National Weather Service United States Department of Commerce
Radar loop of the tornado event. The top left image is base reflectivity (Z) and the top right image is storm-relative velocity (SRV). The bottom two images are correlation coefficient (CC) and spectrum width (SW). Low values of CC, combined with a SRV couplet or on a convergence zone, are a strong indicator of debris being lofted by a tornado. High values of SW can also denote the presence of a circulation.

Total Iowa Tornadoes: 28

EF0 (6)
EF1 (9)
EF2 (0)
EF3 (0)
EF4 (0)
EF5 (0)
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This page will be updated as time and resources allow and may not contain information from recent events
Information last updated on 01/06/2021

Above is a map of the tornadoes that occurred across Iowa in 2020. Mouse over each icon to view more information on that tornado, which will appear in the box to the right. A season summary and table of these tornadoes is provided below. Detailed KMZ files for many of the tracks can be downloaded and viewed in Google Earth by clicking on the appropriate icon in the table below. To download the full year map shown above, click the download button below.

Please note: Track lines and contours are often interpolated and may not encompass the full extent of the damage. Surveying procedures vary between NWS offices. Downloadable tracks may not be available for weak tornadoes that were not surveyed.

*EFU - EF Unknown rating. This is used in instances that a tornado does not impact damage indicators used to assigned an EF rating.

2020 Iowa Tornado Summary  

The 2020 tornado season kicked off on March 28th, with nine tornadoes across central and eastern Iowa. Most damage was to trees and sheds or outbuildings, however in Oelwein multiple apartment buildings sustained significant damage. It would then be nearly two months before another tornado occurred in Iowa. Five tornadoes occurred on May 23rd with the two strongest occurring to the southeast of Cedar Rapids. On May 25th, Memorial Day, a single tornado went through Johnston in the Des Moines metro. While it went through a fairly populated area, nearly all reported damage was to trees and power line poles rather than homes and businesses. The next day brought seven more tornadoes, with another occurring in a suburb of Des Moines - this time in Waukee. This tornado caused minor damage to a church before moving into open farmland. The strongest tornado of the day occurred south of Eagle Grove, resulting in significant tree damage and destroying a large machine shed.  The next tornado occurred on June 18th when one weak tornado occurred in Kossuth county in a rural field with no damage. There was a relatively long break in activity from June 19th through all of July until several tornadoes touched down during the August 10th derecho.  3 tornadoes were recorded in Marshall county with another one in Tama county and another in Linn county as the derecho plowed through the state.  Fortunately, no injuries or deaths were observed with the tornado activity in 2020. Iowa tornado statistics for 2020 can be accessed here





2020 Iowa Tornado Listing
Click each date for storm survey or event summaries (for select events)
# Date Time - Local
Counties Start Location EF Rating Path
KMZ File Survey
1. 03/28/2020 1:59pm - 2:15pm Adams/Adair 3.1 mi NE of Carl EF1 7.47 mi 0/0 DMX
2. 03/28/2020 4:26pm - 4:28pm Marshall 3.6 mi SSW of Rhodes EF0 1.30 mi 0/0 DMX
3. 03/28/2020 5:39pm - 5:42pm Black Hawk 1.3 mi SSE of Voorhies EFU 2.32 mi 0/0 DMX
4. 03/28/2020 5:49pm - 5:51pm Black Hawk 3.6 mi ENE of Hudson EF0 2.06 mi 0/0 DMX
5. 03/28/2020 5:55pm - 5:56pm Black Hawk 1.7 mi W of Evansdale EFU 0.32 mi 0/0 DMX
6. 03/28/2020 6:15pm - 6:25pm Buchanan 2.5 mi NW of Jesup EF1 7.38 mi 0/0 DVN
7. 03/28/2020 6:30pm - 6:36pm Fayette 3.0 mi SE of Oelwein EF1 3.93 mi 0/0 ARX
8. 03/28/2020 6:40pm - 6:43pm Fayette 1.4 mi SSE of Maynard EF0 3.60 mi 0/0 ARX
9. 03/28/2020 8:25pm - 8:31pm Dubuque 1.8 mi WSW of Sherrill EF1 3.80 mi 0/0 DVN
10. 05/23/2020 12:30pm - 12:49pm Johnson/Cedar 4.3 mi SE of Solon EF1 7.11 mi 0/0 DVN
11. 05/23/2020 12:57pm-1:13pm Cedar/Jones 3.6 mi SW of Mechanicsville EF1 6.86 mi 0/0 DVN
12. 05/23/2020 1:20pm - 1:23pm Clinton 1.0 mi SE of Lost Nation EF0 1.19 mi 0/0 DVN
13. 05/23/2020 1:53pm - 1:57pm Jackson 0.5 mi S of Maquoketa EF0 1.45 mi 0/0 DVN
14. 05/23/2020 2:24pm - 2:24pm Jackson 1.2 mi NE of Andrew EFU 0.04 mi 0/0 DVN
15. 05/25/2020 6:26pm - 6:29pm Polk 0.7 mi SW of Johnston EF1 1.56 mi 0/0 DMX
16. 05/26/2020 1:18pm - 1:20pm Dallas 0.1 mi NW of Waukee EF0 0.95 mi 0/0 DMX
17. 05/26/2020 1:28pm - 1:31pm Dallas 2.8 mi SE of Dallas Center EFU 1.69 mi 0/0 DMX
18. 05/26/2020 2:04pm - 2:05pm Boone 4.3 mi SE of Berkley EFU 0.60 mi 0/0 DMX
19. 05/26/2020 2:22pm - 2:23pm Boone 2.5 mi SSE of Ogden EFU 0.21 mi 0/0 DMX
20. 05/26/2020 3:38pm - 3:44pm Wright 2.3 mi WSW of Woolstock EF1 5.14 mi 0/0 DMX
21. 05/26/2020 3:53pm - 3:58pm Guthrie 6.3 mi NNW of Casey EFU 2.94 mi 0/0 DMX
22. 05/26/2020 4:16pm - 4:17pm Guthrie 7.9 mi WSW of Guthrie Center EFU 0.66 mi 0/0 DMX
23. 06/18/2020 6:37pm - 6:38pm Kossuth 4.3 WNW German Valley EFU 0.72 mi 0/0 DMX
24. 08/10/2020 11:30am - 11:31am Marshall 2.8 SW La Moille EFU 1.03 mi 0/0 DMX
25. 08/10/2020 11:36am - 11:37am Marshall 0.7 ENE Minerva EFU 0.42 mi 0/0 DMX
26. 08/10/2020 11:39am - 11:42am Marshall 1.4 ENE Marietta EF1 2.88 mi 0/0 DMX
27. 08/10/2020 12:01pm - 12:03pm Tama 4.3 ESE Gladbrook EFU 1.48 mi 0/0 DMX
28. 08/10/2020 12:31pm - 12:32pm Linn 1.9 NNW Cedar Rapids Airport EFU 0.92 mi 0/0 DVN

* Red entries indicate that the information is still under review


Track lengths use polylines created in the NWS Damage Assessment Toolkit when available, which may be longer than the official Storm Data track (derived from start and end points only).