Flash Flood Warnings in New York, 2008

By month

54 of 96 flash flood warnings covering New York in 2008 had a flash flood report inside them; 118 of 148 flash flood reports fell inside a warning, on average 73 minutes after it went out.

New York, 2008

Each office's whole area, 2008

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.

• Westchester County16
• Nassau County15
• Suffolk County15
• Putnam County11
• Rockland County11
• Queens County11
• Orange County10
• Bronx County10
• New York County9
• Kings County8
• Richmond County7
• Dutchess County6
• Saratoga County6
• Delaware County5
• Sullivan County5
• Rensselaer County5
• Erie County4
• Warren County4
• Washington County4
• Schoharie County4
• Schenectady County4
• Albany County4
• Otsego County3
• Chautauqua County3
• Columbia County3
• Broome County2
• Chenango County2
• Steuben County2
• Hamilton County2
• Herkimer County2
• Montgomery County2
• Wyoming County2
• Essex County2
• Niagara County1
• Chemung County1
• Tioga County1
• Madison County1
• Oneida County1
• Monroe County1
• Fulton County1

1. August 11, 200814flash flood warnings
2. July 23, 200811flash flood warnings
3. August 15, 20089flash flood warnings
4. July 24, 20087flash flood warnings
5. July 27, 20086flash flood warnings
6. March 8, 20084flash flood warnings
7. August 7, 20084flash flood warnings
8. June 14, 20083flash flood warnings
9. June 15, 20083flash flood warnings
10. June 23, 20083flash flood warnings
11. September 6, 20083flash flood warnings
12. June 22, 20082flash flood warnings

Alerts in force nowTornadoes on recordThe radar archive20072009

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.