Henry County

Every recorded tornado

1. Injuries and deaths are for the tornado’s whole path, which may extend beyond the county. Deaths recorded within Henry County: 0.
2. Weak tornadoes were under-recorded before Doppler radar coverage became national in the early 1990s, so earlier decades read low. Ratings use the Fujita scale before February 2007 and the Enhanced Fujita scale after.

Storm Prediction Center severe weather database, 1950 to 2025.

Smoke overhead

1. A smoke day is a date on which a smoke plume traced by NOAA Hazard Mapping System analysts from satellite imagery covered this place's point (the county's population centre or the city centre). Counts here are of medium or heavy smoke. Since 2018 analysts have often drawn light smoke as one area over most of the continent, so light-smoke counts are not comparable from year to year. The plumes show smoke anywhere in the air above, not air quality at the ground, and smoke hidden by cloud is missed.

NOAA Hazard Mapping System smoke analysis, 2011 to 2026, retrieved October 30, 2026.

This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).

OpenFEMA NFIP Redacted Claims v3, refreshed August 4, 2026. NOAA Storm Events through 2026.

1. The Palmer Drought Severity Index is computed by NOAA each month from the county's average temperature and precipitation, relative to the county's own climate. Zero is normal; -3 or lower is severe drought and -4 or lower extreme drought. It describes the long-term balance of moisture, not water supply or crop losses.

NOAA NCEI nClimDiv county Palmer Drought Severity Index, 1895 to September 2026, issued October 6, 2026.

Every earthquake of magnitude 4 or more within 50 miles

1. Earthquakes of magnitude 2.5 or more in the USGS Comprehensive Catalog since 1900. Within 50 miles means the epicentre lies within 50 miles of the county boundary (or inside the county).
2. Small earthquakes were under-recorded before the modern seismic networks of the 1970s and are still missed in remote areas, so early decades read low. Magnitudes are as the catalogue reports them and mix scales (moment, local and body-wave).

USGS ANSS Comprehensive Earthquake Catalog, 1900 to present, retrieved October 30, 2026.

More event types since 1996

Costliest events since 1996

1. May 10, 2003Tornado$1.0 million
   National Weather Service narrative

   Tornado developed 3.3 miles west northwest of Mt Pleasant and moved east northeast passing 2.6 miles north of Mt Pleasant, to 3.5 miles west and 2.2 miles north of Mt Union. The tornado exited into Louisa County 3.1 miles north northeast of Mt Union at 1905 CST. Length was 16.4 miles in Henry County Iowa and rated F1 based on damage to farm houses to the west and north of Mt Union.

2. Jun 1, 2008Flood$535,000
   National Weather Service narrative

   Major to record flooding occurred during the month of June 2008 with most forecast points above flood stage for the majority of the month. The flooding during this month was more prolific and severe than the flooding in April 2008, and the flooding in April had been the most prolific flood event since 1997.||While some locations were still experiencing flooding as June began, many of the tributary rivers to the Mississippi in Iowa rose above flood stage during the first few days of the month. At locations that were already above flood stage, the rivers stopped their fall and began climbing again.||Persistent heavy rain from late May into early June resulted in record crests on the…

3. May 10, 2003Thunderstorm Wind$500,000
   National Weather Service narrative

   A strong spring storm system moved through the Mississippi valley during the late afternoon and evening hours producing widespread severe weather. In an unprecedented move, WFO Quad Cities held a press conference the day before to warn of a high probability of significant tornadoes in the afternoon and evening hours of Saturday May 10th, with the area most at risk south of a Keosauqua, Iowa to Princeton, Illinois line. Supercell thunderstorms developed and continued into the evening hours spawning several long track tornadoes and produced copious amounts of large hail. Luckily, most of the tornado tracks were in open country and therefore damage was minimized.

4. Aug 13, 2010Flood$500,000
   National Weather Service narrative

   Heavy rains during the second week of August resulted in the Skunk River at Augusta going above the moderate flood stage level of 17 feet on August 13 around 2 pm CDT. It crested above the major flood stage level around 23.3 feet around 1 pm CDT August 16. It fell below the moderate flood stage level around 920 am CDT August 24.

5. May 3, 2012Tornado$500,000
   National Weather Service narrative

   The tornado began near 120th street near Wayland in Henry County and moved northeast to near Crawfordsville in Washington County. The tornado was on the ground for approximately 10 minutes in Henry County. Damage along the path of the tornado included: several farm outbuildings destroyed, roof damage to homes, trees snapped, and power poles damaged. The most severe damage occurred near and to the northeast of Noble (Washington County) where several turkey farms sustained extensive damage and two large wooden truss power poles were snapped off. Two homes between Noble and Crawfordsville had the roof removed as well as the exterior walls on the upper floor. One of the homes had a…

6. Oct 29, 2004Thunderstorm Wind$450,000
   National Weather Service narrative

   Main axis of damage is a less than a mile wide path running from 1.3 miles NNW of Rome (near the intersection of White Oak Rd and 208th Street) to 3.2 miles E of Winfield on 120th Street. Between 4 miles Northwest of Mount Pleasant to 2 miles NNE of Mount Pleasant, the damage path widened to 4 miles. Numerous trees and powerlines were downed with severe damage to an ANR pipeline pumping station located northwest of Mount Pleasant. Three homes suffered significant damage...including one which was blown off its foundation while another lost its roof. Numerous outbuildings and sheds were destroyed with grain wagons overturned. The Winfield cemetary (located southeast of town) had its…

7. Sep 13, 2008Flash Flood$250,000
   National Weather Service narrative

   Heavy rains caused flash flooding in Oakland Mills, IA, Mount Pleasant, IA, Mount Union, IA and New London, IA during the morning of September 13.||Near Oakland Mills, a campground along the Skunk River had to be evacuated due to the rapidly rising river level.||In Mount Pleasant, sewers were backed up, several streets were flooded, cars were stranded in flood waters, and several basements flooded.||South of Mount Pleasant, Big Creek near Highway 218 and 295th St flooded out of its banks and several area ditches were full with flood waters.||In the Mount Union area, several roads were under water.||In New London, where 24-hour rainfall totals ranged between 5.5 and 8.5 inches,…

8. Feb 24, 2007Ice Storm, Henry$129,000
   National Weather Service narrative

   According to the Mt. Pleasant News, a direct injury from hypothermia occurred in the city of Winfield. An unidentified young woman was found semi-unconscious on February 25, with a low body temperature and transported to a hospital. She was treated and eventually recovered. With the power out due to the ice storm, the temperature in the house dropped into the mid 40s.

9. May 10, 2003Thunderstorm Wind$100,000
   National Weather Service narrative

   A strong spring storm system moved through the Mississippi valley during the late afternoon and evening hours producing widespread severe weather. In an unprecedented move, WFO Quad Cities held a press conference the day before to warn of a high probability of significant tornadoes in the afternoon and evening hours of Saturday May 10th, with the area most at risk south of a Keosauqua, Iowa to Princeton, Illinois line. Supercell thunderstorms developed and continued into the evening hours spawning several long track tornadoes and produced copious amounts of large hail. Luckily, most of the tornado tracks were in open country and therefore damage was minimized.

10. Apr 30, 2003Hail$100,000
    National Weather Service narrative

    Supercell thunderstorms developed in the afternoon and evening north of a warm front that ran from Southern Iowa into Central Illinois. Three distinct supercells produced a majority of the wind, hail, and heavy rain reports from Jefferson County Iowa into Henry County Illinois. Mercer County Illinois was under tornado warnings on a continuous basis for 2 hours. Officials at a high school track meet in Aledo, Illinois ushered all students into the safety of the school resulting in no injuries. The training of the supercells from Louisa County Iowa to Henry County Illinois dumped heavy rain over the Edwards River and Pope Creek basins in Illinois with radar estimating 9 inches of…

1. Storm Events records before 1996 cover only tornadoes, thunderstorm wind and hail. Damage figures are as reported by the National Weather Service at the time, not adjusted for inflation.

NOAA NCEI Storm Events Database, 1950 to 2026, issued October 26, 2026.

All-time high

111°F2 times, most recently Jul 15, 1936

All-time low

−27°FFeb 13, 1905

Warmest night

84°FJul 27, 1936

Coldest day

−10°FFeb 3, 1996

Wettest day

6.28 inJun 29, 1933

Snowiest day

13.5 inJan 26, 1967

Hottest year

1998mean 57.3°F

Coldest year

1917mean 48.1°F

Wettest year

201054.13 in

Driest year

195622.87 in

Snowiest season

68.2 in1911-12

Station Burlington Municipal Airport (USW00014931), 683 ft elevation, 25.7 miles from the population centre. Daily records from 1897 to October 26, 2026; 99.6% of days in the last 30 years are complete. Records at a single station can differ from a city’s official threaded record, which may combine several stations.

NOAA NCEI Global Historical Climatology Network Daily.

This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).

OpenFEMA Disaster Declarations Summaries, retrieved October 30, 2026. Statewide declarations are not listed.

Neighbouring counties

• Tornadoes NOAA Storm Prediction Center severe weather database, through 2025.
• Tropical cyclones NOAA National Hurricane Center HURDAT2 (Atlantic; Northeast and Central Pacific), through 2025.
• Wildfire USGS/USFS Monitoring Trends in Burn Severity, through 2026.
• Storm events NOAA NCEI Storm Events Database, through 2026.
• Flood insurance OpenFEMA NFIP Redacted Claims v3, refreshed August 4, 2026.
• Declarations OpenFEMA Disaster Declarations Summaries v2, retrieved October 30, 2026.
• Weather records NOAA NCEI Global Historical Climatology Network Daily, station USW00014931.
• River crests NOAA National Weather Service, National Water Prediction Service river gauges, retrieved October 30, 2026.
• Drought NOAA NCEI nClimDiv county Palmer Drought Severity Index, through September 2026.
• Smoke NOAA NESDIS Hazard Mapping System smoke analysis, retrieved October 30, 2026.
• Earthquakes USGS ANSS Comprehensive Earthquake Catalog (ComCat), retrieved October 30, 2026.

Joins, thresholds and known limits are set out in the methodology. Found an error? Report it. Page built October 30, 2026.