HLSPHI DEZ001>004-MDZ008-012-015-019-020-NJZ001-007>010-012>027-PAZ070-071-101>106-041730- Tropical Storm Isaias Local Statement Advisory Number 29 National Weather Service Mount Holly NJ AL092020 520 AM EDT Tue Aug 4 2020 This product covers NEW JERSEY...DELAWARE...SOUTHEASTERN PENNSYLVANIA AND NORTHEAST MARYLAND **Isaias Will Impact the Area this Morning through Tonight** NEW INFORMATION --------------- * CHANGES TO WATCHES AND WARNINGS: - None * CURRENT WATCHES AND WARNINGS: - A Tropical Storm Warning is in effect for Atlantic, Atlantic Coastal Cape May, Camden, Cape May, Caroline, Cecil, Coastal Atlantic, Coastal Ocean, Cumberland, Delaware, Delaware Beaches, Eastern Chester, Eastern Monmouth, Eastern Montgomery, Gloucester, Hunterdon, Inland Sussex, Kent, Kent MD, Lower Bucks, Mercer, Middlesex, Morris, New Castle, Northwestern Burlington, Ocean, Philadelphia, Queen Annes, Salem, Somerset, Southeastern Burlington, Sussex, Talbot, Upper Bucks, Warren, Western Chester, Western Monmouth, and Western Montgomery * STORM INFORMATION: - About 270 miles southwest of Atlantic City NJ or about 220 miles south-southwest of Dover DE - 36.3N 77.5W - Storm Intensity 70 mph - Movement North-northeast or 20 degrees at 28 mph SITUATION OVERVIEW ------------------ Tropical Storm Isaias is currently approaching the North Carolina/ Virginia border and will continue northward and then northeastward along the East Coast of the United States. Isaias will approach the Delmarva early this morning and pass through the region today. Impacts will diminish late this afternoon into tonight. The main threats with this system are heavy rain resulting in widespread flash flooding as well as river flooding, and strong to damaging winds, especially near the coast. In addition, minor to potentially moderate coastal flooding, and dangerous marine conditions will occur. Four to six inches of rain with locally higher amounts will result in flash flooding. Strong winds along the New Jersey and Delaware coasts with wind gusts of 65 to 75 mph are possible, and wind gusts inland will range from 50 to 60 mph. Secondary threats include minor to locally moderate coastal flooding, especially in Chesapeake Bay, as well as the potential for isolated tornadoes. Dangerous rip currents and 12 to 18 foot seas are also expected over the waters. POTENTIAL IMPACTS ----------------- * FLOODING RAIN: Protect against life-threatening rainfall flooding having possible extensive impacts across the Delmarva, western New Jersey, and eastern Pennsylvania. Potential impacts include: - Major rainfall flooding may prompt many evacuations and rescues. - Rivers and tributaries may rapidly overflow their banks in multiple places. Small streams, creeks, canals, and ditches may become dangerous rivers. In hilly terrain, destructive runoff may run quickly down valleys while increasing susceptibility to rockslides and mudslides. Flood control systems and barriers may become stressed. - Flood waters can enter many structures within multiple communities, some structures becoming uninhabitable or washed away. Many places where flood waters may cover escape routes. Streets and parking lots become rivers of moving water with underpasses submerged. Driving conditions become dangerous. Many road and bridge closures with some weakened or washed out. Protect against dangerous rainfall flooding having possible significant impacts across coastal New Jersey and Delaware. * WIND: Protect against dangerous wind having possible significant impacts across New Jersey, the Delmarva, and much of southeastern Pennsylvania. Potential impacts in this area include: - Some damage to roofing and siding materials, along with damage to porches, awnings, carports, and sheds. A few buildings experiencing window, door, and garage door failures. Mobile homes damaged, especially if unanchored. Unsecured lightweight objects become dangerous projectiles. - Several large trees snapped or uprooted, but with greater numbers in places where trees are shallow rooted. Several fences and roadway signs blown over. - Some roads impassable from large debris, and more within urban or heavily wooded places. A few bridges, causeways, and access routes impassable. - Scattered power and communications outages, but more prevalent in areas with above ground lines. Also, protect against hazardous wind having possible limited impacts across east central Pennsylvania. * SURGE: Protect against life-threatening surge having possible significant impacts across Delaware Bay, the tidal Delaware River, northeastern Chesapeake Bay, and the Atlantic coasts of New Jersey and Delaware. Potential impacts in this area 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. Elsewhere across NEW JERSEY...DELAWARE...SOUTHEASTERN PENNSYLVANIA AND NORTHEAST MARYLAND, little to no impact is anticipated. * TORNADOES: Protect against a tornado event having possible limited impacts across New Jersey, Delaware, southeastern Pennsylvania, and northeast Maryland. Potential impacts include: - The occurrence of isolated tornadoes can hinder the execution of emergency plans during tropical events. - A few places may experience tornado damage, along with power and communications disruptions. - Locations could realize roofs peeled off buildings, chimneys toppled, mobile homes pushed off foundations or overturned, large tree tops and branches snapped off, shallow-rooted trees knocked over, moving vehicles blown off roads, and small boats pulled from moorings. PRECAUTIONARY/PREPAREDNESS ACTIONS ---------------------------------- * PREPAREDNESS INFORMATION: If heading to a community shelter, become familiar with the shelter rules before arrival, especially if you have special needs or have pets. Take essential items with you from your Emergency Supplies Kit. Keep cell phones well charged. Cell phone chargers for automobiles can be helpful, but be aware of your risk for deadly carbon monoxide poisoning if your car is left idling in a garage or other poorly ventilated area. It is important to remain calm, informed, and focused during an emergency. Be patient and helpful with those you encounter. If you are a visitor, be sure to know the name of the city or town in which you are staying and the name of the county or parish in which it resides. Listen for these locations in local news updates. Pay attention for instructions from local authorities. Rapidly rising flood waters are deadly. If you are in a flood-prone area, consider moving to higher ground. Never drive through a flooded roadway. Remember, turn around don`t drown! If a Tornado Warning is issued for your area, be ready to shelter quickly, preferably away from windows and in an interior room not prone to flooding. If driving, scan the roadside for quick shelter options. If in a place that is vulnerable to high wind, such as near large trees, a manufactured home, upper floors of a high-rise building, or on a boat, consider moving to a safer shelter before the onset of strong winds or flooding. Closely monitor weather.gov, NOAA Weather radio or local news outlets for official storm information. Be ready to adapt to possible changes to the forecast. Ensure you have multiple ways to receive weather warnings. * 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 Mount Holly NJ around 11 AM EDT, or sooner if conditions warrant. $$ $$