Sullivan County

Every recorded tornado

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

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 USGS Conterminous (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. Jun 27, 2006Flash Flood$100 million
   National Weather Service narrative

   Tropical moisture continued to stream northward into the Catskills ahead of a frontal system which slowly moved westward into the eastern Great Lakes by Tuesday morning the 27th. This tropical moisture developed a batch of heavy showers and thunderstorms from eastern Pennsylvania into the Catskills late Monday evening the 26th through Tuesday morning the 27th. By 8 am Tuesday, another 3 to 5 inches of rain fell across northern Sullivan County which caused major flash flooding. Additional rain fell Tuesday afternoon into Wednesday morning as the front moved back east and combined with a low pressure system moving up the eastern seaboard. The additional rainfall brought rainfall…

2. Aug 30, 2004Flash Flood$20.0 million
   National Weather Service narrative

   Heavy rain caused flash flooding. Numerous roads were flooded. Reports of power poles being washed out of the ground. One residence was undermined enough to partially collapse. Evacuations took place. Rainfall amounts were 1 to 4 inches.

3. Sep 18, 2004Flash Flood$15.0 million
   National Weather Service narrative

   Heavy rain with amounts of 3 to 6 inches caused flash flooding. The heaviest amounts were at the highest elevations in the northwest section of the county. The rain which fell from the 16th to the 18th was due to the remnants of hurricane Ivan. Most streams and creeks went out of their banks. In addition, the Delaware River had major flooding. 300 homes and at least a dozen businesses had damage. Several campgrounds were completely wiped out. Livingston Manor was completely flooded. Across the county 1200 people were evacuated. 10 people were rescued in Roscoe and 19 in Callicoon.

4. Jul 23, 2008Flash Flood$15.0 million
   National Weather Service narrative

   Heavy rain from thunderstorms caused significant flash flooding. All roads in the towns of Colchester were closed, and a State of Emergency was declared. 15-20 residents were evacuated near County Highway 7. Serious damage occurred to a bridge on the highway. Portions of the road on Holiday and Berry Brook were completely washed out, and one rescue took place from a car. Flooding also occurred along Route 206 from Rockland to Route 30. Highway 17 west of Roscoe, Old Route 17 near Roscoe and Route 17 eastbound east of Roscoe were all closed due to washouts of portions of the highway. Water surrounded a home in Jeffersonville.

5. Apr 2, 2005Flash Flood$10.0 million
   National Weather Service narrative

   A slow moving storm from the Ohio Valley brought 2 to 4 inches of rain on April 2nd and 3rd. Before this storm, the rivers and streams had high flows due to a previous rainstorm March 28th and snowmelt. The hardest hit areas due to the flash flooding were Livingston Manor, Roscoe, and Jeffersonville, but all towns were affected. All streams and creeks flooded. Buildings, roads, and bridges damaged.

6. Jan 19, 1996Flash Flood$8.7 million
7. Sep 18, 2004Flood, Sullivan$2.0 million
   National Weather Service narrative

   The Delaware River at Barryville went above its flood stage of 17 feet the morning of the 18th, crested at 24.1 feet at 3:15 PM EST on the 18th, then fell back below the flood stage late morning on the 19th. Rainfall amounts were 4 to 7 inches due to the remnants of hurricane Ivan. The rain fell from the 16th to the 18th. This was the second highest crest on record at Barryville. The highest crest was in 1955.

8. Aug 12, 2000Flash Flood$1.3 million
   National Weather Service narrative

   Persistent rains associated with a nearly stationary upper level low pressure system produced a prolonged period of very heavy rain across Sullivan county. Extensive flooding was reported in Cochecton, Delaware, and Tusten where a State of Emergency was declared because of numerous road and bridge washouts. One stone bridge at Ten Mile River, constructed in 1895, was destroyed as were other bridges built above the 100 year flood level. A portion of County Route 23 half a mile long was completely washed out. Rainfall reports of 8 to 10 inches were recieved from the area.

9. Oct 29, 2012High Wind, Sullivan$1.0 million
   National Weather Service narrative

   High winds developed during the afternoon hours on Monday 29th and lasted into early morning hours on Tuesday the 30th from Hurricane Sandy. The high winds knocked downed numerous trees and power lines county-wide. Many of the trees were blocking roads hampering efforts to restore power. Peak sustained winds were estimated between 40 and 50 with peak wind gusts estimated at 80 mph mainly over the southernt part of the county. During the height of the storm late in the evening, there were an estimated 43,000 customers without power. It took up to a week for power to be fully restored across the the county.

10. Aug 28, 2011Flash Flood$1.0 million
    National Weather Service narrative

    Catastrophic flash flooding occurred in Claryville. Route 19 was completely covered with water. Numerous mud slides were reported. Many residents reported this as historic flooding, the worse they have ever seen. Fifty homes were flooded.

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

99°F2 times, most recently Jul 8, 1988

All-time low

−26°FFeb 9, 1963

Warmest night

75°F3 times, most recently Jul 3, 2026

Coldest day

−10°FJan 13, 1914

Wettest day

5.42 inAug 5, 2020

Snowiest day

32.0 inFeb 16, 1958

Hottest year

1949mean 49.4°F

Coldest year

1904mean 41.6°F

Wettest year

195565.70 in

Driest year

190435.91 in

Snowiest season

138.0 in1960-61

Station Liberty 1 Ne (USC00304731), 1,580 ft elevation, 7.4 miles from the population centre. Daily records from 1898 to September 30, 2026; 92.3% 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 USC00304731.
• 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.