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Storm Events Database
Event Details
| Event | Thunderstorm Wind |
| Magnitude | 61 kts. |
| State | IOWA |
| County/Area | GRUNDY |
| WFO | DMX |
| Begin Date | 07/18/2007 16:50:00 CST-6 |
| Begin Range | 2 |
| Begin Azimuth | S |
| Begin Location | WELLSBURG |
| Begin Lat/Lon | 42.4/-92.92 |
| End Date | 07/18/2007 16:50:00 CST-6 |
| Deaths Direct/Indirect | 0/0 (fatality details below, when available...) |
| Injuries Direct/Indirect | 0/0 |
| Property Damage | 5.00K |
| Crop Damage | 10.00K |
| Episode Narrative | Several boundaries were in position across the state with the main|boundary being that left from the previous nights convection from|northwest into east central Iowa. At the same time, a cold front|approached the state from the northwest while low pressure developed|over eastern Nebraska. The atmosphere became very unstable by the early|afternoon hours with CAPE values in the 3000 to 4500 J/kg range and|lifted indices falling to between -7 and -10 C. Shear across the north|half of Iowa was in the 30 to 40 kt range. During the afternoon,|temperatures rose into the upper 80s to mid 90s, as dew point readings|rebounded in to the mid to upper 70s along the boundary. Thunderstorms|erupted by mid afternoon with a large area of thunderstorms moving from|northwest into parts of north central and eventually in to east central|Iowa. The main mode of severe weather was high winds. There was|between 900 and 1100 J/kg of DCAPE available with fairly strong winds in|the mid levels. Reports of downed trees and power lines were numerous|with wind gust reaching 70 MPH or more with some of the stronger|storms. There was little in the way of hail reported, though pea to|small marble size hail was common. The available cape in the hail|layer, -10 to -30 C. layer of the atmosphere, was significant in the 400|to 600 J/kg range, but the freezing level was very high. Typical of mid|July, the freezing level was between 14,000 and 15,000 feet, which|limited hail production. The storms moved east-southeast at 35 to 45|MPH for the most part with the first round exiting the DMX CWA by early|evening. Thunderstorms began to redevelop during the evening. One of the storms produced penny size hail in the Marshalltown area. |
| Event Narrative |
All events for this episode:
| Location | County/Zone | St. | Date | Time | T.Z. | Type | Mag | Dth | Inj | PrD | CrD |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Totals: | 0 | 0 | 328.00K | 228.00K | |||||||
| BANCROFT | KOSSUTH CO. | IA | 07/18/2007 | 15:00 | CST-6 | Thunderstorm Wind | 57 kts. EG | 0 | 0 | 15.00K | 5.00K |
| POMEROY | CALHOUN CO. | IA | 07/18/2007 | 15:22 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 5.00K | 0.00K |
| MANSON | CALHOUN CO. | IA | 07/18/2007 | 15:30 | CST-6 | Thunderstorm Wind | 61 kts. EG | 0 | 0 | 10.00K | 5.00K |
| DAKOTA CITY | HUMBOLDT CO. | IA | 07/18/2007 | 15:31 | CST-6 | Thunderstorm Wind | 61 kts. EG | 0 | 0 | 15.00K | 5.00K |
| DAKOTA CITY | HUMBOLDT CO. | IA | 07/18/2007 | 15:32 | CST-6 | Thunderstorm Wind | 61 kts. EG | 0 | 0 | 15.00K | 25.00K |
| MANSON | CALHOUN CO. | IA | 07/18/2007 | 15:33 | CST-6 | Thunderstorm Wind | 61 kts. EG | 0 | 0 | 15.00K | 5.00K |
| FT DODGE | WEBSTER CO. | IA | 07/18/2007 | 15:45 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 15.00K | 0.00K |
| CALLENDER | WEBSTER CO. | IA | 07/18/2007 | 15:53 | CST-6 | Thunderstorm Wind | 57 kts. EG | 0 | 0 | 20.00K | 5.00K |
| CALLENDER | WEBSTER CO. | IA | 07/18/2007 | 15:53 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 5.00K | 0.00K |
| EAGLE GROVE | WRIGHT CO. | IA | 07/18/2007 | 16:16 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 5.00K | 0.00K |
| WILLIAMS | HAMILTON CO. | IA | 07/18/2007 | 16:18 | CST-6 | Thunderstorm Wind | 61 kts. EG | 0 | 0 | 5.00K | 5.00K |
| BLAIRSBURG | HAMILTON CO. | IA | 07/18/2007 | 16:20 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 5.00K | 0.00K |
| RADCLIFFE | HARDIN CO. | IA | 07/18/2007 | 16:35 | CST-6 | Thunderstorm Wind | 50 kts. EG | 0 | 0 | 3.00K | 0.00K |
| ELDORA | HARDIN CO. | IA | 07/18/2007 | 16:39 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 10.00K | 0.00K |
| ZEARING | STORY CO. | IA | 07/18/2007 | 16:47 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 5.00K | 10.00K |
| WELLSBURG | GRUNDY CO. | IA | 07/18/2007 | 16:50 | CST-6 | Thunderstorm Wind | 61 kts. EG | 0 | 0 | 5.00K | 10.00K |
| IOWA CENTER | STORY CO. | IA | 07/18/2007 | 17:00 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 2.00K | 5.00K |
| HOLLAND | GRUNDY CO. | IA | 07/18/2007 | 17:00 | CST-6 | Thunderstorm Wind | 50 kts. EG | 0 | 0 | 5.00K | 0.00K |
| STATE CENTER | MARSHALL CO. | IA | 07/18/2007 | 17:06 | CST-6 | Thunderstorm Wind | 65 kts. EG | 0 | 0 | 30.00K | 50.00K |
| MARSHALLTOWN | MARSHALL CO. | IA | 07/18/2007 | 17:07 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 10.00K | 0.00K |
| GARWIN | TAMA CO. | IA | 07/18/2007 | 17:11 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 5.00K | 3.00K |
| BUCKINGHAM | TAMA CO. | IA | 07/18/2007 | 17:15 | CST-6 | Thunderstorm Wind | 57 kts. EG | 0 | 0 | 20.00K | 10.00K |
| REINBECK | GRUNDY CO. | IA | 07/18/2007 | 17:15 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 5.00K | 0.00K |
| MORRISON | GRUNDY CO. | IA | 07/18/2007 | 17:15 | CST-6 | Thunderstorm Wind | 61 kts. EG | 0 | 0 | 20.00K | 5.00K |
| GRUNDY CENTER | GRUNDY CO. | IA | 07/18/2007 | 17:15 | CST-6 | Thunderstorm Wind | 57 kts. EG | 0 | 0 | 20.00K | 0.00K |
| MARSHALLTOWN | MARSHALL CO. | IA | 07/18/2007 | 17:18 | CST-6 | Thunderstorm Wind | 52 kts. MG | 0 | 0 | 3.00K | 50.00K |
| LA PORTE CITY ARPT | BLACK HAWK CO. | IA | 07/18/2007 | 17:25 | CST-6 | Thunderstorm Wind | 56 kts. EG | 0 | 0 | 30.00K | 10.00K |
| GRINNELL ARPT | POWESHIEK CO. | IA | 07/18/2007 | 17:40 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 5.00K | 0.00K |
| MONTEZUMA | POWESHIEK CO. | IA | 07/18/2007 | 18:20 | CST-6 | Thunderstorm Wind | 56 kts. MG | 0 | 0 | 10.00K | 5.00K |
| MARSHALLTOWN | MARSHALL CO. | IA | 07/18/2007 | 21:05 | CST-6 | Hail | 0.75 in. | 0 | 0 | 0.00K | 10.00K |
| ODEBOLT | SAC CO. | IA | 07/18/2007 | 22:05 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 10.00K | 5.00K |
| Totals: | 0 | 0 | 328.00K | 228.00K |
