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Summary for Tropical Storm Isaias (AT4/AL092020)

2020-08-04 15:47:05| National Hurricane Center (Atlantic)

...CENTER OF ISAIAS MOVING RAPIDLY ACROSS EASTERN MARYLAND... ...STRONG WINDS...HEAVY RAINFALL...AND TORNADOES WILL CONTINUE TO SPREAD NORTH-NORTHEASTWARD ALONG THE MID-ATLANTIC COAST TODAY... As of 11:00 AM EDT Tue Aug 4 the center of Isaias was located near 39.1, -76.1 with movement NNE at 35 mph. The minimum central pressure was 993 mb with maximum sustained winds of about 70 mph.

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Summary for Tropical Storm Isaias (AT4/AL092020)

2020-08-04 14:50:41| National Hurricane Center (Atlantic)

...900 AM EDT POSITION UPDATE... ...STRONG WINDS...HEAVY RAINFALL...AND TORNADOES OCCURRING OVER EASTERN MARYLAND AND THE DELMARVA PENINSULA WILL SPREAD NORTHWARD ALONG THE MID-ATLANTIC COAST TODAY... As of 9:00 AM EDT Tue Aug 4 the center of Isaias was located near 38.2, -76.6 with movement NNE at 33 mph. The minimum central pressure was 993 mb with maximum sustained winds of about 70 mph.

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Tropical Storm Isaias Update Statement

2020-08-04 14:50:41| National Hurricane Center (Atlantic)

Issued at 900 AM EDT Tue Aug 4 2020 000 WTNT64 KNHC 041250 TCUAT4 Tropical Storm Isaias Tropical Cyclone Update NWS National Hurricane Center Miami FL AL092020 900 AM EDT Tue Aug 4 2020 ...900 AM EDT POSITION UPDATE... ...STRONG WINDS...HEAVY RAINFALL...AND TORNADOES OCCURRING OVER EASTERN MARYLAND AND THE DELMARVA PENINSULA WILL SPREAD NORTHWARD ALONG THE MID-ATLANTIC COAST TODAY... A NOAA NOS/COOPS weather station at York River East, Virginia, recently reported a sustained wind of 59 mph (94 km/h) and a gust to 94 mph (150 km/h). Another NOAA NOS/COOPS weather station at Rappahannock Shoal, Virginia, recently reported a sustained wind of 53 mph (85 km/h) and a gust to 85 mph (135 km/h). SUMMARY OF 900 AM EDT...1300 UTC...INFORMATION ----------------------------------------------- LOCATION...38.2N 76.6W ABOUT 5 MI...10 KM SSW OF WILDEWOOD MARYLAND ABOUT 50 MI...80 KM S OF ANNAPOLIS MARYLAND MAXIMUM SUSTAINED WINDS...70 MPH...110 KM/H PRESENT MOVEMENT...NNE OR 25 DEGREES AT 33 MPH...54 KM/H MINIMUM CENTRAL PRESSURE...993 MB...29.32 INCHES $$ Forecaster Stewart/Roberts

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Tropical Storm Isaias Public Advisory Number 29A

2020-08-04 13:58:42| National Hurricane Center (Atlantic)

Issued at 800 AM EDT Tue Aug 04 2020 000 WTNT34 KNHC 041158 TCPAT4 BULLETIN Tropical Storm Isaias Intermediate Advisory Number 29A NWS National Hurricane Center Miami FL AL092020 800 AM EDT Tue Aug 04 2020 ...CENTER OF ISAIAS MOVING ACROSS SOUTHEASTERN VIRGINIA... ...STRONG WINDS...HEAVY RAINFALL...AND THE THREAT OF TORNADOES WILL SPREAD NORTHWARD ALONG THE MID-ATLANTIC COAST THIS MORNING... SUMMARY OF 800 AM EDT...1200 UTC...INFORMATION ---------------------------------------------- LOCATION...37.7N 76.8W ABOUT 15 MI...20 KM SSE OF TAPPAHANNOCK VIRGINIA MAXIMUM SUSTAINED WINDS...70 MPH...110 KM/H PRESENT MOVEMENT...NNE OR 25 DEGREES AT 33 MPH...54 KM/H MINIMUM CENTRAL PRESSURE...993 MB...29.33 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: The Storm Surge Warning has been discontinued for the Neuse River North Carolina. The Storm Surge Watch has been discontinued. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Storm Surge Warning is in effect for... * Pamlico and Albemarle Sounds * Ocracoke Inlet North Carolina to the North Carolina/Virginia border A Tropical Storm Warning is in effect for... * North of Surf City North Carolina to Eastport Maine * Pamlico and Albemarle Sounds * Chesapeake Bay * Tidal Potomac River * Delaware Bay * Long Island and Long Island Sound * Martha's Vineyard, Nantucket, and Block Island A Storm Surge Warning means there is a danger of life-threatening inundation, from rising water moving inland from the coastline, in the indicated locations. For a depiction of areas at risk, please see the National Weather Service Storm Surge Watch/Warning Graphic at hurricanes.gov. This is a life-threatening situation. Persons located within these areas should take all necessary actions to protect life and property from rising water and the potential for other dangerous conditions. Promptly follow evacuation and other instructions from local officials. A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area, in this case within the next 24 hours. For storm information specific to your area, including possible inland watches and warnings, please monitor products issued by your local National Weather Service forecast office. DISCUSSION AND OUTLOOK ---------------------- At 800 AM EDT (1200 UTC), the center of Tropical Storm Isaias was located over southeastern Virginia near latitude 37.7 North, longitude 76.8 West. Isaias is moving toward the north-northeast near 33 mph (54 km/h), and this general motion accompanied by some additional increase in forward speed is expected through today. On the forecast track, the center of Isaias will continue to move near or along the coast of the mid-Atlantic states today, and move across the northeastern United States into southern Canada tonight. Maximum sustained winds are near 70 mph (110 km/h) with higher gusts. Only gradual weakening is anticipated while Isaias moves north-northeastward near the mid-Atlantic coast today. A faster rate of weakening is expected to begin tonight, and the system is forecast to become post-tropical tonight or early Wednesday. Tropical-storm-force winds extend outward up to 140 miles (220 km) from the center. Sustained winds of 63 mph (101 km/h) and a gust to 77 mph (124 km/h) were recently reported at Third Island, Virginia, at the mouth of the Chesapeake Bay. The estimated minimum central pressure based on surface observations is 993 mb (29.33 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Isaias can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT4, WMO header WTNT44 KNHC, and on the web at www.hurricanes.gov/text/MIATCDAT4.shtml. STORM SURGE: The combination of a dangerous storm surge and the tide will cause normally dry areas near the coast to be flooded by rising waters moving inland from the shoreline. The water could reach the following heights above ground somewhere in the indicated areas if the peak surge occurs at the time of high tide... Cape Lookout to Ocracoke Inlet NC, including the Neuse River...1-2 ft Ocracoke Inlet to the North Carolina/Virginia border including Pamlico Sound, Albemarle Sound, and Pamlico River...3-5 ft North of the North Carolina/Virginia border to Martha's Vineyard including the Chesapeake Bay, the Tidal Potomac River, Delaware Bay, Long Island Sound, Block Island Sound, Narragansett Bay, Buzzards Bay, and Vineyard Sound...1-3 ft The deepest water will occur along the immediate coast in areas of onshore winds, where the surge will be accompanied by large waves. Surge-related flooding depends on the relative timing of the surge and the tidal cycle, and can vary greatly over short distances. For information specific to your area, please see products issued by your local National Weather Service forecast office. WIND: Widespread tropical-storm conditions are expected in the tropical storm warning area from North Carolina through the mid-Atlantic states, including portions of the Chesapeake Bay region today, with wind gusts to hurricane force possible. These winds could cause tree damage and power outages. Tropical storm conditions are expected to reach southern New England this afternoon and northern New England tonight. Gale-force winds are expected to spread into southeastern Quebec tonight and Wednesday. See products issued by Environment Canada for more information. RAINFALL: The following rainfall accumulations are expected along and near the track of Isaias: Central and eastern North Carolina into the Mid-Atlantic: 3 to 6 inches, isolated maximum totals 8 inches. Eastern New York into Vermont: 2 to 4 inches, isolated maximum totals 6 inches. Western Connecticut, western Massachusetts, New Hampshire and western Maine: 1 to 3 inches. Heavy rainfall along the East Coast, near the path of Isaias, will result in flash and urban flooding, some of which may be significant in North Carolina through the Mid-Atlantic and Northeast through tonight. Potentially life-threatening urban flooding is possible in D.C., Baltimore, and elsewhere along and just west of the I-95 corridor today. Widespread minor to moderate river flooding is likely across portions of the Carolinas and the Mid-Atlantic. Quick-responding rivers in the Northeast will also be susceptible to minor river flooding. TORNADOES: Tornadoes are most likely through midday from southeast Virginia to New Jersey. Tornadoes will remain possible this afternoon and evening from southeast New York across New England. SURF: Swells generated by Isaias will spread northward along the Mid-Atlantic and Northeast coasts of the United States today. These swells are likely to cause life-threatening surf and rip current conditions. Please consult products from your local weather office. NEXT ADVISORY ------------- Next complete advisory at 1100 AM EDT. Hourly Tropical Cyclone Update statements will begin at 900 AM EDT. $$ Forecaster Stewart

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Tropical Storm Isaias Potential Storm Surge Flooding Map

2020-08-04 11:43:42| National Hurricane Center (Atlantic)

Potential Storm Surge Flooding Map last updated Tue, 04 Aug 2020 09:43:42 GMT

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