Marion County

Every recorded tornado

1. Injuries and deaths are for the tornado’s whole path, which may extend beyond the county. Deaths recorded within Marion 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.

Claims by ZIP code

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.

River crests

River gauges

1. Crests are the highest and the recent crests the National Weather Service lists for each river gauge in the county that has a flood stage, not every flood. Flood categories use each gauge's current flood stages; crests from before levees, dams or channel changes may not be comparable. Crests measured on an old datum are left out of the rankings.

NOAA National Water Prediction Service gauge records, retrieved October 30, 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.

Mapped landslides

Mapped by MO DNR (11), NASA (3).

1. Landslides mapped in the USGS compilation of landslide inventories across the United States (version 3.0, 2025), rated probable or better. The compilation joins inventories made by federal and state agencies for different purposes and areas, so the number mapped in a county reflects how closely it has been surveyed as much as how often its slopes fail. An area with few records may simply not have been mapped. Deaths are as recorded in the inventories; a slide listed in two inventories is counted once.

USGS Landslide Inventories across the United States, version 3.0, retrieved October 27, 2026.

More event types since 1996

Costliest events since 1996

1. Jun 3, 2008Flood$7.1 million
   National Weather Service narrative

   The Mississippi River at Hannibal, MO crested at 29.54 feet on 6/18/2008. This is the second highest crest ever recorded. The City of Hannibal escaped relatively unscathed as the flood wall and most levees north and south of town held due to work by the National Guard and volunteers. Plastic and sandbags were used to raise and cover about 60% of the levees in the County. The Mark Bottoms levee was over topped resulting in 19 homes being flooded. Highway 79 in the south part of Hannibal was closed. No other towns in the county were affected as the remainder of the land along the river is used for agriculture or conservation purposes. County Extension Service personnel estimated…

2. May 13, 2008Hail$1.0 million
   National Weather Service narrative

   Hail up to golf ball size fell on Hannibal. Most of the large hail fell on the south part of town. About 200 cars in a manufacturing company parking lot were damaged.

3. Jul 20, 2010Flash Flood$200,000
   National Weather Service narrative

   Up to 6 inches of rain fell in a short amount of time causing flash flooding. Numerous roads were flooded including several in Hannibal. Also, Bear Creek in Hannibal overflowed its banks flooding a nearby parking lot with two feet of water and 35 to 40 residents along the creek had to be rescued from their homes by boat due to the flooding.

4. Feb 27, 2011Thunderstorm Wind$100,000
   National Weather Service narrative

   Thunderstorm winds flipped over a Cessna plane destroying it and damaged three other planes at the Hannibal Regional Airport. Further to the east in town, several large trees were blown over. One large tree landed on an unoccupied car causing major damage. Also, several power lines were blown down.

5. Oct 2, 2007Tornado$100,000
   National Weather Service narrative

   A tornado touched down half a mile east of the intersection of Highway F and CR 255, about one and a quarter miles east of Woodland. Several trees and large tree limbs were blown down at this location. The tornado traveled to the northeast, damaging a machine shed near the intersection of CR 279 and CR 264. It continued to move to the northeast and skipped over a tree line before moving into the southern part of Palmyra where it damaged the Consolidated Machine & Welding Company on US Highway 61. Three of the four large corrugated steel buildings were severely damaged. One semi trailer was lifted and dropped onto 2 other trailers at this location. It then damaged a church and…

6. Oct 2, 2007Tornado$50,000
   National Weather Service narrative

   The tornado initially touched down near the intersection of West Church Street and South Breckenridge Avenue with minor tree damage. As the tornado travelled to the east northeast, additional tree damage occurred in a residential area near the far western end of West Lafayette Street. The tornado then caused damage to 3 large corrigated buildings on South Bradley Street between West Lafayette Street and West Main Cross Street. Tree and power line damage was also observed in this area. The tornado caused minor roof damage to a store on Main Street before lifting and dissipating.

7. Jun 3, 2025Thunderstorm Wind$50,000
   National Weather Service narrative

   Thunderstorm winds knocked a large tree onto power lines at the intersection of Hamilton and Dickerson in Palmyra. This caused a power outage that affected about 100 residences.

8. Apr 20, 2025Thunderstorm Wind$35,000
   National Weather Service narrative

   Two sources reported estimated 70 mph thunderstorm wind gusts west of Hannibal. Multiple instances of damage around Hannibal due to thunderstorm winds were reported, including the destruction of a trailer near Hannibal Regional Hospital.

9. Aug 26, 2006Lightning$25,000
   National Weather Service narrative

   Lightning struck a house on Ridgewood causing a fire resulting in one injury and moderate damage. A woman was treated at a local hospital for smoke inhalation.

10. Jul 29, 2025Thunderstorm Wind$20,000
    National Weather Service narrative

    Thunderstorm winds snapped several trees in and around Palmyra, including a large tree that fell on the roof of a home.

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

114°FJul 14, 1954

All-time low

−21°F3 times, most recently Dec 23, 1989

Warmest night

85°F2 times, most recently Aug 22, 1936

Coldest day

−10°FDec 22, 1989

Wettest day

5.92 inJul 20, 1949

Snowiest day

14.5 inFeb 2, 2011

Hottest year

1934mean 56.9°F

Coldest year

2014mean 50.0°F

Wettest year

198161.22 in

Driest year

195620.59 in

Snowiest season

63.1 in1977-78

Station Hannibal Wtr Wks (USC00233601), 712 ft elevation, 4.6 miles from the population centre. Daily records from 1933 to October 27, 2026; 97.4% 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 USC00233601.
• 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.
• Landslides USGS Landslide Inventories across the United States, version 3.0 (2025).
• 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.