Scattered Severe Storms Across Plains and Midwest — August 17 — SevereWX

A Slight risk for severe thunderstorms covers much of South Dakota today, where storms could produce damaging winds, large hail, and isolated tornadoes. Multiple Severe Thunderstorm Watches remain in effect across parts of the state and neighboring Nebraska into early Tuesday morning, with storms ongoing. Scattered severe potential has been noted elsewhere from the northern Plains to the Mid-South, but watches remain unlikely outside the Dakotas.

SPC's latest mesoscale discussion highlights a 60% chance of a watch for central South Dakota, where storms are expected to intensify this evening.

Timeline

5:03 PM EDT — Severe Thunderstorm Watch issued for western South Dakota

A Severe Thunderstorm Watch is in effect until 12:00 AM EDT for parts of western South Dakota, including Bennett, Custer, Fall River, Haakon, Jackson, Meade, Mellette, Oglala Lakota, and Pennington counties. Storms in the area could bring damaging winds and large hail. SPC has been monitoring the setup closely.

9:27 PM EDT — SPC highlights severe risk eastern Missouri into western Illinois

SPC issued a mesoscale discussion noting severe potential in portions of eastern Missouri into western Illinois. A watch appears unlikely with only a 20% probability. Activity should remain marginal through early Tuesday morning.

9:32 PM EDT — Severe Thunderstorm Watch issued for north-central Nebraska

A Severe Thunderstorm Watch is in effect until 3:00 AM EDT covering Antelope, Boone, Knox, Madison, and Pierce counties in north-central Nebraska. Expect possible damaging winds and hail from ongoing storms.

9:33 PM EDT — Severe Thunderstorm Watch issued for central Nebraska

A Severe Thunderstorm Watch until 3:00 AM EDT is active for Greeley, Howard, Nance, Sherman, and Valley counties in central Nebraska. Storms may produce severe wind gusts and hail.

9:46 PM EDT — Severe Thunderstorm Watch 587 issued eastern Colorado into western Kansas

SPC notes Severe Thunderstorm Watch 587 is now in effect for eastern Colorado into western Kansas until 3:45 AM EDT. Storms pose a risk of damaging winds and large hail.

10:33 PM EDT — Severe Thunderstorm Watch issued for central Minnesota

A Severe Thunderstorm Watch until 1:00 AM EDT covers Benton, Douglas, Kandiyohi, Meeker, Morrison, Pope, Stearns, and Todd counties in central Minnesota. Severe gusts and hail are possible with these storms.

10:58 PM EDT — Severe Thunderstorm Warning issued for north-central Nebraska

A Severe Thunderstorm Warning is in effect until 11:30 PM EDT for Cherry, Hooker, and Thomas counties in north-central Nebraska. Radar indicates strong storms capable of producing severe hail and damaging winds.

10:58 PM EDT — Severe Thunderstorm Watch issued for north-central South Dakota

A Severe Thunderstorm Watch until 12:00 AM EDT is active for Corson, Dewey, and Stanley counties in north-central South Dakota. Storms could bring damaging winds and large hail.

10:59 PM EDT — Severe Thunderstorm Watch issued for north-central Nebraska

A Severe Thunderstorm Watch until 1:00 AM EDT covers Blaine, Boyd, Brown, Cherry, Custer, Garfield, Holt, Hooker, Keya Paha, and Logan counties in north-central Nebraska. Hail and strong winds remain the main threats.

3:13 AM EDT — SPC notes severe risk southern Indiana into northern Kentucky

SPC issued a discussion for severe potential across southern Indiana into parts of northern Kentucky. A watch is unlikely with 20% probability through late morning.

11:31 AM EDT — SPC highlights severe risk west-central into central Arkansas

A mesoscale discussion from SPC points to severe potential in parts of west-central into central Arkansas, possibly extending into eastern Oklahoma. Watch probability is low at 20%.

1:49 PM EDT — 60% chance of severe watch for southeastern Kentucky into Tennessee Valley

SPC's mesoscale discussion indicates severe potential across parts of southeastern Kentucky, southwestern Virginia, eastern Tennessee, and adjacent areas. A watch is possible with 60% probability through early evening.

3:58 PM EDT — 60% chance of severe watch for much of central South Dakota

SPC highlights severe thunderstorm potential across much of central South Dakota, with a 60% chance of a watch issuance through 6:00 PM EDT. Storms here could intensify rapidly.

11:15 PM EDT — Severe Warning for Brown, Holt, Rock NE

A severe thunderstorm warning is in effect until 12:00 AM EDT for Brown, Holt, and Rock counties in Nebraska. Storms in this area may produce damaging winds and large hail. Take cover if threatening weather nears.

11:20 PM EDT — Severe Warning for Boyd, Holt, Keya Paha, Rock NE

Another severe thunderstorm warning is active until 12:00 AM EDT covering Boyd, Holt, Keya Paha, and Rock counties in Nebraska. Expect possible strong winds and hail from these powerful storms. Stay alert and monitor updates.

How It Ended

All SPC mesoscale discussions expired as severe potential diminished. Severe thunderstorm watch 587 lapsed without further action. Storms weakened rapidly after sunset, closing out the threat window nationwide.