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: 47

EF0 (35)
EF1 (8)
EF2 (2)
EF3 (2)
EF4 (0)
EF5 (0)
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***ALL DATA ON THIS PAGE IS PRELIMINARY AND MAY CHANGE AT ANY TIME***
This page will be updated as time and resources allow and may not contain information from recent events
Information last updated on 07/10/2018

Above is a map of the tornadoes that occurred across Iowa in 2018. 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.


2018 Iowa Tornado Summary  

    A total of 47 tornadoes have occurred across the state of Iowa so far in 2018.  The first tornado of the year did not occur until May 3rd which is around a month later than usual. Four tornadoes occurred on that day with two in southwest Jasper county, one in northern Marion county and the last near Olin in Jones county.  All were weak and short lived with only crop and tree damage noted.  The next tornado occurrence was on Memorial Day when a weak tornado occurred southeast of Plover in Pocahontas county remaining in rural agricultural land.  Another similar tornado spun-up on the next day just northeast of Ames and remained over cropland.  The tornadoes in June occurred mainly on two days, the 9th and 20th.  Three tornadoes touched down on June 9th in northern Iowa with two EF1 tornadoes occurring, one near Forest City and the other southeast of Winthrop.  On the 20th, six tornadoes occurred, mainly in central Iowa with all of the EF0 in strength.   The largest outbreak of the year and also the largest since November 2015 occurred on July 19th when 21 tornadoes touchdown across the state.  The most significant tornadoes were two EF3's.  One passed just northeast of Pella but hit the Vermeer manufacturing plant on the east side of town, producing 13 injuries.  The other EF3 formed northwest of Marshalltown and produced a path of destruction from the northwest side of town, through the middle of the business district, exiting the east side of town over the Lennox plant.  This tornado produced 22 injuries along with damages estimated over $200 million.  A few weak tornadoes occurred in eastern Iowa in the later half of August into early September producing minimal damage.  


 

2018 Iowa Tornado Listing
Click each date for storm survey or event summaries (for select events)
# Date Time - Local
(CDT/CST)
Counties Start Location EF Rating Path
Length
Injuries/
Deaths
Radar
Loop
View Map KMZ File Survey
Office
1. 05/03/2018 7:46pm - 7:47pm Jasper 3.8 mi SSW of Priarie City EF0 0.43 mi 0/0   N/A DMX
2. 05/03/2018 7:48pm - 7:50pm Marion 3.8 mi ENE of Swan EF0 1.07 mi 0/0   N/A DMX
3. 05/03/2018 7:56pm - 7:57pm Jasper 4.7 mi E of Prairie City  EF0 0.39 mi 0/0   N/A DMX
4. 05/03/2018 11:15pm - 11:17pm Jones 0.4 mi NW of Olin EF0 0.10 mi 0/0   N/A DVN
5. 05/28/2018 2:20pm - 2:22pm Pocahontas 2.5 mi ESE of Plover EF0 0.87 mi 0/0   N/A DMX
6. 05/29/2018 3:58pm - 4:01pm Story 3.9 mi ENE of Ames EF0 0.30 mi 0/0   N/A DMX
7. 06/09/2018 3:07pm - 3:13pm Winnebago 2.0 mi S of Leland EF1 2.75 mi 0/0   N/A DMX
8. 06/09/2018 3:36pm - 3:38pm Cerro Gordo 5.3 mi NNW of Clear Lake EF0 1.18 mi 0/0   N/A DMX
9. 06/09/2018 9:36pm - 9:37pm Buchanan 6.0 mi SE of Winthrop EF1 0.10 mi 0/0   N/A DVN
10. 06/11/2018 6:59pm - 7:00pm Fremont Mc Paul EF0 0.10 mi 0/0   N/A   OAX
11. 06/18/2018 5:00pm - 5:02pm Mills 0.7 SSE Pacific Jct EF0 0.25 mi 0/0   N/A   OAX
12. 06/20/2018 2:18pm - 2:29pm Dallas/Boone 0.8 mi E of the Perry Airport EF0 2.78 mi 0/0   N/A DMX
13. 06/20/2018 2:20pm - 2:24pm Greene 1.8 mi NNW of Scranton EF0 0.57 mi 0/0   N/A DMX
14. 06/20/2018 2:31pm - 2:39pm Keokuk 1.0 mi ESE of Delta EF0 6.30 mi 0/0   N/A DVN
15. 06/20/2018 2:43pm - 2:45pm Webster 1.8 ESE Lanyon EF0 0.69 mi 0/0   N/A DMX
16. 06/20/2018 3:27pm - 3:28pm Hardin 3.1 mi SE of Eldora EF0 0.27 mi 0/0   N/A DMX
17. 06/20/2018 5:15pm - 5:17pm Wapello 3.8 mi NNE of Blakesburg EF0 0.51 mi 0/0   N/A DMX
18. 06/25/2018 5:14pm - 5:16pm Ringgold 0.7 SW of Delphos EF0 0.73 mi 0/0   N/A DMX
19. 07/19/2018 2:30pm - 2:37pm Wright 5.5 ESE Eagle Grove EF0 3.50 mi 0/0   N/A DMX
20. 07/19/2018 2:35pm - 2:47pm Wright 3.7 E Woolstock EF0 4.43 mi 0/0   N/A DMX
21. 07/19/2018 2:42pm - 2:45pm Wright 7.0 E Woolstock EF0 1.28 mi 0/0   N/A DMX
22. 07/19/2018 2:48pm - 2:49pm Polk 1.7 ENE Ankeny EF0 0.88 mi 0/0   N/A DMX
23. 07/19/2018 2:50pm - 3:02pm Polk 2.3 NW Bondurant EF2 3.69 mi 0/0   N/A DMX
24. 07/19/2018 2:51pm - 3:00pm Polk 1.7 W Bondurant EF2 2.95 mi 0/0   N/A DMX
25. 07/19/2018 2:52pm - 2:57pm Story 3.1 W Story City EF0 2.07 mi  0/0   N/A DMX
26. 07/19/2018 2:56pm - 3:05pm Hamilton 0.9 NW Blairsburg EF0 2.67 mi 0/0   N/A DMX
27. 07/19/2018 3:18pm - 3:24pm Jasper 5.2 WSW Colfax EF0 2.35 mi 0/0   N/A DMX
28. 07/19/2018 3:22pm - 3:30pm Story 1.0 NE Roland EF0 2.79 mi  0/0   N/A DMX
29. 07/19/2018 3:28pm - 3:34pm Jasper 2.0 SSE Prairie City EF0 2.62 mi 0/0   N/A DMX
30. 07/19/2018 3:35pm - 3:40pm Story 1.4 N Collins EF0 2.48 mi 0/0   N/A DMX
31. 07/19/2018 3:45pm - 3:52pm Jasper/Marion 1.9 ENE Monroe EF1 3.96 mi 0/0   N/A DMX
32. 07/19/2018 3:56pm - 3:58pm Marion 2.6 E Otley EF0 0.99 mi 0/0   N/A DMX
33. 07/19/2018 4:01pm - 4:24pm Marion/Mahaska 2.8 N Pella EF3 9.17 mi 13/0   N/A DMX
34. 07/19/2018 4:11pm - 4:13pm Marshall 1.4 SE Clemons EF0 0.85 mi 0/0   N/A DMX
35. 07/19/2018 4:15pm - 4:18pm Mahaska 6.7 NW Leighton EF0 1.16 mi 0/0   N/A DMX
36. 07/19/2018 4:24pm - 4:47pm Marshall 1.4 W Marietta EF3 8.41 mi 22/0   N/A DMX
37. 07/19/2018 4:50pm - 4:53pm Mahaska 5.0 SSE Oskaloosa EF0 1.24 mi 0/0   N/A DMX
38. 07/19/2018 6:07pm - 6:15pm Van Buren 4.9 N Keosauqua EF1 2.14 mi 0/0   N/A DVN
39. 07/19/2018 6:09pm - 6:11pm Van Buren 1.2 NNE Keosauqua EF1 0.19 mi 0/0   N/A DVN
40. 08/16/2018 6:08pm Jones Oxford Junction EF0 0.10 mi 0/0   N/A   DVN
41. 08/20/2018 3:49pm - 3:51pm Clinton 2 E Delmar EF0 0.50 mi 0/0   N/A   DVN
42. 08/28/2018 7:09pm - 7:14pm Scott/Clinton 4.3 N Donahue EF0 4.10 mi 0/0   N/A   DVN
43. 09/03/2018 4:40pm Benton 4.0 SSW Vinton EF0 0.10 mi 0/0   N/A   DVN
44. 09/03/2018 4:46pm Benton 4.0 SSE Vinton EF0 0.10 mi 0/0   N/A   DVN
45. 09/03/2018 5:29pm - 5:36pm Linn 2 NW Alburnett EF1 2.50 mi 0/0   N/A   DVN
46. 09/03/2018 9:07pm - 9:10pm Linn NW Side Cedar Rapids EF1 1.40 mi 0/0   N/A   DVN
47. 09/04/2018 3:35pm - 3:37pm Kossuth 6.6 WSW Algona EF1 1.22 mi 0/0   N/A   DMX

 


* 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).