Storm Events Database

Event Details

Event High Wind
Magnitude 57 kts.
State IOWA
County/Area SAC
WFO DMX
Report Source Trained Spotter
NCDC Data Source CSV
Begin Date 2011-06-26 20:40:00.0 CST-6
End Date 2011-06-26 23:40:00.0 CST-6
Deaths Direct/Indirect 0/0 (fatality details below, when available...)
Injuries Direct/Indirect 0/0
Property Damage 100.00K
Crop Damage 0.00K
Episode Narrative A dynamic pattern was once again in place over the central U.S. A strong surge of moisture took place during the day on the 26th, with precipitable water values rising to over 2 inches by evening. The airmass became very unstable with the lifted index falling to around -8 and CAPE in excess of 4000 J/kg. The atmosphere was quite warm with the freezing level between 15,000 and 16,000 feet. CAPE in the -10 to -30 C layer of the atmosphere was around 600 J/kg. Downdraft CAPE was quite high, in the 1200 to 1500 J/kg range. Considerable shear was available with shear in the 50 to 65 kt range. Meanwhile, a strong mid level trough of low pressure approached the central U.S. along with a moderate cold front approaching from the northwest. During the night, the low level jet increased to 70 kts, further feeding the thunderstorms. A large complex of thunderstorms developed across South Dakota into Nebraska. It moved southeast into the rich air over Iowa and accelerated, becoming a derecho. A large area of high winds developed with widespread wind gusts of 60 to 75 MPH, mainly over the southwest half of the CWA. The storms also produced hail at most locations as it passed. Most of the hail was around an inch or so in diameter. A smaller area of thunderstorms formed over southeast Iowa, ahead of the main area. These storms produced hail up to golf ball in size, along with 60 MPH winds during the early evening. The largest hail reported was 2 inches in diameter in Cincinnati in Appanoose County. The storms produced copious rainfall in spite of their rapid movement. Flash flooding was reported in Union, Adair, Davis, and Adams Counties. For the most part the flash flooding was relatively minor, limited to water flowing rapidly over roads. In Davis County at Bloomfield, water blew off manhole covers and was deep enough to nearly reach the tops of car roofs. The thunderstorm winds caused widespread damage to trees and power lines. A semi-truck was overturned on Highway 141 west of Woodward by the winds. Another was overturned in Carroll County on U.S. highway 30. A high wind event also took place with the storm complex as a wake low formed. Strong easterly winds developed with wind speeds in the 60 to 75 MPH range common. The strongest winds occurred in Webster County at Callendar. Winds of 80 to 90 MPH blew down mailbox posts, blew down trees onto houses, and picked up a swing set and blew it through the window of a house. Tree and power line damage was quite widespread over a 7 county area. One tornado touched down in Carroll County south of Halbur. A narrow swath of damage occurred from about one quarter mile south of the intersection of Granite Ave and County Road E53, with the roof blown off a hog confinement building just southeast of the intersection. Minor damage continued along a path 2.5 miles long to the east with another roof partially blown off of a Morton building just southwest of the intersection of County Road E53 and Ivy Ave. The tornado lifted about one quarter of a mile southeast of the intersection.
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 3.613M 135.00K
UNION CO. UNION CO. IA 06/26/2011 15:55 CST-6 Hail 1.00 in. 0 0 1.00K 10.00K
UNION CO. UNION CO. IA 06/26/2011 16:25 CST-6 Flash Flood 0 0 10.00K 0.00K
LUCAS CO. LUCAS CO. IA 06/26/2011 16:25 CST-6 Hail 1.00 in. 0 0 1.00K 10.00K
CLARKE CO. CLARKE CO. IA 06/26/2011 16:55 CST-6 Hail 1.00 in. 0 0 1.00K 10.00K
CASS CO. CASS CO. IA 06/26/2011 17:00 CST-6 Hail 1.00 in. 0 0 0.00K 10.00K
LUCAS CO. LUCAS CO. IA 06/26/2011 17:04 CST-6 Thunderstorm Wind 57 kts. EG 0 0 10.00K 0.00K
LUCAS CO. LUCAS CO. IA 06/26/2011 17:04 CST-6 Hail 0.88 in. 0 0 0.00K 5.00K
ADAIR CO. ADAIR CO. IA 06/26/2011 17:12 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
APPANOOSE CO. APPANOOSE CO. IA 06/26/2011 17:21 CST-6 Hail 1.75 in. 0 0 50.00K 5.00K
APPANOOSE CO. APPANOOSE CO. IA 06/26/2011 17:22 CST-6 Hail 1.00 in. 0 0 5.00K 5.00K
APPANOOSE CO. APPANOOSE CO. IA 06/26/2011 17:23 CST-6 Hail 1.00 in. 0 0 3.00K 0.00K
APPANOOSE CO. APPANOOSE CO. IA 06/26/2011 17:49 CST-6 Thunderstorm Wind 52 kts. EG 0 0 10.00K 0.00K
ADAMS CO. ADAMS CO. IA 06/26/2011 18:04 CST-6 Flash Flood 0 0 10.00K 0.00K
APPANOOSE CO. APPANOOSE CO. IA 06/26/2011 18:07 CST-6 Hail 1.00 in. 0 0 1.00K 10.00K
ADAMS CO. ADAMS CO. IA 06/26/2011 18:20 CST-6 Flash Flood 0 0 15.00K 0.00K
DAVIS CO. DAVIS CO. IA 06/26/2011 18:29 CST-6 Thunderstorm Wind 61 kts. EG 0 0 25.00K 0.00K
DAVIS CO. DAVIS CO. IA 06/26/2011 18:30 CST-6 Flash Flood 0 0 250.00K 0.00K
DAVIS CO. DAVIS CO. IA 06/26/2011 18:40 CST-6 Thunderstorm Wind 61 kts. EG 0 0 25.00K 0.00K
CRAWFORD CO. CRAWFORD CO. IA 06/26/2011 19:11 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
CRAWFORD CO. CRAWFORD CO. IA 06/26/2011 19:28 CST-6 Thunderstorm Wind 61 kts. EG 0 0 40.00K 0.00K
CRAWFORD CO. CRAWFORD CO. IA 06/26/2011 19:30 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
CRAWFORD CO. CRAWFORD CO. IA 06/26/2011 19:33 CST-6 Thunderstorm Wind 57 kts. EG 0 0 10.00K 0.00K
SAC CO. SAC CO. IA 06/26/2011 19:34 CST-6 Thunderstorm Wind 52 kts. EG 0 0 2.00K 0.00K
CARROLL CO. CARROLL CO. IA 06/26/2011 19:40 CST-6 Tornado EF1 0 0 100.00K 10.00K
CARROLL CO. CARROLL CO. IA 06/26/2011 19:43 CST-6 Thunderstorm Wind 52 kts. MG 0 0 5.00K 0.00K
CARROLL CO. CARROLL CO. IA 06/26/2011 19:45 CST-6 Thunderstorm Wind 57 kts. EG 0 0 10.00K 0.00K
AUDUBON CO. AUDUBON CO. IA 06/26/2011 19:47 CST-6 Thunderstorm Wind 65 kts. EG 0 0 100.00K 0.00K
AUDUBON CO. AUDUBON CO. IA 06/26/2011 19:51 CST-6 Hail 1.00 in. 0 0 0.00K 10.00K
CARROLL CO. CARROLL CO. IA 06/26/2011 19:55 CST-6 Thunderstorm Wind 57 kts. EG 0 0 20.00K 0.00K
GREENE CO. GREENE CO. IA 06/26/2011 20:00 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
ADAIR CO. ADAIR CO. IA 06/26/2011 20:11 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
ADAIR CO. ADAIR CO. IA 06/26/2011 20:24 CST-6 Thunderstorm Wind 57 kts. EG 0 0 5.00K 0.00K
DALLAS CO. DALLAS CO. IA 06/26/2011 20:26 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
DALLAS CO. DALLAS CO. IA 06/26/2011 20:27 CST-6 Thunderstorm Wind 53 kts. MG 0 0 5.00K 0.00K
GUTHRIE CO. GUTHRIE CO. IA 06/26/2011 20:28 CST-6 Hail 0.75 in. 0 0 0.00K 5.00K
BOONE CO. BOONE CO. IA 06/26/2011 20:29 CST-6 Thunderstorm Wind 57 kts. EG 0 0 10.00K 0.00K
DALLAS CO. DALLAS CO. IA 06/26/2011 20:30 CST-6 Thunderstorm Wind 52 kts. EG 0 0 10.00K 0.00K
BOONE CO. BOONE CO. IA 06/26/2011 20:30 CST-6 Thunderstorm Wind 52 kts. EG 0 0 10.00K 0.00K
DALLAS CO. DALLAS CO. IA 06/26/2011 20:30 CST-6 Thunderstorm Wind 57 kts. EG 0 0 5.00K 0.00K
MADISON CO. MADISON CO. IA 06/26/2011 20:35 CST-6 Hail 1.00 in. 0 0 0.00K 10.00K
BOONE CO. BOONE CO. IA 06/26/2011 20:35 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
EMMET (ZONE) EMMET (ZONE) IA 06/26/2011 20:40 CST-6 High Wind 61 kts. EG 0 0 150.00K 0.00K
CRAWFORD (ZONE) CRAWFORD (ZONE) IA 06/26/2011 20:40 CST-6 High Wind 51 kts. MG 0 0 75.00K 0.00K
SAC (ZONE) SAC (ZONE) IA 06/26/2011 20:40 CST-6 High Wind 57 kts. EG 0 0 100.00K 0.00K
HUMBOLDT (ZONE) HUMBOLDT (ZONE) IA 06/26/2011 20:40 CST-6 High Wind 61 kts. EG 0 0 150.00K 0.00K
PALO ALTO (ZONE) PALO ALTO (ZONE) IA 06/26/2011 20:40 CST-6 High Wind 61 kts. EG 0 0 150.00K 0.00K
POCAHONTAS (ZONE) POCAHONTAS (ZONE) IA 06/26/2011 20:40 CST-6 High Wind 61 kts. EG 0 0 150.00K 0.00K
CARROLL (ZONE) CARROLL (ZONE) IA 06/26/2011 20:40 CST-6 High Wind 61 kts. MG 0 0 150.00K 0.00K
KOSSUTH (ZONE) KOSSUTH (ZONE) IA 06/26/2011 20:40 CST-6 High Wind 61 kts. EG 0 0 150.00K 0.00K
ADAIR CO. ADAIR CO. IA 06/26/2011 20:40 CST-6 Thunderstorm Wind 57 kts. EG 0 0 15.00K 0.00K
POLK CO. POLK CO. IA 06/26/2011 20:47 CST-6 Thunderstorm Wind 55 kts. MG 0 0 5.00K 0.00K
WARREN CO. WARREN CO. IA 06/26/2011 20:50 CST-6 Thunderstorm Wind 57 kts. EG 0 0 10.00K 0.00K
POLK CO. POLK CO. IA 06/26/2011 20:52 CST-6 Thunderstorm Wind 53 kts. MG 0 0 10.00K 0.00K
STORY CO. STORY CO. IA 06/26/2011 20:52 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
UNION CO. UNION CO. IA 06/26/2011 21:05 CST-6 Hail 1.00 in. 0 0 1.00K 10.00K
WARREN CO. WARREN CO. IA 06/26/2011 21:05 CST-6 Thunderstorm Wind 61 kts. EG 0 0 25.00K 0.00K
POLK CO. POLK CO. IA 06/26/2011 21:06 CST-6 Thunderstorm Wind 50 kts. MG 0 0 2.00K 0.00K
APPANOOSE CO. APPANOOSE CO. IA 06/26/2011 21:11 CST-6 Flash Flood 0 0 100.00K 0.00K
WARREN CO. WARREN CO. IA 06/26/2011 21:14 CST-6 Heavy Rain 0 0 0.00K 0.00K
MARSHALL CO. MARSHALL CO. IA 06/26/2011 21:15 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
APPANOOSE CO. APPANOOSE CO. IA 06/26/2011 21:30 CST-6 Flash Flood 0 0 500.00K 20.00K
MARION CO. MARION CO. IA 06/26/2011 21:31 CST-6 Thunderstorm Wind 54 kts. MG 0 0 5.00K 0.00K
MARION CO. MARION CO. IA 06/26/2011 21:34 CST-6 Thunderstorm Wind 61 kts. EG 0 0 10.00K 0.00K
MARION CO. MARION CO. IA 06/26/2011 21:35 CST-6 Thunderstorm Wind 57 kts. EG 0 0 15.00K 0.00K
MARION CO. MARION CO. IA 06/26/2011 21:38 CST-6 Thunderstorm Wind 63 kts. MG 0 0 25.00K 0.00K
CLARKE CO. CLARKE CO. IA 06/26/2011 21:40 CST-6 Hail 1.25 in. 0 0 1.00K 0.00K
MARION CO. MARION CO. IA 06/26/2011 21:40 CST-6 Thunderstorm Wind 67 kts. MG 0 0 30.00K 0.00K
MARION CO. MARION CO. IA 06/26/2011 21:44 CST-6 Thunderstorm Wind 57 kts. MG 0 0 20.00K 0.00K
MONROE CO. MONROE CO. IA 06/26/2011 21:52 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
APPANOOSE CO. APPANOOSE CO. IA 06/26/2011 22:00 CST-6 Hail 2.00 in. 0 0 50.00K 5.00K
MAHASKA CO. MAHASKA CO. IA 06/26/2011 22:06 CST-6 Thunderstorm Wind 55 kts. EG 0 0 10.00K 0.00K
HAMILTON (ZONE) HAMILTON (ZONE) IA 06/26/2011 22:15 CST-6 High Wind 59 kts. EG 0 0 100.00K 0.00K
WEBSTER (ZONE) WEBSTER (ZONE) IA 06/26/2011 22:15 CST-6 High Wind 74 kts. EG 0 0 500.00K 0.00K
CALHOUN (ZONE) CALHOUN (ZONE) IA 06/26/2011 22:15 CST-6 High Wind 61 kts. MG 0 0 100.00K 0.00K
WRIGHT (ZONE) WRIGHT (ZONE) IA 06/26/2011 22:15 CST-6 High Wind 59 kts. EG 0 0 100.00K 0.00K
GREENE (ZONE) GREENE (ZONE) IA 06/26/2011 22:15 CST-6 High Wind 61 kts. EG 0 0 100.00K 0.00K
WAPELLO CO. WAPELLO CO. IA 06/26/2011 22:25 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
Totals: 0 0 3.613M 135.00K