Storm Events Database

Event Details

Event Hail
Magnitude 0.88 in.
State IOWA
County/Area GRUNDY
WFO DMX
Report Source Trained Spotter
NCDC Data Source CSV
Begin Date 2007-04-03 01:25:00.0 CST-6
Begin Location 1NW WELLSBURG
Begin Lat/Lon 42.44/-92.93
End Date 2007-04-03 01:25:00.0 CST-6
Deaths Direct/Indirect 0/0 (fatality details below, when available...)
Injuries Direct/Indirect 0/0
Property Damage 1.00K
Crop Damage 0.00K
Episode Narrative A strong storm system lifted east-northeast across the central U.S. during the overnight hours of 2-3 April. Low pressure developed over eastern Colorado and advanced across Kansas into Iowa. A warm front extended east from the low and lifted northward into southern Iowa during the overnight hours. Very strong theta-e advection took place during the evening north of the warm front as the low level jet increased to between 50 and 60 kts. Though surface based CAPE was limited, elevated CAPE from around 750 mb was near 2500 J/kg with a lifted index from that level of -8 C. With the relatively dry air in the lower levels, the tornado threat was limited with the LCL in the 1500 plus meter range. There was considerable shear available with effective shear values in the 50 to 60 kt range. With much of the CAPE elevated in nature, there was a fair amount of CAPE in the -10 to -30 C. layer of the atmosphere with a little over 200 J/kg available. Thunderstorms erupted first during the mid evening hours to the north of the warm front as moisture moved into the area. They developed very rapidly. At the same time, an intense bow echo developed over western Nebraska and raced east. During the late evening hours, the storms north of the warm front became very numerous and diminished in intensity. As the bow echo approached from Nebraska, the enhanced low level jet ahead of it fired up another round of severe thunderstorms along and north of the warm front. The thunderstorms that formed north of the warm front were prolific hail producers. There were numerous reports of hail covering the ground with these storms in both the mid evening and early morning rounds of storms. Much of the hail was one half inch or less in diameter however. Nearly all of the storms produced at least some hail and many did pulse to severe levels occasionally. Hail reports were quite numerous with hail size in the three quarter to 1 inch diameter range. One storm produced golf ball size hail in Black Hawk County near Hudson. As the bow echo moved into western Iowa from Nebraska, wind became the more significant threat. The system weakened as it moved into Iowa, but did produce a widespread area of winds of 40 to 50 MPH. Spotty damage occurred with the bow echo with a wind gust of 61 MPH in Adair County at Adair. The storms produced spotty hail as well with the largest reported in Mahaska County east of Oskaloosa, where golf ball size hail fell.
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 57.00K 0.00K
(FOD)FT DODGE MUNI A WEBSTER CO. IA 04/02/2007 20:06 CST-6 Hail 1.00 in. 0 0 3.00K 0.00K
(FOD)FT DODGE MUNI A WEBSTER CO. IA 04/02/2007 20:13 CST-6 Hail 1.00 in. 0 0 3.00K 0.00K
VINCENT WEBSTER CO. IA 04/02/2007 20:14 CST-6 Hail 0.88 in. 0 0 1.00K 0.00K
LAKE CITY CALHOUN CO. IA 04/02/2007 20:45 CST-6 Hail 0.88 in. 0 0 1.00K 0.00K
DUNCOMBE WEBSTER CO. IA 04/02/2007 20:53 CST-6 Hail 0.88 in. 0 0 1.00K 0.00K
HAMPTON MUNI ARPT FRANKLIN CO. IA 04/02/2007 21:00 CST-6 Hail 0.88 in. 0 0 1.00K 0.00K
ELLSWORTH HAMILTON CO. IA 04/02/2007 21:02 CST-6 Hail 1.00 in. 0 0 3.00K 0.00K
WILLIAMS HAMILTON CO. IA 04/02/2007 21:04 CST-6 Hail 1.00 in. 0 0 5.00K 0.00K
IOWA FALLS HARDIN CO. IA 04/02/2007 21:25 CST-6 Hail 1.00 in. 0 0 3.00K 0.00K
EVANSDALE BLACK HAWK CO. IA 04/02/2007 21:36 CST-6 Hail 0.88 in. 0 0 1.00K 0.00K
ORANGE BLACK HAWK CO. IA 04/02/2007 21:40 CST-6 Hail 1.75 in. 0 0 15.00K 0.00K
IOWA FALLS HARDIN CO. IA 04/02/2007 21:45 CST-6 Hail 1.00 in. 0 0 3.00K 0.00K
DUMONT BUTLER CO. IA 04/02/2007 22:00 CST-6 Hail 0.88 in. 0 0 1.00K 0.00K
CEDAR FALLS ARPT BLACK HAWK CO. IA 04/02/2007 22:15 CST-6 Hail 0.75 in. 0 0 0.00K 0.00K
AUDUBON AUDUBON CO. IA 04/03/2007 00:45 CST-6 Hail 0.88 in. 0 0 1.00K 0.00K
FLETCHER CHAPEL CASS CO. IA 04/03/2007 00:50 CST-6 Hail 0.88 in. 0 0 1.00K 0.00K
AUDUBON AUDUBON CO. IA 04/03/2007 00:53 CST-6 Hail 0.75 in. 0 0 0.00K 0.00K
STEAMBOAT ROCK HARDIN CO. IA 04/03/2007 01:06 CST-6 Hail 0.88 in. 0 0 1.00K 0.00K
ADAIR ADAIR CO. IA 04/03/2007 01:11 CST-6 Thunderstorm Wind 53 kts. MG 0 0 0.00K 0.00K
WELLSBURG GRUNDY CO. IA 04/03/2007 01:25 CST-6 Hail 0.88 in. 0 0 1.00K 0.00K
DALLAS CENTER DALLAS CO. IA 04/03/2007 01:40 CST-6 Hail 0.75 in. 0 0 0.00K 0.00K
SAYLORVILLE POLK CO. IA 04/03/2007 01:56 CST-6 Hail 0.88 in. 0 0 1.00K 0.00K
OTTUMWA WAPELLO CO. IA 04/03/2007 03:31 CST-6 Hail 0.88 in. 0 0 1.00K 0.00K
KEOMAH MAHASKA CO. IA 04/03/2007 03:32 CST-6 Hail 1.75 in. 0 0 10.00K 0.00K
Totals: 0 0 57.00K 0.00K