Allegany County, New York severe weather history spans 451 recorded events between 1956 and 2026. The dominant hazard is thunderstorm wind, accounting for 66.3% of all recorded events. It ranks #1,060 nationally and #31 in New York.
451
Recorded events
0
Direct deaths
38
Direct injuries
$20.2M
Property damage
The record
What the Allegany County, New York severe weather history record shows
Across the archive, Allegany County, New York severe weather history averages 6.4 recorded events a year. The busiest stretch on record is the 2010s, with 174 events logged in that decade alone. Roughly 28 events fall before 1990 and 423 from 1990 onward — a gap that reflects the expansion of NOAA reporting practice as much as the weather itself.
The costliest is flash flood, with $15.1M in reported property damage. In total, 7 distinct hazard types appear in this county archive, each listed with its own dated record below.
By hazard type
Every hazard type recorded in Allegany County
| Hazard | Events | Deaths | Damage | Max | Span |
|---|---|---|---|---|---|
| Thunderstorm Wind | 299 | 0 | $2.9M | 80 | 1956–2026 |
| Flash Flood | 90 | 0 | $15.1M | 0 | 1996–2026 |
| Hail | 31 | 0 | $85K | 1.75 | 1956–2026 |
| Tornado | 11 | 0 | $1.6M | F2 | 1993–2024 |
| Flood | 10 | 0 | $446K | 0 | 2007–2021 |
| Heavy Rain | 7 | 0 | $0 | 0 | 2021–2021 |
| Lightning | 3 | 0 | $55K | 0 | 2006–2018 |
Decade by decade
Allegany County, New York severe weather history by decade
Reporting practice changed over time — early decades are undercounted, not calmer.
Tornado tracks
Paths crossing this county
12 mapped tornado paths intersect this county: 11 touched down inside it and 1 crossed in from a neighbouring county. This comes from path geometry, not county-tagged reports.
| Date | Scale | Deaths | Injuries | Path length | Origin |
|---|---|---|---|---|---|
| 1969-06-20 | EF3 | 0 | 0 | 84.1 mi | Crossed in |
| 2002-04-28 | EF2 | 0 | 0 | 6.5 mi | Touched down here |
| 1993-09-03 | EF2 | 0 | 0 | 3.5 mi | Touched down here |
| 2024-09-06 | EF1 | 0 | 0 | 6.0 mi | Touched down here |
| 2017-07-20 | EF1 | 0 | 0 | 4.2 mi | Touched down here |
| 2010-06-27 | EF1 | 0 | 0 | 7.4 mi | Touched down here |
| 2009-08-09 | EF1 | 0 | 0 | 7.8 mi | Touched down here |
| 2002-08-22 | EF1 | 0 | 0 | 4.0 mi | Touched down here |
| 2017-07-20 | EF0 | 0 | 0 | 1.1 mi | Touched down here |
| 2005-08-12 | EF0 | 0 | 0 | 0.5 mi | Touched down here |
Significant events
Deadliest events on record in Allegany County
| Date | Type | Location | Deaths | Injuries | Damage |
|---|---|---|---|---|---|
| Nov 15, 2011 | Thunderstorm Wind | KOSSUTH | 0 | 15 | $0 |
| Jun 12, 2012 | Flash Flood | RICHBURG | 0 | 10 | $0 |
| Nov 15, 2011 | Thunderstorm Wind | FRIENDSHIP | 0 | 10 | $0 |
| Jul 4, 2018 | Lightning | BELMONT | 0 | 1 | $0 |
| Jun 22, 2001 | Thunderstorm Wind | BELFAST | 0 | 1 | $20K |
| Jun 12, 2001 | Thunderstorm Wind | BELFAST | 0 | 1 | $50K |
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
The tornado first touched down and uprooted or snapped a number of large trees. A large annex to a barn disintegrated as the tornado passed by. The debris was scattered downwind across a field. A pickup truck was moved about 75 feet down a road and tossed into a pole. The tornado then crossed a field and uprooted a few large trees that all fell in roughly the same direction. A nearby house sustained significant structural damage and the entire structure was shifted slightly off its foundation. The tornado crossed a field and a stand of large trees. Many of the trees were knocked down in a very "chopped up" pattern.
An isolated thunderstorm produced damaging winds that downed a 75 foot pine tree. The tree fell onto a house resulting in structural damage to the roof and second story. An outdoor gazebo was also flattened by the tree.
Thunderstorms produced high winds and torrential rains during the afternoon and evening hours. The strong thunderstorm winds downed trees and power lines. Scattered power outages were reported. The torrential rains caused some poor drainage flooding. In Olean, underpasses were flooded with waist-deep water.
Context
Risk, population and federal disasters
Relatively Low
FEMA NRI risk rating
47,159
Population (ACS)
$102K
Median home value
25
Federal declarations
| Declared | Incident | Title | Type |
|---|---|---|---|
| Sep 24, 2024 | Tropical Storm | REMNANTS OF TROPICAL STORM DEBBY | DR |
| Oct 8, 2021 | Hurricane | REMNANTS OF TROPICAL STORM FRED | DR |
| Mar 20, 2020 | Biological | COVID-19 PANDEMIC | DR |
| Mar 13, 2020 | Biological | COVID-19 | EM |
| Jul 8, 2014 | Severe Storm | SEVERE STORMS AND FLOODING | DR |
| Jul 12, 2013 | Flood | SEVERE STORMS AND FLOODING | DR |
Quick answers
Frequently asked
How many severe weather events have been recorded in Allegany County, New York?
451 events are on record between 1956 and 2026, causing 0 direct deaths and $20.2M in property damage.
What is the most common severe weather hazard in Allegany County?
Thunderstorm Wind, with 299 recorded events — 66.3% of everything in the archive for this county.
How many tornadoes have crossed Allegany County?
12 mapped tornado paths intersect the county boundary; 11 of them touched down inside it. This is derived from path geometry, not county-tagged reports.
How many federal disaster declarations cover Allegany County?
25 federal disaster declarations from FEMA include Allegany County, each tied to a specific incident period.
How risky is Allegany County compared with the rest of the country?
FEMA's National Risk Index rates Allegany County as relatively low risk, placing it in the 70 percentile of its state for expected annual loss.
Where does the Allegany County, New York severe weather history data come from?
Every figure is drawn from United States federal public-domain records: NOAA/NCEI Storm Events for the event archive, NOAA SPC SVRGIS for mapped tornado paths, FEMA for disaster declarations and risk ratings, and the U.S. Census for population context. Dates are shown in UTC and recent entries may still be revised by NOAA.
Nearby
Neighbouring counties
- Albany County 928
- Bronx County 151
- Broome County 1,069
- Cattaraugus County 684
- Cayuga County 526
- Chautauqua County 785
Cite this page
“Allegany County, New York.” Severe Weather History. severeweatherhistory.com/county/new-york/allegany-county/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.