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Additional Rain and Ongoing Flooding in Texas; Snow in the Southern Rockies

The heavy rain in central Texas will shift slightly providing some relief to flood ravaged areas. Flooding and flash flooding will still be possible across portions of Texas. An upper level low will move east from southern California, which will allow California offshore winds to ease reducing fire weather threats. As this system moves east, snow will increase across the Southern Rockies. Read More >

Radar loop of the tornado event. The top left image is base reflectivity and the top right image is storm-relative velocity. The bottom two images are correlation coefficient (CC) and differential reflectivity (ZDR). Low values of CC and ZDR, combined with a velocity couplet, are a strong indicator of debris being lofted by a tornado.
Total Iowa Tornadoes: 58
EF0 (28)
EF1 (26)
EF2 (3)
EF3 (1)
EF4 (0)
EF5 (0)
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Above is a map of the tornadoes that occurred across Iowa in 2015. 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.


2015 Iowa Tornado Summary  

     The 2015 Iowa tornado season was relatively quiet through the climatological peak of activity (May and June), but featured multiple, rare late-season events in October, November, and December. A total of 58 tornadoes were recorded for the year, above average of 48 tornadoes typically seen in a given year. Almost half of these tornadoes occurred in the fall months.

     The season got off to a start on April 9 when a pair of rain-wrapped tornadoes struck far east-central Iowa just north of Davenport. This storm complex would go on to produce deadly tornadoes across northern Illinois that evening. An EF1 tornado scoured a 23.5 mile track across Carroll and Calhoun counties between 7 and 8 pm on May 10, making a direct hit on Lake City, where a number of homes and the school sustained roof damage. This was one of three tornadoes to form that day. The latter part of May was characterized by two somewhat unusual early morning tornado events, one over Madison/Dallas counties on May 17 and another over Jackson County on May 24. The May 17 storm was also responsible for producing a downburst that derailed an 80-car train. The five short-lived tornadoes that occurred afterwards were relatively weak but did damage a few farmsteads. The May 24 tornado hit just prior to 10 am and only damaged some trees.

     Another early morning tornado event took place across central Iowa (Webster, Boone, and Story counties) between 1 and 2 am on June 7. Four very brief tornadoes touched down along the leading edge of a squall line, one of which moved through far southern Ames and caused tree and light building damage. A squall line was also responsible for five EF0/EF1 tornadoes that hit southeast Iowa on the afternoon of June 20. The strongest tornado of the season hit southeast Iowa on June 22. This large EF3 tornado caused extensive damage to a few farmsteads and trees in NW Monroe County. The tornado lifted eight miles northwest of Albia, but a second EF2 tornado developed just to the west of town and hopscotched through the southwest part of the city, heavily damaging several businesses and homes. Iowa saw only two tornadoes in August, one on August 2 and another on August 18. The August 2 EF1 tornado struck the hamlet of Williamson and featured a very erratic track over Adair and Adams counties.

     The barrage of late season tornadoes began on October 23 with seven tornadoes racing across northwest and west central Iowa during the late afternoon and evening hours. While visually striking, thankfully the damage was light and all of the tornadoes were rated EF0. A strong low pressure system lifted across the region on Veteran's Day (November 11) and led to the most prolific November tornado outbreak in Iowa history. A total of 19 tornadoes lashed the southern half of the state with some tracks over 20 miles long. Tornadoes touched down at the Des Moines Airport and the SE side of Knoxville and several other tornadoes reached EF-2 intensity near Lake Rathbun and Barnes City. Finally, December 23 witnessed two tornadoes in the eastern portion of the state near Cedar Rapids and Luxemburg, both of EF1 intensity. These two tornadoes set a record for the number of tornadoes to occur in Iowa in the month of December. Of the 58 tornadoes seen this year, all but four were rated EF0 or EF1. The split between EF0 and EF1 tornadoes was nearly equal (28 and 26 respectively).


2015 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. 04/09/2015 5:04pm - 5:30pm Scott
Clinton
8.0 mi W of Maysville EF1 22.34 mi 0/0 DVN
2. 04/09/2015 5:40pm - 6:00pm Clinton
Whiteside, IL
1.0 mi SE of the Clinton Airport EF1 12.45 mi 0/0 DVN
3. 05/03/2015 5:34pm - 5:36pm Dickinson 2.6 mi ENE of Terril EF0 0.25 mi 0/0 N/A N/A FSD
4. 05/10/2015 3:28pm - 3:30pm Sioux 2.0 mi E of Fairview EF0 0.85 mi 0/0 N/A N/A FSD
5. 05/10/2015 7:10pm - 8:00pm Carroll
Calhoun
3.3 mi NW of Lidderdale EF1 23.50 mi 0/0 DMX
6. 05/10/2015 8:14pm - 8:16pm Calhoun 2.4 mi SW of Manson EF0 1.12 mi 0/0 DMX
7. 05/17/2015 2:20am - 2:31am Madison 3.7 mi SSW of Truro EF0 7.19 mi 0/0 DMX
8. 05/17/2015 2:27am - 2:31am Madison 3.1 mi WNW of East Peru EF0 1.75 mi 0/0 DMX
9. 05/17/2015 2:40am - 2:42am Madison 3.1 mi NNW of Patterson EF1 1.54 mi 0/0 DMX
10. 05/17/2015 2:40am - 2:42am Madison 4.5 mi N of Patterson EF1 1.55 mi 0/0 DMX
11. 05/17/2015 3:00am - 3:01am Dallas 3.0 mi NNW of Van Meter EF0 0.32 mi 0/0 DMX
12. 05/24/2015 5:42pm Lee 2.2 mi SE of St. Paul EF1 0.11 mi 0/0 DVN
13. 05/26/2015 9:59am - 10:00am Jackson 5.8 mi SW of Zwingle EF1 0.14 mi 0/0 DVN
14. 06/07/2015 1:11am - 1:12am Webster 2.4 mi SE of Harcourt EF0 0.73 mi 0/0 DMX
15. 06/07/2015 1:15am - 1:18am Boone 3.2 mi SW of Fraser EF0 2.86 mi 0/0 DMX
16. 06/07/2015 1:18am - 1:20am Boone 3.1 mi ENE of Pilot Mound EF0 1.45 mi 0/0 DMX
17. 06/07/2015 1:41am - 1:43am Story 0.5 mi E of Ames Airport EF1 0.99 mi 0/0 DMX
18. 06/20/2015 6:09pm - 6:14pm Monroe
Wapello
3.0 mi SSW of Eddyville EF1 3.70 mi 0/0 DMX
19. 06/20/2015 7:01pm - 7:08pm Washington 1.8 mi NW of Wayland EF1 1.39 mi 0/0 DVN
20. 06/20/2015 7:18pm - 7:25pm Henry 4.9 mi SE of Mount Pleasant EF1 3.46 mi 2/0 DVN
21. 06/20/2015 7:34pm - 7:38pm Lee 3.1 mi NW of Fort Madison EF1 4.41 mi 0/0 DVN
22. 06/20/2015 7:32pm - 7:36pm Des Moines 1.4 mi SSW of Middletown EF1 2.92 mi 0/0 DVN
23. 06/22/2015 8:21am - 8:23am Fayette 3.3 mi ESE of Maynard EF1 1.53 mi 2/0 ARX
24. 06/22/2015 5:05pm - 5:34pm Marion
Lucas
Monroe
1.7 mi SE of Columbia EF3 11.60 mi 0/0 DMX
25. 06/22/2015 5:50pm - 5:54pm Monroe 1.9 mi WSW of Albia EF2 1.82 mi 0/0 DMX
26. 06/28/2015 4:49pm - 4:50pm Van Buren 0.6 mi SE of Milton EF0 0.01 mi 0/0 N/A N/A DVN
27. 07/16/2015 5:14pm - 5:15pm Henry 2.9 mi E of Trenton EF0 1.51 mi 0/0 DVN
28. 07/16/2015 8:34pm - 8:36pm Mitchell 2.0 mi NNW of Meora EF0 2.07 mi 0/0 ARX
29. 08/02/2015 6:21pm - 6:57pm Adair
Adams
2.6 mi NNW of Willamson EF1 7.54 mi 0/0 DMX
30. 08/18/2015 3:13pm - 3:14pm Cedar 2.8 mi NW of Stanwood EF0 0.05 mi 0/0 DVN
31. 10/23/2015 4:10pm - 4:11pm Plymouth 0.9 mi SW of Hinton EF0 0.15 mi 0/0   FSD
32. 10/23/2015 5:38pm - 5:39pm Sioux 0.7 mi SW of Alton EF0 0.23 mi 0/0   FSD
33. 10/23/2015 5:49pm - 5:50pm Sioux 3.7 mi SW of Hospers EF0 0.15 mi 0/0   FSD
34. 10/23/2015 6:01pm - 6:02pm Sioux 0.9 mi NE of Hospers EF0 0.23 mi 0/0   FSD
35. 10/23/2015 6:21pm - 6:22pm O'Brien 2.4 mi SE of Sheldon EF0 0.17 mi 0/0   FSD
36. 10/23/2015 6:39pm - 6:41pm Cherokee 1.5 mi NNW of Larrabee EF0 0.26 mi 0/0   FSD
37. 10/23/2015 7:18pm - 7:25pm Carroll 4.2 mi W of Halbur EF0 3.52 mi 0/0   DMX
38. 11/11/2015 12:48pm - 12:50pm Page 0.8 mi WSW of Norwich EF0 0.57 mi 0/0   N/A N/A OAX
39. 11/11/2015 1:48pm - 2:02pm Pottowattamie
Shelby
2.4 mi WSW of Avoca EF0 10.21 mi 0/0   OAX
40. 11/11/2015 2:00pm - 2:25pm Taylor
Ringgold
Union
4.0 mi SE of Conway EF1 21.96 mi 0/0   DMX
41. 11/11/2015 2:09pm - 2:20pm Ringgold 1.1 mi SSW of Delphos EF1 12.59 mi 0/0   DMX
42. 11/11/2015 2:31pm - 2:33pm Carroll 3.1 mi ESE of Manning EF0 1.49 mi 0/0   DMX
43. 11/11/2015 2:35pm - 2:48pm Ringgold
Decatur
2.9 mi SSE of Beaconsfield EF1 11.17 mi 0/0   DMX
44. 11/11/2015 2:49pm - 2:58pm Madison 3.6 mi N of Lorimor EF0 5.72 mi 0/0   DMX
45. 11/11/2015 2:51pm - 3:02pm Madison 6.6 mi WSW of Winterset EF1 10.08 mi 0/0   DMX
46. 11/11/2015 2:56pm - 3:00pm Madison 3.6 mi SW of Winterset EF0 2.99 mi 0/0   DMX
47. 11/11/2015 2:57pm - 3:02pm Guthrie 3.9 mi NW of Panora EF0 3.21 mi 0/0   DMX
48. 11/11/2015 2:57pm - 2:58pm Wayne 5.2 mi SE of Allerton EF0 0.60 mi 0/0   DMX
49. 11/11/2015 2:59pm - 3:13pm Dallas 2.7 mi E of Redfield EF1 11.32 mi 0/0   DMX
50. 11/11/2015 3:22pm - 3:38pm Appanoose
Monroe
6.4 mi NNW of Plano EF2 13.12 mi 0/0   DMX
51. 11/11/2015 3:27pm - 3:31pm Polk Des Moines EF0 2.60 mi 0/0   DMX
52. 11/11/2015 3:42pm - 3:47pm Marion Knoxville EF1 4.39 mi 1/0   DMX
53. 11/11/2015 4:15pm - 4:17pm Marshall 3.3 mi ENE of Laurel EF0 1.88 mi 0/0   DMX
54. 11/11/2015 4:16pm - 4:41pm Mahaska
Keokuk
Iowa
2.5 mi E of Rose Hill EF1 24.64 mi 0/0   DMX
DVN
55. 11/11/2015 4:20pm - 4:29pm Mahaska
Poweshiek
5.9 mi SSW of Barnes City EF2 6.73 mi 0/0   DMX
56. 11/11/2015 6:36pm - 6:41pm Scott 3.3 mi W of Le Claire EF1 2.37 mi 0/0   DVN
57. 12/23/2015 4:34pm - 4:38pm Linn Hiawatha EF1 2.25 mi 0/0   DVN
58. 12/23/2015 5:38pm - 5:40pm Dubuque 1.6 mi WNW of Luxemburg EF1 1.10 mi 0/0   DVN