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This statement covers Flash Floods.
Since 1996...Flash Floods have accounted for 12 deaths and more than 52 million dollars in property damage across the tri state area.
Flash Floods can occur anywhere from within a few minutes to a few hours of excessive rainfall. The two key elements contributing to Flash Flooding are rainfall intensity and duration.
Slow moving thunderstorms moving over the same area can produce rainfall rates in excess of 1 to 2 inches per hour for several hours. These storms...which climatologically occur from spring
through fall...can produce flash flooding of street and poor drainage areas...small streams and rivers.
When there is a potential for flooding beyond 36 hours...our National Weather Service office in Long Island NY will provide this information in our Hazardous Weather Outlook text product.
Flood Watches are issued by our National Weather Service office when there is a potential
for any type of flooding...except tidal flooding...within 36 hours.
We will issue a Flood Warning headlined as...Urban Flood Warning when moderate or greater flooding is expected in poor drainage areas...low-lying areas and on roads in highly urbanized areas.
Flash Flood Warnings will be issued when any type of flooding... except tidal flooding...will create an immediate threat to life and property within 6 hours. Last year...we correctly forecast 89
percent of 29 Flash Flood events with an average lead time of 68 minutes. Our office uses a combination of weather radar...rain gages and volunteer skywarn spotter observations to issue warnings.
These outlooks...Watches and Warnings will be issued for people living in...11 counties in Southeast NY covering the Lower Hudson Valley...New York City and Long Island...5 counties in Northeast New
Jersey and 4 counties in Southern Connecticut.