| April 1996 | Thunderstorm Wind | Countywide | 2 killed, $100,000 | no account filed |
| May 1985 | Tornado (F2) | not stated | 15 hurt, $2,500,000 | no account filed |
| May 1985 | Tornado (F3) | not stated | 10 hurt, $2,500,000 | no account filed |
| June 1985 | Tornado (F2) | not stated | 2 hurt, $250,000 | no account filed |
| July 1967 | Tornado (F2) | not stated | 2 hurt, $250,000 | no account filed |
| July 1999 | Thunderstorm Wind | Countywide | 2 hurt, $60,000 | Trees and power poles downed across the county with a 60 mph gust measured in Orwell. The library in Orwell lost some its siding and the Orwell Fire Department was damaged when fallen trees poked three 15 inch holes into its roof. Many trees were also downed in and around Jefferson. A large tent was blown down and thrown 200 feet at an outdoor party north of Jefferson. Two women of unknown age standing under the tent were injured slightly. |
| July 1999 | Lightning | Lakeshore | 2 hurt | A 26 year old male and a female of unknown age were struck by lightning while picnicking at Lakeshore Park in Ashtabula Township. Both people received minor injuries and were taken to a local hospital where they were treated and released. |
| July 2005 | Lightning | Geneva | 1 hurt | A man was struck by lightning while trying to rescue his dog which was also struck by lightning seconds earlier. Unfortunately, the dog did not survive the lightning strike. The man sustained non life threatening injuries and was expected to make a full recovery. |
| July 1999 | Lightning | Lakeshore | 1 hurt | A male of unknown age was stuck by lightning at Great Lakes Marina. The person received minor injuries and was taken to a local hospital for treatment. |
| July 2006 | Flash Flood | Countywide | $12,800,000 | A second round of thunderstorms moved across Ashtabula County during the early morning hours of July 28th. Rainfall rates exceeded two inches per hour at times. Some rainfall totals from late afternoon on July 27th through the early morning hours of the 28th included: 5.88 inches in Trumbull Township; 4.30 inches in Geneva; 3.45 inches at New Lyme and 3.33 inches at Jefferson. Widespread flooding occurred across the county as runoff from this rain made it into area streams and rivers. Coffee Creek went into flood in Austinburg and caused extensive damage. At least five homes in the town were destroyed and another 20 sustained severe damage. Three homes in Jefferson had water on their ground floors after a small creek left it's banks. Flood waters on Hillyer Drive were reported to be over three feet deep. At least nine homes in the Geneva area sustained major damage after Cowles Creek left it's banks. Several families in the area had to be evacuated. Many roads including State Routes 45, 307 and 46 and U.S. Route 20 had to be closed because of flooding. In Harpersfield Township, Cold Springs Road was washed out by Bronson Creek. At least four roads were washed out elsewhere in the county and there were multiple road closures reported in Trumbull, Geneva, Saybrook, Morgan, Austinburg and Monroe Townships. Around 40 homes in the county suffered major damage from flooding with dozens more sustaining lesser damages. Most of these were in Jefferon, Austinburg and Geneva Townships. Damage to roads, bridges, culverts and other public infrastructure from the flash flooding events of July 22nd and 28th totaled nearly $2 million. Crop losses are also expected to be substantial as standing water was reported in many areas. |
| February 2020 | Flood | Sullivan | $10,000,000 | Record Lake Erie water levels for February resulted in continued and exasperated lakeshore flooding and erosion. There were two storm events that brought lakeshore flooding to the western basin on the 5th and 6th, and the other on the 27th. In addition to these wind driven events, weakened shorelines showed signs of collapse and erosion throughout the month. Erosion was made worse by the lack of ice over the winter. Lake Erie reported only .4 percent of ice coverage compared to the average of 67 percent in mid February. The lack of ice supported increased wave runup, eroding away cliffs, washing out beaches and damaging shoreline infrastructure.||Of note, in Geneva on the Lake the Geneva Township Park lost 45 feet of land between the 3rd and 13th of the month. About 600 feet of the parks 916 feet of lakefront was affected. Similar if less severe erosion occurred across all of Lake Erie lakeshore counties. |
| July 2006 | Flash Flood | North Portion | $7,500,000 | Thunderstorms dumped heavy rains on the northern portion of Ashtabula County during the morning hours of July 22nd. Flooding quickly developed as runoff from the rain caused rapid rises in area streams and rivers. Locations along and north of Interstate 90 saw the worst flooding. Spotters in the City of Ashtabula measured 7.2 inches and 6.04 inches of rain. Much of this rainfall fell between 8 and 11 a.m. Other reports from across the county included: 3.7 inches at North Kingsville and 3.5 inches in Saybrook Township between 6 and 11 a.m. In Ashtabula, extensive flooding occurred on Clermont Drive, Howard Road and Jefferson Road. Flood waters were up to three feet deep on these streets and water was reported on the ground floors of several homes. Many homes had to evacuated because of the rising water and dozens of other homes in the city experienced basement flooding. In Saybrook Township, extensive flooding was reported along U.S. 20 from Sanborn Road to State Route 45. Businesses along this stretch of road reported ground floor flooding. A lot of flooding also occurred on McNutt Avenue. Many people were evacuated from homes in this area. Several roads were washed out in Saybrook and Ashtabula Townships. At least one person had to rescued from a stranded vehicle. Over a 100 homes in the county were damaged, mainly by basement flooding. Several roads and bridges were also damaged by flooding. |
| March 2020 | Flood | Conneaut Harbor | $5,000,000 | Lake Erie continued its seasonal rise from February to March, rising about 2 inches to a level of 573.98 feet. This level was a new record high monthly mean water level for March, surpassing its previous record set in 1986 by 3 inches. The March 2020 level was also 12 inches above the March 2019 level and 34 inches above its long term average level. Lack of lake ice supported higher and more repetitive wave action along the shoreline, resulting in continued beach and cliff erosion. |
| November 2017 | Tornado (EF2) | Wick | $1,500,000 | An EF0 tornado touched downed in a field in rural Wayne Township near the southern border of Ashtabula County. The initial touchdown occurred along Hayes Road about half way between U.S. Route 322 and the county line. A few trees were downed in the area. The tornado continued east northeast across mainly farm land while quickly intensifying to EF1 intensity. The tornado eventually reached the Williamsfield area and crossed State Route 7 just south of its intersection with U.S. Route 322. It then intensified to EF2 strength and roughly followed U.S. 322 for close to two miles. The tornado then took a turn to the northeast as it crossed Simons South Road and lifted just as it reached the Pennsylvania state line. The worst damage was observed along U.S. 322 east of State Route 7. Around 20 properties were affected by the tornado. At least four homes were destroyed with eight more sustaining major damage. The other homes along the damage path sustained lesser amounts of damage. The four destroyed homes were all within a third of mile from each other on U.S. 322. A couple garages along U.S. 322 were also leveled and tree damage was extensive. Debris was observed scattered in fields across the area. The damage path was over six and a half miles in length and up to 200 yards in width. It took several days for power to be restored in the Williamsfield area. No injuries were reported. |
| October 2000 | Thunderstorm Wind | Countywide | $1,000,000 | Thunderstorm winds estimated at 60 to 70 mph caused considerable damage across the county. Several hundred trees and 55 power poles were downed. Widespread damage was reported in Ashtabula, Pierpont, Andover, Jefferson and Geneva on the Lake. Major damage occurred at a campground just north of Andover where five homes were severely damaged by fallen trees. Over 50 trees were downed at the campground. |
| September 2004 | Flash Flood | Countywide | $800,000 | Heavy rains associated with the remnants of Tropical Storm Frances caused flooding over portions of Ashtabula County. Rain began early on September 8th and increased in intensity during the evening hours. The heavy rain continued into the 9th and finally ended just before daybreak. Rainfall totals from the event included: 2.08 inches at Ashtabula; 2.42 inches at Geneva; 2.88 inches at Jefferson; 3.00 inches at New Lyme; 3.68 inches at Conneaut and 4.66 inches at Pierpont. Significant flooding occurred along Conneaut Creek in the northeastern corner of the county. Very heavy rain fell over the headwaters of the creek in Pennsylvania and caused a rapid rise in creek levels beginning around midnight. By 12:24 a.m., a campground along Creek Road in Kingsville Township was under as much as five feet of water. 17 campers at the campground barely escaped the rapidly rising waters and had to be rescued by boat. Several roads near the creek were washed out by the flood waters. Many other roads, including State Route 7 had to be closed because of flooding. Over a dozen vehicles were damaged at an automobile dealership by flood waters up to four feet deep. Hundreds of homes and businesses were damaged by flooding. Several of these sustained significant damage. |
| May 2004 | Flash Flood | Countywide | $750,000 | A line of severe thunderstorms moved across Ashtabula County during the late afternoon hours and was quickly followed by a second round of storms. Torrential rain fell as this series of storms moved through. Spotters measured as much as four inches of rain in the southeastern corner of the county. Widespread flooding occurred across southern and central Ashtabula County as several streams and creeks quickly filled and left their banks. Three Brothers Creek went into flood south of Jefferson and washed out a section of State Route 46 between Webster and Holcomb roads just after 7 p.m. Spotters in the area measured 2.25 inches of rain during the storms. Numerous road closures were reported elsewhere in the county with dozens of homes and vehicles damaged by the flood waters. Flood waters were reported to be as much as three feet deep on a couple roads. |
| June 2010 | Tornado (EF1) | West Andover | $500,000 | An EF1 tornado touched down in eastern Ashtabula County. The initial touchdown occurred southwest of Andover near the intersection of Mann and Creek Roads. The tornado then traveled east northeast for approximately four and a half miles before lifting near the intersection of Pymatuning Lake Road and State Route 85. The tornado moved across the south side of Andover and then crossed Main Street just east of town. Significant tree damage was observed southwest of Andover. A barn in the area was heavily damaged. A warehouse on the southeast side of Andover was damaged and many trees in the area toppled. Several homes in the town sustained damage, mainly from lost roofing or siding. Many cars were also damaged from flying debris or downed limbs. Dozens of downed trees were also reported along the remainder of the damage path. Several boats were tossed into Pymatuning Reservoir just as the tornado lifted. The tornado may not have been in continuous contact with the ground the entire length of the damage path. The damage path was no more than 100 yards in width. |
| July 2008 | Flash Flood | Conneaut | $500,000 | A band of showers and thunderstorms enhanced by the warm waters of Lake Erie moved into Conneaut on the morning of the 22nd, producing significant flash flooding along the lakeshore. Doppler radar estimated between 3.5 and 5 inches of rain fell throughout the city of Conneaut in less than 1.5 hours. Major street flooding occurred, with semi trucks stranded and numerous underpasses flooded. Many structures were inundated, including a restaurant on Broad Street. |
| July 2003 | Flash Flood | South Portion | $500,000 | Heavy thunderstorm rains fell on Ashtabula County. Spotters in Colebrook Township measured 4.50 inches of rain during the day with over 3.5 inches measured in Orwell Township. Widespread lowland and street flooding was reported in southern Ashtabula County as several small streams and creeks left their banks. A few homes and buildings were damaged by flood waters up to two feet deep. Several roads had to be closed. |
| August 1994 | Thunderstorm Wind | S Portion | $500,000 | no account filed |
| July 2006 | Flash Flood | Countywide | $400,000 | Heavy thunderstorm rains fell on Ashtabula County during the late afternoon and early evening hours of July 27th. Two to four inches of rain was reported throughout the county with much of it falling between 5 and 6 p.m. Cowles Creek went into flood in the northwest part of the county and flooded State Route 534 with one to two feet of water. A 13 year boy was swept into the creek and had to be rescued around 7:30 p.m. A culvert along State Route 534 in Trumbull Township was also washed out. Several other roads in the county had to be closed because of flooding. Over two dozens homes sustained damage, mainly from basement flooding. |
| February 2011 | Flood | Conneaut | $300,000 | Heavy rain and rapid snow melt led to a rapid rise in rivers and streams across Ashtabula County. Rainfall amounts of 2 to 2.25 fell on top of six to ten inches of heavy snow. This snow rapidly melted as temperatures warmed into the 50s on the 28th. Up to an additional inch of water equivalent rainfall was released from the melted snow. Small streams and creeks came out of banks flooding farmland, roads, and a few homes. |
| May 2010 | Thunderstorm Wind | Jefferson | $300,000 | Thunderstorm downburst winds produced a swath of damage across northern Ashtabula County. Damage stretched from the Jefferson area northeastward across Sheffield Township and into the Conneaut area. Significant tree damage was reported in Jefferson. A residence in Sheffield Township along Peebles Road had nearly 70 trees toppled. Dozens of trees were also downed in the Conneaut area with at least five homes in the town heavily damaged by fallen trees. Scattered downed trees were reported across the remainder of the area. Many power outages were reported. |
| June 2010 | Tornado (EF1) | Amboy | $300,000 | An EF1 tornado touched down near the intersection of Lake Erie Avenue and Point Drive on the west end of Conneaut. The tornado then traveled east approximately two and a quarter miles before lifting near the Intersection of Broad and Russell Streets. The damage path was no more than 100 yards in width and consisted of mainly downed trees and limbs Some roof damage was also observed, The roof of at least one garage was completely torn off. Many vehicles were damaged by fallen trees and flying debris. |
| June 2024 | Flash Flood | North Kingsville | $250,000 | Extensive road flooding in the Kingsville and North Kingsville areas, including OH-84 and OH 193 which were closed due to flooding. Fox Road east of OH-84 closed due to a washed out road culvert due to flooding. A few reports of basement flooding as well. Radar estimated 4 to 5.5 inches of rainfall in a 1.5 to 3 hour period. |
| May 1985 | Tornado (F4) | not stated | $250,000 | no account filed |
| April 1961 | Tornado (F1) | not stated | $250,000 | no account filed |
| July 1956 | Tornado (F2) | not stated | $250,000 | no account filed |
| November 2017 | Thunderstorm Wind | Wayne | $200,000 | Thunderstorm downbursts winds estimated to be at least 70 mph leveled two barns on Cream Ridge and a third on Creek Road just north of Ford Road. Trees in the area were also downed. The parent thunderstorms responsible for this damage also produced the EF2 tornado at Williamsfield. |
| June 2013 | Flash Flood | Conneaut Harbor | $200,000 | Upwards of 4.25 inches of rain fell across Ashtabula County, overwhelming drainage systems, flooding streets and roads, submerging basements and damaging property in communities south of Interstate 90. A Conneaut motorist was unhurt when her vehicle drove into high water on Broad Street. No weather-related injuries were reported, according to safety personnel. In the Ashtabula Harbor, water was knee-high at the intersection of West 9th Street and Thayer Avenue flooding the neighborhoods of Treelane, Saybula and Westshore drives. Several roadways and state highways were closed because of high water. Route 193 was shut down between routes 307 and 167 in the Dorset area, and Route 531 just east of Geneva-of-the-Lake. |
| June 2013 | Flash Flood | Dorset | $200,000 | A residential property on route 193 and Tower Road was inundated by about 6 inches into the first floor of the property destroying most of their belongings. An office building nearby was also under water. The flooding was the result of a small slow moving thunderstorm that had rainfall rates measured by a nearby COOP observer at 4.8 per hour. |
| May 2011 | Thunderstorm Wind | Jefferson | $200,000 | Thunderstorm winds downed several large trees and power lines. Farm equipment was overturned and a roof was blown off a barn. Siding on an industrial building was damaged during this event as well. |
| May 2011 | Tornado (EF0) | Pierpont | $200,000 | An EF0 tornado touched down west of Pierpont near the intersection of Lewis Road and State Route 167. The tornado continued east along State Route 167 for just over a mile before lifting just west of the center of Pierpont. Ten homes and buildings along the damage path sustained damage, mainly from lost roofing or siding. Many trees were also downed. Straight line winds may have contributed to the damage path which was no more than 100 yards in width. |
| August 2004 | Flash Flood | Countywide | $200,000 | Thunderstorms dumped up to three inches of rain on portions of Ashtabula County. Runoff from this rain caused widespread lowland flooding. Several roads and streets had to be closed because of flood waters up to two feet in depth. At least one car became stranded in a flooded underpass in Ashtabula. Flood waters damaged several businesses in Ashtabula. Dozens of buildings elsewhere in the county experienced basement or nuisance flooding. |
| June 1996 | Lightning | Pymatuning | $200,000 | no account filed |
| May 2004 | Thunderstorm Wind | Countywide | $175,000 | A line of severe thunderstorms moved across Ashtabula County and downed hundreds of trees and caused widespread power outages. Several homes and vehicles in the county were damaged by fallen trees. |
| May 2014 | Flash Flood | Geneva | $150,000 | A tributary to the Ashtabula River came out of its banks on the evening of May 21st after an estimated 2 inches of rain fell within an hour and a half. The small unnamed creek came out of it's banks near the University Hospital Medical Center near Britton Drive. A trailer park was inundated with several feet of water from this same creek, yet the raised levels of the trailers prevented flooding in the homes. A construction site near the creek sustained significant damages to supplies from the fast moving water. Main Street was closed just west of town due to the same creek's floodwaters. |
| May 2011 | Thunderstorm Wind | Geneva | $150,000 | A thunderstorm downburst caused damage in Geneva. A swath of damage was observed from near Geneva High School northeast to near the intersection of U.S. Highway 20 and South Myers Road. A house near the high school lost a large section of roof. Another 8 to 10 homes were damaged in a neighborhood just to the west of South Myers Road and to the south of U.S. 20. Most of this damage was caused by fallen trees and limbs. Many trees were damaged along the damage path which was over a mile in length. |
| July 2008 | Flash Flood | Austinburg | $150,000 | Heavy rainfall of 2 to 4 inches fell in an east-west line across Ashtabula County just north of Jefferson. Several flooded basements were reported due to high creek flows, and multiple roads in the area were closed due to high water, including State Route 306 northwest of Jefferson. |
| July 2006 | Flash Flood | Southwest Portion | $150,000 | Thunderstorms dumped locally heavy rains on the southwestern corner of Ashtabula County. Some flooding was reported in the Windsor area. Flood waters crept into the ground floor of a nursing home. Several residents had to be removed from their rooms. No injuries were reported but the facility did suffer some damage. Homes in the area also were damaged, mainly from basement flooding. |
| June 2004 | Flash Flood | South Portion | $150,000 | Thunderstorms dumped two to four inches of rain on the southern portion of Ashtabula County during the evening hours. Widespread lowland and street flooding was reported. Some of the worst flooding occurred south of Jefferson where State Route 11 had to be closed. Several motorists became stranded in flood waters up to two feet deep. Many other roads in the southern half of the county also had to be closed. Dozens of homes and vehicles sustained flood damage. |
| June 2002 | Thunderstorm Wind | Mechanicsville | $125,000 | Thunderstorm winds downed at least five trees. Three buildings were damaged and a truck was destroyed. A grain bin was also toppled. |
| June 2025 | Flash Flood | Ashtabula | $100,000 | Widespread basement and street flooding in Ashtabula, with several videos of flowing water of six inches or more across roadways. Radar estimated 2.75 to 3.5 inches of rainfall in a two to three hour period, which roughly equates to a 50 year recurrence interval. |
| July 2021 | Flash Flood | Ashtabula | $100,000 | Several roads closed due to flowing high water. Vehicles stranded in high water at West Avenue and West 34th Street, West 58th Street and Jefferson Road. Underpass on Main Avenue inundated with 5 to 6 feet of water, stranding a vehicle. Several reports of flooded basements in the area. |
| May 2010 | Flash Flood | Clark Corners | $100,000 | Slow moving thunderstorms dumped locally heavy rainfall on portions of Ashtabula County. Rainfall rates at times were more than two inches per hour. Small streams and creeks in the northeastern corner of the county left their banks causing some flooding. State Route 7 was flooded in three locations between State Route 84 and Hildom Road. Water flowing over the ground leaked into the basement of a home along State Route 7 and caused a fair amount of damage. Several secondary roads in the area also had to be closed because of flooding. Local residents indicated that this flooding was the worst they had seen in the area in nearly 40 years. |
| February 2009 | Thunderstorm Wind | Bushnell | $100,000 | A trained spotter estimated wind gusts of approximately 60 mph. The spotter also reported that twelve utility poles were snapped just south of Conneaut near the intersection of routes 7 and 84. |
| June 2005 | Lightning | New Lyme | $100,000 | Lightning struck an oil well storage tank in New Lyme Township around 6 p.m. A second oil well was struck by lightning at 6:54 p.m. in Rome Township. Fires resulted from both of these strikes. Oil was spilled at both sites and cleanup crews had to be dispatched to contain the spills. |
| May 2004 | Flash Flood | Countywide | $100,000 | Heavy rain producing thunderstorms moved across Ashtabula County. Up to an inch of rain fell on ground already saturated from rains the previous few days. Flash flooding resumed in the county after streams and creeks once again quickly rose. Several roads had to be closed because of flood waters up to two feet deep. Several homes and vehicles were damaged. |
| May 1995 | Thunderstorm Wind | not stated | $80,000 | Southern two-thirds,Trees were downed in a number of locations including Colebrook Township where a barn and several outbuildings were damaged and utility poles were downed. Barns also suffered significant damage in Wayne and Wayne Township. Minor roof damage occurred to several homes. |
| June 2009 | Hail | Wayne | $75,000 | Golf ball size hail was observed. |
| July 1999 | Thunderstorm Wind | Countywide | $75,000 | Dozens of trees and power lines downed across the county. Around a dozen trees were blown down in Ashtabula with eight trees were downed in Jefferson. A cemetery in Jefferson had several grave stones e damaged by fallen trees. A fallen tree did significant structural damage to a house in Geneva on the Lake with another tree downed on a house in Saybrook. |
| January 1999 | Flash Flood | Kingsville | $75,000 | An ice jam broke on Conneaut Creek. Nearby homes were flooded. |
| January 1999 | Flash Flood | Ashtabula | $75,000 | An ice jam on the Ashtabula River at Northcoast Marina and Yacht Club broke loose and snapped the docks apart like twigs. The river also flooded bottom land and at least one road. Other rural roads were flooded by melting piles of snow. |
| June 1997 | Thunderstorm Wind | Countywide | $75,000 | no account filed |
| June 2013 | Thunderstorm Wind | Jefferson | $70,000 | The media reported numerous trees down in Jefferson and Sheriff's office confirmed trees and powerlines down across the county. First Energy reported 5000 customers lost power. |
| July 1997 | Thunderstorm Wind | Countywide | $60,000 | no account filed |
| July 1995 | Thunderstorm Wind | Countywide | $60,000 | no account filed |
| June 2024 | Flash Flood | Ashtabula | $50,000 | Widespread road flooding in Ashtabula and Plymouth areas. Some reports of basement flooding as well. Many of the roads flooded due to creeks coming out of their banks. A few cars stranded in a flooded underpass on Main Avenue in Ashtabula. Radar estimated 4 to 5.5 inches of rainfall in a 1.5 to 3 hour period. Two rain gauge reports in Plymouth reported nearly 6 inches of rainfall over a three hour period. |
| June 2005 | Flash Flood | South Portion | $50,000 | Thunderstorms dumped locally heavy rains on the southern portion of Ashtabula County. An estimated three inches of rain fell in the Andover area. Extensive flooding occurred in Andover with several streets, including U.S. Highway 6 briefly closed. Flood waters greater than 6 inches deep were also reported in Orwell. |