Tioga County

Every recorded tornado

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

Every storm within 100 miles

1. Tropical storms and hurricanes (34 kt or more, still tropical) at closest approach. Post-tropical remnants with gale-force winds are listed but not counted. Direct: track within 50 miles; near: within 100 miles. Distance is measured to the county boundary for counties and to the city centre for cities, using positions interpolated hourly between HURDAT2 fixes.

National Hurricane Center HURDAT2, 1851 to 2025.

Every large fire

1. Large fires mapped by the Monitoring Trends in Burn Severity program since 1984: 1,000 acres or more in the West, 500 or more in the East. Prescribed burns are excluded. Acres here are the part of each perimeter inside this place.

Monitoring Trends in Burn Severity (USGS and U.S. Forest Service), 1984 to 2026.

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.

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 NASA (1).

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. Nov 8, 1996Flash Flood$2.5 million
   National Weather Service narrative

   Flooding caused $2.5 million in damage to roads and bridges in the county and destroyed 2 dozen homes and heavily damaged many others. County declared a disaster area.

2. Sep 7, 2011Flood$450,000
   National Weather Service narrative

   A section of Business Route 15 near Mansfield was closed Wednesday night (9/7) into Thursday morning (9/8) by flood waters from the Tioga River and Canoe Camp Creek. The impacted stretch of roadway reopened by Thursday afternoon. This relatively short section of road runs from the southern edge of Mansfield Borough southward into Richmond Township, near the highway access to new Route 15.||A few homes were evacuated along a private road near Mill Creek. Some secondary township roads were also closed. Damages were estimated at $449,652 for public facilities in the county.

3. Jul 12, 2021Flash Flood$300,000
   National Weather Service narrative

   At 1935 EDT Tioga County is activating their EOC to an enhanced level due to flooding conditions throughout the county. Trailer park on Benedict Lane in Roseville is being evacuated, one foot of water and rising. Rt 660 in Delmar Township is flooded. Route 6 in Mansfield is flooding. Numerous roadways washed out and flooded. |At 2020 EDT Roseville area at 73 Benedict Road (in Mansfield) a Mobile Home Park is flooding, 10 residents are being evacuated to the Mansfield Fire Department. Route 549 and Route 6 in Roseville are underwater in multiple locations. Route 549 is passable, but has substantial debris on the roadway from the flooding. At 2246 EDT a total of 38 persons were…

4. Mar 16, 2025Thunderstorm Wind$100,000
   National Weather Service narrative

   An NWS Storm Survey confirmed that a downburst, with maximum winds estimated near 100 mph, occurred along Balsam Road in Tioga County during the afternoon hours of March 16, 2025. Numerous pine trees were snapped and uprooted, leading to some roof damage at households on Balsam Road. A utility pole was downed along with several shingles of a couple of buildings being blown off in the vicinity. On the northwest side of Balsam Road, multiple softwood trees had their trunks snapped.

5. Mar 13, 2006Thunderstorm Wind$50,000
   National Weather Service narrative

   A line of thunderstorms produced straight-line winds which damaged two farms (one on Barber Rd and another on East Hill Rd ) in Covington Township. This area is located just east of Covington. There was damage to barn roofs, silo roofs, outbuildings, and a number of large trees were uprooted. A grain wagon was flipped and a double-wide trailer, which was tied down, was moved 6 to 12 inches off its foundation. Power lines were reported down. Windows were broken in a nearby farm house. Maximum wind gusts were estimated at 70 to 75 mph. No injuries were reported.

6. Aug 9, 2003Flash Flood$50,000
   National Weather Service narrative

   Flash Flooding was reported around throughout Tioga county during the evening of August 9th through the early morning of August 10th 2003. Flood waters closed three county owned bridges, which needed to be surveyed by engineers to deem them safe. Numerous reports of road damage from flood waters were received, including shoulder damage, drain pipe damage and guard rail damage. This occurred mainly in the townships of Jackson, Charleston and Middlebury. In the town of Wellsboro, Clemens Road was partially washed away.

7. May 16, 2009Thunderstorm Wind$45,000
   National Weather Service narrative

   Thunderstorm winds estimated at around 60 mph snapped off approximately 50 trees and uprooted 6 large trees along Skyline Drive in Jackson Township about 4 miles west of Millerton. The damaging winds also leveled a green house and collapsed a small barn. Some minor structural damage to a garage also took place on East Lawrence Road.

8. Feb 22, 2026Strong Wind, Tioga$30,000
   National Weather Service narrative

   Wind gusts associated with the coastal system knocked down a tree onto power lines that was then knocked down onto a PennDOT truck on State Route 287 in Delmar Township. No injuries were reported from this incident; however, the roadway was closed during the early morning hours of February 23, 2026. Gusty winds began during the late evening hours of February 22nd and continued into the mid-morning hours of February 23rd, where highest estimated wind gusts were 45 mph.

9. Jun 10, 2008Thunderstorm Wind$30,000
   National Weather Service narrative

   The Tioga County emergency manager reported a fairly large area of wind damage about three miles east of Liberty on Route 414. The damage included a church steeple blown off, two large trees down onto a house and a large farm building collapsed. The storm continued to move along Route 414 into Bradford County, where additional storm damage occurred. No injuries were reported.

10. May 30, 2011Tornado$25,000
    National Weather Service narrative

    An official NWS survey confirmed an EF1 tornado in Knoxville in Tioga County around 0145 EDT 30 May 2011. The tornado touched down on Fork Hill approximately one-half mile northwest of the intersection of PA 249 and 49 and traveled east for about 2.5 miles through Knoxville just north of PA 49 before lifting just east of Academy Corners. Damage indicators included about 250 uprooted/snapped trees and moderate to major damage to 8 residential homes. In total, 25 homes were affected and a roof was torn from a community center. The surveyed damage was consistent with an EF1 tornado. There were no injuries or fatalities.

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

104°F2 times, most recently Jul 9, 1936

All-time low

−30°FFeb 28, 1934

Warmest night

74°FJul 9, 1936

Coldest day

−2°F2 times, most recently Jan 18, 1977

Wettest day

6.50 inAug 27, 1937

Snowiest day

36.0 inMar 14, 1993

Hottest year

1931mean 49.5°F

Coldest year

1977mean 42.2°F

Wettest year

201858.62 in

Driest year

198820.55 in

Snowiest season

122.8 in1977-78

Station Wellsboro 4 Sw (USC00369408), 1,818 ft elevation, 12.0 miles from the population centre. Daily records from 1926 to October 23, 2026; 90.7% 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 USC00369408.
• 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.