Storm Events Database
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Storm Events Database
Event Details:
| Event | Tornado |
| -- Scale | EF1 |
| -- Length | 1.7 Miles |
| -- Width | 30 Yards |
| State | IOWA |
| County/Area | JACKSON |
| WFO | DVN |
| Report Source | NWS Storm Survey |
| NCEI Data Source | CSV |
| Begin Date | 2021-06-20 19:06 CST-6 |
| Begin Location | 2W GARRY OWEN |
| Begin Lat/Lon | 42.28/-90.85 |
| End Date | 2021-06-20 19:09 CST-6 |
| End Location | 1N GARRY OWEN |
| End Lat/Lon | 42.2949/-90.8235 |
| Deaths Direct/Indirect | 0/0 (fatality details below, when available...) |
| Injuries Direct/Indirect | 0/0 |
| Property Damage | 0.00K |
| Crop Damage | 0.00K |
| Episode Narrative | Severe thunderstorms developed across Iowa, Illinois and Missouri on Sunday, June 20th. Early in the morning, an MCS from the night before moved into our area along a stationary boundary and brought widespread rain showers to the area. This died off early in the day and then some clear skies moved in, providing some surface heating ahead of an approaching cold front. Ahead of this front, several discrete supercell thunderstorms formed, which posed a threat for tornadoes, hail, and severe wind gusts. Later in the day. these supercells generally grew upscale into a line of thunderstorms with embedded supercell structures. A tornado was spotted near Bernard, Iowa and lead to some damage to trees and farm outbuildings. Otherwise, severe winds reports and a few hail reports resulted from these storms. The severe threat continued eastward, and heavily impacted some suburbs of Chicago. |
| Event Narrative | A tornado developed just west of Garry Owen in northwest Jackson County, and moved northeast along an intermittent 3 mile path through farm fields, lifting east of Bernard in southern Dubuque County. The tornado caused tree damage, and extensive damage to outbuildings at 4 farmsteads. The tornado was rated EF1, with maximum winds estimated at 90 to 100 mph, and was on the ground for about 6 minutes. There were no injuries. Assistance provided by Dubuque and Jackson County Emergency Management is much appreciated. |
Event Map:
Note: The tornado track is approximate based on the beginning (B) and ending (E) locations. The actual tornado path may differ from a straight line.
All events for this episode:
| Location | County/Zone | St. | Date | Time | T.Z. | Type | Mag | Dth | Inj | PrD | CrD |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Totals: | 0 | 0 | 0.00K | 0.00K | |||||||
| MANCHESTER | DELAWARE CO. | IA | 06/20/2021 | 18:20 | CST-6 | Thunderstorm Wind | 50 kts. EG | 0 | 0 | 0.00K | 0.00K |
| GARRY OWEN | JACKSON CO. | IA | 06/20/2021 | 19:06 | CST-6 | Tornado | EF1 | 0 | 0 | 0.00K | 0.00K |
| BERNARD | DUBUQUE CO. | IA | 06/20/2021 | 19:09 | CST-6 | Tornado | EF1 | 0 | 0 | 0.00K | 0.00K |
| WASHINGTON | WASHINGTON CO. | IA | 06/20/2021 | 19:47 | CST-6 | Hail | 1.25 in. | 0 | 0 | 0.00K | 0.00K |
| WASHINGTON | WASHINGTON CO. | IA | 06/20/2021 | 19:59 | CST-6 | Thunderstorm Wind | 56 kts. EG | 0 | 0 | 0.00K | 0.00K |
| Totals: | 0 | 0 | 0.00K | 0.00K |
