Dakota storm history

Freezing rain overnight and through the morning resulted in ice accumulation of a quarter inch, especially on elevated surfaces, including powerlines. Brief power outages were reported. Snowfall developed later morning and through the afternoon, and accumulated to 3.0 inches at E…

Rainfall amounts across Dakota County from June 20-22 were generally a half inch or less. However, farther north and upstream 6 to 10 plus inches fell across portions of southeast South Dakota and northwest Iowa. Record flood waters along the Vermillion and Big Sioux Rivers empti…

Nebraska Highway 26E Spur was closed due to flooding, with water reaching into portions of Ponca. In addition, flooding resulted in extensive damage to public infrastructure including numerous county and township roads, culverts, and some bridges.

Northwest winds were sustained at times from 40 to 51 mph 1 mile north of Emerson.

Snowfall totaled 3.3 inches near Ponca, 5.1 inches 2 miles west-northwest of Jefferson, and 4.2 inches in Sergeant Bluff.

Synoptic northwest winds were occasionally sustained from 40 to 47 mph at a Nebraska Road Weather Information System site 1 mile north of Emerson.

Snowfall totaled 3.1 inches at Sergeant Bluff and 1.0 inch at Emerson.

A long-duration snowfall totaled 5.0 inches 3 miles southwest of Hubbard. During a brief break in snowfall during the evening of November 28, a period of light freezing rain and freezing drizzle resulted in a few hundredths of an inch ice accumulation.

Sustained winds reached 40 to 46 mph at a Nebraska Road Weather Information System site 1 mile north of Emerson.

Dangerous heat index values peaked as high as 114 degrees at Dakota City on August 16.

Dangerous heat index values peaked as high as 107 degrees near Dakota City.

Dangerous heat index readings reached an afternoon peak on July 27 as high as 117 degrees near Dakota City and 106 degrees in South Sioux City.

Dangerous heat index readings reached afternoon peaks as high as 105 degrees near Dakota City on July 23.

Daily afternoon and evening heat indices ranged from 105 to 112 degrees with a maximum heat index of 112 degrees at a personal weather station near Dakota City and 106 degrees near Sergeant Bluff on June 20.

Sustained easterly winds reached 40 to 43 mph 1 mile north of Emerson.

Snowfall totaled 5.0 inches at Sioux City and 2.0 inches at Emerson. Northwest winds gusted between 35 and 50 mph with a peak gust of 55 mph reported by the ASOS at Sioux Gateway Airport (KSUX). The combination of snow and wind resulted in white-out conditions, especially in rura…

Snowfall totaled 3.5 inches at Emerson and 3.0 inches at the Sioux City Airport. Northwest winds were sustained from 40 to 47 mph at times with a few gusts as high as 62 mph near Ponca and 60 mph in Sergeant Bluff. The combination of snow and wind resulted in widespread white-out…

Northwest winds were sustained from 40 to 47 mph with a peak gust of 62 mph near Ponca and a peak gust of 60 mph in Sergeant Bluff.

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

The lowest wind chills ranged from 30 to 35 below zero with 35 below zero observed at the South Dakota Road Weather Information System site near North Sioux City.

Snowfall totaled 3.0 inches at Emerson.

Severe (D2) drought conditions persisted through the month.

The lowest wind chills ranged from 30 to 35 below zero with 35 below zero observed at the Iowa Department of Transportation site near Sioux City. The Sioux Gateway Airport (KSUX) near Sioux City reported a minimum wind chill of 32 below zero.

Snowfall totaled 3.4 inches at Sergeant Bluff and 3.2 inches 2 miles west-northwest of Ponca. Visibility was as low as one-half mile for a brief time.

Severe (D2) drought conditions persisted through the month.

Winds near Emerson were sustained at times from 40 to 45 mph with gusts over 50 mph.

A brief period with wind gusts as high as 46 mph occurred at South Sioux City.

Severe (D2) drought persisted through December.

Severe (D2) drought persisted through November.

Severe (D2) drought developed with precipitation 5 to 6 inches below normal since August 1.

Afternoon and early evening heat index values near Dakota City reached as high as 112 degrees on August 25 and 106 degrees on August 26.

Two-day heat index values peaked very briefly at 106 degrees at a personal weather station near Dakota City.

Several large tree limbs were downed around South Sioux City, some on top of vehicles or residential structures.

A car was stalled in flood waters along South Ridge Drive near U.S. Highway 77.

Daily afternoon and evening heat indices ranged from 100 to 109 degrees with a maximum heat index of 109 degrees at a personal weather station near Dakota City and 102 degrees at a personal weather station in South Sioux City on July 13. The heat index returned to 108 degrees nea…

The Missouri River near Ponca rose above flood stage the morning of June 24th, cresting around 0.93 feet above flood stage (20.93 feet) on June 26th. The river then fell below flood stage on the morning of June 27th. For a more comprehensive description of flood damage, please se…

The Missouri River at Sioux City rose above flood stage the evening of June 24th, cresting around 2.23 feet above flood stage (32.23 feet) on June 25th. The river then fell below flood stage on the morning of June 27th. For a more comprehensive description of flood damage, please…

Visibility dropped to one-half mile or less for roughly one to two hours due to a combination of wind gusts as high as 43 mph at a personal weather station in South Sioux City and snowfall which was generally around one-half inch at Emerson and Sioux City. Travel conditions were …

Wind chills dropped as low as -30 degrees in South Sioux City.

Snowfall totaled 3.0 inches at Emerson. Visibility was as low as 1/2 mile at times of falling snow and wind gusts to around 25 mph in the late morning and early afternoon hours.

Wind chills remained -35 degrees or colder at times over a nearly four-day period, with a minimum wind chill of -45 degrees at South Sioux City during the early overnight of January 14.

Compounded by earlier snowfall, whiteout and near whiteout conditions developed as northwest winds peaked at 40 mph in South Sioux City during the afternoon of January 13. Conditions resulted in closed roads for numerous hours.