Alert archive / Pennsylvania / Flood Watches in 2023

Flood Watch 3, NWS Philadelphia/Mount Holly

June 27, 20237 counties in New Jersey; New Castle County, Delaware; 10 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this flood watch at Jun 27, 2023, 3:02 AM EDT for 7 counties in New Jersey; New Castle County, Delaware; 10 counties in Pennsylvania. It took effect at Jul 2, 2023, 12:00 PM EDT. It was in force for .

The area

The counties it named.

The facts

Issued
Jun 27, 2023, 3:02 AM EDT (07:02 UTC)
In effect from
Jul 2, 2023, 12:00 PM EDT
Expired
Jun 27, 2023, 3:48 AM EDT
In force
Issued by
NWS Philadelphia/Mount Holly
Flood severity
None

Counties New Castle County, DE, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Morris 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), 87 km from the middle of the area, began a volume at 07:06 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 00:00Z, 7.0 hours before the alert went out and 200 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.

Skew-T log-pSkew-T log-p diagram, Brookhaven, NY at 00:00Z on 2023-06-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 482 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 00:00Z on 2023-06-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 134 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
482 J/kg
Mixed-layer CIN
-74 J/kg
Mixed-layer LCL
987 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
134 m²/s²
0-3 km storm-relative helicity
127 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.3

Open this sounding in Storm Lab

The text

As transmitted.

135 
WGUS61 KPHI 270702
FFAPHI

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Mount Holly NJ
302 AM EDT Tue Jun 27 2023

NJZ001-007>010-PAZ061-062-272000-
/O.NEW.KPHI.FA.A.0003.230702T1600Z-230703T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sussex-Warren-Morris-Hunterdon-Somerset-Lehigh-Northampton-
Including the cities of Flemington, Allentown, Easton, Morristown, 
Washington, Bethlehem, Somerville, and Newton
302 AM EDT Tue Jun 27 2023

...FLOOD WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH SUNDAY 
EVENING...

* WHAT...Flooding caused by excessive rainfall is possible.

* WHERE...Portions of New Jersey...and east central Pennsylvania...
  including the following counties...in New Jersey...Hunterdon, 
  Morris, Somerset, Sussex, and Warren. In east central 
  Pennsylvania...Lehigh and Northampton.

* WHEN...From Sunday afternoon through Sunday evening.

* 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. Low-water crossings may be 
  flooded. Area creeks and streams are running high and could flood 
  with more heavy rain.

* ADDITIONAL DETAILS...
  - Scattered showers and thunderstorms with locally heavy rain
    and expected across the watch area this afternoon and
    evening. Widespread rainfall amounts of 2-4 inches occurred
    on Monday, saturating the ground. Rainfall amounts of 1-2
    inches with localized amounts near 3 inches will be possible
    with the showers and thunderstorms today. These totals may
    result in additional flash flooding.
  - http://www.weather.gov/safety/flood

$$

DEZ001-NJZ012-015-PAZ054-055-060-070-071-101>106-272000-
/O.NEW.KPHI.FA.A.0003.230702T1600Z-230703T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle-Middlesex-Mercer-Carbon-Monroe-Berks-Delaware-
Philadelphia-Western Chester-Eastern Chester-Western Montgomery-
Eastern Montgomery-Upper Bucks-Lower Bucks-
Including the cities of Philadelphia, Kennett Square, Lansdale, 
Norristown, Reading, Media, Collegeville, Chalfont, Perkasie, 
Morrisville, Doylestown, Trenton, Stroudsburg, Jim Thorpe, New 
Brunswick, Oxford, Wilmington, Pottstown, West Chester, and Honey 
Brook
302 AM EDT Tue Jun 27 2023

...FLOOD WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH SUNDAY 
EVENING...

* WHAT...Flooding caused by excessive rainfall is possible.

* WHERE...Portions of northern Delaware...New Jersey...and 
  Pennsylvania...including the following areas...in northern 
  Delaware...New Castle. In New Jersey...Mercer and Middlesex. In 
  Pennsylvania...Berks, Carbon, Delaware, Eastern Chester, Eastern 
  Montgomery, Lower Bucks, Monroe, Philadelphia, Upper Bucks, 
  Western Chester, and Western Montgomery.

* WHEN...From Sunday afternoon through Sunday evening.

* 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. Low-water crossings may be 
  flooded.

* ADDITIONAL DETAILS...
  - Scattered showers and thunderstorms with locally heavy rain
    and expected across the watch area this afternoon and
    evening. Widespread rainfall amounts near 1 inch with locally
    higher amounts near 3 inches occurred on Monday, saturating
    the ground. Rainfall amounts of 1-2 inches with localized
    amounts near 3 inches will be possible with the showers and
    thunderstorms today. These totals may result in additional
    flash flooding.
  - http://www.weather.gov/safety/flood

$$

Staarmann
1 follow-up statement
193 
WGUS61 KPHI 270748
FFAPHI

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Mount Holly NJ
348 AM EDT Tue Jun 27 2023

NJZ001-007>010-PAZ061-062-272000-
/O.CAN.KPHI.FA.A.0003.230702T1600Z-230703T0400Z/
/O.NEW.KPHI.FA.A.0004.230627T1600Z-230628T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Sussex-Warren-Morris-Hunterdon-Somerset-Lehigh-Northampton-
Including the cities of Flemington, Allentown, Easton, Morristown, 
Washington, Bethlehem, Somerville, and Newton
348 AM EDT Tue Jun 27 2023

...FLOOD WATCH IN EFFECT FROM NOON EDT TODAY THROUGH THIS EVENING...

* WHAT...Flooding caused by excessive rainfall is possible.

* WHERE...Portions of New Jersey...and east central Pennsylvania...
  including the following counties...in New Jersey...Hunterdon, 
  Morris, Somerset, Sussex, and Warren. In east central 
  Pennsylvania...Lehigh and Northampton.

* WHEN...From Noon EDT today through this evening.

* 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. Low-water crossings may be 
  flooded. Area creeks and streams are running high and could flood 
  with more heavy rain.

* ADDITIONAL DETAILS...
  - Scattered showers and thunderstorms with locally heavy rain
    and expected across the watch area this afternoon and
    evening. Widespread rainfall amounts of 2-4 inches occurred
    on Monday, saturating the ground. Rainfall amounts of 1-2
    inches with localized amounts near 3 inches will be possible
    with the showers and thunderstorms today. These totals may
    result in additional flash flooding.
  - http://www.weather.gov/safety/flood

The Flood Watch is cancelled for portions of New Jersey...and east 
central Pennsylvania...including the following counties...in New 
Jersey...Hunterdon, Morris, Somerset, Sussex, and Warren. In east 
central Pennsylvania...Lehigh and Northampton.

$$

DEZ001-NJZ012-015-PAZ054-055-060-070-071-101>106-272000-
/O.CAN.KPHI.FA.A.0003.230702T1600Z-230703T0400Z/
/O.NEW.KPHI.FA.A.0004.230627T1600Z-230628T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle-Middlesex-Mercer-Carbon-Monroe-Berks-Delaware-
Philadelphia-Western Chester-Eastern Chester-Western Montgomery-
Eastern Montgomery-Upper Bucks-Lower Bucks-
Including the cities of Philadelphia, Kennett Square, Lansdale, 
Norristown, Reading, Media, Collegeville, Chalfont, Perkasie, 
Morrisville, Doylestown, Trenton, Stroudsburg, Jim Thorpe, New 
Brunswick, Oxford, Wilmington, Pottstown, West Chester, and Honey 
Brook
348 AM EDT Tue Jun 27 2023

...FLOOD WATCH IN EFFECT FROM NOON EDT TODAY THROUGH THIS EVENING...

* WHAT...Flooding caused by excessive rainfall is possible.

* WHERE...Portions of northern Delaware...New Jersey...and 
  Pennsylvania...including the following areas...in northern 
  Delaware...New Castle. In New Jersey...Mercer and Middlesex. In 
  Pennsylvania...Berks, Carbon, Delaware, Eastern Chester, Eastern 
  Montgomery, Lower Bucks, Monroe, Philadelphia, Upper Bucks, 
  Western Chester, and Western Montgomery.

* WHEN...From Noon EDT today through this evening.

* 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. Low-water crossings may be 
  flooded.

* ADDITIONAL DETAILS...
  - Scattered showers and thunderstorms with locally heavy rain
    and expected across the watch area this afternoon and
    evening. Widespread rainfall amounts near 1 inch with locally
    higher amounts near 3 inches occurred on Monday, saturating
    the ground. Rainfall amounts of 1-2 inches with localized
    amounts near 3 inches will be possible with the showers and
    thunderstorms today. These totals may result in additional
    flash flooding.
  - http://www.weather.gov/safety/flood

The Flood Watch is cancelled for portions of northern Delaware...New 
Jersey...and Pennsylvania...including the following areas...in 
northern Delaware...New Castle. In New Jersey...Mercer and 
Middlesex. In Pennsylvania...Berks, Carbon, Delaware, Eastern 
Chester, Eastern Montgomery, Lower Bucks, Monroe, Philadelphia, 
Upper Bucks, Western Chester, and Western Montgomery.

$$

Staarmann

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 26, 8:42 PM EDTSevere Thunderstorm WarningPHIHunterdon, Mercer, Middlesex, Somerset48 min
Jun 26, 8:56 PM EDTAreal Flood AdvisoryPHISussex38 min
Jun 26, 8:56 PM EDTSpecial Weather StatementPHIWarren34 min
Jun 26, 9:21 PM EDTSpecial Weather StatementPHIMercer24 min
Jun 26, 9:30 PM EDTFlash Flood WarningPHIWarren3 hr
Jun 26, 9:31 PM EDTSevere Thunderstorm WarningPHIHunterdon, Mercer, Middlesex, Somerset44 min
Jun 26, 9:34 PM EDTFlash Flood WarningPHISussex2 hr
Jun 26, 9:46 PM EDTSpecial Marine WarningPHI59 min
Jun 26, 9:51 PM EDTSevere Thunderstorm WarningPHIGloucester, Salem54 min
Jun 26, 10:07 PM EDTSpecial Weather StatementPHIMiddlesex, Morris23 min
Jun 26, 10:26 PM EDTSevere Thunderstorm WarningPHIMorris16 min
Jun 26, 10:33 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Gloucester, Salem42 min
Jun 26, 10:41 PM EDTAreal Flood AdvisoryPHISussex, Warren84 min
Jun 26, 10:54 PM EDTAreal Flood AdvisoryPHICamden, Gloucester, Salem3 hr
Jun 26, 11:07 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Hunterdon, Mercer, Middlesex, Monmouth and 1 more53 min
Jun 26, 11:27 PM EDTAreal Flood AdvisoryPHIHunterdon, Mercer, Somerset3 hr
Jun 26, 11:35 PM EDTFlash Flood WarningPHIMercer6 hr
Jun 26, 11:42 PM EDTSevere Thunderstorm WarningPHIHunterdon, Mercer, Middlesex, Somerset33 min
Jun 27, 12:00 AM EDTAreal Flood WarningPHIHunterdon, Morris, Somerset, Sussex, Warren7 hr
Jun 27, 12:12 AM EDTSpecial Weather StatementPHIMonmouth33 min
Jun 27, 12:16 AM EDTSpecial Marine WarningPHI44 min
Jun 27, 1:26 AM EDTSpecial Marine WarningPHI49 min
Jun 27, 2:00 AM EDTSpecial Marine WarningPHI45 min
Jun 27, 3:48 AM EDTFlood WatchPHIBurlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 5 more17 hr
Jun 27, 4:04 AM EDTRiver Flood WarningPHIMorris22 hr
Jun 27, 11:16 AM EDTAreal Flood AdvisoryPHIMorris, Sussex3 hr
Jun 27, 11:42 AM EDTAreal Flood AdvisoryPHIMonmouth2 hr
Jun 27, 3:05 PM EDTSevere Thunderstorm WarningPHICumberland, Salem40 min
Jun 27, 3:06 PM EDTSpecial Marine WarningPHI54 min
Jun 27, 3:32 PM EDTAreal Flood AdvisoryPHICumberland, Salem3 hr
Jun 27, 3:38 PM EDTSevere Thunderstorm WarningPHICumberland, Salem52 min
Jun 27, 3:41 PM EDTSevere Thunderstorm WarningPHISalem22 min
Jun 27, 3:52 PM EDTSpecial Marine WarningPHI53 min
Jun 27, 4:21 PM EDTSevere Thunderstorm WarningPHICumberland, Salem39 min
Jun 27, 4:24 PM EDTAreal Flood AdvisoryPHIWarren3 hr
Jun 27, 4:33 PM EDTSevere Thunderstorm WarningPHIWarren42 min
Jun 27, 4:36 PM EDTSevere Thunderstorm WarningPHICumberland, Salem26 min
Jun 27, 4:39 PM EDTSevere Thunderstorm WarningPHIHunterdon, Mercer51 min
Jun 27, 5:01 PM EDTSevere Thunderstorm WarningPHIMorris, Warren44 min
Jun 27, 5:05 PM EDTSpecial Marine WarningPHI25 min
Jun 27, 5:17 PM EDTFlash Flood WarningPHISalem4 hr
Jun 27, 5:22 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden38 min
Jun 27, 5:23 PM EDTSevere Thunderstorm WarningPHICumberland, Gloucester, Salem32 min
Jun 27, 5:40 PM EDTSpecial Weather StatementPHIHunterdon, Somerset35 min
Jun 27, 5:45 PM EDTSpecial Weather StatementPHIWarren45 min
Jun 27, 5:49 PM EDTSpecial Weather StatementPHICamden26 min
Jun 27, 5:52 PM EDTAreal Flood AdvisoryPHISussex, Warren3 hr
Jun 27, 5:52 PM EDTSpecial Weather StatementPHIBurlington38 min
Jun 27, 5:57 PM EDTAreal Flood AdvisoryPHIBurlington, Camden, Cumberland, Gloucester, Mercer, Salem3 hr
Jun 27, 6:08 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden25 min
Jun 27, 6:12 PM EDTSpecial Weather StatementPHIMiddlesex, Morris, Somerset33 min
Jun 27, 6:15 PM EDTSpecial Weather StatementPHIWarren45 min
Jun 27, 6:35 PM EDTSpecial Weather StatementPHIBurlington25 min
Jun 27, 6:40 PM EDTSpecial Marine WarningPHI36 min
Jun 27, 6:46 PM EDTSevere Thunderstorm WarningPHIMorris44 min
Jun 27, 6:49 PM EDTAreal Flood AdvisoryPHISussex3 hr
Jun 27, 6:52 PM EDTAreal Flood AdvisoryPHIHunterdon, Mercer, Middlesex, Morris, Somerset, Sussex and 1 more3 hr
Jun 27, 7:03 PM EDTSpecial Weather StatementPHISussex27 min
Jun 27, 7:30 PM EDTSpecial Weather StatementPHISussex30 min
Jun 27, 7:56 PM EDTSpecial Weather StatementPHIAtlantic34 min
Jun 26, 9:19 PM EDTSpecial Weather StatementPHINew Castle26 min
Jun 26, 9:25 PM EDTSevere Thunderstorm WarningPHINew Castle50 min
Jun 26, 10:01 PM EDTFlash Flood WarningPHINew Castle4 hr
Jun 26, 10:46 PM EDTRiver Flood WarningPHINew Castle5 hr
Jun 26, 11:09 PM EDTRiver Flood WarningPHINew Castle2 hr
Jun 27, 2:09 AM EDTSpecial Weather StatementPHINew Castle21 min
Jun 27, 2:29 AM EDTSpecial Weather StatementPHINew Castle31 min
Jun 27, 2:37 AM EDTFlash Flood WarningPHINew Castle3 hr
Jun 27, 5:08 PM EDTSevere Thunderstorm WarningPHIKent37 min
Jun 27, 6:18 PM EDTSpecial Weather StatementPHIKent27 min
Jun 26, 8:27 PM EDTSpecial Weather StatementPHIChester33 min
Jun 26, 8:33 PM EDTSpecial Weather StatementPHIPhiladelphia27 min
Jun 26, 8:36 PM EDTSpecial Weather StatementPHIBucks24 min
Jun 26, 8:40 PM EDTSevere Thunderstorm WarningPHIChester31 min
Jun 26, 9:18 PM EDTSevere Thunderstorm WarningPHIBerks42 min
Jun 26, 9:47 PM EDTSevere Thunderstorm WarningPHIChester, Montgomery43 min
Jun 26, 9:58 PM EDTSevere Thunderstorm WarningPHIChester47 min
Jun 27, 12:51 AM EDTFlash Flood WarningPHIChester, Montgomery4 hr
Jun 27, 1:23 AM EDTSpecial Weather StatementPHIMontgomery37 min
Jun 27, 2:23 AM EDTRiver Flood WarningPHIChester6 hr

Nearby

Flood Watches in Pennsylvania, 2023Flood Watches in New Jersey, 2023Flood Watches in Delaware, 2023Every flood watch in 2023

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.