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

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Flash flood warnings986435%23693%103 min

Each office's whole area, 2024

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Albany, NY: flash flood warnings10730%22100%78 min
NWS Burlington, VT: flash flood warnings221723%8993%261 min
NWS New York, NY: flash flood warnings291838%14590%108 min
NWS Binghamton, NY: flash flood warnings583147%12791%109 min
NWS Buffalo, NY: flash flood warnings221723%52100%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.

IssuedProductOfficeCountiesLasted
Jan 9, 10:56 PM ESTFlash Flood WarningOKXNassau3 hr
Apr 30, 4:54 PM EDTFlash Flood WarningBGMChenango, Otsego111 min
Jun 18, 8:39 AM EDTFlash Flood WarningBUFNiagara3 hr
Jun 19, 10:45 PM EDTFlash Flood WarningBUFCattaraugus4 hr
Jun 19, 10:49 PM EDTFlash Flood WarningBUFLivingston4 hr
Jun 19, 11:03 PM EDTFlash Flood WarningBUFAllegany4 hr
Jun 19, 11:50 PM EDTFlash Flood WarningBUFOntario3 hr
Jun 20, 1:22 AM EDTFlash Flood WarningBGMSeneca113 min
Jun 20, 1:24 PM EDTFlash Flood WarningBGMSteuben2 hr
Jun 20, 2:40 PM EDTFlash Flood WarningBGMSteuben76 min
Jun 20, 3:51 PM EDTFlash Flood WarningBGMChenango, Cortland2 hr
Jun 30, 2:41 PM EDTFlash Flood WarningOKXPutnam, Westchester3 hr
Jun 30, 5:07 PM EDTFlash Flood WarningOKXKings, New York, Queens, Richmond3 hr
Jul 4, 6:59 PM EDTFlash Flood WarningBGMBroome, Delaware2 hr
Jul 10, 3:06 PM EDTFlash Flood WarningBUFLewis7 hr
Jul 10, 3:50 PM EDTFlash Flood WarningBTVEssex, Franklin15 hr
Jul 10, 5:56 PM EDTFlash Flood WarningBTVEssex13 hr
Jul 10, 6:32 PM EDTFlash Flood WarningALYHamilton, Herkimer3 hr
Jul 10, 6:55 PM EDTFlash Flood WarningBGMOnondaga2 hr
Jul 10, 7:57 PM EDTFlash Flood WarningBGMChenango4 hr
Jul 10, 8:29 PM EDTFlash Flood WarningBGMOneida117 min
Jul 10, 10:03 PM EDTFlash Flood WarningBTVClinton, Essex6 hr
Jul 10, 10:18 PM EDTFlash Flood WarningBTVClinton, Essex, Franklin6 hr
Jul 15, 4:07 PM EDTFlash Flood WarningBUFErie, Genesee, Wyoming4 hr
Jul 15, 4:55 PM EDTFlash Flood WarningBUFGenesee, Livingston, Monroe, Ontario, Wyoming4 hr
Jul 15, 7:52 PM EDTFlash Flood WarningBGMCayuga, Cortland, Onondaga, Seneca2 hr
Jul 16, 3:31 PM EDTFlash Flood WarningBUFLewis2 hr
Jul 17, 10:10 PM EDTFlash Flood WarningOKXKings, Nassau, New York, Queens57 min
Jul 22, 5:30 PM EDTFlash Flood WarningBGMSteuben3 hr
Jul 22, 6:38 PM EDTFlash Flood WarningBGMSteuben92 min
Jul 24, 12:55 PM EDTFlash Flood WarningBGMOneida118 min
Jul 24, 4:18 PM EDTFlash Flood WarningBGMSullivan2 hr
Jul 24, 4:49 PM EDTFlash Flood WarningBGMCortland, Tioga, Tompkins4 hr
Jul 24, 4:59 PM EDTFlash Flood WarningBGMSullivan3 hr
Jul 24, 5:09 PM EDTFlash Flood WarningBUFJefferson, Lewis, Oswego3 hr
Jul 24, 8:12 PM EDTFlash Flood WarningBGMBroome, Chenango, Cortland3 hr
Jul 24, 8:40 PM EDTFlash Flood WarningBGMDelaware, Otsego3 hr
Jul 24, 8:47 PM EDTFlash Flood WarningBGMBroome, Chenango, Tioga3 hr
Jul 24, 9:21 PM EDTFlash Flood WarningBGMBroome, Chenango4 hr
Jul 24, 10:10 PM EDTFlash Flood WarningBGMBroome4 hr
Jul 24, 10:52 PM EDTFlash Flood WarningBGMDelaware3 hr
Jul 29, 2:38 PM EDTFlash Flood WarningOKXNassau, Suffolk111 min
Aug 2, 3:36 PM EDTFlash Flood WarningBGMSteuben114 min
Aug 2, 4:24 PM EDTFlash Flood WarningBGMSteuben3 hr
Aug 2, 4:46 PM EDTFlash Flood WarningBUFAllegany, Cattaraugus2 hr
Aug 3, 3:23 PM EDTFlash Flood WarningBGMSullivan3 hr
Aug 3, 3:46 PM EDTFlash Flood WarningOKXRockland, Westchester119 min
Aug 3, 4:45 PM EDTFlash Flood WarningOKXWestchester95 min
Aug 3, 5:31 PM EDTFlash Flood WarningOKXBronx, New York, Queens, Westchester119 min
Aug 5, 1:35 PM EDTFlash Flood WarningBUFErie2 hr
Aug 5, 3:42 PM EDTFlash Flood WarningBUFErie, Genesee4 hr
Aug 5, 5:03 PM EDTFlash Flood WarningBGMChemung, Tioga68 min
Aug 5, 5:26 PM EDTFlash Flood WarningBGMBroome, Tioga3 hr
Aug 5, 6:10 PM EDTFlash Flood WarningBGMTioga3 hr
Aug 5, 8:26 PM EDTFlash Flood WarningBGMMadison, Oneida3 hr
Aug 6, 12:18 PM EDTFlash Flood WarningOKXSuffolk72 min
Aug 6, 2:43 PM EDTFlash Flood WarningOKXSuffolk75 min
Aug 6, 4:58 PM EDTFlash Flood WarningOKXBronx, Nassau, New York, Westchester5 hr
Aug 6, 6:40 PM EDTFlash Flood WarningOKXNassau, Suffolk3 hr
Aug 9, 7:52 AM EDTFlash Flood WarningBGMBroome8 hr
Aug 9, 9:29 AM EDTFlash Flood WarningBGMChemung, Schuyler, Steuben, Yates6 hr
Aug 9, 10:09 AM EDTFlash Flood WarningALYGreene, Ulster3 hr
Aug 9, 11:13 AM EDTFlash Flood WarningBGMBroome, Chenango, Cortland4 hr
Aug 9, 11:14 AM EDTFlash Flood Warning EmergencyBUFAllegany6 hr
Aug 9, 12:08 PM EDTFlash Flood Warning EmergencyCatastrophic damage threatBGMSteuben6 hr
Aug 9, 12:22 PM EDTFlash Flood WarningBUFOntario4 hr
Aug 9, 12:28 PM EDTFlash Flood WarningBGMBroome, Cayuga, Chemung, Schuyler, Seneca, Tioga and 1 more6 hr
Aug 9, 1:33 PM EDTFlash Flood WarningBGMBroome, Chenango, Delaware, Otsego4 hr
Aug 9, 1:41 PM EDTFlash Flood WarningBUFCayuga, Ontario, Oswego, Wayne4 hr
Aug 9, 2:49 PM EDTFlash Flood WarningBGMDelaware, Otsego, Sullivan3 hr
Aug 9, 2:51 PM EDTFlash Flood WarningBUFJefferson, Oswego4 hr
Aug 9, 3:02 PM EDTFlash Flood WarningALYAlbany, Greene, Schoharie, Ulster3 hr
Aug 9, 3:49 PM EDTFlash Flood WarningALYAlbany, Montgomery, Rensselaer, Saratoga, Schenectady, Schoharie3 hr
Aug 9, 4:48 PM EDTFlash Flood WarningBTVSt. Lawrence4 hr
Aug 9, 5:07 PM EDTFlash Flood WarningBTVFranklin, St. Lawrence4 hr
Aug 9, 5:23 PM EDTFlash Flood WarningALYRensselaer, Washington2 hr
Aug 9, 6:09 PM EDTFlash Flood WarningBTVFranklin, St. Lawrence3 hr
Aug 15, 3:18 PM EDTFlash Flood WarningBGMOneida117 min
Aug 18, 9:26 AM EDTFlash Flood WarningOKXWestchester6 hr
Aug 18, 2:26 PM EDTFlash Flood WarningBGMChenango, Madison, Oneida5 hr
Aug 18, 5:37 PM EDTFlash Flood WarningBGMBroome3 hr
Aug 18, 5:46 PM EDTFlash Flood WarningOKXOrange, Putnam, Rockland, Westchester3 hr
Aug 18, 6:38 PM EDTFlash Flood WarningOKXRockland3 hr
Aug 18, 6:43 PM EDTFlash Flood WarningBGMOneida5 hr
Aug 18, 7:17 PM EDTFlash Flood WarningOKXBronx, New York, Richmond, Rockland, Westchester3 hr
Aug 18, 9:53 PM EDTFlash Flood WarningOKXNassau, Suffolk3 hr
Aug 18, 11:03 PM EDTFlash Flood WarningOKXSuffolk3 hr
Aug 18, 11:59 PM EDTFlash Flood WarningOKXSuffolk7 hr
Aug 19, 12:10 AM EDTFlash Flood Warning Considerable damage threatOKXNassau, Suffolk3 hr
Aug 19, 1:20 AM EDTFlash Flood Warning EmergencyCatastrophic damage threatOKXSuffolk3 hr
Aug 19, 3:04 PM EDTFlash Flood WarningALYAlbany, Schenectady2 hr
Aug 19, 3:35 PM EDTFlash Flood WarningOKXSuffolk82 min
Aug 31, 8:16 PM EDTFlash Flood WarningBGMChemung, Steuben85 min
Sep 6, 9:43 PM EDTFlash Flood WarningBUFCattaraugus2 hr
Sep 9, 5:05 PM EDTFlash Flood WarningBUFMonroe, Wayne4 hr
Sep 21, 4:50 PM EDTFlash Flood WarningBUFAllegany4 hr
Sep 21, 6:18 PM EDTFlash Flood WarningBUFAllegany2 hr
Sep 21, 7:27 PM EDTFlash Flood WarningBUFAllegany4 hr

By county

Every county with at least one alert. A county page lists each alert that covered it.

16 more counties

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.