| May 2007 | Flash Flood | Glenwood | $2,500,000 | Rainfall of 3 to 4 inches fell across the Glenwood area which caused Keg Creek to flash flood across parts of town. The flooding prompted emergency management crews to go door-to-door to alert residents about the impending flood, although no mandatory evacuations were required. Flooding along Keg Creek, other small creeks across the county and the West Nishnabotna River caused over 2 million dollars worth of damage to roads and bridges and for debris removal. |
| April 1994 | Hail | Glenwood | $50,000 | no account filed |
| April 1994 | Hail | Glenwood | $50,000 | no account filed |
| June 1994 | Hail | Glenwood | $50,000 | no account filed |
| October 2000 | Tornado (F1) | Glenwood | $40,000 | A tornado touched down around 3 miles south southeast of Glenwood Iowa and tracked to just east of town before lifting. The tornado badly damaged a trailer home 1 mile east of Glenwood, and also blew some power poles onto a railroad track which were then run over by a train knocking power out to residents near Glenwood. A large Vinyl Fence was also destroyed, and part of a roof of another house was damaged. |
| April 2001 | Thunderstorm Wind | Glenwood | $10,000 | Possible damage from a thunderstorm rear flank downdraft from a mini-supercell which eventually spawned tornado touchdowns near Mineola, Treynor and then Crescent, Iowa. This downburst damaged a roof and trees in Glenwood. |
| May 1994 | Hail | Glenwood | $5,000 | Thunderstorms erupted over western Iowa during the evening hours. The weak cold front that passed southeast across the state the previous day had stalled out just to the south of Iowa. Advection of warm unstable air over the frontal surface resulted in the development of thunderstorms. The storms were not severe in most instances. One of them did produce a brief period of hail three-quarter inch in diameter north of Glenwood in Mills County. For the most part, hail was only pea-size from most of the storms. |
| May 2024 | Thunderstorm Wind | Glenwood | - | Law enforcement estimated 60 miles per hour wind gusts in the city of Glenwood. |
| April 2024 | Hail | Glenwood | - | The office received a public report of golf ball sized hail. |
| May 2023 | Hail | Glenwood | - | Public reported 1-inch hail. |
| April 2023 | Hail | Glenwood | - | Public reported 1.25-inch hail. |
| April 2023 | Hail | Glenwood | - | Public reported 1.25-inch hail. |
| April 2023 | Hail | Glenwood | - | Public reported 1-inch hail via mPING. |
| April 2023 | Hail | Glenwood | - | Public reported 2-inch hail. |
| June 2022 | Thunderstorm Wind | Glenwood | - | Public reported power lines down and power out in Glenwood. |
| April 2022 | Hail | Glenwood | - | Broadcast media relayed a report of 1.75 inch hail. |
| June 2017 | Hail | Glenwood | - | A Mills County Sheriff Deputy reported golf ball size hail. |
| March 2017 | Thunderstorm Wind | Glenwood | - | Law enforcement indicated tree damage as well as power lines downed by the wind. |
| August 2015 | Thunderstorm Wind | Glenwood | - | Social media posts from a storm chaser in the area indicated that large street signs had been blown over along highway 34 to the east of Interstate 29. The storm chaser also reported tree damage in the area as well. |
| August 2011 | Heavy Rain | Glenwood | - | Rainfall of 2.79 inches fell from 3 separate waves of hail producing thunderstorms. The hail was pea to quarter-size in Glenwood but reached golf ball-size just northeast of town. |
| August 2011 | Hail | Glenwood | - | Hail up to golf ball-size was reported in and around the Glenwood area. |
| August 2011 | Hail | Glenwood | - | Pea to quarter-size hail was reported by the public in the Glenwood area. The hail was accompanied by wind gusts estimated at 60 mph or stronger. |
| August 2011 | Thunderstorm Wind | Glenwood | - | Pea to quarter-size hail was accompanied by wind gusts estimated at 60 mph or stronger. Trees and large tree limbs were downed in the area and some vehicle and home damage was noted. |
| April 2010 | Thunderstorm Wind | Glenwood | - | Thunderstorm wind gusts estimated at close to 60 mph downed 2 to 3 inch in diameter tree limbs in the area. |
| June 2008 | Thunderstorm Wind | Glenwood | - | Thunderstorm wind gusts estimated at over 60 mph downed several large trees and caused other tree damage in the Glenwood area. The winds were from the same complex of storms that caused extensive damage in the Omaha and Council Bluffs area. |
| August 2007 | Thunderstorm Wind | Glenwood | - | Thunderstorm wind gusts estimated at over 60 mph blew a pickup truck off of Interstate 29. |
| August 2007 | Thunderstorm Wind | Glenwood | - | Thunderstorm winds estimated at over 60 mph blew a semi truck off of Interstate 29 and knocked down tree limbs up to 6 inches in diameter which downed some power lines in town. The strong winds lasted for at least 15 minutes. |
| May 2007 | Tornado (EF0) | Glenwood | - | A tornado tracked south of Glenwood for about 4 miles according to storm spotters that followed it. The tornado remained in open fields, and did little if any apparent damage. |
| May 2007 | Heavy Rain | Glenwood | - | The cooperative observer in Glenwood measured 3.7 inches of rain from 730 pm until a little after midnight cdt. |
| August 2007 | Thunderstorm Wind | Glenwood | - | Thunderstorm winds estimated at over 60 mph downed tree limbs and power lines in town. A window was blown out of the administrative office of the County Sheriff's Office and a 100 foot section of fencing along a ball field was ripped down. |
| August 2007 | Thunderstorm Wind | Glenwood | - | Thunderstorm wind gusts estimated at 70 mph downed a number of trees and branches in Glenwood from around the center of town to the east side of town. Some windows were also blown out of buildings. Downed power lines caused about a third of the town to lose power temporarily. |
| August 2007 | Thunderstorm Wind | Glenwood | - | An amateur radio operator reported damage to shingles northeast of Glenwood. The damage was caused by thunderstorm winds estimated at 60 mph. |
| July 2006 | Thunderstorm Wind | Glenwood | - | Thunderstorm wind gusts estimated at over 60 mph downed a power pole north of Glenwood. |
| July 2005 | Thunderstorm Wind | Glenwood | - | Thunderstorm wind gusts estimated at 60 mph severely damaged a greenhouse and downed small tree branches south and southeast of Glenwood. |
| May 2004 | Thunderstorm Wind | Glenwood | - | Thunderstorm wind gusts estimated at 60 mph broke some large tree limbs northwest of Glenwood. |
| May 2004 | Hail | Glenwood | - | Hail up to 1 inch in diameter was reported in and around the Glenwood area. |
| August 2004 | Thunderstorm Wind | Glenwood | - | Thunderstorm wind gusts estimated at over 60 mph downed power lines knocking power out for at least 200 residents. Some windows were also broken at the police department. |
| July 2003 | Thunderstorm Wind | Glenwood | - | Thunderstorm wind gusts broke some tree limbs as large as 12 inches in diameter in town. |
| April 2002 | Tornado (F0) | Glenwood | - | A storm chaser reported a tornado touchdown southwest of the intersection of highways 275 and 34. The tornado was on the ground for less than 1 minute and was in an open field. It was from the same mini-supercell that produced the tornado touchdown near Thurman several minutes earlier. |
| May 2002 | Thunderstorm Wind | Glenwood | - | Thunderstorm winds of around 60 mph blew a considerable amount of lawn furniture over a fairly large area in town. |
| October 2002 | Thunderstorm Wind | Glenwood | - | Law enforcement reported that thunderstorm winds caused some tree and power line damage in Glenwood. |
| April 2001 | Hail | Glenwood | - | Hail covered the ground. |
| June 2001 | Thunderstorm Wind | Glenwood | - | Thunderstorms mostly south of the region caused wind gusts over 60 mph downing power lines around Glenwood and over much of Mills county. |
| May 2000 | Thunderstorm Wind | Glenwood | - | Thunderstorm wind gusts were estimated at 60 mph west of Glenwood. |
| July 2000 | Hail | Glenwood | - | The hail was accompanied by strong winds which overturned a semitrailer truck towing 2 trailers. |
| June 1998 | Thunderstorm Wind | Glenwood | - | Numerous power lines downed. Two inch diameter tree branches downed. |
| May 2013 | Hail | Glenwood | - | no account filed |
| June 2011 | Hail | Glenwood | - | no account filed |
| August 2011 | Hail | Glenwood | - | no account filed |
| June 2008 | Hail | Glenwood | - | no account filed |
| June 2008 | Hail | Glenwood | - | no account filed |
| March 2007 | Hail | Glenwood | - | no account filed |
| March 2007 | Hail | Glenwood | - | no account filed |
| April 2006 | Hail | Glenwood | - | no account filed |
| April 2006 | Hail | Glenwood | - | no account filed |
| June 2006 | Hail | Glenwood | - | no account filed |
| May 2004 | Hail | Glenwood | - | no account filed |
| April 2003 | Hail | Glenwood | - | no account filed |
| May 2003 | Hail | Glenwood | - | no account filed |
| May 2003 | Hail | Glenwood | - | no account filed |