Weather Alert in North Carolina

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Tropical Cyclone Statement issued August 21 at 4:45PM EDT by NWS Newport/Morehead City NC

AREAS AFFECTED: Mainland Dare; East Carteret; Northern Outer Banks; Ocracoke Island; Hatteras Island

DESCRIPTION: HLSMHX This product covers Eastern North Carolina **SIGNIFICANT COASTAL HAZARDS CONTINUE ALONG THE OUTER BANKS AS ERIN MOVES FURTHER AWAY** NEW INFORMATION --------------- * CHANGES TO WATCHES AND WARNINGS: - The Tropical Storm Warning has been cancelled for East Carteret, Hatteras Island, Mainland Dare, Northern Outer Banks, and Ocracoke Island * CURRENT WATCHES AND WARNINGS: - A Storm Surge Warning is in effect for East Carteret, Hatteras Island, Northern Outer Banks, and Ocracoke Island * STORM INFORMATION: - About 370 miles east-northeast of Buxton NC or about 440 miles east-northeast of Morehead City NC - 36.4N 69.1W - Storm Intensity 100 mph - Movement Northeast or 50 degrees at 20 mph SITUATION OVERVIEW ------------------ Hurricane Erin continues pulling away from Eastern North Carolina and the Outer Banks this evening as a category 2 hurricane. Wind and wave hazards are steadily decreasing through the day, but this evening's high tide will continue bringing significant coastal impacts to the Outer Banks. Moderate to significant storm surge inundation of 2 to 4 feet above ground level is expected to continue along the oceanside north of Cape Lookout, resulting in a significant threat to life and property. The worst impacts will likely be felt along the Outer Banks on Ocracoke and Hatteras Island. Portions of NC-12 and secondary roads along the Outer Banks, in particular on Hatteras and Ocracoke Islands, are already closed and will likely remain impassable or inaccessible through the remainder of this week due to significant ocean overwash. Minor to locally moderate inundation of 1 to 3 ft can also be expected for soundside areas adjacent to the southern Pamlico Sound today and possibly into Friday as well. We once again expect impacts around the high tide cycles this evening, when the higher of the daily tides is expected. Strong rip currents are expected to continue north of Cape Hatteras through the weekend, with the threat decreasing south of Cape Hatteras for remaining area beaches. Extensive beach erosion is also likely due to strong long period waves as high as 10 to 15 feet in the surf zone along the Outer Banks. Very dangerous marine conditions will continue for the coastal waters due to gusty winds and dangerous seas, with worst conditions north of Cape Lookout. Gusty winds will continue for inland sounds and rivers through tonight. This will create treacherous conditions for mariners. POTENTIAL IMPACTS ----------------- * SURGE: Potential impacts from the main surge event are now unfolding across the Outer Banks from Duck to Cape Lookout. Remain well away from life-threatening surge having additional significant impacts. If realized, these impacts include: - Areas of inundation with storm surge flooding accentuated by waves. Damage to several buildings, mainly near the coast. - Sections of near-shore escape routes and secondary roads become weakened or washed out, especially in usually vulnerable low spots. - Major beach erosion with heavy surf breaching dunes. Strong and numerous rip currents. - Moderate damage to marinas, docks, boardwalks, and piers. Several small craft broken away from moorings, especially in unprotected anchorages. Also, minor to locally moderate soundside inundation is possible across the southern Pamlico Sound and adjacent tributaries due to the north winds. Highest water levels expected across Downeast Carteret County today. Remain well away from locally hazardous surge having additional limited impacts. Elsewhere across Eastern North Carolina, little to no impact is anticipated. * WIND: Little to no additional impacts are anticipated at this time across Eastern North Carolina. PRECAUTIONARY/PREPAREDNESS ACTIONS ---------------------------------- * EVACUATIONS: Follow the advice of local officials. * OTHER PREPAREDNESS INFORMATION: During the peak of the storm be ready to move quickly. Keep your shoes on and rain gear handy. Boots and athletic shoes offer the best foot protection if you become unexpectedly exposed to the weather. Keep your cell phone charged and in power-saving mode. If you lose power, use it sparingly and mainly for personal emergencies and check-ins. Do not be a thrill seeker or risk your life for senseless photos or videos. If you are prone to flooding or in an area under a storm surge watch or warning, be prepared for the possibility of a quick and dramatic rise in water levels. * ADDITIONAL SOURCES OF INFORMATION: - For information on appropriate preparations see ready.gov - For information on creating an emergency plan see getagameplan.org - For additional disaster preparedness information see redcross.org NEXT UPDATE ----------- The next local statement will be issued by the National Weather Service in Newport/Morehead City NC around 11 PM EDT, or sooner if conditions warrant.

INSTRUCTION: N/A

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Weather Topic: What are Contrails?

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Contrails Next Topic: Cumulonimbus Clouds

A contrail is an artificial cloud, created by the passing of an aircraft.

Contrails form because water vapor in the exhaust of aircraft engines is suspended in the air under certain temperatures and humidity conditions. These contrails are called exhaust contrails.

Another type of contrail can form due to a temporary reduction in air pressure moving over the plane's surface, causing condensation. These are called aerodynamic contrails.

When you can see your breath on a cold day, it is also because of condensation. The reason contrails last longer than the condensation from your breath is because the water in contrails freezes into ice particles.

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Weather Topic: What are Cumulus Clouds?

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Cumulus Clouds Next Topic: Drizzle

Cumulus clouds are fluffy and textured with rounded tops, and may have flat bottoms. The border of a cumulus cloud is clearly defined, and can have the appearance of cotton or cauliflower.

Cumulus clouds form at low altitudes (rarely above 2 km) but can grow very tall, becoming cumulus congestus and possibly the even taller cumulonimbus clouds. When cumulus clouds become taller, they have a greater chance of producing precipitation.

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