Union storm history

As snow redeveloped and began to accumulate toward evening on January 14, the increase in winds to a sustained 30 to 40 mph with a few gusts as high as 62 mph at South Dakota RWIS site 3 miles south of Beresford and 55 mph near North Sioux City, resulted in widespread near white-…

Rain changed quickly to snowfall late afternoon on March 19, with visibility to around one-half mile at times between 1700-2100CST. The intense snowfall rate made travel hazardous during the late afternoon and early evening as winds increased to a peak of 47 mph 3 miles south of …

Rainfall amounts across Union County from June 20-22 ranged from around a third of an inch across southern areas to 1 to 2 inches across northern areas. Farther north and upstream, 6 to 10 inches of rain fell across portions of southeast South Dakota and northwest Iowa, with loca…

Lightning struck a single-story apartment building and initiated a fire which burned through the entire attic of the building. Crews from North Sioux City and three nearby cities attacked the fire for around two hours. All twenty apartments were severely damaged, displacing all r…

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

Sustained northwest winds reached near 40 mph with a peak gust of 58 mph 4 miles south of Beresford.

Short duration near-blizzard conditions occurred, divided by a longer improvement in conditions as falling snow ended for a time during the afternoon and early evening. Gusty northwest winds from 35 to 55 mph were concurrent with light snowfall, which totaled 1.0 inch near Jeffer…

Northwest winds were sustained between 40 and 48 mph at times, with gusts as high as 64 mph 4 miles south of Beresford.

Wind chills reached as low as -28 degrees 4 miles south of Beresford.

Snowfall totaled 5.1 inches 2 miles west-northwest of Jefferson.

Synoptic northwest winds were sustained from 40 to 46 mph with a peak gust of 61 mph at a South Dakota Road Weather Information System site 3 miles south-southwest of Beresford and 59 mph in North Sioux City.

Snowfall totaled 3.5 inches 2.1 miles west-northwest of Jefferson.

A long-duration snowfall totaled 5.2 inches 2 miles west-northwest of Jefferson and 5.0 inches 10 miles north-northeast of Elk Point. During a brief break in snowfall during the late evening of November 28 and into the early overnight, a period of light freezing rain and freezing…

Sustained winds reached as high as 40 to 42 mph at times at the South Dakota Road Weather Information System sites 4 miles south of Beresford and North Sioux City, with a peak gust of 58 mph in North Sioux City.

Dangerous heat index values peaked as high as 109 degrees at North Sioux City and 101 degrees 4 miles south of Beresford on August 16.

Dangerous heat index values peaked as high as 111 degrees in North Sioux City.

Thunderstorm wind gusts were measured by a Road Weather Information System sensor near Beresford.

Thunderstorm wind gusts were measured by a Road Weather Information System sensor near North Sioux City.

Thunderstorm wind gusts were measured by a personal weather station.

Thunderstorm wind gusts were measured by a Road Weather Information System sensor in North Sioux City.

Significant tree and powerline damage from an extended period of thunderstorm winds throughout Beresford. Several business signs were damaged.

Thunderstorm winds caused significant tree and powerline damage throughout Alcester.

Thunderstorm wind gusts were measured by a personal weather station.

An extended period of damaging thunderstorm wind gusts was measured by a Road Weather Information System sensor south of Beresford. The first severe gusts were measured at 1954 CST with a peak of 75 mph at 2007 CST.

Dangerous heat index readings reached an afternoon peak on July 27 as high as 113 degrees at North Sioux City and 107 degrees 4 miles south of Beresford.

Multiple roadways and intersections were inundated by water deep enough to impede travel.

Dangerous heat index readings reached afternoon peaks as high as 115 degrees near Dakota Dunes on July 23.

Two large branches were broken out of a healthy tree.

Thunderstorm winds damaged trees around Elk Point, which led to sporadic power outages.

Daily afternoon and evening heat indices ranged from 105 to 116 degrees with a maximum heat index of 116 degrees at a personal weather station near Jefferson on June 20, 109 degrees at a Road Weather Information System site in North Sioux City on June 20, and 107 degrees at the R…

Ping pong to golf ball size hail occurred between mile markers 19 and 22 on Interstate 29. A semi truck ran into another semi truck in the adjoining lane and forced it off the road due to poor visibility during hail, wind, and heavy rain.

Periodic quarter to ping pong ball size hail occurred around Elk Point for a few minutes. Hail of varying size accumulated to several inches.

Large trees were blown down across Burbank Road.

Thunderstorm winds caused tree and structural damage to an agricultural-themed event venue. The fence at the property was also blown over. Large grain bins were also dented inward approximately 1 mile to the southeast of this property on Burbank Road.

A machine shed was destroyed with debris blown across Burbank road. A few large limbs were broken off trees. A few grain bins were dented by the wind.

Sustained easterly winds reached from 30 to 40 mph and briefly gusted as high as 72 mph 4 miles east of Alcester, 63 mph 8 miles south-southeast of Alcester, 62 mph 7 miles southeast of Alcester, and 58 mph 8 miles north of Elk Point.

Sustained easterly winds reached 40 to 45 mph with gusts as high as 59 mph 3 miles south-southwest of Beresford.

Snowfall only totaled 2.0 inches 10 miles north-northeast of Elk Point, and northwest winds were sustained at times from 40 to 42 mph and gusted as high as 60 mph 4 miles south of Beresford. The combination of snow and wind resulted in periodic white-out conditions, especially in…

Northwest winds were sustained from 40 to 42 mph at times, with gusts as high as 60 mph near Beresford.

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

Winds were sustained at 30 to 39 mph with a peak gust of 55 mph near Beresford and 50 mph in North Sioux City.

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 Beresford.

The lowest wind chills were around 35 below zero with 35 below zero observed at the South Dakota Road Weather Information System site near Beresford.

Snowfall totaled 2.3 inches 4 miles south-southeast of North Sioux City.