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Storm Events Database
Event Details
| Event | Thunderstorm Wind |
| Magnitude | 61 kts. |
| State | IOWA |
| County/Area | GRUNDY |
| WFO | DMX |
| Begin Date | 06/25/2010 21:31:00 CST-6 |
| Begin Range | 6 |
| Begin Azimuth | N |
| Begin Location | WELLSBURG |
| Begin Lat/Lon | 42.51/-92.91 |
| End Date | 06/25/2010 21:31:00 CST-6 |
| Deaths Direct/Indirect | 0/0 (fatality details below, when available...) |
| Injuries Direct/Indirect | 0/0 |
| Property Damage | 3.00K |
| Crop Damage | 0.00K |
| Episode Narrative | A very unstable airmass was in place over western Iowa and areas to the west. CAPE rose to over 6500 J/kg by late afternoon with the lifted indices falling to -12 to -15 C. Downdraft CAPE as quite high at around 1600 J/kg, while available CAPE in the -10 to -30 C layer of the atmosphere was between 700 and 1000 J/kg. The atmosphere had a strong shear present with 40 to 60 kts The freezing level was quite high, just below 15,000 feet. Precipitable water increased to around 1.5 inches. Strong thunderstorms developed over southern Minnesota. Initially, the thunderstorms moved east. Once they became more rooted in the boundary layer, they moved southeast and propagated nearly due south. The main severe threat was high winds, with numerous reports of tree, power line, and grain bin damage. Winds of 70 MPH were measured in Estherville for example. Seventy MPH winds were reported in Grundy County. The outflow boundary from the complex continued to move southeast, and actually moved all the way into Missouri. Scattered severe weather occurred with this. Seven power poles were snapped in Polk County by the high winds. A wind gust of 62 MPH occurred at the Ottumwa Airport. Flash flooding also became a problem with the antecedent soil conditions nearly saturated. Flash flooding in Emmet County resulted in the closing of Highway 4 near Wallingford and evacuations in the city. A secondary area of thunderstorms formed over northwest Iowa and moved east-southeast into the CWA. Heavy rains caused minor urban flooding in Calhoun County with 6 inches of standing water reported in the city of Pomeroy. Although many of the storms produced small hail, there were very few reports of hail larger than dime size. Reports of hail up to an inch in diameter were received in central Iowa late in the evolution of the system. Lightning struck a house east of Grinnell during the early morning hours around 0330 CST. The house was set on fire with structural damage and damage to contents estimated at $550,000. |
| Event Narrative | Local law enforcement reports 70 MPH wind 3 miles south of the Butler County line 6 miles east of the Hardin County line. |
All events for this episode:
| Location | County/Zone | St. | Date | Time | T.Z. | Type | Mag | Dth | Inj | PrD | CrD |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Totals: | 0 | 0 | 1.931M | 10.00K | |||||||
| SILVER LAKE | WORTH CO. | IA | 06/25/2010 | 19:45 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 2.00K | 0.00K |
| LAKE MILLS | WINNEBAGO CO. | IA | 06/25/2010 | 19:50 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 5.00K | 0.00K |
| TENOLD | WORTH CO. | IA | 06/25/2010 | 19:55 | CST-6 | Thunderstorm Wind | 50 kts. EG | 0 | 0 | 2.00K | 0.00K |
| DOLLIVER | EMMET CO. | IA | 06/25/2010 | 20:00 | CST-6 | Thunderstorm Wind | 57 kts. EG | 0 | 0 | 15.00K | 0.00K |
| ESTHERVILLE | EMMET CO. | IA | 06/25/2010 | 20:29 | CST-6 | Thunderstorm Wind | 61 kts. MG | 0 | 0 | 5.00K | 0.00K |
| WALLINGFORD | EMMET CO. | IA | 06/25/2010 | 20:44 | CST-6 | Thunderstorm Wind | 61 kts. EG | 0 | 0 | 50.00K | 0.00K |
| AREDALE | BUTLER CO. | IA | 06/25/2010 | 21:00 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 2.00K | 0.00K |
| DOWS | WRIGHT CO. | IA | 06/25/2010 | 21:11 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 10.00K | 0.00K |
| ALGONA | KOSSUTH CO. | IA | 06/25/2010 | 21:14 | CST-6 | Thunderstorm Wind | 57 kts. MG | 0 | 0 | 5.00K | 0.00K |
| GRAETTINGER | PALO ALTO CO. | IA | 06/25/2010 | 21:15 | CST-6 | Thunderstorm Wind | 54 kts. EG | 0 | 0 | 15.00K | 0.00K |
| CLARION | WRIGHT CO. | IA | 06/25/2010 | 21:23 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 15.00K | 0.00K |
| EMMETSBURG | PALO ALTO CO. | IA | 06/25/2010 | 21:25 | CST-6 | Thunderstorm Wind | 57 kts. EG | 0 | 0 | 15.00K | 0.00K |
| OAKLAND | FRANKLIN CO. | IA | 06/25/2010 | 21:27 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 10.00K | 0.00K |
| POPEJOY | FRANKLIN CO. | IA | 06/25/2010 | 21:29 | CST-6 | Thunderstorm Wind | 57 kts. EG | 0 | 0 | 50.00K | 0.00K |
| OAKLAND | FRANKLIN CO. | IA | 06/25/2010 | 21:30 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 5.00K | 0.00K |
| WELLSBURG | GRUNDY CO. | IA | 06/25/2010 | 21:31 | CST-6 | Thunderstorm Wind | 61 kts. EG | 0 | 0 | 3.00K | 0.00K |
| IOWA FALLS | HARDIN CO. | IA | 06/25/2010 | 21:36 | CST-6 | Thunderstorm Wind | 56 kts. EG | 0 | 0 | 5.00K | 0.00K |
| NEW HARTFORD | BUTLER CO. | IA | 06/25/2010 | 21:39 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 3.00K | 0.00K |
| STEAMBOAT ROCK | HARDIN CO. | IA | 06/25/2010 | 21:45 | CST-6 | Thunderstorm Wind | 50 kts. MG | 0 | 0 | 2.00K | 0.00K |
| CLARION | WRIGHT CO. | IA | 06/25/2010 | 22:14 | CST-6 | Heavy Rain | 0 | 0 | 0.00K | 0.00K | |
| NEVADA | STORY CO. | IA | 06/25/2010 | 22:27 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 5.00K | 0.00K |
| WALLINGFORD | EMMET CO. | IA | 06/25/2010 | 22:28 | CST-6 | Heavy Rain | 0 | 0 | 0.00K | 0.00K | |
| WELLINGFORD | EMMET CO. | IA | 06/25/2010 | 22:40 | CST-6 | Flash Flood | 0 | 0 | 150.00K | 0.00K | |
| ORALABOR | POLK CO. | IA | 06/25/2010 | 23:05 | CST-6 | Thunderstorm Wind | 69 kts. EG | 0 | 0 | 25.00K | 0.00K |
| HOLMES | WRIGHT CO. | IA | 06/25/2010 | 23:15 | CST-6 | Flash Flood | 0 | 0 | 100.00K | 0.00K | |
| DALLAS CENTER | DALLAS CO. | IA | 06/25/2010 | 23:30 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 25.00K | 0.00K |
| (OTM)OTTUMWA INDSTRL | WAPELLO CO. | IA | 06/26/2010 | 00:14 | CST-6 | Thunderstorm Wind | 54 kts. MG | 0 | 0 | 2.00K | 0.00K |
| POMEROY | CALHOUN CO. | IA | 06/26/2010 | 01:24 | CST-6 | Heavy Rain | 0 | 0 | 50.00K | 0.00K | |
| WELLINGFORD | EMMET CO. | IA | 06/26/2010 | 02:45 | CST-6 | Flash Flood | 0 | 0 | 500.00K | 0.00K | |
| GRINNELL | POWESHIEK CO. | IA | 06/26/2010 | 03:30 | CST-6 | Lightning | 0 | 0 | 550.00K | 0.00K | |
| AMES | STORY CO. | IA | 06/26/2010 | 03:32 | CST-6 | Hail | 0.88 in. | 0 | 0 | 0.00K | 5.00K |
| HUMBOLDT MUNI ARPT | HUMBOLDT CO. | IA | 06/26/2010 | 05:00 | CST-6 | Flood | 0 | 0 | 300.00K | 0.00K | |
| DAKOTA CITY | HUMBOLDT CO. | IA | 06/26/2010 | 05:48 | CST-6 | Heavy Rain | 0 | 0 | 0.00K | 0.00K | |
| FT DODGE | WEBSTER CO. | IA | 06/26/2010 | 06:35 | CST-6 | Heavy Rain | 0 | 0 | 0.00K | 0.00K | |
| INDIANOLA | WARREN CO. | IA | 06/26/2010 | 07:07 | CST-6 | Hail | 1.00 in. | 0 | 0 | 5.00K | 5.00K |
| Totals: | 0 | 0 | 1.931M | 10.00K |
