HLSPHI DEZ001>004-MDZ008-012-015-019-020-NJZ001-007>010-012>027-PAZ070-071-101>106-050000- Tropical Storm Isaias Local Statement Advisory Number 30 National Weather Service Mount Holly NJ AL092020 1121 AM EDT Tue Aug 4 2020 This product covers NEW JERSEY...DELAWARE...SOUTHEASTERN PENNSYLVANIA AND NORTHEAST MARYLAND ** Isaias Continues to Impact the Region through This Evening ** 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 90 miles west of Atlantic City NJ or about 30 miles west of Dover DE - 39.1N 76.1W - Storm Intensity 70 mph - Movement North-northeast or 20 degrees at 35 mph SITUATION OVERVIEW ------------------ Tropical Storm Isaias is passing over Delmarva and will continue to track northward, and then northeastward along the East Coast of the United States. Isaias will lift north of the region by early this evening. Impacts will diminish from 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. Tornadoes will continue to affect the region. 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. Tornadoes have impacted Delmarva, and tornadoes will affect portions of New Jersey and southeast Pennsylvania into this afternoon. 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: Potential impacts from the flooding rain are still unfolding across Delmarva, western New Jersey, and eastern Pennsylvania. Remain well guarded against life-threatening flood waters having additional devastating impacts. If realized, these impacts include: - Extreme rainfall flooding may prompt numerous evacuations and rescues. - Rivers and tributaries may overwhelmingly overflow their banks in many places with deep moving water. Small streams, creeks, canals, arroyos, and ditches may become raging rivers. In mountain areas, deadly runoff may rage down valleys while increasing susceptibility to rockslides and mudslides. Flood control systems and barriers may become stressed. - Flood waters can enter numerous structures within multiple communities, some structures becoming uninhabitable or washed away. Numerous places where flood waters may cover escape routes. Streets and parking lots become rivers of raging water with underpasses submerged. Driving conditions become very dangerous. Numerous road and bridge closures with some weakened or washed out. Potential impacts from the flooding rain are still unfolding across coastal New Jersey and Delaware. Remain well guarded against life- threatening flood waters having additional significant to extensive impacts. * WIND: Potential impacts from the main wind event are now unfolding across NEW JERSEY...DELAWARE...SOUTHEASTERN PENNSYLVANIA AND NORTHEAST MARYLAND. Remain well sheltered from dangerous wind having additional significant impacts. If realized, these impacts 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. * TORNADOES: Potential impacts from tornadoes are still unfolding across New Jersey, eastern Pennsylvania, and Delmarva. Remain well braced against a dangerous tornado event having additional significant impacts. If realized, these impacts include: - The occurrence of scattered tornadoes can hinder the execution of emergency plans during tropical events. - Several places may experience tornado damage with a few spots of considerable damage, power loss, and communications failures. - Locations could realize roofs torn off frame houses, mobile homes demolished, boxcars overturned, large trees snapped or uprooted, vehicles tumbled, and small boats tossed about. Dangerous projectiles can add to the toll. * SURGE: Potential impacts from the main surge event are now unfolding across Delaware Bay, the tidal Delaware River, northeastern Chesapeake Bay, and the Atlantic coasts of New Jersey and Delaware. Remain well away from locally hazardous surge having additional limited impacts. If realized, these impacts include: - Localized inundation with storm surge flooding mainly along immediate shorelines and in low-lying spots, or in areas farther inland near where higher surge waters move ashore. - Sections of near-shore roads and parking lots become overspread with surge water. Driving conditions dangerous in places where surge water covers the road. - Moderate beach erosion. Heavy surf also breaching dunes, mainly in usually vulnerable locations. Strong rip currents. - Minor to locally moderate damage to marinas, docks, boardwalks, and piers. A few small craft broken away from moorings. Elsewhere across NEW JERSEY...DELAWARE...SOUTHEASTERN PENNSYLVANIA AND NORTHEAST MARYLAND, little to no impact is anticipated. PRECAUTIONARY/PREPAREDNESS ACTIONS ---------------------------------- * OTHER PREPAREDNESS INFORMATION: Now is the time to stay inside and away from windows. Listen for updates and be ready in case you lose electrical power. Keep a battery- powered radio, charged cell phone and flashlight handy. 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 venture outside while in the eye of a hurricane as any improvement in weather will only be temporary. Once the eye passes, conditions will become life threatening as winds immediately return to dangerous speeds, so remain safely sheltered from the storm. Do not be a thrill seeker or risk your life for senseless photos or videos. Quickly move to the safest place within your shelter if it begins to fail, preferably an interior room on the lowest floor as long as flooding is not a concern. 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. If a tornado warning is issued for your area, quickly move to the safest place within your shelter. Protect your head and body. * 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 6 PM EDT, or sooner if conditions warrant. $$ $$