| August 2021 | Thunderstorm Wind | Rockford | 1 killed, 2 hurt | A tree fell onto a mobile home in the Riverview Mobile Home Park. Three occupants were rescued. One of the rescued, a 55 year old woman, died from her injuries. |
| July 2024 | Flash Flood | Rockford | 1 killed, 1 hurt | Around 2115 CST, a pickup truck with two people inside attempted to drive through moving flood waters in a parking lot due to flash flooding of Keith Creek near Charles Street and 22nd Street. The pickup truck was swept away by the flood waters. The driver was able to escape but was swept underneath a culvert at 22nd Street before being rescued. A 76 year old passenger became trapped in the pickup truck and drowned. |
| November 1988 | Thunderstorm Wind | not stated | 1 killed | no account filed |
| November 2010 | Tornado (EF2) | Rock Cut State Park | 6 hurt, $500,000 | Based on an eyewitness report, a tornado touched down in the backyard of a home just west of Interstate 39, on the eastern edge of a subdivision. The tornado then blew over a school bus near the intersection of Argyle and Harlem Roads. There were six people on the bus, the driver and five children. All six people were taken to the hospital but none of the injuries were serious. The tornado then knocked down eleven electrical high tension towers just southwest of the same intersection. The tornado was likely at EF2 intensity at this time and as it crossed into Boone County. |
| May 2011 | Thunderstorm Wind | (Rfd)Gtr Rockford Ar | 1 hurt, $50,000 | Several high wind and wind damage reports were received across eastern and southeastern Rockford as a line of severe storms moves through. Specific reports include estimated 70 mph gusts near Alpine Road and Harrison Avenue and estimated 75 mph gusts near Interstate 90 and Highway 20. One person was injured on Crosby Street on the near east side of Rockford when a tree fell onto a house. A large tree fell onto a car on Antelope Drive and destroyed the car. Another tree fell onto a car on Fairview Avenue. A pharmacy on Main street lost part of its roof and part of a wall was damaged. Tree limbs and power lines were blown down in many areas. |
| July 2023 | Lightning | Winnebago | 1 hurt | A man was injured when he was struck by lightning while visiting a Rockford cemetery. His condition was reported as unknown, but the man was responsive when paramedics arrived on scene. |
| September 2010 | Thunderstorm Wind | Loves Park | 1 hurt | A man was struck and injured by a falling tree while exercising in his back yard. |
| September 2006 | Flash Flood | Rockford | $20,000,000 | Thunderstorms developed over southeast Winnebago County and eastern parts of the City of Rockford during the afternoon and evening of September 4th. The thunderstorms continued to redevelop over the same areas, as they pushed north and weakened. Some areas across parts of eastern Rockford received heavy rain for two to three hours. As a result, massive and severe flooding occured. Most of the flooding occurred in and around the Keith Creek Watershed. Some of the damage included a large section of a concrete drainage ditch that was washed out on Harrison Avenue near 20th Street. Hundreds of basements were flooded. Fifteen of these basements suffered structural damage and were deemed uninhabitable. Numerous streets and parking lots were flooded, some as much as 4 to 6 feet with cars floating or submerged in the flood waters. Flood waters as deep as nine feet were reported on Alpine Park in downtown Rockford. Dozens of people were rescued from the flood waters and hundreds were evacuated from their homes as flood waters rose. Flood waters rose so fast in some areas that motorists were trapped in their cars until help arrived. At least 70 businesses sustained some level of flood damage. The highest rainfall total reported was 7.50 inches near Cherry Valley, 4.30 inches was reported on the east side of Rockford, while only 0.72 inches was recorded at Rockford Airport on the southwest side of the City. No fatalities or injuries were reported. |
| June 2008 | Flood | Roscoe | $6,000,000 | no account filed |
| July 2003 | Thunderstorm Wind | Pecatonica | $5,000,000 | no account filed |
| July 2024 | Flash Flood | Woodcrest | $2,000,000 | Thunderstorms producing torrential rainfall moved across southern Winnebago County and Rockford during the late evening of July 13th into the early morning of July 14th producing significant flash flooding and numerous water rescues, though no injuries were reported.||Water rescues were reported near Eastmoreland Avenue and Broadway; Near Auburn Street and Huffman Boulevard; Broadway at Woodruff Avenue; Near Charles Street and 22nd Street; Green Dale Drive and Ashbrook Drive; Spring Creek Road and North 2nd Street; Riverside Boulevard and Latham Street; Near Chelsea Avenue and Arden Court; Near State Street and Trainer Road; At Don Carter Lanes on Street State; Auburn Street and Central Avenue; In the 3400 block of Garfield Drive; Sandy Hollow Road and Alpine Road and several water rescues were reported on the 600 block of St. Louis Avenue. Multiple vehicles were stuck in flood waters along Charles Street including an ambulance. A car was submerged in a parking lot near Charles Street.||Numerous streets were flooded and impassible. Kishwaukee Street was flooded and impassable at 23rd Avenue. A photo showed flowing water over Charles Street at Perryville Road; Video showed several inches of water on State Street just west of Rockford Avenue and a drainage ditch was overflowing near Harrison Avenue and Alpine Road.||Houses were flooded near Javelin Drive and Woodridge Drive. Pavement damage was reported to a nearby parking lot. Water was reported entering a few structures near downtown Rockford including along Benton and State Streets. Numerous homes were surrounded by flood waters along Northwest Drainage Ditch in northwest Rockford where water rescues were done by boat. Flood waters were up to the doorway of houses in the 1000 block of 14th Street where residents were being evacuated. Multiple houses were surrounded by water due to flooding of Keith Creek between 11th Street and 18th Street and a house was flooded near Whitman Street and Rockton Avenue. Several hundred basements were flooded.||Some of the highest storm total rainfall amounts included 6.30 inches three miles west northwest of Rockford; 6.24 inches two miles east northeast of Rockford; 5.69 inches three miles south southeast of Loves Park; 5.66 inches two miles northwest of Cherry Valley; 4.87 inches two miles west northwest of Loves Park and Rockford Airport measured 2.40 inches. Rainfall rates during the heaviest thunderstorms were between 2 to 4 inches per hour. A trained spotter reported 4 inches of rain in one hour in Loves Park between 2130 CST and 2230 CST. |
| August 2007 | Flood | Winnebago | $2,000,000 | Flooding continued from heavy rains and flash flooding earlier on August 7th. In Rockford, multiple roads closed due to flooding inlcuding Valencia, Avalon, and Churchill Grove from 9th to 20th. City officials in Rockford feared that water flowing over the spillway at the Alpine dam in Rockford would result in structural failure of the 65 year old dam. Residents in a 1200 home area immediately downstream of the dam along Keith Creek were evacuated as a precaution. Flood waters up to the first level of some houses and as many as 12 basement collapses were reported as a result of the flooding. Water came within 2 feet of flowing over the Alpine dam spillway at around 1130 AM. Severe flooding occurred within the Churchill Park area. Significant flooding also occurred along Madigan Creek in the Cherry Valley area. More than 40 residents along the creek were evacuated. About 30 homes along the creek sustained flood damage. Rainfall totals include 6.84 inches 3 miles southeast of Rockford, 6.79 inches northwest of Rockford and 4.70 inches 3 miles northeast of Rockford. The city of Rockford and Winnebago County were declared a state disaster area as a result of the flash flooding and flooding. |
| August 2007 | Flash Flood | Rockford | $1,000,000 | Over 6 inches of rain fell over southeast Rockford in a three hour period. The runoff quickly overwhelmed Keith and Madigan Creeks in Rockford as well as other streams across eastern Winnebago County. Hardest hit areas included the Keith Creek watershed in southeast Rockford, the same area that experienced flash flooding on Labor Day 2006. Twenty intersections flooded in Rockford with six cars stranded in flood waters. Illinois Central railroad tracks washed out at Malford Road just south of Harrison. |
| July 2010 | Flash Flood | South Beloit | $632,000 | Very heavy rain fell across Winnebago County producing widespread flooding and flash flooding, including creek and river flooding. Significant flooding was reported near Keith Creek in the Churchill Park area on the east side of Rockford. Route 2 was flooded and impassible near South Beloit Road. |
| July 2024 | Flash Flood | Wempleton | $500,000 | Thunderstorms producing torrential rainfall moved across southern Winnebago County and Rockford during the evening of July 14th producing significant flash flooding. Street flooding with stalled vehicles were reported all across Rockford. Multiple cars were flooded along roadways near the Alpine Dam where water levels reached two feet below the spillway. Widespread street flooding was reported near Gorham Place and Barrington Road and also near 11th Street and Broadway Street. Significant erosion occurred near roadways and parking lots at the Swedish American Hospital on State Street. Numerous basements were flooded. |
| June 2018 | Flash Flood | Wempleton | $500,000 | Torrential rain caused flash flooding in Rockford. Portions of the Rockford Mercy Health Hospital were flooded with 4 to 5 feet of water in the lowest level of the hospital. The Rockford fire department reported approximately 15 water rescues which included two cars that flipped over with people in them. No injuries were reported. Cars were submerged in flood waters in many locations including near Rockford Mercy Health Hospital; near OSF Saint Anthony Hospital; near the intersection of Brendenwood Road and Chelsea Avenue and near Van Wie Avenue and Hancock Street. Flood waters were several feet deep in many locations including flowing water in some locations. Several homes were flooded.||Storm total rainfall amounts included 5.58 inches 0.7 miles northwest of Rockford; 5.50 inches 1.5 miles east northeast of Rockford; 5.00 inches 1 mile east of Rockford; 4.80 inches 3.3 miles northeast of Rockford; 4.50 inches in Rockford; 3.10 inches 2 miles east of Rockford and 2.89 inches 5.5 miles south of Rockford. |
| June 2017 | Flash Flood | Seward | $500,000 | Very heavy rain fell across Winnebago County during the evening hours of June 28th. Numerous roads were flooded, closed and impassable due to flash flooding. In Rockford, numerous cars were stranded in flood waters with several water rescues from the stranded vehicles. Kent Creek was out of its banks. A parking lot at a pharmacy was flooded and people were unable to leave the building. Numerous residential roads were flooded and impassable in Loves Park, Machesney Park and Pecatonica. In Winnebago, 4 to 6 inches of flowing water was reported on roads. Storm total rainfall totals included 5.69 inches in Loves Park; 5.48 inches at Rockford International Golf Course; 5.21 inches at Winnebago; 5.00 inches at Pecatonica; 4.11 inches at Rockford Airport; 3.80 inches 3 miles ENE of Machesney Park and 3.46 inches 2 miles southeast of Roscoe. |
| May 2011 | Lightning | Harlem | $400,000 | A two story, eight unit apartment building was struck by lightning. The roof was engulfed in flames and the building was a total loss. All of the 15 occupants were able to exit the building safely and no injuries were reported. |
| August 2015 | Flash Flood | Camp Grant | $300,000 | Numerous reports of high water and drainage issues across the northeast and southeast portions of Rockford. Cars were stranded in standing water. Areas hit were the intersections of Sandy Hollow and Alpine, as well as streets north of 9th Avenue between 11th and 15th Streets, Churchill Park and the intersection of State and Perryville. Numerous reports of flooded basements. |
| August 1979 | Tornado (F2) | not stated | $250,000 | no account filed |
| May 2011 | Tornado (EF1) | Seward | $100,000 | This is a continuation of a tornado that started in Ogle County and crossed into Winnebago County on East Montague Road near South Conger Road. The path was nearly continuous briefly lifting near Kelly Road east of just Alworth Road, then continuing again into the west side of Machesney Park past the Kennedy Middle School which had part of its roof blown off. A persistent path of damage was observed until the end of the tornados life when damage became sporadic. Several damage indicators indicating a persistent EF1 rating were observed throughout the tornados path. There were numerous softwood trees snapped or uprooted, some up to 24-30 inches in diameter. A few hardwood trees up to 18 inches in diameter were also snapped. Many tree limbs were also downed. Structural damage included several collapsed outbuildings, damaged siding and fascia to homes, and shingles blown off roofs. Debris in numerous locations was deposited downstream from its origin, sometimes up to 400 yards. All of the damage suggested winds from 90-110 mph. |
| August 2014 | Thunderstorm Wind | Camp Grant | $50,000 | Trees were blown down at Barry Road and Kishwaukee Street. A tree fell onto a house on 18th Avenue. |
| May 2011 | Thunderstorm Wind | New Milford | $50,000 | A large tree was blown down onto a building near Route 251 and New Milford School Road. A nearby building suffered significant damage when a 50 foot ash tree fell onto the building. |
| November 2010 | Thunderstorm Wind | Harlem | $50,000 | Thunderstorm wind damage occurred near McFarland and Thomas Drive in Loves Park where shingles were blown off roofs and fascia was damaged on several houses. |
| July 2010 | Lightning | Roscoe | $50,000 | Lightning struck an underground gas line on Wild Deer Trail and a second underground gas line on Huntsboro Lane. Lightning also struck a home on Pin Oak causing a fire to start in the garage. |
| March 2009 | Thunderstorm Wind | Roscoe | $50,000 | Extensive tree damage was reported in Roscoe. The roof of one home was damaged, as well as a fence. A second home sustained roof and siding damage. Power lines were also blown down. |
| September 2006 | Lightning | Winnebago | $50,000 | The roof of a house was struck by lightning. The lightning blew out a television and started a fire which caused significant damage to the house. |
| July 1995 | Thunderstorm Wind | Rockford | $50,000 | A wind gust to 81 mph was recorded at the Rockford Airport. One small plane was blown loose and into the grass and another was flipped over. A 727 was spun 90 degrees by the wind. |
| July 2025 | Flash Flood | Latham Park | $30,000 | Torrential rain fell across portions of Rockford, Cherry Valley and Loves Park in a very short time during the late afternoon of July 10th. Several vehicles were stranded in flood waters a few feet deep in multiple locations and street flooding occurred in many areas. Video showed waist deep water on Argus Drive between Buckley Drive and Sundae Drive where at least two cars and a city transit bus were stuck in flood waters. Six passengers were on the bus when it stopped because of the flood waters and there were no injuries reported. A photo showed 2 to 3 feet of standing water on Golf Hill Road at Putter Place. A photo showed water at least one foot deep on Alpine Road at Charles Street. A photo showed flooding along East State Street. Flood waters entered at least one home and one apartment building. One motorist commented that the flooding developed very quickly as they were driving. At least 17 cars were stalled in flood waters, most just past the bottom of the doors but 2 cars had flood waters over the hoods. Hurricane Harbor, an amusement park, was flooded and was closed for 10 days. Rainfall of 2.62 inches in one hour was reported two miles east southeast of Machesney Park at 1626 CST.||Additional thunderstorms moved across some of the same areas during the early evening with additional flooding reported in Loves Park where flood waters entered the garage of an industrial building on Beacon Street.||Storm total rainfall amounts included 6.50 inches one mile east of Loves Park; 5.05 inches two miles north northwest of Machesney Park; 4.41 inches one mile northwest of Machesney Park; 3.93 inches south southwest of Rockton and 3.78 inches two miles south southeast of Loves Park. |
| May 2017 | Thunderstorm Wind | Rockton Wgn Wheel Ar | $30,000 | A large outbuilding was destroyed and another suffered roof damage. Numerous large branches were snapped and a couple large trees were blown down. |
| June 2014 | Thunderstorm Wind | Rockton | $25,000 | A garage collapsed due to severe winds. |
| May 2011 | Thunderstorm Wind | South Beloit | $25,000 | Several storage buildings sustained roof damage near Route 251 and Rockton Road. |
| June 2001 | Thunderstorm Wind | Countywide | $25,000 | no account filed |
| August 1990 | Tornado (F1) | not stated | $25,000 | no account filed |
| June 1967 | Tornado | not stated | $25,000 | no account filed |
| August 1958 | Tornado (F2) | not stated | $25,000 | no account filed |
| November 2010 | Lightning | Loves Park | $20,000 | An unoccupied restaurant was struck by lightning near North Second Street and Wood Avenue. |
| June 2010 | Thunderstorm Wind | Cherry Vly | $20,000 | Roof damage was reported to a building near Interstate 90 and Route 20. |
| June 2010 | Thunderstorm Wind | North Park | $20,000 | Wind damage was reported in a large area of Rockford. Two large trees were blown down and a roof was blown off a house on Spring Lake Road. Four large trees were blown down at Route 2 and Gleasman Road. Trees were blown down and uprooted near Route 251 and Spring Creek Road. Numerous 6 to 12 inch tree limbs were blown near SpringBrook and Hickory Roads. ComEd reported 17,700 customers lost power. |
| June 2007 | Thunderstorm Wind | Rockton | $20,000 | Trees and power lines were blown down. Siding blown off a house. A deck was damaged from a grill that was blown over and a hard top cover was blown off a pool. |
| May 2011 | Tornado (EF1) | South Beloit | $15,000 | A brief tornado touched down in the Rockton area between Route 251 and Interstate 90, just north of Rockton Road. Damage was observed around the Roscoe Fire Station, where a large garage door was blown in. Winds were estimated to be as high as 90-100 mph. |
| July 2011 | Thunderstorm Wind | North Park | $15,000 | A semi-truck was overturned in Loves Park on Perryville Road between Harlem Road and Mulford Road. State Street was closed from 9th Street to Division after a large tree was blown down taking down power lines. Rockford Park District reported that 25 parks and facilities sustained some type of storm damage, mostly from fallen trees. |
| September 2015 | Thunderstorm Wind | Rockford | $10,000 | Tree down on powerlines. |
| June 2014 | Thunderstorm Wind | Roscoe | $10,000 | A few trees were uprooted and a branch fell through a home. |
| May 2011 | Lightning | Seward | $10,000 | Lightning struck a pig-confined building along Kelley Road in Pecatonica. The damage was confined to the utility room and no livestock was lost. |
| March 2009 | Thunderstorm Wind | Rockford | $10,000 | Trees and power lines were blown down. A well built shed was destroyed with debris scattered over 100 yards downstream. |
| June 2009 | Lightning | Pecatonica | $10,000 | Lightning struck a two story building on Main Street and caused a fire in the southwest corner of the second level. |
| July 2017 | Thunderstorm Wind | Rockford | $5,000 | Numerous trees and power lines were blown down throughout Rockford. |
| June 2017 | Thunderstorm Wind | Machesney Park | $5,000 | Numerous tree limbs and a one foot diameter tree were blown down. A cemented flag pole was bent by the wind. Part of a roof was blown off a house. |
| July 2012 | Thunderstorm Wind | Machesney Park | $5,000 | A 20 to 30 foot long, six inch diameter tree limb fell through the roof of a house on Mildred Road. |
| May 2011 | Thunderstorm Wind | Colonial Gardens | $5,000 | Tree limbs, utility poles and power lines were blown down in many areas of Machesney Park. |
| May 2011 | Thunderstorm Wind | Roscoe | $5,000 | Estimated 60 mph wind gusts in the town of Roscoe downed tree branches, bent a Dairy Queen flagpole in half, and caused damage at the Roscoe Fire Department including their training facility. |
| July 2008 | Thunderstorm Wind | Rockton | $5,000 | Patio furniture and a barbeque grill were blown around and damaged. Wind damage was reported to siding and gutters of a few houses. |
| August 2007 | Thunderstorm Wind | Rockford | $5,000 | Tree branches and power lines blown down. |
| September 2007 | Thunderstorm Wind | Rockford | $5,000 | A large tree was blown down at Brooke and Saner Roads. Several two foot diameter trees were blown down on Clarine Lane. Three utility poles were also blown down. |
| July 2011 | Thunderstorm Wind | Harlem | $3,000 | High winds blew down several power lines along Alpine Road just north of East Riverside Boulevard. |
| June 2017 | Thunderstorm Wind | Camp Grant | $1,000 | Tree limbs 8 inches in diameter and power lines were blown down near 11th Street and Sandy Hollow Road. |
| May 2014 | Thunderstorm Wind | Alworth | $1,000 | Two power poles were blown down near Cunningham and Osborne Roads. |
| May 2013 | Thunderstorm Wind | Rockton | $1,000 | Power lines were blown down and utility poles were leaning over. Shredded tree branches were reported near Hononegah Road. |
| May 2011 | Thunderstorm Wind | Pecatonica | $1,000 | Large tree limbs and power lines were blown down. |
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