Alert archive / New Jersey / Flood Watches in 2026
Flood Watch 8, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flood watch at Aug 19, 2026, 2:08 PM EDT for New Castle County, Delaware; 15 counties in New Jersey; 10 counties in Pennsylvania. It took effect at Aug 20, 2026, 12:00 PM EDT. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Aug 19, 2026, 2:08 PM EDT (18:08 UTC)
- In effect from
- Aug 20, 2026, 12:00 PM EDT
- Expired
- Aug 20, 2026, 8:45 PM EDT
- In force
- 9 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Flood severity
- None
All 26 counties
New Castle County, DE, Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cumberland County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Ocean County, NJ, Salem County, NJ, Somerset County, NJ, Sussex County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Delaware County, PA, Lehigh County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 64 km from the middle of the area, began a volume at 18:09 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 6.1 hours before the alert went out and 197 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 20 J/kg
- Mixed-layer CIN
- -61 J/kg
- Mixed-layer LCL
- 1143 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- -58 m²/s²
- 0-3 km storm-relative helicity
- -13 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
332
WGUS61 KPHI 191808
FFAPHI
URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Mount Holly NJ
Issued by National Weather Service New York NY
208 PM EDT Wed Aug 19 2026
DEZ001-NJZ009-010-012>022-025>027-PAZ070-071-101>106-200900-
/O.NEW.KPHI.FA.A.0008.260820T1600Z-260821T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle-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 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, Honey Brook,
Moorestown, Long Beach Island, Somerville, Mount Holly, Jackson,
Millville, Glassboro, and Freehold
208 PM EDT Wed Aug 19 2026
...FLOOD WATCH IN EFFECT FROM THURSDAY AFTERNOON THROUGH LATE
THURSDAY NIGHT...
* WHAT...Flash flooding caused by excessive rainfall is 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,
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...From Thursday afternoon through late Thursday night.
* IMPACTS...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. Flooding may occur
in poor drainage and urban areas.
* ADDITIONAL DETAILS...
- Multiple rounds of showers and thunderstorms are expected across
the area beginning Thursday afternoon through Thursday evening.
Rainfall rates of 1 to 3 inches per hour are possible. Rainfall
amounts of 1 to 2 inches are possible with localized amounts of 3
to 5 inches 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.
&&
$$
DeSilva3 follow-up statements
795
WGUS61 KPHI 200539
FFAPHI
URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Mount Holly NJ
139 AM EDT Thu Aug 20 2026
NJZ008-202000-
/O.EXA.KPHI.FA.A.0008.260820T1600Z-260821T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Morris-
Including the cities of Morristown
139 AM EDT Thu Aug 20 2026
...FLOOD WATCH IN EFFECT FROM NOON EDT TODAY THROUGH LATE TONIGHT...
* WHAT...Flash flooding caused by excessive rainfall continues to be
possible.
* WHERE...A portion of northern New Jersey, including the following
county, Morris.
* WHEN...From noon EDT today through late tonight.
* IMPACTS...Flooding may occur in poor drainage and urban areas.
Creeks and streams may rise out of their banks. Excessive runoff
may result in flooding of rivers, creeks, streams, and other
low-lying and flood-prone locations.
* ADDITIONAL DETAILS...
- Multiple rounds of showers and thunderstorms are expected
across the area this afternoon through this evening. Rainfall
rates of 1 to 3 inches per hour are possible. Rainfall
amounts of 1 to 2 inches are possible with localized amounts
of 3 to 5 inches which could cause flash flooding.
- http://www.weather.gov/safety/flood
PRECAUTIONARY/PREPAREDNESS ACTIONS...
You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.
&&
$$
DEZ001-NJZ009-010-012>022-025>027-PAZ070-071-101>106-202000-
/O.CON.KPHI.FA.A.0008.260820T1600Z-260821T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle-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 Doylestown, Somerville, Media,
Norristown, Cherry Hill, Philadelphia, Freehold, Perkasie,
Lansdale, Wilmington, Hammonton, Atlantic City, Moorestown,
Jackson, West Chester, Collegeville, Camden, Oxford, Sandy Hook,
Trenton, Honey Brook, Millville, Kennett Square, New Brunswick,
Mount Holly, Long Beach Island, Wharton State Forest,
Morrisville, Flemington, Pennsville, Glassboro, Pottstown, and
Chalfont
139 AM EDT Thu Aug 20 2026
...FLOOD WATCH REMAINS IN EFFECT FROM NOON EDT TODAY 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,
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...From noon EDT today 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...
- Multiple rounds of showers and thunderstorms are expected
across the area this afternoon through this evening. Rainfall
rates of 1 to 3 inches per hour are possible. Rainfall
amounts of 1 to 2 inches are possible with localized amounts
of 3 to 5 inches 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.
&&
$$
Hoeflich160
WGUS61 KPHI 201655
FFAPHI
URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Mount Holly NJ
1255 PM EDT Thu Aug 20 2026
NJZ001-007-PAZ054-055-060>062-210500-
/O.EXA.KPHI.FA.A.0008.000000T0000Z-260821T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sussex-Warren-Carbon-Monroe-Berks-Lehigh-Northampton-
Including the cities of Stroudsburg, Newton, Allentown,
Bethlehem, Reading, Washington, Jim Thorpe, and Easton
1255 PM EDT Thu Aug 20 2026
...FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT...
* WHAT...Flash flooding caused by excessive rainfall continues to be
possible.
* WHERE...Portions of northern New Jersey, including the following
counties, Sussex and Warren and Pennsylvania, including the
following counties, Berks, Carbon, Lehigh, Monroe and Northampton.
* WHEN...Through late tonight.
* IMPACTS...Flooding may occur in poor drainage and urban areas.
Creeks and streams may rise out of their banks. Excessive runoff
may result in flooding of rivers, creeks, streams, and other
low-lying and flood-prone locations.
* ADDITIONAL DETAILS...
- Showers and a thundertorms are expected through this evening.
Rainfall rates of 1 to 3 inches per hour are possible in
stronger storms. Total rainfall amounts of 1 to 2 inches are
expected with some areas experiencing 3 to 5 inches of
rainfall which could cause flash flooding.
- http://www.weather.gov/safety/flood
PRECAUTIONARY/PREPAREDNESS ACTIONS...
You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.
&&
$$
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.
&&
$$
Manning553 WGUS61 KPHI 210045 FFAPHI Flood Watch National Weather Service Mount Holly NJ 845 PM EDT Thu Aug 20 2026 DEZ001-NJZ001-007>010-012>022-025>027-PAZ054-055-060>062-070-071- 101>106-210145- /O.CAN.KPHI.FA.A.0008.000000T0000Z-260821T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex- Western Monmouth-Eastern Monmouth-Mercer-Salem-Gloucester-Camden- Northwestern Burlington-Ocean-Cumberland-Atlantic-Coastal Atlantic-Coastal Ocean-Southeastern Burlington-Carbon-Monroe- Berks-Lehigh-Northampton-Delaware-Philadelphia-Western Chester- Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks- Lower Bucks- Including the cities of Morristown, Easton, Perkasie, Wilmington, Washington, Philadelphia, Allentown, Sandy Hook, Mount Holly, Jim Thorpe, Atlantic City, Media, Doylestown, Camden, Wharton State Forest, Bethlehem, Kennett Square, Hammonton, Reading, Long Beach Island, Pottstown, Morrisville, Chalfont, Millville, Freehold, Stroudsburg, Flemington, Moorestown, New Brunswick, Pennsville, Cherry Hill, Norristown, Collegeville, Honey Brook, West Chester, Somerville, Trenton, Jackson, Lansdale, Newton, Glassboro, and Oxford 845 PM EDT Thu Aug 20 2026 ...FLOOD WATCH IS CANCELLED... The Flash Flood Watch is cancelled for 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, Sussex, Warren and Western Monmouth, and Pennsylvania, including the following areas, Berks, Carbon, Delaware, Eastern Chester, Eastern Montgomery, Lehigh, Lower Bucks, Monroe, Northampton, Philadelphia, Upper Bucks, Western Chester and Western Montgomery. The threat for additional flooding is no longer expected therefore the flood watch is cancelled. Please continue to heed any remaining road closures. $$ Manning
Nearby
Flood Watches in New Jersey, 2026Flood Watches in Pennsylvania, 2026Flood Watches in Delaware, 2026Every flood watch in 2026
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.