured: 52 kt (60 mph) estimated gust
Property damage: $5,000
Reported by: Law Enforcement
Coordinates: 41.770, -93.720

Hail, Dallas

When: June 21, 3:53 PM CST
Where: Dallas County, 1.48 mi SSE of Granger
Measured: 0.75 in hail
Crop damage: $5,000
Reported by: Amateur Radio
Coordinates: 41.750, -93.820

Thunderstorm Wind, Dallas

When: June 21, 3:55 PM CST
Where: Dallas County, 0.52 mi E of De Soto
Measured: 56 kt (64 mph) estimated gust
Property damage: $10,000
Reported by: Trained Spotter
Coordinates: 41.530, -94.010

Thunderstorm Wind, Polk

When: June 21, 3:57 PM CST
Where: Polk County, 0.86 mi SE of Ankeny
Measured: 52 kt (60 mph) estimated gust
Property damage: $5,000
Reported by: Amateur Radio
Coordinates: 41.720, -93.610

Tornado, Story

When: June 21, 3:58 PM CST
Where: Story County, 0.8 mi NNW of Kelley
Rating: EF0
Path length: 0.1 mi
Path width: 30 yd
Crop damage: $2,000
Reported by: Fire Department/Rescue
Coordinates: 41.961, -93.686

Brief touchdown with no significant damage.

Hail, Dallas

When: June 21, 4:01 PM CST
Where: Dallas County, 1.25 mi WNW of Booneville
Measured: 1 in hail
Property damage: $5,000
Crop damage: $5,000
Reported by: Trained Spotter
Coordinates: 41.530, -93.920

Hail, Dallas

When: June 21, 4:07 PM CST
Where: Dallas County, 1.25 mi WNW of Booneville
Measured: 1 in hail
Property damage: $5,000
Crop damage: $5,000
Reported by: Trained Spotter
Coordinates: 41.530, -93.920

Thunderstorm Wind, Polk

When: June 21, 4:14 PM CST
Where: Polk County, 1.38 mi N of Des Moines
Measured: 52 kt (60 mph) estimated gust
Property damage: $5,000
Reported by: NWS Employee
Coordinates: 41.620, -93.620

Tornado, Black Hawk

When: June 21, 4:22 PM CST
Where: Black Hawk County, 1.47 mi SSW of Castle Hill
Rating: EF0
Path length: 0.1 mi
Path width: 30 yd
Crop damage: $2,000
Reported by: County Official
Coordinates: 42.500, -92.410

Brief touchdown with no significant damage.

Thunderstorm Wind, Black Hawk

When: June 21, 4:28 PM CST
Where: Black Hawk County, 1.68 mi WSW of Waterloo Ranch Arpt
Measured: 61 kt (70 mph) estimated gust
Property damage: $10,000
Reported by: Trained Spotter
Coordinates: 42.490, -92.310

Thunderstorm Wind, Black Hawk

When: June 21, 4:30 PM CST
Where: Black Hawk County, 0.69 mi S of Waterloo
Measured: 52 kt (60 mph) estimated gust
Property damage: $10,000
Reported by: Storm Chaser
Coordinates: 42.490, -92.350

Hail, Jasper

When: June 21, 4:32 PM CST
Where: Jasper County, Newton
Measured: 0.75 in hail
Crop damage: $5,000
Reported by: Trained Spotter
Coordinates: 41.700, -93.050

Hail, Warren

When: June 21, 4:32 PM CST
Where: Warren County, 4.43 mi SSE of St Marys
Measured: 0.88 in hail
Property damage: $2,000
Crop damage: $5,000
Reported by: Trained Spotter
Coordinates: 41.260, -93.700

Hail, Madison

When: June 21, 4:35 PM CST
Where: Madison County, 1.48 mi NNE of St Charles
Measured: 1 in hail
Property damage: $2,000
Crop damage: $5,000
Reported by: Amateur Radio
Coordinates: 41.300, -93.810

Hail, Dallas

When: June 21, 4:37 PM CST
Where: Dallas County, 1.25 mi WNW of Booneville
Measured: 1 in hail
Property damage: $5,000
Crop damage: $5,000
Reported by: Trained Spotter
Coordinates: 41.530, -93.920

Thunderstorm Wind, Warren

When: June 21, 4:37 PM CST
Where: Warren County, New Virginia
Measured: 52 kt (60 mph) estimated gust
Property damage: $5,000
Reported by: Emergency Manager
Coordinates: 41.180, -93.730

Thunderstorm Wind, Jasper

When: June 21, 4:38 PM CST
Where: Jasper County, 0.69 mi N of Baxter
Measured: 52 kt (60 mph) estimated gust
Property damage: $5,000
Reported by: Amateur Radio
Coordinates: 41.830, -93.150

Hail, Warren

When: June 21, 4:40 PM CST
Where: Warren County, 3.46 mi S of St Marys
Measured: 0.88 in hail
Property damage: $2,000
Crop damage: $5,000
Reported by: Trained Spotter
Coordinates: 41.270, -93.730

Hail, Warren

When: June 21, 4:55 PM CST
Where: Warren County, 0.52 mi W of Medora
Measured: 1 in hail
Property damage: $5,000
Crop damage: $5,000
Reported by: Law Enforcement
Coordinates: 41.180, -93.630

Hail, Warren

When: June 21, 5:00 PM CST
Where: Warren County, 1.04 mi W of Cool
Measured: 1 in hail
Property damage: $5,000
Crop damage: $5,000
Reported by: Fire Department/Rescue
Coordinates: 41.180, -93.600

Hail, Mahaska

When: June 21, 5:07 PM CST
Where: Mahaska County, 0.86 mi NE of Leighton
Measured: 0.5 in hail
Crop damage: $5,000
Reported by: Public
Coordinates: 41.340, -92.790

Thunderstorm Wind, Poweshiek

When: June 21, 5:18 PM CST
Where: Poweshiek County, 0.86 mi SE of Brooklyn
Measured: 70 kt (81 mph) estimated gust
Property damage: $50,000
Reported by: Public
Coordinates: 41.720, -92.440

Hail, Decatur

When: June 21, 5:30 PM CST
Where: Decatur County, 2.09 mi SW of Le Roy
Measured: 0.75 in hail
Crop damage: $5,000
Reported by: Law Enforcement
Coordinates: 40.860, -93.610

Hail, Davis

When: June 21, 6:39 PM CST
Where: Davis County, 2.96 mi WNW of West Grove
Measured: 0.88 in hail
Property damage: $2,000
Crop damage: $5,000
Reported by: Trained Spotter
Coordinates: 40.740, -92.600

Hail, Davis

When: June 21, 6:52 PM CST
Where: Davis County, Bloomfield
Measured: 1 in hail
Property damage: $5,000
Crop damage: $5,000
Reported by: Trained Spotter
Coordinates: 40.750, -92.420

What these are

Hail: Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
Tornado: A violently rotating column of air in contact with the ground and extending from a thunderstorm, filed with its path, width and Fujita or Enhanced Fujita rating from the damage survey.
Funnel Cloud: A rotating column of cloud extending from a thunderstorm that did not reach the ground.
Thunderstorm Wind: Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Iowa in 2007 Every state in 2007 This day in weather history The tornado archive for Iowa, 2007 Warnings in Iowa, June 2007

Sources

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: 28137, 28138, 28139, 28140, 28141, 28193, 28194, 28142, 28195, 28143, 28144, 28196, 28197, 28198, 28145, 28199, 28146, 28200, 28147, 28148, 28190, 28135, 28175, 28179, 28149, 28150, 28151, 28152, 28153, 28154, 28180, 28192, 28176, 28155, 28191, 28156, 28157, 28136, 28158, 28159, and more.