Alert archive / New York / Flash Flood Warnings
Flash Flood Warnings in New York, 2024
98 flash flood warnings in 2024. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of flash flood warnings reaches back to 1986.
Flash Flood Warnings by county
Each county as a circle sized by its count in 2024. Tap one for its archive.
- Flash Flood Warnings
- 98
- Busiest month
- August50 flash flood warnings
- Busiest day
- August 9, 202418 flash flood warnings
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
64 of 98 flash flood warnings covering New York in 2024 had a flash flood report inside them; 219 of 236 flash flood reports fell inside a warning, on average 103 minutes after it went out.
New York, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Flash flood warnings | 98 | 64 | 35% | 236 | 93% | 103 min |
Each office's whole area, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Albany, NY: flash flood warnings | 10 | 7 | 30% | 22 | 100% | 78 min |
| NWS Burlington, VT: flash flood warnings | 22 | 17 | 23% | 89 | 93% | 261 min |
| NWS New York, NY: flash flood warnings | 29 | 18 | 38% | 145 | 90% | 108 min |
| NWS Binghamton, NY: flash flood warnings | 58 | 31 | 47% | 127 | 91% | 109 min |
| NWS Buffalo, NY: flash flood warnings | 22 | 17 | 23% | 52 | 100% | 78 min |
An office's figures cover every county it serves, including across state lines.
Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.
The alerts
Every alert, in the order issued. Times are local, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 9, 10:56 PM EST | Flash Flood Warning | OKX | Nassau | 3 hr |
| Apr 30, 4:54 PM EDT | Flash Flood Warning | BGM | Chenango, Otsego | 111 min |
| Jun 18, 8:39 AM EDT | Flash Flood Warning | BUF | Niagara | 3 hr |
| Jun 19, 10:45 PM EDT | Flash Flood Warning | BUF | Cattaraugus | 4 hr |
| Jun 19, 10:49 PM EDT | Flash Flood Warning | BUF | Livingston | 4 hr |
| Jun 19, 11:03 PM EDT | Flash Flood Warning | BUF | Allegany | 4 hr |
| Jun 19, 11:50 PM EDT | Flash Flood Warning | BUF | Ontario | 3 hr |
| Jun 20, 1:22 AM EDT | Flash Flood Warning | BGM | Seneca | 113 min |
| Jun 20, 1:24 PM EDT | Flash Flood Warning | BGM | Steuben | 2 hr |
| Jun 20, 2:40 PM EDT | Flash Flood Warning | BGM | Steuben | 76 min |
| Jun 20, 3:51 PM EDT | Flash Flood Warning | BGM | Chenango, Cortland | 2 hr |
| Jun 30, 2:41 PM EDT | Flash Flood Warning | OKX | Putnam, Westchester | 3 hr |
| Jun 30, 5:07 PM EDT | Flash Flood Warning | OKX | Kings, New York, Queens, Richmond | 3 hr |
| Jul 4, 6:59 PM EDT | Flash Flood Warning | BGM | Broome, Delaware | 2 hr |
| Jul 10, 3:06 PM EDT | Flash Flood Warning | BUF | Lewis | 7 hr |
| Jul 10, 3:50 PM EDT | Flash Flood Warning | BTV | Essex, Franklin | 15 hr |
| Jul 10, 5:56 PM EDT | Flash Flood Warning | BTV | Essex | 13 hr |
| Jul 10, 6:32 PM EDT | Flash Flood Warning | ALY | Hamilton, Herkimer | 3 hr |
| Jul 10, 6:55 PM EDT | Flash Flood Warning | BGM | Onondaga | 2 hr |
| Jul 10, 7:57 PM EDT | Flash Flood Warning | BGM | Chenango | 4 hr |
| Jul 10, 8:29 PM EDT | Flash Flood Warning | BGM | Oneida | 117 min |
| Jul 10, 10:03 PM EDT | Flash Flood Warning | BTV | Clinton, Essex | 6 hr |
| Jul 10, 10:18 PM EDT | Flash Flood Warning | BTV | Clinton, Essex, Franklin | 6 hr |
| Jul 15, 4:07 PM EDT | Flash Flood Warning | BUF | Erie, Genesee, Wyoming | 4 hr |
| Jul 15, 4:55 PM EDT | Flash Flood Warning | BUF | Genesee, Livingston, Monroe, Ontario, Wyoming | 4 hr |
| Jul 15, 7:52 PM EDT | Flash Flood Warning | BGM | Cayuga, Cortland, Onondaga, Seneca | 2 hr |
| Jul 16, 3:31 PM EDT | Flash Flood Warning | BUF | Lewis | 2 hr |
| Jul 17, 10:10 PM EDT | Flash Flood Warning | OKX | Kings, Nassau, New York, Queens | 57 min |
| Jul 22, 5:30 PM EDT | Flash Flood Warning | BGM | Steuben | 3 hr |
| Jul 22, 6:38 PM EDT | Flash Flood Warning | BGM | Steuben | 92 min |
| Jul 24, 12:55 PM EDT | Flash Flood Warning | BGM | Oneida | 118 min |
| Jul 24, 4:18 PM EDT | Flash Flood Warning | BGM | Sullivan | 2 hr |
| Jul 24, 4:49 PM EDT | Flash Flood Warning | BGM | Cortland, Tioga, Tompkins | 4 hr |
| Jul 24, 4:59 PM EDT | Flash Flood Warning | BGM | Sullivan | 3 hr |
| Jul 24, 5:09 PM EDT | Flash Flood Warning | BUF | Jefferson, Lewis, Oswego | 3 hr |
| Jul 24, 8:12 PM EDT | Flash Flood Warning | BGM | Broome, Chenango, Cortland | 3 hr |
| Jul 24, 8:40 PM EDT | Flash Flood Warning | BGM | Delaware, Otsego | 3 hr |
| Jul 24, 8:47 PM EDT | Flash Flood Warning | BGM | Broome, Chenango, Tioga | 3 hr |
| Jul 24, 9:21 PM EDT | Flash Flood Warning | BGM | Broome, Chenango | 4 hr |
| Jul 24, 10:10 PM EDT | Flash Flood Warning | BGM | Broome | 4 hr |
| Jul 24, 10:52 PM EDT | Flash Flood Warning | BGM | Delaware | 3 hr |
| Jul 29, 2:38 PM EDT | Flash Flood Warning | OKX | Nassau, Suffolk | 111 min |
| Aug 2, 3:36 PM EDT | Flash Flood Warning | BGM | Steuben | 114 min |
| Aug 2, 4:24 PM EDT | Flash Flood Warning | BGM | Steuben | 3 hr |
| Aug 2, 4:46 PM EDT | Flash Flood Warning | BUF | Allegany, Cattaraugus | 2 hr |
| Aug 3, 3:23 PM EDT | Flash Flood Warning | BGM | Sullivan | 3 hr |
| Aug 3, 3:46 PM EDT | Flash Flood Warning | OKX | Rockland, Westchester | 119 min |
| Aug 3, 4:45 PM EDT | Flash Flood Warning | OKX | Westchester | 95 min |
| Aug 3, 5:31 PM EDT | Flash Flood Warning | OKX | Bronx, New York, Queens, Westchester | 119 min |
| Aug 5, 1:35 PM EDT | Flash Flood Warning | BUF | Erie | 2 hr |
| Aug 5, 3:42 PM EDT | Flash Flood Warning | BUF | Erie, Genesee | 4 hr |
| Aug 5, 5:03 PM EDT | Flash Flood Warning | BGM | Chemung, Tioga | 68 min |
| Aug 5, 5:26 PM EDT | Flash Flood Warning | BGM | Broome, Tioga | 3 hr |
| Aug 5, 6:10 PM EDT | Flash Flood Warning | BGM | Tioga | 3 hr |
| Aug 5, 8:26 PM EDT | Flash Flood Warning | BGM | Madison, Oneida | 3 hr |
| Aug 6, 12:18 PM EDT | Flash Flood Warning | OKX | Suffolk | 72 min |
| Aug 6, 2:43 PM EDT | Flash Flood Warning | OKX | Suffolk | 75 min |
| Aug 6, 4:58 PM EDT | Flash Flood Warning | OKX | Bronx, Nassau, New York, Westchester | 5 hr |
| Aug 6, 6:40 PM EDT | Flash Flood Warning | OKX | Nassau, Suffolk | 3 hr |
| Aug 9, 7:52 AM EDT | Flash Flood Warning | BGM | Broome | 8 hr |
| Aug 9, 9:29 AM EDT | Flash Flood Warning | BGM | Chemung, Schuyler, Steuben, Yates | 6 hr |
| Aug 9, 10:09 AM EDT | Flash Flood Warning | ALY | Greene, Ulster | 3 hr |
| Aug 9, 11:13 AM EDT | Flash Flood Warning | BGM | Broome, Chenango, Cortland | 4 hr |
| Aug 9, 11:14 AM EDT | Flash Flood Warning | BUF | Allegany | 6 hr |
| Aug 9, 12:08 PM EDT | Flash Flood Warning | BGM | Steuben | 6 hr |
| Aug 9, 12:22 PM EDT | Flash Flood Warning | BUF | Ontario | 4 hr |
| Aug 9, 12:28 PM EDT | Flash Flood Warning | BGM | Broome, Cayuga, Chemung, Schuyler, Seneca, Tioga and 1 more | 6 hr |
| Aug 9, 1:33 PM EDT | Flash Flood Warning | BGM | Broome, Chenango, Delaware, Otsego | 4 hr |
| Aug 9, 1:41 PM EDT | Flash Flood Warning | BUF | Cayuga, Ontario, Oswego, Wayne | 4 hr |
| Aug 9, 2:49 PM EDT | Flash Flood Warning | BGM | Delaware, Otsego, Sullivan | 3 hr |
| Aug 9, 2:51 PM EDT | Flash Flood Warning | BUF | Jefferson, Oswego | 4 hr |
| Aug 9, 3:02 PM EDT | Flash Flood Warning | ALY | Albany, Greene, Schoharie, Ulster | 3 hr |
| Aug 9, 3:49 PM EDT | Flash Flood Warning | ALY | Albany, Montgomery, Rensselaer, Saratoga, Schenectady, Schoharie | 3 hr |
| Aug 9, 4:48 PM EDT | Flash Flood Warning | BTV | St. Lawrence | 4 hr |
| Aug 9, 5:07 PM EDT | Flash Flood Warning | BTV | Franklin, St. Lawrence | 4 hr |
| Aug 9, 5:23 PM EDT | Flash Flood Warning | ALY | Rensselaer, Washington | 2 hr |
| Aug 9, 6:09 PM EDT | Flash Flood Warning | BTV | Franklin, St. Lawrence | 3 hr |
| Aug 15, 3:18 PM EDT | Flash Flood Warning | BGM | Oneida | 117 min |
| Aug 18, 9:26 AM EDT | Flash Flood Warning | OKX | Westchester | 6 hr |
| Aug 18, 2:26 PM EDT | Flash Flood Warning | BGM | Chenango, Madison, Oneida | 5 hr |
| Aug 18, 5:37 PM EDT | Flash Flood Warning | BGM | Broome | 3 hr |
| Aug 18, 5:46 PM EDT | Flash Flood Warning | OKX | Orange, Putnam, Rockland, Westchester | 3 hr |
| Aug 18, 6:38 PM EDT | Flash Flood Warning | OKX | Rockland | 3 hr |
| Aug 18, 6:43 PM EDT | Flash Flood Warning | BGM | Oneida | 5 hr |
| Aug 18, 7:17 PM EDT | Flash Flood Warning | OKX | Bronx, New York, Richmond, Rockland, Westchester | 3 hr |
| Aug 18, 9:53 PM EDT | Flash Flood Warning | OKX | Nassau, Suffolk | 3 hr |
| Aug 18, 11:03 PM EDT | Flash Flood Warning | OKX | Suffolk | 3 hr |
| Aug 18, 11:59 PM EDT | Flash Flood Warning | OKX | Suffolk | 7 hr |
| Aug 19, 12:10 AM EDT | Flash Flood Warning | OKX | Nassau, Suffolk | 3 hr |
| Aug 19, 1:20 AM EDT | Flash Flood Warning | OKX | Suffolk | 3 hr |
| Aug 19, 3:04 PM EDT | Flash Flood Warning | ALY | Albany, Schenectady | 2 hr |
| Aug 19, 3:35 PM EDT | Flash Flood Warning | OKX | Suffolk | 82 min |
| Aug 31, 8:16 PM EDT | Flash Flood Warning | BGM | Chemung, Steuben | 85 min |
| Sep 6, 9:43 PM EDT | Flash Flood Warning | BUF | Cattaraugus | 2 hr |
| Sep 9, 5:05 PM EDT | Flash Flood Warning | BUF | Monroe, Wayne | 4 hr |
| Sep 21, 4:50 PM EDT | Flash Flood Warning | BUF | Allegany | 4 hr |
| Sep 21, 6:18 PM EDT | Flash Flood Warning | BUF | Allegany | 2 hr |
| Sep 21, 7:27 PM EDT | Flash Flood Warning | BUF | Allegany | 4 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Broome County11
- Suffolk County10
- Chenango County9
- Steuben County9
- Westchester County8
- Nassau County7
- Allegany County6
- Oneida County6
- Tioga County6
- Cortland County5
- New York County5
- Delaware County5
- Otsego County4
- Ontario County4
- Essex County4
- Franklin County4
- Sullivan County4
- Rockland County4
- Chemung County4
- Cattaraugus County3
- Seneca County3
- Queens County3
- Lewis County3
- Erie County3
- Genesee County3
- Cayuga County3
- Oswego County3
- Bronx County3
- Albany County3
- St. Lawrence County3
- Livingston County2
- Putnam County2
- Kings County2
- Richmond County2
- Onondaga County2
- Clinton County2
- Wyoming County2
- Monroe County2
- Tompkins County2
- Jefferson County2
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20232025
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.