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Areal Flood Watch — Delaware, PA, Philadelphia, PA, Western Chester, PA, Eastern Chester, PA, Western Montgomery, PA, Eastern Montgomery, PA, Upper Bucks, PA, Lower Bucks, PA, Morris, NJ, Carbon, PA, Monroe, PA, Berks, PA, Lehigh, PA, Northampton, PA
Issued
Expires
1:00 AM CDT · Fri, Aug 21 2026
Issuing Office
NWS KPHI

Affected Areas

Delaware, PA Philadelphia, PA Western Chester, PA Eastern Chester, PA Western Montgomery, PA Eastern Montgomery, PA Upper Bucks, PA Lower Bucks, PA Morris, NJ Carbon, PA Monroe, PA Berks, PA Lehigh, PA Northampton, PA

Official Bulletin

160
WGUS61 KPHI 201655
FFAPHI

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Mount Holly NJ
1255 PM EDT Thu Aug 20 2026

NJZ001-007-PAZ054-055-060>062-210500-
/O.EXA.KPHI.FA.A.0008.000000T0000Z-260821T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sussex-Warren-Carbon-Monroe-Berks-Lehigh-Northampton-
Including the cities of Stroudsburg, Newton, Allentown,
Bethlehem, Reading, Washington, Jim Thorpe, and Easton
1255 PM EDT Thu Aug 20 2026

...FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT...

* WHAT...Flash flooding caused by excessive rainfall continues to be
  possible.

* WHERE...Portions of northern New Jersey, including the following
  counties, Sussex and Warren and Pennsylvania, including the
  following counties, Berks, Carbon, Lehigh, Monroe and Northampton.

* WHEN...Through late tonight.

* IMPACTS...Flooding may occur in poor drainage and urban areas.
  Creeks and streams may rise out of their banks. Excessive runoff
  may result in flooding of rivers, creeks, streams, and other
  low-lying and flood-prone locations.

* ADDITIONAL DETAILS...
  - Showers and a thundertorms are expected through this evening.
    Rainfall rates of 1 to 3 inches per hour are possible in
    stronger storms. Total rainfall amounts of 1 to 2 inches are
    expected with some areas experiencing 3 to 5 inches of
    rainfall which could cause flash flooding.
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

DEZ001-NJZ008>010-012>022-025>027-PAZ070-071-101>106-210500-
/O.CON.KPHI.FA.A.0008.000000T0000Z-260821T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle-Morris-Hunterdon-Somerset-Middlesex-Western Monmouth-
Eastern Monmouth-Mercer-Salem-Gloucester-Camden-Northwestern
Burlington-Ocean-Cumberland-Atlantic-Coastal Atlantic-Coastal
Ocean-Southeastern Burlington-Delaware-Philadelphia-Western
Chester-Eastern Chester-Western Montgomery-Eastern Montgomery-
Upper Bucks-Lower Bucks-
Including the cities of Atlantic City, Wilmington, Wharton State
Forest, Moorestown, Flemington, Collegeville, Media, Kennett
Square, Trenton, Oxford, Glassboro, Pottstown, Chalfont, Sandy
Hook, Freehold, Cherry Hill, Lansdale, Honey Brook, Doylestown,
Hammonton, Camden, New Brunswick, Philadelphia, Norristown,
Jackson, Somerville, Morristown, West Chester, Mount Holly,
Perkasie, Morrisville, Long Beach Island, Pennsville, and
Millville
1255 PM EDT Thu Aug 20 2026

...FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TONIGHT...

* WHAT...Flash flooding caused by excessive rainfall continues to be
  possible.

* WHERE...Portions of northern Delaware, including the following
  area, New Castle, New Jersey, including the following areas,
  Atlantic, Camden, Coastal Atlantic, Coastal Ocean, Cumberland,
  Eastern Monmouth, Gloucester, Hunterdon, Mercer, Middlesex,
  Morris, Northwestern Burlington, Ocean, Salem, Somerset,
  Southeastern Burlington and Western Monmouth, and southeast
  Pennsylvania, including the following areas, Delaware, Eastern
  Chester, Eastern Montgomery, Lower Bucks, Philadelphia, Upper
  Bucks, Western Chester and Western Montgomery.

* WHEN...Through late tonight.

* IMPACTS...Flooding may occur in poor drainage and urban areas.
  Creeks and streams may rise out of their banks. Excessive runoff
  may result in flooding of rivers, creeks, streams, and other
  low-lying and flood-prone locations.

* ADDITIONAL DETAILS...
  - Showers and a thundertorms are expected through this evening.
    Rainfall rates of 1 to 3 inches per hour are possible in
    stronger storms. Total rainfall amounts of 1 to 2 inches are
    expected with some areas experiencing 3 to 5 inches of
    rainfall which could cause flash flooding.
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

Manning