Bon Homme storm history

Rainfall amounts across Bon Homme County from June 20-22 ranged from 2 to 3 inches with an estimated 5 to 6 inches across the far northern portion of the county. Overland flooding ensued with additional major flooding along the James River. One home experienced a partial basement…

Flooding resulted in extensive damage to public infrastructure including numerous county and township roads, culverts, and some bridges.

Northwest winds were sustained between 40 and 45 mph at times, with gusts as high as 70 mph 5 miles east-southeast of Tyndall and 59 mph at a South Dakota Mesonet site 3 miles east of Avon.

Snowfall totaled 3.0 inches at Tyndall and 8 miles west-northwest of Springfield.

Wind chills reached as low as -27 degrees near Scotland and -26 degrees 5 miles east-southeast of Tyndall.

Synoptic northwest winds were sustained from 40 to 42 mph with a peak gust of 58 mph at a South Dakota Mesonet site 3 miles east of Avon and 58 mph at a personal weather station 2 miles south of Scotland.

Snowfall totaled 2.8 inches at Tyndall.

A long-duration snowfall totaled 4.6 inches at Tyndall.

Sustained winds reached around 40 mph at times at a South Dakota Road Weather Information System site 5 miles east-southeast of Tyndall.

Dangerous heat index values peaked as high as 105 degrees 5 miles east-southeast of Tyndall on August 16.

Dissipating showers led to the development of locally enhanced non-thunderstorm wind gusts up to 61 mph at a site 5 miles east-southeast of Tyndall.

Dangerous heat index values peaked as high as 109 degrees 4 miles south of Scotland and 101 degrees 5 miles east-southeast of Tyndall.

Thunderstorm wind gusts were measured by a personal weather station.

Thunderstorm wind gusts were measured by a personal weather station.

Thunderstorm wind gusts were measured by a personal weather station.

Thunderstorm wind gusts were measured by a personal weather station.

Dangerous heat index readings reached an afternoon peak as high as 109 degrees near Tyndall on July 27.

Dangerous heat index readings reached daily afternoon peaks as high as 109 degrees 6 miles south of Scotland on July 22.

Several tree limbs were downed by thunderstorm winds.

Daily afternoon and evening heat indices ranged from 105 to 117 degrees with a maximum heat index of 117 degrees a personal weather station near Scotland on June 21, 107 degrees at the Road Weather Information System site near Tyndall on June 21, and 107 degrees at the South Dako…

Although some hail was as big as a golf ball, most stones were dime to quarter size.

Thunderstorm wind gust measured by a personal weather station.

Severe (D2) drought conditions improved to moderate (D1) by late month.

Hail was up to quarter to half-dollar size at times.

Severe (D2) drought conditions persisted through the month.

Snowfall totaled 5.0 inches 7.6 miles west-northwest of Springfield and 3.5 inches at Tyndall.

Sustained winds were occasionally as high as 40 mph 3 miles south of Scotland and 5 miles west of Tyndall.

Severe (D2) drought conditions persisted through the month.

Winds were sustained at 30 to 34 mph with a peak gust of 46 mph near Tyndall.

The lowest wind chills ranged from 35 to 41 below zero with 41 below zero observed at the South Dakota Road Weather Information System site near Tyndall.

Snowfall totaled 2.0 inches at Tyndall and 7.6 miles west-northwest of Springfield.

Severe (D2) drought conditions persisted through the month.

The lowest wind chills ranged from 35 to 36 below zero with 36 below zero observed at the South Dakota Road Weather Information System site near Tyndall.

Severe (D2) drought conditions persisted through the month.

Winds were sustained from 40 to 42 mph at times 5 miles south of Avon.

Winds were occasionally sustained around 30 mph near Tyndall.

Winds were sustained from 30 to 33 mph with gusts as high as 54 mph near Tyndall.

Severe (D2) drought persisted through December.

Winds occasionally gusted as high as 53 mph near Avon and Tyndall.

Severe (D2) drought worsened briefly mid-month to extreme (D3) drought with an early month dry period, then improved back to severe (D2) conditions after more than normal monthly rain occurred in a single day.

Severe (D2) drought developed with precipitation almost 6 inches below normal since August 1.

Afternoon and early evening heat index values reached as high as 117 degrees near Scotland and 108 degrees near Tyndall.

Two-day heat index readings peaked very briefly at 106 degrees at a personal weather station near Scotland.

Several brief funnel clouds were recorded on video northwest of Scotland.

Heat index values reached 102 degrees near Tyndall.