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Initial Briefing

Heavy Rain and Minor Coastal Flooding

What Has Changed?

Decision Support Briefing #1

As of: 6:00 PM Apr 18, 2019

New York, NY

Current Hazards

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Main Points

Hazard Impacts Location Timing

Flash

Flooding

River

Flooding

Coastal

Impacts

• 1 ½ to 2 inches, locally higher

amounts.

• Flash Flooding of Urban Areas,

Low-lying Roads, and Small

Rivers, Streams and Creeks.

• Rises on Large Stem Rivers with

Minor Flooding continuing along

the lower Connecticut River.

• Minor to Localized Moderate

coastal flooding.

• Inundation of 1 to 2 ft above

ground in vulnerable areas.

• Beach Flooding and Areas of

Dune Erosion.

Entire Tri-State Region

Lower Hud Valley, NE

NJ, and S CT

Vulnerable locales along

Jamaica Bay, S Bays of

W LI, and W LI Sound

Late Friday Night into

Saturday Afternoon

Through the Weekend

During the times of high tide

Tonight and possibly Friday

Night

New York, NY

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None Limited Elevated Significant Extreme

Summary of Greatest Impacts

None Limited Elevated Significant Extreme

None Limited Elevated Significant Extreme

Flash Flooding: Entire Tri-State Region

River Flooding: Lower Hud Valley, NE NJ, and S CT

Coastal Impacts: Vulnerable locales along Jamaica Bay, S

Bays of W LI, and W LI Sound

New York, NY

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Flash Flood Watch from 2 am to 2 pm Saturday

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Heavy Rain

New York, NY

Hazards: Rainfall of 1 ½ to 2 inches

Rainfall rates of 1“/hr possible

Impacts: Minor/Flash Flooding of Urban Areas, Low-

lying Roads, and Small Rivers, Streams, and

Creeks.

Rises likely on Large Stem Rivers

Minor Flooding on the lower Connecticut River

continues through the weekend

Timing: Heaviest rain from Late Friday Night through

Early Saturday Afternoon

Uncertainty: Axis of heaviest rainfall will be

refined as event draws closer

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River Flood Outlook

New York, NY

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Marine / Coastal Hazards

Coastal Flood Hazards and Impacts: Minor to Localized Moderate coastal

flooding during times of high tide Tonight

Inundation of 1 to 2 ft above ground in

vulnerable locales along Jamaica Bay, S

Bays of W LI, and W LI Sound

Scattered waterfront road closures

Shoreline Hazards and Impacts: 8 to 12’ breaking waves along the

oceanfront Friday night into Saturday

Beach Flooding and Areas of Dune

Erosion along the Atlantic ocean

beachfront

Minor damage to dune structures

Uncertainty: Additional localized minor

coastal flooding possible during the times of

high tide through the weekend

Coastal Flooding

Please go to the NWS New York, NY Coastal Flooding Page for the latest coastal flood forecast and the tools to visualize the coastal impacts.https://www.weather.gov/okx/coastalflood

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Event Summary

Flash Flood Watch in Effect Late Friday Night into Saturday

Afternoon

Flash Flooding of Urban Areas, Low-lying Roads, and Small

Rivers, Streams and Creeks possible.

Rises on Large Stem Rivers with Minor Flooding continuing along

the lower Connecticut River through this weekend.

Minor to Localized Moderate coastal flooding during the times of

high tide tonight.

New York, NY

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Contact and Next Briefing Information

Next Briefing

Disclaimer: The information contained within this briefing is

time-sensitive, do not use after 6 AM Friday (04/19/19).

Method: Email

When: Around 600 AM Tomorrow (Fri)

New York, NY

Web:

http://www.weather.gov/okx/

Phone (public):

631-924-0517

Facebook:

http://www.facebook.com/NWSNewYorkNY

Twitter:

http://www.twitter.com/NWSNewYorkNY

YouTube:

https://www.youtube.com/user/NWSNewYorkNY