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National Weather Service Extends Flood Watch for Mid-Atlantic Region Through Late Thursday Night

A Flood Watch for 25 zones in New Jersey, southeast Pennsylvania, and northern Delaware now runs longer than first issued, ending early Friday morning.

4 reports on this incident · first at Aug 19, 2026, 2:56 p.m. ET

By AI ReporterWritten Aug 19, 2026, 3:29 p.m. ET
The for portions of the Mid-Atlantic now runs longer than first issued, beginning at 12:00 PM EDT on August 20, 2026, and expiring at 2:00 AM EDT on August 21, 2026. Official records from the state that flash flooding caused by excessive rainfall is possible across zones According to the official record, excessive runoff may cause rivers, creeks, and streams to flood, with creeks and streams potentially rising out of their banks. Flooding may also occur in urban areas and locations with poor drainage. The National Weather Service advises that residents monitor later forecasts and be prepared to take action if Flash Flood Warnings are issued. The alert covers areas including New Castle in northern Delaware; Atlantic, Camden, Coastal Atlantic, Coastal Ocean, Cumberland, Eastern Monmouth, Gloucester, Hunterdon, Mercer, Middlesex, Northwestern Burlington, Ocean, Salem, Somerset, Southeastern Burlington, and Western Monmouth in New Jersey; and Delaware, Eastern Chester, Eastern Montgomery, Lower Bucks, Philadelphia, Upper Bucks, Western Chester, and Western Montgomery in southeast Pennsylvania. Cities within the area include Philadelphia, Wilmington, Trenton, Camden, Atlantic City, Flemington, and New Brunswick.

Earlier reports

  1. Aug 19, 2026, 3:28 p.m. ET

    Flood Watch Covers 25 Zones in New Jersey, Southeast Pennsylvania and Northern Delaware

    Official records from the National Weather Service Mount Holly NJ state that a Flood Watch was issued on August 19, 2026, at 2:08 PM EDT. The watch covers 25 zones across northern Delaware, New Jersey, and southeast Pennsylvania, beginning at 12:00 PM EDT on August 20, 2026, and expiring at 2:00 AM EDT on August 21, 2026.

    NWS official records indicate that flash flooding caused by excessive rainfall is possible from Thursday afternoon through late Thursday night. Excessive runoff may result in the flooding of rivers, creeks, streams, and other low-lying or flood-prone locations. Creeks and streams may rise out of their banks, and flooding may occur in poor drainage and urban areas.

    The watch applies to northern Delaware, including New Castle; New Jersey, including Atlantic, Camden, Coastal Atlantic, Coastal Ocean, Cumberland, Eastern Monmouth, Gloucester, Hunterdon, Mercer, Middlesex, Northwestern Burlington, Ocean, Salem, Somerset, Southeastern Burlington, and Western Monmouth; and southeast Pennsylvania, including Delaware, Eastern Chester, Eastern Montgomery, Lower Bucks, Philadelphia, Upper Bucks, Western Chester, and Western Montgomery. Affected cities listed include Philadelphia, Wilmington, Trenton, Camden, Atlantic City, and New Brunswick. Official records advise monitoring later forecasts and preparing to take action should Flash Flood Warnings be issued.

  2. Aug 19, 2026, 3:10 p.m. ET

    NWS Outlines Potential Creek and Urban Flooding Impacts for Mid-Atlantic

    Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations, according to the National Weather Service Mount Holly NJ. The agency warned that creeks and streams may rise out of their banks, and flooding may occur in poor drainage and urban areas across 25 affected zones in northern Delaware, New Jersey, and southeast Pennsylvania.

    The alert applies to a Flood Watch that begins at 12:00 PM EDT on August 20, 2026, and expires at 2:00 AM EDT on August 21, 2026, spanning from Thursday afternoon through late Thursday night. Flash flooding caused by excessive rainfall is possible in cities including Philadelphia, Wilmington, Camden, Trenton, New Brunswick, and Atlantic City. The official alert was issued at 2:08 PM EDT on August 19, 2026.

    Residents are advised by the National Weather Service to monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.

  3. Aug 19, 2026, 2:56 p.m. ETFirst report

    National Weather Service Issues Flood Watch for Mid-Atlantic Region

    A developing weather situation on August 20, 2026, has prompted a Flood Watch issued by the National Weather Service Mount Holly NJ. According to official weather records, the watch was issued at 14:08 on August 19, 2026, and covers 25 zones. The watch starts at 12:00 PM on August 20, 2026, and expires at 2:00 AM on August 21, 2026.

    Official weather records state that flash flooding caused by excessive rainfall is possible. Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks, and flooding may occur in poor drainage and urban areas. Official records state that residents should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.

    The affected areas listed in official records include New Castle in Delaware; Atlantic, Camden, Coastal Atlantic, Coastal Ocean, Cumberland, Eastern Monmouth, Gloucester, Hunterdon, Mercer, Middlesex, Northwestern Burlington, Ocean, Salem, Somerset, Southeastern Burlington, and Western Monmouth in New Jersey; as well as Delaware, Eastern Chester, Eastern Montgomery, Lower Bucks, Philadelphia, Upper Bucks, Western Chester, and Western Montgomery in Pennsylvania. Cities within the watch area include Camden, Flemington, Oxford, West Chester, Pennsville, Trenton, Perkasie, Wilmington, Collegeville, Doylestown, Lansdale, New Brunswick, Kennett Square, Media, Sandy Hook, Chalfont, Atlantic City, Pottstown, Philadelphia, Norristown, Morrisville, Wharton State Forest, Cherry Hill, Hammonton, and Honey Brook.

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Revision history

  1. Version 119 Aug 2026, 19:29current

    First published.

  2. Version 119 Aug 2026, 19:10current

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  3. Version 119 Aug 2026, 18:56current

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  4. Version 119 Aug 2026, 19:28current

    First published.

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