Thunderstorm Wind, Oneida
- When
- July 4, 2:00 AM EST
- Where
- Oneida County, Countywide
- Property damage
- $10,000
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 43.280, -75.420
Several trees and powerlines blown down
Flash Flooding and Damaging Winds in New York, July 4, 1999
An organized area of thunderstorms developed over the northern Great Lakes in association with an upper level disturbance and warm front. The thunderstorms moved southeast into a warm, humid and unstable airmass, entering the southern Tug Hill Plateau and western Mohawk Valley after midnight.
Where it happened
Every event with a place to put it; 3 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- $4.1 million
- Crop damage
- $500,000
- Events
- 6
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
What happened
The episode as NWS BGM wrote it up.
An organized area of thunderstorms developed over the northern Great Lakes in association with an upper level disturbance and warm front. The thunderstorms moved southeast into a warm, humid and unstable airmass, entering the southern Tug Hill Plateau and western Mohawk Valley after midnight. The thunderstorms produced strong winds and heavy rain. Across Oneida, eastern Otsego and eastern Delaware counties numerous roads were washed out. Many streams and creeks rose out of their banks flooding countless basements across these counties. There was also extensive structural damage to bridges and buildings. A state of emergency was declared for Oneida county and the towns of Roxbury and Stamford in Delaware county. A rain spotter in Roxbury reported 3.84 inches of rain in just two hours. Flood waters washed out part of the Adirondack Scenic Railway line in Holland Patent.
The radar
The Ft Drum radar (KTYX), 57 km away, was scanning. The volume nearest the first event began at 06:58 UTC.
Event by event
3 thunderstorm wind, 3 flash flood. Local standard time, as filed.
Thunderstorm Wind, Madison
- When
- July 4, 2:15 AM EST
- Where
- Madison County, Cazenovia
- Property damage
- $5,000
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 42.930, -75.820
Several trees and powerlines blown down
Flash Flood, Oneida
- When
- July 4, 5:41 AM EST to 7:30 AM EST
- Where
- Oneida County, Countywide
- Property damage
- $2.5 million
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 43.242, -75.436 (the zone’s center; the record gives no point)
Thunderstorm Wind, Otsego
- When
- July 4, 6:41 AM EST
- Where
- Otsego County, Laurens
- Measured
- 50 kt (58 mph)
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 42.530, -75.100
Flash Flood, Otsego
- When
- July 4, 6:57 AM EST
- Where
- Otsego County, East Portion
- Property damage
- $75,000
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 42.634, -75.033 (the zone’s center; the record gives no point)
Flash Flood, Delaware
- When
- July 4, 8:10 AM EST to 9:10 AM EST
- Where
- Delaware County, East Portion
- Property damage
- $1.5 million
- Crop damage
- $500,000
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 42.198, -74.966 (the zone’s center; the record gives no point)
What these are
- Thunderstorm Wind
- Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
- Flash Flood
- Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Heat in Pennsylvania, July 4 to 6, 1999
- Heat in New York, July 4 to 6, 1999
- Heat in Maryland, July 4 to 7, 1999
- Heat in New Jersey, July 4 to 6, 1999
- Heat in New Jersey, July 4 to 6, 1999
- Heat in District of Columbia, July 4 to 7, 1999
- Heat in Virginia, July 4 to 7, 1999
- Heat in Delaware, July 4 to 6, 1999
- Heat in Michigan, July 4 to 5, 1999
- Flood and Hail in North Dakota, July 4, 1999
- Flash Flooding and Hail in Michigan, July 4 to 31, 1999
- Rip Current in Alabama, July 4, 1999
More
Every storm in New York in 1999Every state in 1999This day in weather historyWarnings in New York, July 1999
Sources
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-30. Each event’s entry at NCEI: 5712766, 5712767, 5712769, 5712768, 5712770, 5712771.