The severe wind outbreak of June 20, 2015

333 wind reportsVirginia, Maryland, Iowa and 17 more states

333 damaging wind reports across 20 states between 1:05 AM and 12:30 AM the next day CDT, 20 of them 65 knots (75 mph) or stronger; the strongest measured gust was 85 mph in Lyman County, SD. 114 hail reports and 11 tornadoes the same day.

Watch the day unfold

Severe wind day · June 20, 2015

How the day unfolded

Every damaging wind report of the day at its logged time, with the day's hail reports and tornadoes, and the counties they reached.

About this replay

Central time—Historical replay — logged report times

Wind reports—of 333 that day

Strongest gust—measured, so far

Largest hail—so far

The day’s milestones

Wind reportsLarger and brighter with speed; filled when measured, a ring when estimated

Hail and tornadoesHail reports as diamonds; the day's tornado paths in green

Counties reportingLit at their first report, brighter with a 65-knot gust or 2-inch hail

Source: NOAA Storm Prediction Center severe weather database (wind, hail and tornado reports with their logged times and places). Each report is a damage or measurement report, not a separate storm; several can describe one gust front. Tornado paths are drawn at a typical forward speed of 35 mph. Times are Central Daylight Time.

The day in numbers

Wind reports: 333; on Saturday, June 20, 2015
75 mph or more: 20; 7 of 86 mph (75 knots) or more
Strongest measured gust: 85 mph; 74 knots, Lyman County, SD
Measured: 15; reports with an instrument reading; the rest are estimates from damage
Killed by wind: 2; 0 injured
Counties reporting: 165; in 20 states

Hour by hour

Damaging wind reports in each hour, Central Daylight Time.

The strongest winds

The 100 strongest reports with a speed. Measured gusts come from an instrument; estimated speeds are judged from damage.

Strongest wind reports, June 20, 2015

1:15 AM	Lyman County SD	100 mph	87	Estimated	0
1:15 AM	Buffalo County SD	100 mph	87	Estimated	1
1:45 AM	Buffalo County SD	100 mph	87	Estimated	0
6:10 PM	Wapello County IA	92 mph	80	Estimated	0
1:05 AM	Lyman County SD	90 mph	78	Estimated	0
6:15 PM	Wapello County IA	86 mph	75	Estimated	0
7:30 PM	Davis County IA	86 mph	75	Estimated	0
1:25 AM	Lyman County SD	85 mph	74	Measured	0
1:05 AM	Lyman County SD	81 mph	70	Estimated	0
1:36 AM	Lyman County SD	81 mph	70	Estimated	0
6:39 PM	Wapello County IA	81 mph	70	Estimated	0
7:14 PM	Lee County IA	81 mph	70	Estimated	0
7:38 PM	Des Moines County IA	81 mph	70	Estimated	0
7:45 PM	Des Moines County IA	81 mph	70	Estimated	0
7:55 PM	Scotland County MO	81 mph	70	Estimated	0
6:39 PM	Wapello County IA	75 mph	65	Estimated	0
6:40 PM	Wapello County IA	75 mph	65	Estimated	0
7:17 PM	Henry County IA	75 mph	65	Estimated	0
11:58 PM	Warren County IN	75 mph	65	Estimated	0
12:00 AM	Warren County IN	75 mph	65	Estimated	0
1:15 AM	Tripp County SD	72 mph	63	Measured	0
1:30 AM	Brule County SD	70 mph	61	Estimated	0
1:45 AM	Buffalo County SD	70 mph	61	Estimated	0
2:25 AM	Douglas County SD	70 mph	61	Estimated	0
7:20 PM	Davis County IA	70 mph	61	Estimated	0
7:26 PM	Des Moines County IA	70 mph	61	Estimated	0
7:51 PM	Des Moines County IA	70 mph	61	Estimated	0
8:02 PM	Des Moines County IA	70 mph	61	Estimated	0
8:12 PM	McDonough County IL	70 mph	61	Estimated	0
8:31 PM	Sheridan County NE	70 mph	61	Estimated	0
8:34 PM	McHenry County ND	70 mph	61	Estimated	0
8:52 PM	Sheridan County NE	70 mph	61	Estimated	0
9:10 PM	Meade County SD	70 mph	61	Estimated	0
9:12 PM	Adair County MO	70 mph	61	Estimated	0
2:16 AM	Brown County NE	69 mph	60	Measured	0
6:42 PM	Wapello County IA	69 mph	60	Estimated	0
1:10 AM	Tripp County SD	64 mph	56	Measured	0
4:31 PM	Caswell County NC	64 mph	56	Measured	0
7:19 PM	Richmond County VA	64 mph	56	Measured	0
3:00 AM	Lake County SD	64 mph	56	Estimated	0
3:10 AM	Minnehaha County SD	64 mph	56	Estimated	0
3:40 AM	Rock County MN	64 mph	56	Estimated	0
3:40 AM	Lincoln County MN	64 mph	56	Estimated	0
3:45 AM	Rock County MN	64 mph	56	Estimated	0
4:35 AM	Brown County MN	64 mph	56	Estimated	0
4:45 AM	Brown County MN	64 mph	56	Estimated	0
4:50 AM	Brown County MN	64 mph	56	Estimated	0
10:30 AM	Buchanan County IA	64 mph	56	Estimated	0
4:35 PM	Stephenson County IL	64 mph	56	Estimated	0
7:32 PM	Lee County IA	64 mph	56	Estimated	0
7:39 PM	Des Moines County IA	64 mph	56	Estimated	0
7:45 PM	Hancock County IL	64 mph	56	Estimated	0
7:52 PM	Putnam County MO	64 mph	56	Estimated	0
11:50 PM	Sussex County DE	63 mph	55	Measured	0
12:00 PM	Sarasota County FL	63 mph	55	Estimated	0
3:57 PM	Cabarrus County NC	63 mph	55	Estimated	0
4:30 PM	Buckingham County VA	63 mph	55	Estimated	0
4:55 PM	Pittsylvania County VA	63 mph	55	Estimated	0
5:17 PM	Saluda County SC	63 mph	55	Estimated	0
5:22 PM	Saluda County SC	63 mph	55	Estimated	0
5:27 PM	Halifax County VA	63 mph	55	Estimated	0
5:27 PM	Halifax County VA	63 mph	55	Estimated	0
5:31 PM	Lexington County SC	63 mph	55	Estimated	0
5:45 PM	Charlotte County VA	63 mph	55	Estimated	0
6:17 PM	Buckingham County VA	63 mph	55	Estimated	0
7:26 PM	Prince William County VA	62 mph	54	Measured	0
1:30 AM	Brule County SD	60 mph	52	Measured	0
2:15 AM	Cherry County NE	60 mph	52	Measured	0
6:33 PM	Wapello County IA	60 mph	52	Measured	0
6:55 PM	Jefferson County IA	60 mph	52	Measured	0
12:15 AM	Tippecanoe County IN	60 mph	52	Measured	0
1:49 AM	Gregory County SD	60 mph	52	Estimated	0
1:49 AM	Charles Mix County SD	60 mph	52	Estimated	0
1:52 AM	Charles Mix County SD	60 mph	52	Estimated	0
1:59 AM	Jerauld County SD	60 mph	52	Estimated	0
2:45 AM	Knox County NE	60 mph	52	Estimated	0
2:50 AM	Knox County NE	60 mph	52	Estimated	0
3:45 AM	Lyon County MN	60 mph	52	Estimated	0
3:50 AM	Rock County MN	60 mph	52	Estimated	0
3:50 AM	Murray County MN	60 mph	52	Estimated	0
4:10 AM	Nobles County MN	60 mph	52	Estimated	0
1:25 PM	Lewis County WV	60 mph	52	Estimated	0
3:15 PM	Anne Arundel County MD	60 mph	52	Estimated	0
3:22 PM	Jo Daviess County IL	60 mph	52	Estimated	0
3:30 PM	Hampshire County WV	60 mph	52	Estimated	0
3:58 PM	Mineral County WV	60 mph	52	Estimated	0
4:27 PM	Hardy County WV	60 mph	52	Estimated	0
4:34 PM	Hampshire County WV	60 mph	52	Estimated	0
4:50 PM	Albemarle County VA	60 mph	52	Estimated	0
5:13 PM	Albemarle County VA	60 mph	52	Estimated	0
5:20 PM	Madison County VA	60 mph	52	Estimated	0
5:23 PM	Loudoun County VA	60 mph	52	Estimated	0
5:26 PM	Ziebach County SD	60 mph	52	Estimated	0
5:35 PM	Fairfax County VA	60 mph	52	Estimated	0
6:18 PM	Loudoun County VA	60 mph	52	Estimated	0
6:20 PM	Arlington County VA	60 mph	52	Estimated	0
6:28 PM	Prince William County VA	60 mph	52	Estimated	0
6:28 PM	Prince William County VA	60 mph	52	Estimated	0
6:28 PM	Wapello County IA	60 mph	52	Estimated	0
6:28 PM	Prince William County VA	60 mph	52	Estimated	0

By state

Severe weather reports by state, June 20, 2015

Virginia	101	64 mph	2	1.25
Maryland	39	58 mph	0	—
Iowa	31	60 mph	27	4.00
Illinois	28	—	4	0.88
North Carolina	28	64 mph	2	1.00
South Dakota	25	85 mph	16	2.50
West Virginia	19	—	0	—
Pennsylvania	17	—	0	—
Minnesota	10	—	1	0.88
Nebraska	9	69 mph	18	1.75
South Carolina	6	—	0	—
Indiana	5	60 mph	1	0.88
Missouri	4	—	8	1.75
Delaware	3	63 mph	0	—
North Dakota	2	—	27	2.00
Ohio	2	—	0	—
Florida	1	—	2	1.00
District of Columbia	1	—	0	—
Georgia	1	—	0	—
Texas	1	—	0	—
Wyoming	0	—	5	2.50
Wisconsin	0	—	1	1.00

Counties with the most wind reports

Wapello CountyIA · 10 reports
Des Moines CountyIA · 8 reports
Prince William CountyVA · 7 reports
Howard CountyMD · 6 reports
Goochland CountyVA · 6 reports
Harford CountyMD · 5 reports
Knox CountyIL · 5 reports
Richmond CountyVA · 5 reports
Lyman CountySD · 5 reports
Baltimore CountyMD · 5 reports

Hail and tornadoes that day

114 hail reports, 8 of 2 inches or more; 11 tornadoes.

Largest hail, June 20, 2015

5:26 PM	Marion County IA	4.00
5:20 PM	Marion County IA	3.00
5:25 PM	Marion County IA	2.50
6:45 PM	Weston County WY	2.50
7:58 PM	Fall River County SD	2.50
5:38 PM	Benson County ND	2.00
5:50 PM	Mahaska County IA	2.00
10:00 PM	Wells County ND	2.00
4:48 PM	Marion County IA	1.75
5:55 PM	Mahaska County IA	1.75
5:59 PM	Griggs County ND	1.75
6:13 PM	Barnes County ND	1.75
6:38 PM	Wapello County IA	1.75
6:42 PM	Weston County WY	1.75
6:55 PM	Meade County SD	1.75
7:29 PM	Fall River County SD	1.75
8:31 PM	Sheridan County NE	1.75
8:34 PM	McHenry County ND	1.75
8:52 PM	Sheridan County NE	1.75
8:55 PM	Sheridan County NE	1.75
9:00 PM	Sheridan County NE	1.75
9:26 PM	Sheridan County NE	1.75
9:35 PM	Sheridan County NE	1.75
9:35 PM	Sheridan County NE	1.75
11:00 PM	Hooker County NE	1.75
11:30 PM	Adair County MO	1.75
12:45 AM	Pennington County SD	1.75
5:18 PM	Ramsey County ND	1.50
5:20 PM	Ramsey County ND	1.50
5:53 PM	Ziebach County SD	1.50
5:53 PM	Griggs County ND	1.50
7:55 PM	Richland County ND	1.50
9:12 PM	Sheridan County NE	1.50
11:20 AM	Linn County IA	1.25
3:21 PM	Pierce County ND	1.25
4:51 PM	Fluvanna County VA	1.25
6:03 PM	Barnes County ND	1.25
6:41 PM	Wapello County IA	1.25
7:11 PM	Pennington County SD	1.25
8:05 PM	Putnam County MO	1.25
8:45 PM	—	1.25
11:15 AM	Linn County IA	1.00
11:18 AM	Linn County IA	1.00
11:23 AM	Linn County IA	1.00
11:25 AM	Linn County IA	1.00
11:30 AM	Linn County IA	1.00
1:35 PM	Cedar County IA	1.00
1:38 PM	Cedar County IA	1.00
1:45 PM	Clinton County IA	1.00
1:53 PM	Clinton County IA	1.00

EF0 tornado1:12 PM CDT
EF0 tornado4:10 PM CDT
EF1 tornado6:09 PM CDT
EF0 tornado6:27 PM CDT
EF0 tornado6:39 PM CDT
EF1 tornado7:01 PM CDT
EF0 tornado7:02 PM CDT
EF0 tornado7:12 PM CDT
EF1 tornado7:18 PM CDT
EF1 tornado7:32 PM CDT
EF1 tornado7:34 PM CDT

2015 · On this date in other years · The biggest severe wind days

A report is a single damage or measurement report to the National Weather Service. Several reports can describe one gust front, so reports are not storms.
Reporting has grown with population, spotter networks and the internet, so counts from different decades are not directly comparable.
Thunderstorm wind reports start at 50 knots (58 mph). SPC began flagging measured against estimated speeds in 2006; earlier reports are shown as estimated.

Storm Prediction Center severe weather database, 1955 to 2025. A day is SPC’s calendar date in Central Standard Time; a severe wind day here has 300 or more damaging wind reports, or 15 or more of 75 knots (86 mph) or more.