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Flood in Sullivan County, New York
86 floods and flash floods events in the NCEI Storm Events record, 1950 to 2026. Event types counted: Flood, Flash Flood, Coastal Flood, Lakeshore Flood.
NCEI notes that Storm Data is compiled from a variety of sources including the National Weather Service, other federal, state and local agencies, the media and the public; that property and crop damage figures are estimates; and that some events are recorded by NWS forecast zone rather than by county. FEMA notes that NFIP claim records are redacted and aggregated to protect the privacy of policyholders. Storm records through 30 Jun 2026.
NCEI records 86 flood events in Sullivan County, New York, between 1950 and 2026, spread over 22 years.
July is the busiest month, with 16 of the recorded events. The last 20 years account for 53 events against 33 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 1.3% of the 6,836 flood events recorded in New York; its 8.9 per 100 square miles compares with 14.5 statewide.
NCEI attributes 2 deaths in the county to floods and flash floods.
Compared with New York
| Measure | Sullivan County | New York | US |
|---|---|---|---|
| Flood events since 1950 | 86 | 6,836 | 183,559 |
| Per 100 square miles | 8.9 | 14.5 | 5.2 |
| Per 10,000 residents | 10.8 | 3.4 | 5.5 |
| Deaths recorded | 2 | 117 | 2,961 |
| Busiest month | July | July | June |
By year
Seasonality
4Feb
0Mar
3Apr
4May
1Jun
9Jul
16Aug
15Sep
15Oct
11Nov
4Dec
4
Recorded events
All 86 events, most recent first. Magnitude is hail size, tornado rating or wind speed as recorded.
| Date | Event type | Magnitude | Property damage | Crop damage | Deaths | Injuries | Geography |
|---|---|---|---|---|---|---|---|
| 18 Dec 2023 | Flash Flood | — | $20K | — | — | — | County |
| 26 Oct 2021 | Flash Flood | — | $5K | — | — | — | County |
| 26 Oct 2021 | Flash Flood | — | $20K | — | — | — | County |
| 26 Oct 2021 | Flash Flood | — | $5K | — | — | — | County |
| 26 Oct 2021 | Flash Flood | — | $5K | — | — | — | County |
| 26 Oct 2021 | Flash Flood | — | $5K | — | — | — | County |
| 26 Oct 2021 | Flash Flood | — | $5K | — | — | — | County |
| 26 Oct 2021 | Flash Flood | — | $5K | — | — | — | County |
| 26 Oct 2021 | Flood | — | $1K | — | — | — | County |
| 1 Sep 2021 | Flash Flood | — | $3K | — | — | — | County |
| 1 Sep 2021 | Flash Flood | — | $3K | — | — | — | County |
| 1 Sep 2021 | Flash Flood | — | $3K | — | — | — | County |
| 1 Sep 2021 | Flash Flood | — | $5K | — | — | — | County |
| 4 Aug 2020 | Flash Flood | — | $10K | — | — | — | County |
| 3 Aug 2018 | Flash Flood | — | $10K | — | — | — | County |
| 25 Jul 2018 | Flash Flood | — | $15K | — | — | — | County |
| 12 Jan 2018 | Flood | — | — | — | — | — | County |
| 30 Oct 2017 | Flood | — | $50K | — | — | — | County |
| 3 Jul 2014 | Flash Flood | — | $50K | — | — | — | County |
| 3 Jul 2014 | Flash Flood | — | $100K | — | — | — | County |
| 2 Jul 2014 | Flash Flood | — | $250K | — | — | — | County |
| 2 Jul 2014 | Flash Flood | — | $10K | — | — | — | County |
| 2 Jul 2014 | Flash Flood | — | $20K | — | — | — | County |
| 2 Jul 2014 | Flash Flood | — | $50K | — | — | — | County |
| 30 Jun 2013 | Flash Flood | — | $5K | — | — | — | County |
| 30 Jun 2013 | Flash Flood | — | $5K | — | — | — | County |
| 30 Jun 2013 | Flash Flood | — | $5K | — | — | — | County |
| 18 Sep 2012 | Flash Flood | — | $40K | — | — | — | County |
| 18 Sep 2012 | Flash Flood | — | $50K | — | — | — | County |
| 29 Sep 2011 | Flash Flood | — | $10K | — | — | — | County |
| 29 Sep 2011 | Flood | — | $10K | — | — | — | County |
| 28 Sep 2011 | Flood | — | — | — | — | — | County |
| 8 Sep 2011 | Flood | — | $300K | — | — | — | County |
| 28 Aug 2011 | Flood | — | $50K | — | — | — | County |
| 28 Aug 2011 | Flash Flood | — | $500K | — | — | — | County |
| 28 Aug 2011 | Flash Flood | — | $500K | — | — | — | County |
| 28 Aug 2011 | Flash Flood | — | $1.0M | — | — | — | County |
| 28 Aug 2011 | Flash Flood | — | $200K | — | — | — | County |
| 11 Mar 2011 | Flash Flood | — | $75K | — | — | — | County |
| 1 Oct 2010 | Flash Flood | — | $10K | — | 1 | — | County |
| 8 Jul 2010 | Flash Flood | — | $15K | — | — | — | County |
| 10 Aug 2009 | Flash Flood | — | $2K | — | — | — | County |
| 9 Aug 2009 | Flash Flood | — | $5K | — | — | — | County |
| 2 Aug 2009 | Flash Flood | — | $5K | — | — | — | County |
| 31 Jul 2009 | Flash Flood | — | $20K | — | — | — | County |
| 30 Jul 2009 | Flash Flood | — | — | — | — | — | County |
| 30 Jul 2009 | Flash Flood | — | — | — | — | — | County |
| 30 Jul 2009 | Flash Flood | — | — | — | — | — | County |
| 24 Jul 2008 | Flash Flood | — | $5K | — | — | — | County |
| 23 Jul 2008 | Flash Flood | — | $15M | — | — | — | County |
| 8 Mar 2008 | Flood | — | — | — | — | — | County |
| 19 Jun 2007 | Flash Flood | — | $300K | — | — | — | County |
| 16 Apr 2007 | Flood | — | — | — | — | — | County |
| 16 Nov 2006 | Flash Flood | — | $5K | — | — | — | County |
| 27 Jun 2006 | Flood | — | — | — | — | — | County |
| 27 Jun 2006 | Flood | — | — | — | — | — | County |
| 27 Jun 2006 | Flash Flood | — | $100M | — | 1 | — | County |
| 26 Jun 2006 | Flash Flood | — | $25K | — | — | — | County |
| 30 Nov 2005 | Flood | — | $5K | — | — | — | Forecast zone |
| 8 Oct 2005 | Flash Flood | — | $50K | — | — | — | County |
| 2 Apr 2005 | Flash Flood | — | $10M | — | — | — | County |
| 2 Apr 2005 | Flood | — | $1.0M | — | — | — | Forecast zone |
| 2 Apr 2005 | Flood | — | $1.0M | — | — | — | Forecast zone |
| 29 Mar 2005 | Flash Flood | — | $10K | — | — | — | County |
| 18 Sep 2004 | Flood | — | $1.0M | — | — | — | Forecast zone |
| 18 Sep 2004 | Flash Flood | — | $15M | — | — | — | County |
| 18 Sep 2004 | Flood | — | $2.0M | — | — | — | Forecast zone |
| 30 Aug 2004 | Flash Flood | — | $20M | — | — | — | County |
| 12 Aug 2004 | Flash Flood | — | $500K | — | — | — | County |
| 12 Aug 2004 | Flash Flood | — | $20K | — | — | — | County |
| 23 Jul 2004 | Flash Flood | — | $50K | — | — | — | County |
| 4 Sep 2003 | Flash Flood | — | $500K | — | — | — | County |
| 28 May 2002 | Flash Flood | — | $50K | — | — | — | County |
| 17 Dec 2000 | Flash Flood | — | $1.0M | — | — | — | County |
| 12 Aug 2000 | Flash Flood | — | $1.3M | — | — | — | County |
| 11 Aug 2000 | Flash Flood | — | — | — | — | — | County |
| 14 Jul 2000 | Flash Flood | — | — | — | — | — | County |
| 16 Sep 1999 | Flash Flood | — | — | — | — | — | County |
| 30 Jun 1998 | Flash Flood | — | — | — | — | — | County |
| 2 Dec 1996 | Flash Flood | — | $10K | — | — | — | County |
| 1 Dec 1996 | Flood | — | — | — | — | — | Forecast zone |
| 9 Nov 1996 | Flood | — | — | — | — | — | Forecast zone |
| 9 Nov 1996 | Flash Flood | — | $50K | — | — | — | County |
| 27 Jan 1996 | Flash Flood | — | — | — | — | — | County |
| 19 Jan 1996 | Flash Flood | — | $8.7M | — | — | — | County |
| 19 Jan 1996 | Flood | — | — | — | — | — | Forecast zone |
Questions and answers
How many flood events has Sullivan County had?
86 events in the NCEI Storm Events record between 1950 and 2026. Reporting of floods and flash floods became far more complete after 1996, so early decades undercount.
When was the last recorded flood event in Sullivan County?
18 Dec 2023 (Flash Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Sullivan County?
The flash flood of 27 Jun 2006, with property damage estimated by NCEI at $100M; 1 death recorded.
How does Sullivan County compare with New York for flood?
8.9 events per 100 square miles against 14.5 statewide; the county holds 86 of the state's 6,836 recorded events.
Provenance
NOAA NCEI Storm Events Database, yearly details files through 30 Jun 2026, public domain. County-recorded events plus zone-recorded events whose forecast zone is named for the county (marked "Forecast zone"). Population and area from the US Census Bureau (2021). Built 1 Oct 2026. See the methodology, the Flood hub and the county page.