Alert archive / New Jersey / Flash Flood Watches in 2021
Flash Flood Watch 5, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood watch at Jul 16, 2021, 3:17 PM EDT for 10 counties in Pennsylvania; 14 counties in New Jersey; New Castle County, Delaware. It took effect at Jul 17, 2021, 2:00 PM EDT. It was in force for 12 hr.
The area
The counties it named.
The facts
- Issued
- Jul 16, 2021, 3:17 PM EDT (19:17 UTC)
- In effect from
- Jul 17, 2021, 2:00 PM EDT
- Expired
- Jul 18, 2021, 1:49 AM EDT
- In force
- 12 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Flood severity
- None
All 25 counties
New Castle County, DE, Atlantic County, NJ, Burlington County, NJ, Camden 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), 66 km from the middle of the area, began a volume at 19:18 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, 7.3 hours before the alert went out and 196 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
- 1044 J/kg
- Mixed-layer CIN
- -56 J/kg
- Mixed-layer LCL
- 994 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 108 m²/s²
- 0-3 km storm-relative helicity
- 105 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
498 WGUS61 KPHI 161917 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Mount Holly NJ 317 PM EDT Fri Jul 16 2021 DEZ001-NJZ001-007>010-012>020-025>027-PAZ054-055-060>062-070-071- 101>106-171215- /O.NEW.KPHI.FF.A.0005.210717T1800Z-210718T0600Z/ /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-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 Glassboro, Jim Thorpe, Flemington, Atlantic City, Easton, Philadelphia, Doylestown, Chalfont, Morristown, Jackson, Pennsville, Reading, Lansdale, Norristown, Honey Brook, Mount Holly, Cherry Hill, Moorestown, Freehold, Pottstown, Allentown, Oxford, Wharton State Forest, Kennett Square, Sandy Hook, West Chester, Morrisville, Wilmington, New Brunswick, Media, Trenton, Newton, Washington, Collegeville, Long Beach Island, Camden, Bethlehem, Stroudsburg, Perkasie, and Somerville 317 PM EDT Fri Jul 16 2021 ...FLASH FLOOD WATCH IN EFFECT FROM SATURDAY AFTERNOON THROUGH LATE SATURDAY NIGHT... The National Weather Service in Mount Holly has issued a * Flash Flood Watch for portions of northern Delaware...New Jersey... and Pennsylvania...including the following areas...in northern Delaware...New Castle. In New Jersey...Camden, Coastal Atlantic, Coastal Ocean, Eastern Monmouth, Gloucester, Hunterdon, Mercer, Middlesex, Morris, Northwestern Burlington, Ocean, Salem, Somerset, Southeastern Burlington, Sussex, Warren, and Western Monmouth. In Pennsylvania...Berks, Carbon, Delaware, Eastern Chester, Eastern Montgomery, Lehigh, Lower Bucks, Monroe, Northampton, Philadelphia, Upper Bucks, Western Chester, and Western Montgomery. * From Saturday afternoon through late Saturday night. * Thunderstorms with locally heavy rain are expected to affect eastern Pennsylvania, northern Delaware and New Jersey from Saturday afternoon into Saturday evening. Rainfall totals of 1 to 2 inches are anticipated in a short amount of time with local amounts up to 3 to 5 inches possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Iovino
5 follow-up statements
694 WGUS61 KPHI 170916 FFAPHI Flood Watch National Weather Service Mount Holly NJ 516 AM EDT Sat Jul 17 2021 DEZ001-NJZ001-007>010-012>020-025>027-PAZ054-055-060>062-070-071- 101>106-172130- /O.CON.KPHI.FF.A.0005.210717T1800Z-210718T0600Z/ /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-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 Glassboro, Jim Thorpe, Flemington, Atlantic City, Easton, Philadelphia, Doylestown, Chalfont, Morristown, Jackson, Pennsville, Reading, Lansdale, Norristown, Honey Brook, Mount Holly, Cherry Hill, Moorestown, Freehold, Pottstown, Allentown, Oxford, Wharton State Forest, Kennett Square, Sandy Hook, West Chester, Morrisville, Wilmington, New Brunswick, Media, Trenton, Newton, Washington, Collegeville, Long Beach Island, Camden, Bethlehem, Stroudsburg, Perkasie, and Somerville 516 AM EDT Sat Jul 17 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH LATE TONIGHT... The Flash Flood Watch continues for * Portions of northern Delaware...New Jersey...and Pennsylvania... including the following areas...in northern Delaware...New Castle. In New Jersey...Camden, Coastal Atlantic, Coastal Ocean, Eastern Monmouth, Gloucester, Hunterdon, Mercer, Middlesex, Morris, Northwestern Burlington, Ocean, Salem, Somerset, Southeastern Burlington, Sussex, Warren, and Western Monmouth. In Pennsylvania...Berks, Carbon, Delaware, Eastern Chester, Eastern Montgomery, Lehigh, Lower Bucks, Monroe, Northampton, Philadelphia, Upper Bucks, Western Chester, and Western Montgomery. * From 2 PM EDT this afternoon through late tonight. * Thunderstorms with locally heavy rain are expected to affect eastern Pennsylvania, northern Delaware and New Jersey from Saturday afternoon into Saturday evening. Rainfall totals of 1 to 2 inches are anticipated in a short amount of time with local amounts up to 3 to 5 inches possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Staarmann
457 WGUS61 KPHI 171904 FFAPHI Flood Watch National Weather Service Mount Holly NJ 304 PM EDT Sat Jul 17 2021 DEZ001-NJZ001-007>010-012>020-025>027-PAZ054-055-060>062-070-071- 101>106-180600- /O.CON.KPHI.FF.A.0005.000000T0000Z-210718T0600Z/ /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-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 Glassboro, Jim Thorpe, Flemington, Atlantic City, Easton, Philadelphia, Doylestown, Chalfont, Morristown, Jackson, Pennsville, Reading, Lansdale, Norristown, Honey Brook, Mount Holly, Cherry Hill, Moorestown, Freehold, Pottstown, Allentown, Oxford, Wharton State Forest, Kennett Square, Sandy Hook, West Chester, Morrisville, Wilmington, New Brunswick, Media, Trenton, Newton, Washington, Collegeville, Long Beach Island, Camden, Bethlehem, Stroudsburg, Perkasie, and Somerville 304 PM EDT Sat Jul 17 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 2 AM EDT SUNDAY... The Flash Flood Watch continues for * Portions of northern Delaware...New Jersey...and Pennsylvania... including the following areas...in northern Delaware...New Castle. In New Jersey...Camden, Coastal Atlantic, Coastal Ocean, Eastern Monmouth, Gloucester, Hunterdon, Mercer, Middlesex, Morris, Northwestern Burlington, Ocean, Salem, Somerset, Southeastern Burlington, Sussex, Warren, and Western Monmouth. In Pennsylvania...Berks, Carbon, Delaware, Eastern Chester, Eastern Montgomery, Lehigh, Lower Bucks, Monroe, Northampton, Philadelphia, Upper Bucks, Western Chester, and Western Montgomery. * Until 2 AM EDT Sunday. * Thunderstorms with locally heavy rain are expected to affect eastern Pennsylvania, northern Delaware and New Jersey from this afternoon into tonight. Rainfall totals of 1 to 2 inches are anticipated in a short amount of time with local amounts up to 3 to 5 inches possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ Iovino
653 WGUS61 KPHI 180257 FFAPHI Flood Watch National Weather Service Mount Holly NJ 1057 PM EDT Sat Jul 17 2021 NJZ001-007-PAZ054-055-060>062-101-102-180400- /O.CAN.KPHI.FF.A.0005.000000T0000Z-210718T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Sussex-Warren-Carbon-Monroe-Berks-Lehigh-Northampton-Western Chester- Eastern Chester- Including the cities of Honey Brook, Jim Thorpe, West Chester, Allentown, Newton, Washington, Bethlehem, Stroudsburg, Oxford, Reading, Kennett Square, and Easton 1057 PM EDT Sat Jul 17 2021 ...FLASH FLOOD WATCH IS CANCELED... The Flash Flood Watch for portions of northern New Jersey...and Pennsylvania...including the following areas...in northern New Jersey...Sussex and Warren. In Pennsylvania...Berks, Carbon, Eastern Chester, Lehigh, Monroe, Northampton, and Western Chester has been cancelled. The Flood Watch is canceled. $$ DEZ001-NJZ008>010-012>020-025>027-PAZ070-071-103>106-180600- /O.CON.KPHI.FF.A.0005.000000T0000Z-210718T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Morris-Hunterdon-Somerset-Middlesex-Western Monmouth- Eastern Monmouth-Mercer-Salem-Gloucester-Camden-Northwestern Burlington-Ocean-Coastal Atlantic-Coastal Ocean-Southeastern Burlington-Delaware-Philadelphia-Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Glassboro, Jackson, Flemington, Media, Philadelphia, Doylestown, Chalfont, Morristown, Pennsville, Lansdale, Norristown, Mount Holly, Cherry Hill, Moorestown, Freehold, Pottstown, Sandy Hook, Morrisville, Wilmington, New Brunswick, Trenton, Wharton State Forest, Atlantic City, Collegeville, Long Beach Island, Camden, Perkasie, and Somerville 1057 PM EDT Sat Jul 17 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 2 AM EDT SUNDAY... The Flash Flood Watch continues for * Portions of northern Delaware...New Jersey...and southeast Pennsylvania...including the following areas...in northern Delaware...New Castle. In New Jersey...Camden, Coastal Atlantic, Coastal Ocean, Eastern Monmouth, Gloucester, Hunterdon, Mercer, Middlesex, Morris, Northwestern Burlington, Ocean, Salem, Somerset, Southeastern Burlington, and Western Monmouth. In southeast Pennsylvania...Delaware, Eastern Montgomery, Lower Bucks, Philadelphia, Upper Bucks, and Western Montgomery. * Until 2 AM EDT Sunday. * Thunderstorms with locally heavy rain are expected to affect eastern Pennsylvania, northern Delaware and New Jersey through tonight. Rainfall totals of 1 to 2 inches are anticipated in a short amount of time with local amounts up to 4 to 6 inches possible. $$ BAH
612 WGUS61 KPHI 180358 FFAPHI Flood Watch National Weather Service Mount Holly NJ 1158 PM EDT Sat Jul 17 2021 DEZ001-NJZ016-017-PAZ070-071-103>106-180500- /O.CAN.KPHI.FF.A.0005.000000T0000Z-210718T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Salem-Gloucester-Delaware-Philadelphia-Western Montgomery- Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Glassboro, Chalfont, Media, Morrisville, Wilmington, Collegeville, Doylestown, Philadelphia, Pennsville, Pottstown, Lansdale, Perkasie, and Norristown 1158 PM EDT Sat Jul 17 2021 ...FLASH FLOOD WATCH IS CANCELED... The Flash Flood Watch for portions of northern Delaware...southern New Jersey...and southeast Pennsylvania...including the following areas...in northern Delaware...New Castle. In southern New Jersey... Gloucester and Salem. In southeast Pennsylvania...Delaware, Eastern Montgomery, Lower Bucks, Philadelphia, Upper Bucks, and Western Montgomery has been cancelled. The Flood Watch is canceled. $$ NJZ008>010-012>015-018>020-025>027-180600- /O.CON.KPHI.FF.A.0005.000000T0000Z-210718T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Morris-Hunterdon-Somerset-Middlesex-Western Monmouth-Eastern Monmouth-Mercer-Camden-Northwestern Burlington-Ocean-Coastal Atlantic-Coastal Ocean-Southeastern Burlington- Including the cities of Trenton, Mount Holly, Flemington, Cherry Hill, Moorestown, Wharton State Forest, Atlantic City, Freehold, Long Beach Island, Morristown, Camden, Jackson, Somerville, New Brunswick, and Sandy Hook 1158 PM EDT Sat Jul 17 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 2 AM EDT SUNDAY... The Flash Flood Watch continues for * Portions of central New Jersey...northern New Jersey...northwest New Jersey...and southern New Jersey...including the following areas...in central New Jersey...Eastern Monmouth, Mercer, and Western Monmouth. In northern New Jersey...Middlesex, Morris, and Somerset. In northwest New Jersey...Hunterdon. In southern New Jersey...Camden, Coastal Atlantic, Coastal Ocean, Northwestern Burlington, Ocean, and Southeastern Burlington. * Until 2 AM EDT Sunday. * Thunderstorms with locally heavy rain are expected to affect New Jersey through tonight. Rainfall totals of 1 to 2 inches are anticipated in a short amount of time with local amounts up to 4 to 6 inches possible. $$ BAH
811 WGUS61 KPHI 180549 FFAPHI Flood Watch National Weather Service Mount Holly NJ 149 AM EDT Sun Jul 18 2021 NJZ008>010-012>015-018>020-025>027-180700- /O.CAN.KPHI.FF.A.0005.000000T0000Z-210718T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Morris-Hunterdon-Somerset-Middlesex-Western Monmouth-Eastern Monmouth-Mercer-Camden-Northwestern Burlington-Ocean-Coastal Atlantic-Coastal Ocean-Southeastern Burlington- Including the cities of Trenton, Mount Holly, Flemington, Cherry Hill, Moorestown, Wharton State Forest, Atlantic City, Freehold, Long Beach Island, Morristown, Camden, Jackson, Somerville, New Brunswick, and Sandy Hook 149 AM EDT Sun Jul 18 2021 ...FLASH FLOOD WATCH IS CANCELED... The Flash Flood Watch for portions of central New Jersey...northern New Jersey...northwest New Jersey...and southern New Jersey... including the following areas...in central New Jersey...Eastern Monmouth, Mercer, and Western Monmouth. In northern New Jersey... Middlesex, Morris, and Somerset. In northwest New Jersey... Hunterdon. In southern New Jersey...Camden, Coastal Atlantic, Coastal Ocean, Northwestern Burlington, Ocean, and Southeastern Burlington has been cancelled. The Flash Flood Watch is canceled. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. $$ BAH
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 16, 5:07 PM EDT | Special Weather Statement | PHI | Carbon | 23 min |
| Jul 16, 5:21 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 39 min |
| Jul 16, 5:25 PM EDT | Special Weather Statement | PHI | Monroe | 35 min |
| Jul 16, 5:34 PM EDT | Areal Flood Advisory | PHI | Carbon, Lehigh, Monroe, Northampton | 112 min |
| Jul 16, 5:38 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 20 min |
| Jul 16, 7:42 PM EDT | Special Weather Statement | PHI | Berks | 33 min |
| Jul 16, 2:55 PM EDT | Areal Flood Advisory | PHI | Sussex | 4 hr |
| Jul 16, 5:01 PM EDT | Areal Flood Advisory | PHI | Sussex | 2 hr |
| Jul 16, 5:21 PM EDT | Flash Flood Warning | PHI | Sussex | 2 hr |
| Jul 16, 5:29 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 46 min |
| Jul 16, 6:10 PM EDT | Special Weather Statement | PHI | Warren | 35 min |
| Jul 16, 6:14 PM EDT | Special Weather Statement | PHI | Sussex | 31 min |
| Jul 16, 6:27 PM EDT | Areal Flood Advisory | PHI | Sussex | 59 min |
| Jul 16, 6:46 PM EDT | Special Weather Statement | PHI | Warren | 29 min |
| Jul 16, 7:10 PM EDT | Special Weather Statement | PHI | Warren | 35 min |
Nearby
Flash Flood Watches in New Jersey, 2021Flash Flood Watches in Pennsylvania, 2021Flash Flood Watches in Delaware, 2021Every flash flood watch in 2021
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.