Storm reports for August 31, 2011

IndependentNot affiliated with NOAA or the National Weather Service. Source: NOAA Storm Prediction Center storm reports. Data through November 6, 2026. Methodology

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Other storms on August 31 →

On August 31, 2011, 14 hail, 48 damaging-wind and 0 tornado reports were logged across 6 states. The largest hail reported was 1.75″ (golf ball size) in Slope County, ND.

Storm day runs 7 a.m. to 7 a.m. Eastern (12:00–12:00 UTC), the convention the Storm Prediction Center uses. Radar hail estimates start October 2019.

Storm reports by state

Cities with hail reported within 5 miles

Hail reports (14)

Damage, injuries and deaths

National Weather Service offices recorded about $175,000 in property damage from hail, thunderstorm wind and tornadoes across the US on this storm day (62 events in 6 states). Injuries and deaths are those the events caused directly.

What the National Weather Service wrote

• Morton County, ND (near Sims) · Thunderstorm wind 70 mph · $65,000
  “Straight line wind damage occurred near New Salem. A barn roof was destroyed, an auger was tipped over, and debris was thrown into the side of a home.”
• Williams County, ND (near Williston) · Thunderstorm wind 61 mph · $45,000
  “Tree branches were broken off at the Williston airport and a new hanger was damaged.”
• Santa Cruz County, AZ (near Calabasas) · Thunderstorm wind 60 mph · $20,000
  “Thunderstorms winds downed trees and power poles in Rio Rico along Interstate 19.”
• Geauga County, OH (near Burton) · Thunderstorm wind 58 mph · $10,000
  “Thunderstorm winds downed several trees in the Burton area.”
• Kittson County, MN (near Donaldson) · Thunderstorm wind 121 mph
  “Peak westerly winds to 121 mph were measured at the RWIS site located along highway 11. Damage to downwind fields, farm shelterbelts and the community of Donaldson were commensurate with winds to that extreme.”
• Kittson County, MN (near Donaldson) · Thunderstorm wind 120 mph
  “Two large commercial grade steel bins and their horizontal transfer system were torn out from the city grain elevator facility and were splayed to the east, partially blocking U. S. Highway 75. Several wooden power poles in the area were also snapped.”

Event narratives from NWS Storm Data, shortened. Up to six per day, chosen by deaths, injuries, damage and size.

Source: NOAA National Centers for Environmental Information (NCEI), Storm Events Database, as entered by National Weather Service offices; data through July 31, 2026. Damage is in dollars of the year, not adjusted for inflation.

Guides: What radar-estimated hail (MESH) is and isn't · Storm reports: preliminary vs final