Decision Support Briefing 1 As of: 945AM EDT 8/28/2017. Wakefield, VA. What Has Changed?

Transcription

1 Decision Support Briefing 1 As of: 945AM EDT 8/28/ What Has Changed? Initial Issuance

2 Main Points Hazard Impacts Location Timing Wind Damage to weak structures, trees and power lines and possible power outages due to wind gusts of 50+ mph Tidewater/Coastal Eastern Shore/NE NC Tuesday into Tuesday Evening High Surf/Rip Currents Surf of 8 to 12 feet combined with a high risk of rip currents will create dangerous swimming conditions Entire shoreline of MD/VA/NE NC Tuesday into Tuesday Evening Coastal Flooding Water Level Rises of 2 to 3 feet above normal tide possible, causing moderate flooding. Hampton Roads Tuesday into Tuesday Evening Flooding Rain Urban Areas, small creeks and streams, low lying areas and roads Tidewater and NE NC Late Monday Night into Tuesday Evening Marine Wind gusts 45 to 50 knots with seas to up to 13 feet will make it dangerous for even large ships All Coastal Waters and lower Chesapeake Bay Tuesday into Tuesday Night

3 Summary of Greatest Impacts: SE VA/NE NC/Lower MD Eastern Shore Wind: Gusts 50+ mph close to the shore/bay None Limited Elevated Significant Extreme High Surf/High Risk of Rip Currents None Limited Elevated Significant Extreme Coastal Flooding: Mainly Hampton Roads None Limited Elevated Significant Extreme Flooding: Localized Threat Tidewater/NE NC None Limited Elevated Significant Extreme Marine: Wind gusts 45 to 50 kts, Seas up to 13 ft None Limited Elevated Significant Extreme

4 High Wind Potential NE winds of 30 to 35 mph with gusts of 50 to 60 mph are expected across much of Coastal VA/Lower MD Eastern Shore and NE NC Tuesday into Tuesday Evening. These type of winds will cause downed trees and power lines, with some minor roof or structural damage.

5 Coastal Flooding Persistent and strengthening onshore flow will likely cause some minor to moderate coastal flooding during the high tide cycle Tuesday into Tuesday Night. Hampton Roads will have the greatest threat for coastal flooding with Sewells Point, Yorktown and Jamestown all expected to see moderate flooding.

6 Rain/Flooding Potential Storm Total Rainfall Monday Night Through Wednesday morning will range from an inch or less across the piedmont to 3 to 5 inches Coastal VA and NE NC. Localized Flooding of urban areas, creeks/streams, and low lying areas/roads is possible. A flood watch is in effect for all of the Tidewater and NE NC.

7 High Surf/Rip Current Potential Dangerous Surf of 7 to 10 feet and Rip Currents are expected Today into Tuesday. Swimming will be dangerous to anyone in the water. The wind combined with the surf will cause dangerous boating conditions as well and small craft are advised to remain in port.

8 Marine Threat Potential Strong NE winds of 30 to 40 kt with gusts of 45 to 50 kt are expected Tuesday into Tuesday Night. Seas of 8 to 12 feet over the coastal waters and 5 to 8 feet in the bay. The strongest winds will likely be over the coastal waters and lower Chesapeake Bay where storm force wind gusts are possible. Marine conditions will become dangerous due to the large waves and strong winds.

9 Event Summary Increasing threat for potential for wind gusts in excess of 50 mph Potential for limited urban and small stream flooding due to heavy rain late tonight into Tuesday. Dangerous Marine Conditions expected from high seas and gusts to near or slightly above storm force. Moderate coastal flooding with water levels 2 to 3 feet above normal tide levels, causing moderate impacts especially in the Hampton Roads area.

10 Contact and Next Briefing Information Next Briefing When: 5 pm EDT Monday Briefing Webpage: Briefing Available At: Web: Facebook: NWSWakefieldVA Phone (public): (757) Twitter: akq-report@noaa.gov YouTube: NWSWakefieldVA Disclaimer: The information contained within this briefing is time-sensitive, do not use after time month, date