Storm reports for August 20, 2017

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 20 →

On August 20, 2017, 13 hail, 9 damaging-wind and 0 tornado reports were logged across 10 states. The largest hail reported was 2.25″ (hen egg size) in Ziebach County, SD.

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 (13)

Damage, injuries and deaths

National Weather Service offices recorded about $27,000 in property damage from hail, thunderstorm wind and tornadoes across the US on this storm day (22 events in 10 states). Injuries and deaths are those the events caused directly.

What the National Weather Service wrote

• Cass County, IA (near Atlantic) · Thunderstorm wind 64 mph · $10,000
  “Public reported three inch tree limbs down and power poles broken.”
• Briscoe County, TX (near Gasoline) · Thunderstorm wind 60 mph · $10,000
  “A Texas Parks and Wildlife Department employee reported thunderstorm wind damage at Valley Schools on State Highway 86 between Turkey and Quitaque. A metal roof was torn off of a building.”
• St. Clair County, MO (near Lowry City) · Thunderstorm wind 60 mph · $5,000
  “A farm building was heavily damaged on Highway A west of Lowry City.”
• Cass County, IA (near Atlantic) · Thunderstorm wind 60 mph · $1,000
  “Public reported several large limbs down and damage to a shed.”
• Duval County, FL (near East Mandarin) · Thunderstorm wind 52 mph · $1,000
  “Power lines were blown down near Hood Landing Road, south of Julington Creek Road. The time of damage was based on radar imagery. The cost of damage was unknown, but it was estimated so the event could be included in Storm Data.”
• Lowndes County, GA (near (Vad)Moody Afb) · Thunderstorm wind 60 mph
  “A wind gust of 60 mph was measured at Moody AFB.”

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