Damaging Winds in South Dakota, July 18, 2017

Name: Damaging Winds in South Dakota, July 18, 2017
Start: 2017-07-18T00:24
End: 2017-07-18T05:10
Location: South Dakota

July 18, 2017 · NWS ABR · 6 events in 5 counties and zones

Severe thunderstorms developed along a surface frontal boundary extending from west to east along the North Dakota/South Dakota border. Severe wind gusts from 60 to nearly 70 mph occurred with these thunderstorms.

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 6

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS ABR wrote it up.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Aberdeen, SD wrote its last area forecast discussion before the first event at Jul 17, 4:40 PM MST, 7 hours 44 minutes earlier.

Area forecast discussion, Jul 17, 4:40 PM MST, 7 hours 44 minutes before

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Hazardous weather outlook, Jul 17, 1:37 AM MST, 22 hours 47 minutes before

Hazardous Weather Outlook
National Weather Service Aberdeen SD
337 AM CDT Mon Jul 17 2017

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-180845-
Traverse-Big Stone-Corson-Campbell-McPherson-Brown-Marshall-
Roberts-Walworth-Edmunds-Day-Dewey-Potter-Faulk-Spink-Clark-
Codington-Grant-Hamlin-Deuel-Stanley-Sully-Hughes-Hyde-Hand-Jones-
Lyman-Buffalo-
337 AM CDT Mon Jul 17 2017 /237 AM MDT Mon Jul 17 2017/

This Hazardous Weather Outlook is for portions of west central
Minnesota, central South Dakota, north central South Dakota, and
northeast South Dakota.

.DAY ONE...Today and Tonight

Hot air across the area will allow for temperatures to top out in
the upper 90s to over 100 degrees. There is also a touch of
humidity to the air and heat index values may also top 100
degrees for an hour or two this afternoon.

We will also see breezy conditions, mainly east of the Missouri
river. Wind gusts between 20 and 30mph, when combined with the hot
temperatures and drought conditions will also result in High to
Very High grassland fire danger today.

Additionally, A front moving across the area will generate
thunderstorms capable of producing strong winds and large hail.
The threat will be focused mainly across eastern and central South
Dakota today, moving east this evening and during the early
overnight hours.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

An active weather pattern is expected for the area through most of
the work week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be requested late this afternoon and
through the evening.

Connelly

The radar

The Bismarck radar (KBIS), 131 km away, was scanning. The volume nearest the first event began at 07:22 UTC.

Open the radar archive at this moment

Event by event

6 thunderstorm wind. Local standard time, as filed.

Thunderstorm Wind, Corson

When: July 18, 12:24 AM MST
Where: Corson County, 11.1 mi S of Bullhead
Measured: 58 kt (67 mph) measured gust
Reported by: Mesonet
Coordinates: 45.610, -101.060

Thunderstorm Wind, Campbell

When: July 18, 2:10 AM CST
Where: Campbell County, 0.48 mi W of Pollock
Measured: 52 kt (60 mph) estimated gust
Reported by: COOP Observer
Coordinates: 45.900, -100.290

Some tree limbs were downed by estimated sixty mph winds.

Thunderstorm Wind, Walworth

When: July 18, 2:19 AM CST
Where: Walworth County, 0.48 mi W of (Y26)mobridge Arpt
Measured: 56 kt (64 mph) measured gust
Reported by: ASOS
Coordinates: 45.550, -100.410

Thunderstorm Wind, Campbell

When: July 18, 2:57 AM CST
Where: Campbell County, 9 mi SSE of Artas
Measured: 52 kt (60 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 45.770, -99.720

Sixty mph winds were estimated.

Thunderstorm Wind, Brown

When: July 18, 4:30 AM CST
Where: Brown County, 3.49 mi S of Richmond
Measured: 51 kt (59 mph) measured gust
Reported by: Mesonet
Coordinates: 45.470, -98.620

Thunderstorm Wind, Edmunds

When: July 18, 5:10 AM CST
Where: Edmunds County, 6.02 mi NE of Ipswich Taylor Arpt
Measured: 52 kt (60 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 45.510, -98.930

Sixty mph winds were estimated.

What these are

Thunderstorm Wind: Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in South Dakota in 2017 Every state in 2017 This day in weather history Warnings in South Dakota, July 2017

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-30. Each event’s entry at NCEI: 715389, 715390, 715391, 715392, 715393, 715394.