Alert archive / New Jersey / Flood Watches in 2026
Flood Watch 5, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flood watch at Jul 20, 2026, 2:44 PM EDT for New Castle County, Delaware; 9 counties in New Jersey; 5 counties in Pennsylvania. It took effect at Jul 21, 2026, 6:00 AM EDT. It was in force for 16 hr.
The area
The counties it named.
The facts
- Issued
- Jul 20, 2026, 2:44 PM EDT (18:44 UTC)
- In effect from
- Jul 21, 2026, 6:00 AM EDT
- Expired
- Jul 21, 2026, 9:39 PM EDT
- In force
- 16 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Flood severity
- None
Counties New Castle County, DE, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Somerset County, NJ, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 53 km from the middle of the area, began a volume at 18:43 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, 6.7 hours before the alert went out and 194 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1548 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 22 m²/s²
- 0-3 km storm-relative helicity
- 129 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
850
WGUS61 KPHI 201844
FFAPHI
URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Mount Holly NJ
244 PM EDT Mon Jul 20 2026
DEZ001-NJZ008>010-012>015-017>019-PAZ070-071-101>106-211000-
/O.NEW.KPHI.FA.A.0005.260721T1000Z-260722T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle-Morris-Hunterdon-Somerset-Middlesex-Western Monmouth-
Eastern Monmouth-Mercer-Gloucester-Camden-Northwestern Burlington-
Delaware-Philadelphia-Western Chester-Eastern Chester-Western
Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks-
Including the cities of Honey Brook, Wilmington, Doylestown,
Morristown, West Chester, Mount Holly, Perkasie, Somerville,
Norristown, Media, Morrisville, Sandy Hook, Cherry Hill,
Collegeville, Lansdale, Moorestown, Trenton, New Brunswick,
Kennett Square, Glassboro, Pottstown, Philadelphia, Flemington,
Chalfont, Camden, Oxford, and Freehold
244 PM EDT Mon Jul 20 2026
...FLOOD WATCH IN EFFECT FROM TUESDAY MORNING THROUGH LATE TUESDAY
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,
Camden, Eastern Monmouth, Gloucester, Hunterdon, Mercer,
Middlesex, Morris, Northwestern Burlington, Somerset 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 Tuesday morning through late Tuesday night.
* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
Flooding may occur in poor drainage and urban areas.
* ADDITIONAL DETAILS...
- Multiple rounds of heavy showers and thunderstorms are
expected beginning Tuesday morning through Tuesday night.
Rainfall rates of up to 2 inches per hour will be possible at
times.
- 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.
&&
$$
MJL3 follow-up statements
508
WGUS61 KPHI 210707
FFAPHI
Flood Watch
National Weather Service Mount Holly NJ
307 AM EDT Tue Jul 21 2026
DEZ001-NJZ008>010-012>015-017>019-PAZ070-071-101>106-212100-
/O.CON.KPHI.FA.A.0005.260721T1000Z-260722T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle-Morris-Hunterdon-Somerset-Middlesex-Western Monmouth-
Eastern Monmouth-Mercer-Gloucester-Camden-Northwestern Burlington-
Delaware-Philadelphia-Western Chester-Eastern Chester-Western
Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks-
Including the cities of Chalfont, Glassboro, Kennett Square,
Doylestown, West Chester, Wilmington, Mount Holly, Flemington,
Oxford, Sandy Hook, Moorestown, Norristown, New Brunswick,
Lansdale, Perkasie, Pottstown, Honey Brook, Cherry Hill,
Philadelphia, Somerville, Camden, Trenton, Media, Morristown,
Collegeville, Freehold, and Morrisville
307 AM EDT Tue Jul 21 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,
Camden, Eastern Monmouth, Gloucester, Hunterdon, Mercer,
Middlesex, Morris, Northwestern Burlington, Somerset 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...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
Flooding may occur in poor drainage and urban areas.
* ADDITIONAL DETAILS...
- Showers and thunderstorms will increase today into tonight,
with the most widespread activity occurring this afternoon
and this evening. Some heavy showers and thunderstorms will
produce torrential rainfall, with 2 to 3 inches of rain per
hour possible. The excessive rainfall within a short period
of time, especially in urban areas, could lead to 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.
&&
$$
MJL/Gorse671
WGUS61 KPHI 212046
FFAPHI
Flood Watch
National Weather Service Mount Holly NJ
446 PM EDT Tue Jul 21 2026
DEZ001-NJZ008>010-012>015-017>019-PAZ070-071-101>106-220600-
/O.CON.KPHI.FA.A.0005.000000T0000Z-260722T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle-Morris-Hunterdon-Somerset-Middlesex-Western Monmouth-
Eastern Monmouth-Mercer-Gloucester-Camden-Northwestern Burlington-
Delaware-Philadelphia-Western Chester-Eastern Chester-Western
Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks-
Including the cities of West Chester, Flemington, Moorestown,
Sandy Hook, Mount Holly, New Brunswick, Media, Lansdale,
Wilmington, Philadelphia, Honey Brook, Chalfont, Perkasie,
Doylestown, Morristown, Pottstown, Cherry Hill, Camden, Kennett
Square, Morrisville, Glassboro, Somerville, Oxford, Norristown,
Trenton, Collegeville, and Freehold
446 PM EDT Tue Jul 21 2026
...FLOOD WATCH REMAINS IN EFFECT UNTIL 2 AM EDT WEDNESDAY...
* 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,
Camden, Eastern Monmouth, Gloucester, Hunterdon, Mercer,
Middlesex, Morris, Northwestern Burlington, Somerset 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...Until 2 AM EDT Wednesday.
* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
Flooding may occur in poor drainage and urban areas.
* ADDITIONAL DETAILS...
- Showers and thunderstorms will continue into tonight with the
most widespread activity occurring through this evening. Some
heavy showers and thunderstorms will produce torrential
rainfall, with 2 to 3 inches of rain per hour possible. The
excessive rainfall within a short period of time, especially
in urban areas, could lead to 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.
&&
$$
Hoeflich256 WGUS61 KPHI 220139 FFAPHI Flood Watch National Weather Service Mount Holly NJ 939 PM EDT Tue Jul 21 2026 DEZ001-NJZ008>010-012>015-017>019-PAZ070-071-101>106-220245- /O.CAN.KPHI.FA.A.0005.000000T0000Z-260722T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Morris-Hunterdon-Somerset-Middlesex-Western Monmouth- Eastern Monmouth-Mercer-Gloucester-Camden-Northwestern Burlington- Delaware-Philadelphia-Western Chester-Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Mount Holly, Collegeville, Norristown, Flemington, Freehold, New Brunswick, Camden, Cherry Hill, Perkasie, Moorestown, Lansdale, Media, Morristown, Chalfont, Morrisville, Trenton, Wilmington, Pottstown, Kennett Square, Honey Brook, Oxford, Sandy Hook, Glassboro, West Chester, Doylestown, Somerville, and Philadelphia 939 PM EDT Tue Jul 21 2026 ...FLOOD WATCH IS CANCELLED... The Flash Flood Watch is cancelled for portions of northern Delaware, including the following area, New Castle, New Jersey, including the following areas, Camden, Eastern Monmouth, Gloucester, Hunterdon, Mercer, Middlesex, Morris, Northwestern Burlington, Somerset and Western Monmouth, and southeast Pennsylvania, including the following areas, Delaware, Eastern Chester, Eastern Montgomery, Lower Bucks, Philadelphia, Upper Bucks, Western Chester and Western Montgomery. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. $$ Fitzsimmons
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 1:06 AM EDT | Small Craft Advisory | PHI | 71 hr |
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.