Storm Events Database

Event Details

Event Hail
Magnitude 1.00 in.
State IOWA
County/Area GRUNDY
WFO DMX
Report Source Public
NCDC Data Source CSV
Begin Date 2010-06-18 16:01:00.0 CST-6
Begin Location 1SE CONRAD
Begin Lat/Lon 42.22/-92.87
End Date 2010-06-18 16:01:00.0 CST-6
Deaths Direct/Indirect 0/0 (fatality details below, when available...)
Injuries Direct/Indirect 0/0
Property Damage 2.00K
Crop Damage 5.00K
Episode Narrative The frontal boundary that moved through the state during the previous night retreated northwest and allowed the atmosphere to reload. CAPE rose to 2000 to 3000 J/kg by mid morning with downdraft CAPE values in the 1400 to 1600 J/kg range and available CAPE in the -10 to -30 layer of the atmosphere around 500 J/kg. The freezing level fell slightly from the previous night and was around 13,500 to 14,000 feet. Lifted indices were only in the -1 to -3 C range. The shear was about the same as the previous night, in the 20 to 35 kt range, however precipitable water values fell to 1.1 to 1.5 inches. As the warm air returned, thunderstorms developed before dawn. They increased in strength as a weak shortwave approached the area. The thunderstorms formed into a cluster over northeast Nebraska into western Iowa after sunrise. The small MCS took on a mini bow type configuration. Though there were a few reports of hail of up to an inch in diameter, the primary mode of severe weather was high winds from the bowing system. Wind speeds of 60 to 80 MPH were common along the leading edge of the storm. Tree damage was widespread over a several county wide area. Some property damage was done by the winds as well due to flying debris. The thunderstorms continued southeast into southeast Iowa during the late morning and early afternoon and weakened slowly. Another line of thunderstorms formed over northwest Iowa by late morning and continued into the mid afternoon hours. These storms produced high winds, heavy rainfall, and hail. The hail was generally around an inch in diameter, with the largest being golf ball size in Webster County. Golf ball size hail also fell in Warren County at Milo. Wind speeds were in the 60 to 65 MPH range for the most part, resulting in tree and power line damage. A tornado touched down in open fields in Madison county north of St Charles. The heavy rainfall resulted in some flash flooding as well. Soil conditions across the state were nearly saturated, so a quick 1 to 2 inches of rainfall caused local flash flooding in Black Hawk, Marion, and Tama Counties.
Event Narrative


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All events for this episode:

Location County/Zone St. Date Time T.Z. Type Mag Dth Inj PrD CrD
Totals: 0 0 736.00K 405.00K
GRAY AUDUBON CO. IA 06/18/2010 07:35 CST-6 Thunderstorm Wind 52 kts. EG 0 0 10.00K 0.00K
GRAY AUDUBON CO. IA 06/18/2010 07:40 CST-6 Thunderstorm Wind 52 kts. EG 0 0 10.00K 0.00K
SCRANTON GREENE CO. IA 06/18/2010 07:47 CST-6 Thunderstorm Wind 65 kts. EG 0 0 25.00K 0.00K
GRAND JCT GREENE CO. IA 06/18/2010 08:08 CST-6 Thunderstorm Wind 57 kts. EG 0 0 5.00K 0.00K
LEWIS CASS CO. IA 06/18/2010 08:10 CST-6 Hail 1.00 in. 0 0 10.00K 0.00K
CUMBERLAND CASS CO. IA 06/18/2010 08:15 CST-6 Thunderstorm Wind 61 kts. EG 0 0 10.00K 0.00K
CUMBERLAND CASS CO. IA 06/18/2010 08:20 CST-6 Thunderstorm Wind 52 kts. EG 0 0 25.00K 0.00K
FONTANELLE ADAIR CO. IA 06/18/2010 08:20 CST-6 Thunderstorm Wind 57 kts. EG 0 0 25.00K 0.00K
ROCKWELL CERRO GORDO CO. IA 06/18/2010 08:20 CST-6 Hail 0.88 in. 0 0 1.00K 5.00K
GREENFIELD ARPT ADAIR CO. IA 06/18/2010 08:25 CST-6 Thunderstorm Wind 65 kts. EG 0 0 150.00K 25.00K
JORDAN BOONE CO. IA 06/18/2010 08:45 CST-6 Thunderstorm Wind 56 kts. MG 0 0 10.00K 0.00K
DEXTER DALLAS CO. IA 06/18/2010 08:46 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
WINTERSET MADISON CO. IA 06/18/2010 08:46 CST-6 Thunderstorm Wind 65 kts. EG 0 0 20.00K 0.00K
AMES STORY CO. IA 06/18/2010 08:50 CST-6 Thunderstorm Wind 52 kts. EG 0 0 15.00K 0.00K
AMES STORY CO. IA 06/18/2010 08:50 CST-6 Thunderstorm Wind 50 kts. EG 0 0 0.00K 0.00K
ADEL DALLAS CO. IA 06/18/2010 08:54 CST-6 Thunderstorm Wind 54 kts. EG 0 0 25.00K 0.00K
HADDEN HILL DALLAS CO. IA 06/18/2010 08:54 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
WINTERSET MADISON CO. IA 06/18/2010 08:54 CST-6 Thunderstorm Wind 61 kts. EG 0 0 5.00K 0.00K
HADDEN HILL DALLAS CO. IA 06/18/2010 08:56 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
DES MOINES POLK CO. IA 06/18/2010 08:59 CST-6 Thunderstorm Wind 61 kts. EG 0 0 25.00K 0.00K
AMES STORY CO. IA 06/18/2010 09:00 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
ANKENY POLK CO. IA 06/18/2010 09:05 CST-6 Thunderstorm Wind 56 kts. MG 0 0 10.00K 0.00K
CAPITOL HGTS POLK CO. IA 06/18/2010 09:08 CST-6 Thunderstorm Wind 52 kts. EG 0 0 10.00K 0.00K
DES MOINES POLK CO. IA 06/18/2010 09:15 CST-6 Thunderstorm Wind 52 kts. EG 0 0 10.00K 0.00K
FT DES MOINES POLK CO. IA 06/18/2010 09:15 CST-6 Thunderstorm Wind 65 kts. EG 0 0 15.00K 0.00K
NEVADA STORY CO. IA 06/18/2010 09:20 CST-6 Thunderstorm Wind 52 kts. EG 0 0 10.00K 0.00K
INDIANOLA ARPT WARREN CO. IA 06/18/2010 09:24 CST-6 Thunderstorm Wind 56 kts. EG 0 0 10.00K 0.00K
SAYLORVILLE POLK CO. IA 06/18/2010 09:25 CST-6 Thunderstorm Wind 54 kts. MG 0 0 5.00K 0.00K
PLEASANTVILLE MARION CO. IA 06/18/2010 09:37 CST-6 Thunderstorm Wind 52 kts. EG 0 0 15.00K 0.00K
SCHALLER SAC CO. IA 06/18/2010 10:50 CST-6 Hail 1.00 in. 0 0 3.00K 5.00K
OTTUMWA WAPELLO CO. IA 06/18/2010 11:15 CST-6 Thunderstorm Wind 52 kts. EG 0 0 3.00K 0.00K
CLARE WEBSTER CO. IA 06/18/2010 11:53 CST-6 Hail 1.00 in. 0 0 3.00K 5.00K
FT DODGE WEBSTER CO. IA 06/18/2010 11:57 CST-6 Hail 1.00 in. 0 0 3.00K 5.00K
BADGER WEBSTER CO. IA 06/18/2010 12:01 CST-6 Hail 1.00 in. 0 0 2.00K 5.00K
BADGER WEBSTER CO. IA 06/18/2010 12:05 CST-6 Hail 1.75 in. 0 0 25.00K 50.00K
BADGER WEBSTER CO. IA 06/18/2010 12:06 CST-6 Hail 1.50 in. 0 0 5.00K 10.00K
BADGER WEBSTER CO. IA 06/18/2010 12:09 CST-6 Hail 0.88 in. 0 0 0.00K 5.00K
BADGER WEBSTER CO. IA 06/18/2010 12:12 CST-6 Hail 1.00 in. 0 0 3.00K 5.00K
DAKOTA CITY HUMBOLDT CO. IA 06/18/2010 12:49 CST-6 Hail 0.75 in. 0 0 0.00K 5.00K
BROCK RANCH ARPT HUMBOLDT CO. IA 06/18/2010 12:54 CST-6 Hail 1.00 in. 0 0 3.00K 5.00K
CORNELIA WRIGHT CO. IA 06/18/2010 13:29 CST-6 Thunderstorm Wind 61 kts. EG 0 0 0.00K 50.00K
BELMOND WRIGHT CO. IA 06/18/2010 13:37 CST-6 Thunderstorm Wind 52 kts. EG 0 0 3.00K 0.00K
BELMOND WRIGHT CO. IA 06/18/2010 13:40 CST-6 Thunderstorm Wind 52 kts. EG 0 0 2.00K 0.00K
CHAPIN FRANKLIN CO. IA 06/18/2010 13:55 CST-6 Hail 1.25 in. 0 0 5.00K 10.00K
ALEXANDER FRANKLIN CO. IA 06/18/2010 14:05 CST-6 Thunderstorm Wind 50 kts. EG 0 0 5.00K 100.00K
BRISTOW BUTLER CO. IA 06/18/2010 15:25 CST-6 Hail 0.88 in. 0 0 0.00K 5.00K
UNION HARDIN CO. IA 06/18/2010 15:28 CST-6 Hail 1.25 in. 0 0 3.00K 10.00K
PATTERSON MADISON CO. IA 06/18/2010 15:35 CST-6 Hail 0.88 in. 0 0 0.00K 5.00K
BEVINGTON MADISON CO. IA 06/18/2010 15:42 CST-6 Hail 0.75 in. 0 0 0.00K 5.00K
UNION HARDIN CO. IA 06/18/2010 15:50 CST-6 Hail 1.00 in. 0 0 1.00K 5.00K
BEVINGTON MADISON CO. IA 06/18/2010 15:55 CST-6 Funnel Cloud 0 0 0.00K 0.00K
ST CHARLES MADISON CO. IA 06/18/2010 15:55 CST-6 Tornado EF0 0 0 0.00K 0.00K
WATERLOO BLACK HAWK CO. IA 06/18/2010 15:56 CST-6 Hail 0.88 in. 0 0 0.00K 3.00K
WATERLOO BLACK HAWK CO. IA 06/18/2010 15:58 CST-6 Hail 1.00 in. 0 0 0.00K 5.00K
CONRAD GRUNDY CO. IA 06/18/2010 16:01 CST-6 Hail 1.00 in. 0 0 2.00K 5.00K
ST MARYS WARREN CO. IA 06/18/2010 16:18 CST-6 Hail 1.00 in. 0 0 1.00K 5.00K
WATERLOO BLACK HAWK CO. IA 06/18/2010 16:19 CST-6 Heavy Rain 0 0 5.00K 0.00K
ST MARYS WARREN CO. IA 06/18/2010 16:27 CST-6 Hail 0.88 in. 0 0 0.00K 5.00K
CEDAR FALLS BLACK HAWK CO. IA 06/18/2010 16:38 CST-6 Flash Flood 0 0 10.00K 0.00K
ORANGE BLACK HAWK CO. IA 06/18/2010 16:38 CST-6 Flash Flood 0 0 25.00K 0.00K
LIBERTY CENTER WARREN CO. IA 06/18/2010 16:44 CST-6 Hail 1.00 in. 0 0 1.00K 5.00K
INDIANOLA ARPT WARREN CO. IA 06/18/2010 16:46 CST-6 Hail 0.88 in. 0 0 0.00K 5.00K
MILO WARREN CO. IA 06/18/2010 16:48 CST-6 Hail 1.75 in. 0 0 10.00K 15.00K
LACONA WARREN CO. IA 06/18/2010 16:52 CST-6 Hail 1.00 in. 0 0 2.00K 5.00K
KNOXVILLE ARPT MARION CO. IA 06/18/2010 16:56 CST-6 Thunderstorm Wind 65 kts. EG 0 0 25.00K 0.00K
HARVEY MARION CO. IA 06/18/2010 17:08 CST-6 Thunderstorm Wind 52 kts. EG 0 0 2.00K 0.00K
GARWIN TAMA CO. IA 06/18/2010 17:09 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
ATTICA MARION CO. IA 06/18/2010 17:11 CST-6 Thunderstorm Wind 61 kts. EG 0 0 5.00K 0.00K
ARISPE UNION CO. IA 06/18/2010 17:20 CST-6 Hail 0.88 in. 0 0 0.00K 5.00K
TOLEDO TAMA CO. IA 06/18/2010 17:20 CST-6 Hail 0.88 in. 0 0 0.00K 5.00K
TAMA TAMA CO. IA 06/18/2010 17:24 CST-6 Hail 1.00 in. 0 0 1.00K 5.00K
AFTON UNION CO. IA 06/18/2010 17:25 CST-6 Hail 1.00 in. 0 0 1.00K 5.00K
MARYSVILLE MARION CO. IA 06/18/2010 17:30 CST-6 Thunderstorm Wind 61 kts. EG 0 0 5.00K 0.00K
ARISPE UNION CO. IA 06/18/2010 17:35 CST-6 Hail 0.88 in. 0 0 0.00K 2.00K
LOVILIA MONROE CO. IA 06/18/2010 17:46 CST-6 Hail 1.00 in. 0 0 2.00K 5.00K
MARYSVILLE MARION CO. IA 06/18/2010 17:51 CST-6 Flash Flood 0 0 10.00K 0.00K
VAN WERT DECATUR CO. IA 06/18/2010 18:25 CST-6 Thunderstorm Wind 61 kts. EG 0 0 5.00K 0.00K
CLUTIER TAMA CO. IA 06/18/2010 18:31 CST-6 Flash Flood 0 0 10.00K 0.00K
GRIFFINSVILLE APPANOOSE CO. IA 06/18/2010 19:03 CST-6 Thunderstorm Wind 52 kts. EG 0 0 3.00K 0.00K
MARK DAVIS CO. IA 06/18/2010 19:28 CST-6 Thunderstorm Wind 52 kts. EG 0 0 3.00K 0.00K
PROMISE CITY WAYNE CO. IA 06/18/2010 19:45 CST-6 Thunderstorm Wind 65 kts. EG 0 0 50.00K 0.00K
SEYMOUR WAYNE CO. IA 06/18/2010 20:08 CST-6 Hail 1.00 in. 0 0 2.00K 5.00K
SEYMOUR WAYNE CO. IA 06/18/2010 20:09 CST-6 Thunderstorm Wind 52 kts. EG 0 0 3.00K 0.00K
JEROME APPANOOSE CO. IA 06/18/2010 20:24 CST-6 Thunderstorm Wind 52 kts. EG 0 0 3.00K 0.00K
Totals: 0 0 736.00K 405.00K