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Storm Events Database
Event Details
| Event | Hail |
| Magnitude | 0.88 in. |
| State | IOWA |
| County/Area | GRUNDY |
| WFO | DMX |
| Begin Date | 04/03/2007 01:25:00 CST-6 |
| Begin Range | 1 |
| Begin Azimuth | NW |
| Begin Location | WELLSBURG |
| Begin Lat/Lon | 42.44/-92.93 |
| End Date | 04/03/2007 01:25:00 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 |
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 |
