Storm Events Database

Event Details

Event Tornado
-- Scale EF0
-- Length 1.07 Miles
-- Width 50 Yards
State IOWA
County/Area GRUNDY
WFO DMX
Begin Date 05/25/2008 16:07:00 CST-6
Begin Range 2
Begin Azimuth NE
Begin Location STOUT
Begin Lat/Lon 42.55/-92.68
End Date 05/25/2008 16:09:00 CST-6
End Range 3
End Azimuth ENE
End Location STOUT
End Lat/Lon 42.55/-92.66
Deaths Direct/Indirect 0/0 (fatality details below, when available...)
Injuries Direct/Indirect 0/0
Property Damage 1.00K
Crop Damage 1.00K
Episode Narrative A very intense upper low was located over the southwest U.S. and lifted northeast during the weekend of the 24th into the morning of the 26th. The seasons first strong push of deep moisture moved into Iowa on the 25th with surface temperatures warming into the mid 80s and dew points surging into the upper 60s to low 70s. Precipitable water values were near 1.5 inches. The dry slot pushed north across the area the previous night as the warm front lifted north. The primary surface low was located over northern Minnesota. A cold front extended south from the low into northwest Iowa. The airmass became very unstable by the mid afternoon hours. MUCAPE rose to between 4000 and 5000 J/kg. Lifted indices fell to -8 to -11 C. There was a considerable amount of both DCAPE at 1000-1500 J/kg and cape in the -10 to-30 C. layer of the atmoshpere, between 400 and 600 J/kg. The freezing level was around 13,200 feet. The environment was quite sheared with effective shear in the 40 to 50 kt range. LCL values were between 1000 and 1500 meters. The airmass was initially capped. During the late afternoon hours, a small cluster of thunderstorms formed over north central into northeast Iowa. The storms became severe very quickly. Initially, the storms dropped hail up to golf ball in size. One became a strong super cell and produced a major tornado. This cell, in addition to being tornadic, also produced hail of baseball to softball in size and winds in excess of 90 MPH. The tornado track was from approximately 2 miles south of Aplington to Parkersburg, then continued to New Hartford and across northern Black Hawk County. The average path width ranged from 0.6 to 0.7 miles near Parkersburg to just north of New Hartford. The path constricted to near one quarter mile wide east of New Hartford to north of Waterloo. The width then increased to near 1.2 miles wide north of Dunkerton before dissipating near the Black Hawk and Buchanan County line. The tornado was on the ground for approximately 43 miles. In addition to the main tornado, a satellite tornado was observed by storm chasers and one off duty NWS employee. It was located south of the main tornado and was on the ground for a little over a mile in Grundy County. Initial reports indicated 9 fatalities with 7 in Parkersburg (pop 1889) and 2 in New Hartford (pop 637). There were at least 50 injuries, with 4 of those in critical condition. Two of the fatalities occurred a few days after the tornado from injuries sustained in the tornado. The last fatality occurred on 7 Nov. A 61 year old female sustained injuries in the stairwell of her home when a 2 x 4 was thrown through her right side lung. She was hospitalized and died several months later of complications. Significant structural damage occurred across the southern end of Parkersburg and along a path to just north of New Hartford. Numerous structures completely destroyed from Parkersburg to near New Hartford. The tornado continued eastward to just north of the Waterloo and Cedar Falls area. Significant damage also occurred north of Dunkerton where the tornado increased to its greatest path width. This storm also produced substantial straight line wind damage along the southern periphery of the storm just south of the tornado track. News accounts indicated that a receipt from Parkersburg was found around 1915 CST 3 miles north of Prairie du Chien, WI, 109 miles to the northeast. Receipits were also found in Clayton County at Elkader, and full scrapbook pages and photos were found in far northeast Bremer County at Sumner. Preliminary estimates that straight line winds of 90 to 100 MPH occurred with this storm. At 1637 CST, the Waterloo Airport recorded a 93 MPH wind gust. Survey results suggest that straight line wind damage was the cause of the severe damage at the recreational vehicle dealership north of Cedar Falls. At least 627 homes were damaged, including 288 homes destroyed in Parkersburg, 88 in New Hartford, 15 in Hazelton and another 50 in Black Hawk County. In addition, 58 had major damage, 33 had moderate damage, 2 were inaccessible, and 93 damaged but able to be occupied. There were also 21 businesses destroyed. Governor Chet Culver declared both Butler and Black Hawk disaster areas with both given the State Declaration. A Federal Disaster Declaration occurred two days later for both Butler and Black Hawk Counties. The tornado was rated a low end EF5 by a Quick Response Team (QRT) in portions of Parkersburg and north of New Hartford with peak winds estimated at 205 MPH. For historical reference, the last F5 tornado to hit Iowa was on 13 June 1976 in Boone and Story Counties in the town of Jordan, with a 21 mile path length. The last F4 tornado to hit Iowa was in Union, Madison, and Dallas Counties with a 56 mile path length on 8 April 1999. There was one other smaller tornado during the evening. A tornado touched down in Clarke County and was on the ground for a short time southeast of Osceola. After the initial thunderstorm area developed over north central and northeast Iowa, a large complex developed over southeast Nebraska. The two areas of storms filled in to form a squall line by the mid evening hours. The complex over Nebraska then pushed east and northeast along the squall line. A considerable amount of severe weather was generated during the evening as this occurred. Along the squall line, high winds and hail were common with the dominant mode of severe weather being hail of up to golf ball in size. As the MCS out of Nebraska advanced east, a tail extending south from the centroid took on a bow echo configuration and raced east across Iowa at 65 MPH. Very high winds occurred with this feature with numerous locations reporting winds of 65 to 85 MPH. Some of the higher winds included an 85 MPH wind gust in the Winterset area and numerous reports of 75 to 85 MPH winds from Madison, Dallas, Warren and Polk Counties. Lightning struck a house in Ankeny. The house was set on fire by the strike.
Event Narrative Iowa State storm chasers tracked a satellite tornado just south of the main EF-5 tornado. It was located in Grundy County.


All events for this episode:

Location County/Zone St. Date Time T.Z. Type Mag Dth Inj PrD CrD
Totals: 9 70 101.637M 233.00K
HOLMES WRIGHT CO. IA 05/25/2008 14:40 CST-6 Hail 1.25 in. 0 0 5.00K 0.00K
ALEXANDER FRANKLIN CO. IA 05/25/2008 14:58 CST-6 Hail 1.75 in. 0 0 10.00K 0.00K
DOWS WRIGHT CO. IA 05/25/2008 15:05 CST-6 Hail 0.88 in. 0 0 2.00K 0.00K
COULTER FRANKLIN CO. IA 05/25/2008 15:21 CST-6 Hail 1.00 in. 0 0 3.00K 0.00K
ROCKWELL CERRO GORDO CO. IA 05/25/2008 15:25 CST-6 Hail 1.75 in. 0 0 10.00K 0.00K
MASON CITY CERRO GORDO CO. IA 05/25/2008 15:26 CST-6 Hail 1.75 in. 0 0 10.00K 0.00K
CARTERSVILLE CERRO GORDO CO. IA 05/25/2008 15:36 CST-6 Hail 1.75 in. 0 0 10.00K 0.00K
CARTERSVILLE CERRO GORDO CO. IA 05/25/2008 15:40 CST-6 Hail 1.50 in. 0 0 5.00K 0.00K
FERN GRUNDY CO. IA 05/25/2008 15:48 CST-6 Tornado EF2 0 0 300.00K 2.00K
APLINGTON BUTLER CO. IA 05/25/2008 15:50 CST-6 Tornado EF5 9 50 75.000M 75.00K
STOUT GRUNDY CO. IA 05/25/2008 16:07 CST-6 Tornado EF0 0 0 1.00K 1.00K
BENSON BLACK HAWK CO. IA 05/25/2008 16:16 CST-6 Tornado EF2 0 20 25.000M 155.00K
NEW HARTFORD BUTLER CO. IA 05/25/2008 16:17 CST-6 Thunderstorm Wind 61 kts. EG 0 0 15.00K 0.00K
FINCHFORD BLACK HAWK CO. IA 05/25/2008 16:20 CST-6 Hail 4.25 in. 0 0 50.00K 0.00K
BOIES BLACK HAWK CO. IA 05/25/2008 16:23 CST-6 Hail 1.75 in. 0 0 10.00K 0.00K
JANESVILLE BREMER CO. IA 05/25/2008 16:23 CST-6 Hail 1.75 in. 0 0 10.00K 0.00K
NORTH CEDAR BLACK HAWK CO. IA 05/25/2008 16:25 CST-6 Thunderstorm Wind 70 kts. EG 0 0 100.00K 0.00K
BOIES BLACK HAWK CO. IA 05/25/2008 16:29 CST-6 Hail 1.00 in. 0 0 3.00K 0.00K
DENVER BREMER CO. IA 05/25/2008 16:31 CST-6 Hail 1.75 in. 0 0 10.00K 0.00K
(ALO)WATERLOO MUNI A BLACK HAWK CO. IA 05/25/2008 16:33 CST-6 Thunderstorm Wind 66 kts. MG 0 0 25.00K 0.00K
CEDAR CITY BLACK HAWK CO. IA 05/25/2008 16:33 CST-6 Hail 2.75 in. 0 0 25.00K 0.00K
WAVERLY BREMER CO. IA 05/25/2008 16:35 CST-6 Hail 0.88 in. 0 0 1.00K 0.00K
(ALO)WATERLOO MUNI A BLACK HAWK CO. IA 05/25/2008 16:37 CST-6 Thunderstorm Wind 81 kts. MG 0 0 50.00K 0.00K
BOIES BLACK HAWK CO. IA 05/25/2008 16:39 CST-6 Hail 4.00 in. 0 0 50.00K 0.00K
LACELLE CLARKE CO. IA 05/25/2008 16:59 CST-6 Hail 1.75 in. 0 0 10.00K 0.00K
WELDON CLARKE CO. IA 05/25/2008 17:25 CST-6 Tornado EF1 0 0 0.00K 0.00K
YALE GUTHRIE CO. IA 05/25/2008 18:20 CST-6 Hail 1.75 in. 0 0 10.00K 0.00K
LARLAND AUDUBON CO. IA 05/25/2008 18:24 CST-6 Hail 0.88 in. 0 0 1.00K 0.00K
FANSLERS GUTHRIE CO. IA 05/25/2008 18:50 CST-6 Hail 1.75 in. 0 0 5.00K 0.00K
FANSLERS GUTHRIE CO. IA 05/25/2008 18:58 CST-6 Hail 1.75 in. 0 0 5.00K 0.00K
FANSLERS GUTHRIE CO. IA 05/25/2008 18:59 CST-6 Hail 1.75 in. 0 0 5.00K 0.00K
RANDALL HAMILTON CO. IA 05/25/2008 19:00 CST-6 Hail 1.00 in. 0 0 5.00K 0.00K
RANDALL HAMILTON CO. IA 05/25/2008 19:04 CST-6 Hail 0.75 in. 0 0 0.00K 0.00K
GARDEN CITY HARDIN CO. IA 05/25/2008 19:17 CST-6 Hail 1.75 in. 0 0 10.00K 0.00K
GARDEN CITY HARDIN CO. IA 05/25/2008 19:17 CST-6 Thunderstorm Wind 61 kts. EG 0 0 15.00K 0.00K
SAYLORVILLE POLK CO. IA 05/25/2008 19:20 CST-6 Hail 1.00 in. 0 0 5.00K 0.00K
PARKERSBURG BUTLER CO. IA 05/25/2008 19:22 CST-6 Hail 1.00 in. 0 0 5.00K 0.00K
BOONE BOONE CO. IA 05/25/2008 19:23 CST-6 Hail 1.75 in. 0 0 10.00K 0.00K
NEW PROVIDENCE HARDIN CO. IA 05/25/2008 19:23 CST-6 Hail 0.88 in. 0 0 2.00K 0.00K
SAYLORVILLE POLK CO. IA 05/25/2008 19:24 CST-6 Hail 1.00 in. 0 0 3.00K 0.00K
BOONE MUNI ARPT BOONE CO. IA 05/25/2008 19:24 CST-6 Hail 1.00 in. 0 0 1.00K 0.00K
NEW PROVIDENCE HARDIN CO. IA 05/25/2008 19:25 CST-6 Thunderstorm Wind 61 kts. EG 0 0 20.00K 0.00K
ORALABOR POLK CO. IA 05/25/2008 19:25 CST-6 Hail 0.88 in. 0 0 1.00K 0.00K
ANKENY POLK CO. IA 05/25/2008 19:29 CST-6 Hail 1.00 in. 0 0 5.00K 0.00K
ANKENY POLK CO. IA 05/25/2008 19:32 CST-6 Hail 0.88 in. 0 0 1.00K 0.00K
NEW PROVIDENCE HARDIN CO. IA 05/25/2008 19:34 CST-6 Hail 1.75 in. 0 0 10.00K 0.00K
DODGE FLD ARPT POLK CO. IA 05/25/2008 19:43 CST-6 Hail 1.00 in. 0 0 5.00K 0.00K
ANKENY POLK CO. IA 05/25/2008 19:55 CST-6 Lightning 0 0 25.00K 0.00K
RIPPEY GREENE CO. IA 05/25/2008 19:55 CST-6 Thunderstorm Wind 69 kts. EG 0 0 25.00K 0.00K
BRIDGEWATER ADAIR CO. IA 05/25/2008 20:00 CST-6 Thunderstorm Wind 52 kts. EG 0 0 10.00K 0.00K
WIOTA CASS CO. IA 05/25/2008 20:03 CST-6 Hail 0.88 in. 0 0 1.00K 0.00K
AFTON UNION CO. IA 05/25/2008 20:03 CST-6 Thunderstorm Wind 55 kts. EG 0 0 3.00K 0.00K
CRESTON UNION CO. IA 05/25/2008 20:03 CST-6 Thunderstorm Wind 52 kts. MG 0 0 15.00K 0.00K
ATLANTIC ARPT CASS CO. IA 05/25/2008 20:04 CST-6 Thunderstorm Wind 50 kts. MG 0 0 0.00K 0.00K
ATLANTIC CASS CO. IA 05/25/2008 20:04 CST-6 Thunderstorm Wind 52 kts. EG 0 0 10.00K 0.00K
CEDAR FALLS BLACK HAWK CO. IA 05/25/2008 20:05 CST-6 Hail 1.00 in. 0 0 3.00K 0.00K
FONTANELLE ADAIR CO. IA 05/25/2008 20:06 CST-6 Thunderstorm Wind 63 kts. MG 0 0 20.00K 0.00K
(DSM)DES MOINES INTL POLK CO. IA 05/25/2008 20:10 CST-6 Hail 1.75 in. 0 0 10.00K 0.00K
ORIENT ADAIR CO. IA 05/25/2008 20:10 CST-6 Thunderstorm Wind 57 kts. EG 0 0 10.00K 0.00K
BOONEVILLE DALLAS CO. IA 05/25/2008 20:12 CST-6 Hail 0.88 in. 0 0 3.00K 0.00K
FT DES MOINES POLK CO. IA 05/25/2008 20:17 CST-6 Hail 1.75 in. 0 0 20.00K 0.00K
FT DES MOINES POLK CO. IA 05/25/2008 20:19 CST-6 Hail 1.00 in. 0 0 3.00K 0.00K
BONDURANT POLK CO. IA 05/25/2008 20:21 CST-6 Hail 1.00 in. 0 0 3.00K 0.00K
CONRAD GRUNDY CO. IA 05/25/2008 20:23 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
ARBOR HILL ADAIR CO. IA 05/25/2008 20:24 CST-6 Thunderstorm Wind 55 kts. EG 0 0 15.00K 0.00K
GLADBROOK TAMA CO. IA 05/25/2008 20:25 CST-6 Hail 1.00 in. 0 0 5.00K 0.00K
HOWE ADAIR CO. IA 05/25/2008 20:26 CST-6 Thunderstorm Wind 66 kts. MG 0 0 25.00K 0.00K
BEAMAN GRUNDY CO. IA 05/25/2008 20:28 CST-6 Hail 0.88 in. 0 0 3.00K 0.00K
VIOLA CENTER AUDUBON CO. IA 05/25/2008 20:30 CST-6 Thunderstorm Wind 57 kts. EG 0 0 10.00K 0.00K
WINTERSET MADISON CO. IA 05/25/2008 20:33 CST-6 Thunderstorm Wind 61 kts. EG 0 0 15.00K 0.00K
STUART GUTHRIE CO. IA 05/25/2008 20:34 CST-6 Thunderstorm Wind 55 kts. MG 0 0 15.00K 0.00K
BAGLEY GUTHRIE CO. IA 05/25/2008 20:35 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
WINTERSET MADISON CO. IA 05/25/2008 20:40 CST-6 Thunderstorm Wind 74 kts. EG 0 0 50.00K 0.00K
BAGLEY GUTHRIE CO. IA 05/25/2008 20:40 CST-6 Thunderstorm Wind 57 kts. EG 0 0 10.00K 0.00K
EARLHAM MADISON CO. IA 05/25/2008 20:40 CST-6 Thunderstorm Wind 57 kts. EG 0 0 10.00K 0.00K
BAGLEY GUTHRIE CO. IA 05/25/2008 20:45 CST-6 Thunderstorm Wind 57 kts. EG 0 0 10.00K 0.00K
HERNDON GUTHRIE CO. IA 05/25/2008 20:45 CST-6 Thunderstorm Wind 61 kts. EG 0 0 15.00K 0.00K
HERNDON GUTHRIE CO. IA 05/25/2008 20:45 CST-6 Thunderstorm Wind 52 kts. EG 0 0 10.00K 0.00K
ARBOR HILL ADAIR CO. IA 05/25/2008 20:50 CST-6 Thunderstorm Wind 55 kts. MG 0 0 10.00K 0.00K
DAWSON DALLAS CO. IA 05/25/2008 20:51 CST-6 Thunderstorm Wind 69 kts. EG 0 0 20.00K 0.00K
GARWIN TAMA CO. IA 05/25/2008 20:52 CST-6 Funnel Cloud 0 0 0.00K 0.00K
TRAER MUNI ARPT TAMA CO. IA 05/25/2008 20:52 CST-6 Hail 1.00 in. 0 0 3.00K 0.00K
NORWALK WARREN CO. IA 05/25/2008 20:52 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
MARTENSDALE WARREN CO. IA 05/25/2008 20:55 CST-6 Thunderstorm Wind 61 kts. EG 0 0 40.00K 0.00K
(DSM)DES MOINES INTL POLK CO. IA 05/25/2008 20:57 CST-6 Thunderstorm Wind 56 kts. MG 0 0 5.00K 0.00K
SCOTCH RIDGE WARREN CO. IA 05/25/2008 20:57 CST-6 Thunderstorm Wind 61 kts. EG 0 0 5.00K 0.00K
(DSM)DES MOINES INTL POLK CO. IA 05/25/2008 21:00 CST-6 Thunderstorm Wind 67 kts. MG 0 0 20.00K 0.00K
DES MOINES POLK CO. IA 05/25/2008 21:00 CST-6 Thunderstorm Wind 52 kts. EG 0 0 3.00K 0.00K
INDIANOLA WARREN CO. IA 05/25/2008 21:00 CST-6 Thunderstorm Wind 68 kts. MG 0 0 30.00K 0.00K
DES MOINES POLK CO. IA 05/25/2008 21:03 CST-6 Thunderstorm Wind 65 kts. MG 0 0 20.00K 0.00K
BERKLEY BOONE CO. IA 05/25/2008 21:04 CST-6 Thunderstorm Wind 57 kts. EG 0 0 10.00K 0.00K
LACONA WARREN CO. IA 05/25/2008 21:06 CST-6 Thunderstorm Wind 57 kts. EG 0 0 5.00K 0.00K
LINEVILLE WAYNE CO. IA 05/25/2008 21:15 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
DES MOINES POLK CO. IA 05/25/2008 21:16 CST-6 Thunderstorm Wind 61 kts. EG 0 0 10.00K 0.00K
DANA GREENE CO. IA 05/25/2008 21:16 CST-6 Thunderstorm Wind 61 kts. EG 0 0 10.00K 0.00K
NORWALK WARREN CO. IA 05/25/2008 21:16 CST-6 Thunderstorm Wind 61 kts. EG 0 0 5.00K 0.00K
ANKENY POLK CO. IA 05/25/2008 21:18 CST-6 Thunderstorm Wind 52 kts. EG 0 0 5.00K 0.00K
DES MOINES POLK CO. IA 05/25/2008 21:20 CST-6 Thunderstorm Wind 65 kts. EG 0 0 15.00K 0.00K
COLFAX JASPER CO. IA 05/25/2008 21:32 CST-6 Thunderstorm Wind 65 kts. MG 0 0 25.00K 0.00K
SEYMOUR WAYNE CO. IA 05/25/2008 21:33 CST-6 Thunderstorm Wind 52 kts. EG 0 0 15.00K 0.00K
NEWTON JASPER CO. IA 05/25/2008 21:34 CST-6 Thunderstorm Wind 51 kts. MG 0 0 5.00K 0.00K
PELLA MARION CO. IA 05/25/2008 21:34 CST-6 Thunderstorm Wind 51 kts. MG 0 0 5.00K 0.00K
MORAVIA APPANOOSE CO. IA 05/25/2008 21:42 CST-6 Thunderstorm Wind 57 kts. EG 0 0 20.00K 0.00K
CENTERVILLE APPANOOSE CO. IA 05/25/2008 21:44 CST-6 Thunderstorm Wind 52 kts. EG 0 0 15.00K 0.00K
OSKALOOSA MAHASKA CO. IA 05/25/2008 21:50 CST-6 Thunderstorm Wind 57 kts. EG 0 0 10.00K 0.00K
UNIVERSITY PARK MAHASKA CO. IA 05/25/2008 21:52 CST-6 Thunderstorm Wind 65 kts. EG 0 0 10.00K 0.00K
MONTEZUMA POWESHIEK CO. IA 05/25/2008 21:53 CST-6 Thunderstorm Wind 51 kts. MG 0 0 2.00K 0.00K
OSKALOOSA MAHASKA CO. IA 05/25/2008 21:55 CST-6 Thunderstorm Wind 61 kts. EG 0 0 10.00K 0.00K
OSKALOOSA MAHASKA CO. IA 05/25/2008 21:57 CST-6 Heavy Rain 0 0 0.00K 0.00K
BROOKLYN POWESHIEK CO. IA 05/25/2008 21:57 CST-6 Thunderstorm Wind 51 kts. MG 0 0 3.00K 0.00K
MONTEZUMA POWESHIEK CO. IA 05/25/2008 22:00 CST-6 Thunderstorm Wind 50 kts. MG 0 0 0.00K 0.00K
OSKALOOSA MAHASKA CO. IA 05/25/2008 22:00 CST-6 Thunderstorm Wind 61 kts. EG 0 0 50.00K 0.00K
AVERY MONROE CO. IA 05/25/2008 22:02 CST-6 Hail 1.25 in. 0 0 3.00K 0.00K
FREMONT MAHASKA CO. IA 05/25/2008 22:10 CST-6 Thunderstorm Wind 61 kts. EG 0 0 25.00K 0.00K
OTTUMWA WAPELLO CO. IA 05/25/2008 22:18 CST-6 Thunderstorm Wind 50 kts. EG 0 0 10.00K 0.00K
Totals: 9 70 101.637M 233.00K