Williamsport

Every recorded tornado

1. Injuries and deaths are for the tornado’s whole path, which may extend beyond this area.
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.

Flood insurance figures are for Lycoming County, the county that contains Williamsport.

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 in Lycoming County, the county that contains Williamsport.

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.

The drought index is for Lycoming County, the county that contains Williamsport.

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 city centre.
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

Landslides mapped in Lycoming County.

Mapped by NASA (2).

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. Oct 21, 2016Flash Flood$26.0 million
   National Weather Service narrative

   Heavy rainfall brought flash flooding to parts of Lycoming County during the early morning hours of Friday, October 21st. The Loyalsock and Lycoming Creek watersheds were most heavily impacted. The flooding destroyed or seriously damaged multiple State and local roads and bridges. Over twenty primary residence homes were either destroyed or sustained major damage. Many camps and seasonal homes were also damaged or destroyed along Pleasant Stream, Wallis Run and Slacks Run.||An 8 ���inch liquid petroleum line was also damaged along the Loyalsock Creek and posed a significant environmental impact.||Multiple state and municipal roads and bridges were impacted. For several days…

2. Sep 7, 2011Flood$11.0 million
   National Weather Service narrative

   Loyalsock Creek at Loyalsockville crested at record/major flood level of 19.78 feet. Flood stage is 12.0 feet. The West Branch of the Susquehanna River at Muncy crested in moderate flood stage of 26.7 feet. Flood stage is 20.0 feet. This is the 9th highest crest all time. The West Branch of the Susquehanna River at Montgomery crested in moderate flood stage of 26.7 feet. Flood stage is 20.0 feet. This is the 12th highest crest all time.||Muncy Creek flooded extensive areas near Hughesville and Muncy. Residents reported the creek overflowing its banks and rushing down 5th Street flooding homes and yards. One home had its chimney and foundation washed away. Others reported extensive…

3. Jun 28, 2016Thunderstorm Wind$1.0 million
   National Weather Service narrative

   A severe thunderstorm produced winds around 100 mph near Muncy in Moreland Township. The winds destroyed a large chicken coop, nearly 600 feet by 70 feet, capable of housing over 80,000 chickens (there were no chickens in the structure when the storm hit). A NWS storm survey observed that the sturdy construction was completely uplifted and destroyed by a microburst. There were 6 persons in the structure, but none were injured.

4. Sep 7, 1999Flash Flood$1.0 million
   National Weather Service narrative

   The remnants of Hurricane Dennis produced 4 to 8 inches of rain across the southeast parts of Lycoming County. Particularly hard hit was Montgomery where flooding was compared to Agnes in 1972. Major flooding hit around 3:00 a.m. EDT. Thirty homes were damaged and one bridge was out of service. Around 80 people were evacuated between 2:00 a.m. and 4:00 a.m., with a large number of residents abandoning their homes at the lower end of West Houston Avenue and Brook Street. Others left homes on Main Street and the campground. One person told of leaving his home, only to find his car had been overturned by the water.

5. Aug 17, 2007Hail$350,000
   National Weather Service narrative

   Public reported golf ball to baseball sized hail in Muncy (report relayed through trained storm spotter).

6. Mar 31, 2022Tornado$300,000
   National Weather Service narrative

   An EF1 tornado producing peak winds estimated between 85 to 95 mph tracked from northern Montour County into southeastern Lycoming County. The tornado touched down along Gearhart Road in northern Montour County, knocking down a tree and then causing damage to a barn along Muncy Exchange Road. The tornado continued northeastward into Lycoming County where it caused extensive tree damage along and east of Laidecker Road.|As the tornado moved further into Moreland Township, it knocked down hundreds of trees and damaged a silo roof, barn roof, and porch at various properties along Wallis Road. Dozens of trees were knocked down/snapped off along Moreland Township Road and Church Road…

7. Jun 22, 2024Thunderstorm Wind$160,000
   National Weather Service narrative

   A National Weather Service storm survey confirmed a downburst associated with a severe thunderstorm near the town of Hughesville. Peak wind gusts were estimated at 70 mph. Several hundred trees were damaged and at least 4 small greenhouses were crushed. Additionally, a few homes and businesses had their metal roofs ripped off along with several homes sustaining damage from fallen trees. Numerous power poles and lines were damaged or broken. Significant tree damage was observed at a local cemetery where dozens of gravestones were damaged. Some trees were missing nearly all of their branches and some branches were found penetrating 4 to 5 inches into the ground.

8. Sep 16, 1999High Wind, Southern Lycoming$100,000
9. Jul 9, 2015Tornado$100,000
   National Weather Service narrative

   A National Weather Service survey team concluded that an EF1 tornado touched down northeast of Montoursville on Quaker State Road. The tornado traveled east-northeastward for about 3/4 of a mile before lifting near the intersection of Clarence Fry Road and Simpler Hollow Road. Numerous trees were snapped or uprooted, and several outbuildings were damaged along Quaker State Road. Maximum wind speed was around 90 mph, classifying this as an EF1 tornado.

10. Nov 8, 1996Tornado$100,000
    National Weather Service narrative

    This storm was a continuation of damage that occurred in the Avis and Jersey Shore areas. The tornado caused intermittent damage along a 2.5 mile path in Woodward Township northwest of Linden. The tornado tore a brick facade off the southeast face of the Lycoming Christian Church at the initial touchdown northwest of Linden, then moved east northeast taking down trees in spots and doing minor damage to a couple of homes and a shed along the 2.5 mile path.

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

103°F3 times, most recently Jul 22, 2011

All-time low

−20°FJan 21, 1994

Warmest night

78°FJul 15, 1995

Coldest day

0°FJan 17, 1982

Wettest day

8.66 inJun 22, 1972

Snowiest day

20.0 inFeb 19, 1972

Hottest year

2024mean 54.3°F

Coldest year

1965mean 48.4°F

Wettest year

201170.26 in

Driest year

199730.08 in

Snowiest season

85.9 in1995-96

Station Williamsport Regional Airport (USW00014778), 524 ft elevation, 5.9 miles from the city centre. Daily records from 1948 to October 27, 2026; 100.0% 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.

Declarations for Lycoming County.

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.

• 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 USW00014778.
• 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.