Public Information Statement
Issued by NWS Upton, NY

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NOUS41 KOKX 031436 AAB

1003 AM EDT THU MAY 3 2018

...This Is Severe Weather Awareness Week...

The New York state-wide communications drill scheduled for 115 pm
today has been postponed due to threat of severe weather across
portions of the state. The drill will now be performed next
Thursday May 10, at 115 pm.

This statement covers tornadoes in the Tri-State area.

A tornado is a rapidly rotating column of air, extending down from a
cloud with a circulation that reaches the ground.

Tornadoes develop from severe thunderstorms. They occur most
frequently, on average, during the late afternoon and early evening
from June through August. However, they can occur at anytime of day.
They often develop and dissipate rapidly.

Their intensities are usually weak in our region, EF 0 and EF 1 on
the enhanced fujita, or EF, scale. This represents wind speeds from
65 to 110 mph. Their path length and width are usually small in our
area as well. Most weak tornadoes occur within areas of rain, making
them difficult to spot.

However, the area on occasion does experience a significant tornado,
one rating EF 2 or higher. The strongest tornado to impact the Tri-
State was an F4 tornado with estimated winds of 207-260 mph in
Hamden, Connecticut on July 10, 1989. August 8, 2007 was the last
time there was an EF 2 tornado in the Tri-State. This tornado moved
through the Bay Ridge section of Brooklyn with estimated winds of
111 to 135 mph.

The number of tornadoes confirmed by the NWS since 1950:

12 in New York City
31 in Long Island
26 in the Lower Hudson Valley
41 in Southern Connecticut, and
28 in Northeast New Jersey.

The NWS Storm Prediction Center in Norman, Oklahoma issues Tornado
Watches, with a lead time of up to six hours. A Tornado Watch means
that weather conditions are favorable for the development of
tornadoes in and around a defined area.

Our NWS Forecast Office on Long Island NY issues Tornado Warnings
using a combination of weather radar, observations from law
enforcement, and volunteer Skywarn Spotters to issue warnings. Take
immediate protective action to save your life.

Tomorrow we will cover flash floods.

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