Alert archive / New Jersey / Flood Watches in 2021
Flood Watch 1, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flood watch at Aug 21, 2021, 3:27 AM EDT for 16 counties in New Jersey; 10 counties in Pennsylvania; New Castle County, Delaware. It took effect at Aug 21, 2021, 2:00 PM EDT. It was in force for 42 hr.
The area
The counties it named.
The facts
- Issued
- Aug 21, 2021, 3:27 AM EDT (07:27 UTC)
- In effect from
- Aug 21, 2021, 2:00 PM EDT
- Expired
- Aug 23, 2021, 8:00 AM EDT
- In force
- 42 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Flood severity
- None
All 27 counties
New Castle County, DE, Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cape May 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), 61 km from the middle of the area, began a volume at 07:30 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, 7.5 hours before the alert went out and 199 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
- 244 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 695 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 12 m²/s²
- 0-3 km storm-relative helicity
- 36 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
275 WGUS61 KPHI 210727 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Mount Holly NJ 327 AM EDT Sat Aug 21 2021 DEZ001-NJZ001-007>010-012>027-PAZ060>062-070-071-101>106-211930- /O.NEW.KPHI.FA.A.0001.210821T1800Z-210823T1200Z/ /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-Cape May-Atlantic Coastal Cape May-Coastal Atlantic-Coastal Ocean-Southeastern Burlington-Berks-Lehigh-Northampton-Delaware-Philadelphia-Western Chester-Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Glassboro, Jackson, Flemington, Atlantic City, Easton, Philadelphia, Doylestown, Chalfont, Morristown, Pennsville, Reading, Lansdale, Norristown, Honey Brook, Mount Holly, Ocean City, Cherry Hill, Moorestown, Freehold, Pottstown, Hammonton, Cape May Court House, Oxford, Wharton State Forest, Kennett Square, Sandy Hook, Morrisville, West Chester, Millville, Wilmington, Allentown, New Brunswick, Media, Trenton, Newton, Washington, Collegeville, Long Beach Island, Camden, Bethlehem, Perkasie, and Somerville 327 AM EDT Sat Aug 21 2021 ...FLOOD WATCH IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH MONDAY MORNING... The National Weather Service in Mount Holly has issued a * Flood Watch for portions of northern Delaware...New Jersey...and Pennsylvania...including the following areas...in northern Delaware...New Castle. In New Jersey...Atlantic, Atlantic Coastal Cape May, Camden, Cape May, Coastal Atlantic, Coastal Ocean, Cumberland, Eastern Monmouth, Gloucester, Hunterdon, Mercer, Middlesex, Morris, Northwestern Burlington, Ocean, Salem, Somerset, Southeastern Burlington, Sussex, Warren, and Western Monmouth. In Pennsylvania...Berks, Delaware, Eastern Chester, Eastern Montgomery, Lehigh, Lower Bucks, Northampton, Philadelphia, Upper Bucks, Western Chester, and Western Montgomery. * From 2 PM EDT this afternoon through Monday morning. * Periods of heavy rain will be possible from this afternoon continuing through Sunday night due to the close approach of Henri. Rain amounts of 2 to 4 inches are expected with locally higher amounts possible. * Flash flooding will be possible through this time. In addition, slower rises on rivers and streams will be possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ SFJ
5 follow-up statements
391 WGUS61 KPHI 211852 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Mount Holly NJ 252 PM EDT Sat Aug 21 2021 PAZ054-055-220700- /O.EXA.KPHI.FA.A.0001.000000T0000Z-210823T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Carbon-Monroe- Including the cities of Jim Thorpe and Stroudsburg 252 PM EDT Sat Aug 21 2021 ...FLOOD WATCH IN EFFECT THROUGH MONDAY MORNING... The National Weather Service in Mount Holly has expanded the * Flood Watch to include a portion of northeast Pennsylvania... including the following areas...Carbon and Monroe. * Through Monday morning. * Periods of heavy rain will be possible from this afternoon continuing through Sunday night due to the close approach of Henri. Rain amounts of 2 to 4 inches are expected with locally higher amounts possible. * Flash flooding will be possible through this time. In addition, slower rises on rivers and streams will be possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ DEZ001-NJZ001-007>010-012>027-PAZ060>062-070-071-101>106-220700- /O.CON.KPHI.FA.A.0001.000000T0000Z-210823T1200Z/ /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-Cape May-Atlantic Coastal Cape May-Coastal Atlantic-Coastal Ocean-Southeastern Burlington-Berks-Lehigh-Northampton-Delaware-Philadelphia-Western Chester-Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Glassboro, Jackson, Flemington, Atlantic City, Easton, Philadelphia, Doylestown, Chalfont, Morristown, Pennsville, Reading, Lansdale, Norristown, Honey Brook, Mount Holly, Ocean City, Cherry Hill, Moorestown, Freehold, Pottstown, Hammonton, Cape May Court House, Oxford, Wharton State Forest, Kennett Square, Sandy Hook, Morrisville, West Chester, Millville, Wilmington, Allentown, New Brunswick, Media, Trenton, Newton, Washington, Collegeville, Long Beach Island, Camden, Bethlehem, Perkasie, and Somerville 252 PM EDT Sat Aug 21 2021 ...FLOOD WATCH REMAINS IN EFFECT THROUGH MONDAY MORNING... The Flood Watch continues for * Portions of northern Delaware...New Jersey...and Pennsylvania... including the following areas...in northern Delaware...New Castle. In New Jersey...Atlantic, Atlantic Coastal Cape May, Camden, Cape May, Coastal Atlantic, Coastal Ocean, Cumberland, Eastern Monmouth, Gloucester, Hunterdon, Mercer, Middlesex, Morris, Northwestern Burlington, Ocean, Salem, Somerset, Southeastern Burlington, Sussex, Warren, and Western Monmouth. In Pennsylvania...Berks, Delaware, Eastern Chester, Eastern Montgomery, Lehigh, Lower Bucks, Northampton, Philadelphia, Upper Bucks, Western Chester, and Western Montgomery. * Through Monday morning. * Periods of heavy rain will be possible from this afternoon continuing through Sunday night due to the close approach of Henri. Rain amounts of 2 to 4 inches are expected with locally higher amounts possible. * Flash flooding will be possible through this time. In addition, slower rises on rivers and streams will be possible. $$ Fitzsimmons
299 WGUS61 KPHI 220551 FFAPHI Flood Watch National Weather Service Mount Holly NJ 151 AM EDT Sun Aug 22 2021 DEZ001-NJZ001-007>010-012>027-PAZ060>062-070-071-101>106-222100- /O.CON.KPHI.FA.A.0001.000000T0000Z-210823T1200Z/ /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-Cape May-Atlantic Coastal Cape May-Coastal Atlantic-Coastal Ocean-Southeastern Burlington-Berks-Lehigh-Northampton-Delaware-Philadelphia-Western Chester-Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Glassboro, Jackson, Flemington, Atlantic City, Easton, Philadelphia, Doylestown, Chalfont, Morristown, Pennsville, Reading, Lansdale, Norristown, Honey Brook, Mount Holly, Ocean City, Cherry Hill, Moorestown, Freehold, Pottstown, Hammonton, Cape May Court House, Oxford, Wharton State Forest, Kennett Square, Sandy Hook, Morrisville, West Chester, Millville, Wilmington, Allentown, New Brunswick, Media, Trenton, Newton, Washington, Collegeville, Long Beach Island, Camden, Bethlehem, Perkasie, and Somerville 151 AM EDT Sun Aug 22 2021 ...FLOOD WATCH REMAINS IN EFFECT THROUGH MONDAY MORNING... The Flood Watch continues for * Portions of northern Delaware...New Jersey...and Pennsylvania... including the following areas...in northern Delaware...New Castle. In New Jersey...Atlantic, Atlantic Coastal Cape May, Camden, Cape May, Coastal Atlantic, Coastal Ocean, Cumberland, Eastern Monmouth, Gloucester, Hunterdon, Mercer, Middlesex, Morris, Northwestern Burlington, Ocean, Salem, Somerset, Southeastern Burlington, Sussex, Warren, and Western Monmouth. In Pennsylvania...Berks, Delaware, Eastern Chester, Eastern Montgomery, Lehigh, Lower Bucks, Northampton, Philadelphia, Upper Bucks, Western Chester, and Western Montgomery. * Through Monday morning. * Periods of heavy rain are expected through Sunday night as Hurricane Henri passes to our east. Rainfall amounts of 2 to 4 inches are forecast with locally higher amounts possible. * Flash flooding may occur. Also, there may be significant within banks rises or minor flooding on some of the main stem rivers and large creeks. $$ PAZ054-055-222100- /O.CON.KPHI.FA.A.0001.000000T0000Z-210823T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Carbon-Monroe- Including the cities of Jim Thorpe and Stroudsburg 151 AM EDT Sun Aug 22 2021 ...FLOOD WATCH REMAINS IN EFFECT THROUGH MONDAY MORNING... The Flood Watch continues for * A portion of northeast Pennsylvania...including the following areas...Carbon and Monroe. * Through Monday morning. * Periods of heavy rain are expected through Sunday night as Hurricane Henri passes to our east. Rainfall amounts of 2 to 4 inches are forecast with locally higher amounts possible. * Flash flooding may occur. Also, there may be significant within banks rises or minor flooding on some of the main stem rivers and large creeks. $$ Iovino
386 WGUS61 KPHI 221903 FFAPHI Flood Watch National Weather Service Mount Holly NJ 303 PM EDT Sun Aug 22 2021 DEZ001-NJZ001-007>010-012>027-PAZ054-055-060>062-070-071-101>106- 230315- /O.CON.KPHI.FA.A.0001.000000T0000Z-210823T1200Z/ /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-Cape May- Atlantic Coastal Cape May-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 Wilmington, Newton, Washington, Morristown, Flemington, Somerville, New Brunswick, Freehold, Sandy Hook, Trenton, Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Jackson, Millville, Hammonton, Cape May Court House, Ocean City, Atlantic City, Long Beach Island, Wharton State Forest, Jim Thorpe, Stroudsburg, Reading, Allentown, Bethlehem, Easton, Media, Philadelphia, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 303 PM EDT Sun Aug 22 2021 ...FLOOD WATCH REMAINS IN EFFECT THROUGH MONDAY MORNING... The Flood Watch continues for * Portions of northern Delaware, New Jersey, and Pennsylvania, including the following areas, in northern Delaware, New Castle. In New Jersey, Atlantic, Atlantic Coastal Cape May, Camden, Cape May, Coastal Atlantic, Coastal Ocean, Cumberland, 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. * Through Monday morning * Periods of heavy rain are expected through tonight but should become focused primarily over northeast Pennsylvania into northern New Jersey where another 2 to 4 inches of rain is generally expected. This will lead to a continuing threat for flooding and flash flooding. Farther south, additional rain amounts over southeast Pennsylvania into central and southern New Jersey should generally be 1 to 2 inches or less. However this is in addition to rain that's already fallen and led to ongoing flooding in places. * Flash flooding may occur. Also, rising river levels may continue to result in flooding on some of the main stem rivers and large creeks. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flood Watch means there is a potential for flooding based on current forecasts. You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$
908 WGUS61 KPHI 230045 FFAPHI Flood Watch National Weather Service Mount Holly NJ 845 PM EDT Sun Aug 22 2021 DEZ001-NJZ016>027-230145- /O.CAN.KPHI.FA.A.0001.000000T0000Z-210823T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Salem-Gloucester-Camden-Northwestern Burlington-Ocean- Cumberland-Atlantic-Cape May-Atlantic Coastal Cape May-Coastal Atlantic-Coastal Ocean-Southeastern Burlington- Including the cities of Glassboro, Mount Holly, Ocean City, Cherry Hill, Moorestown, Millville, Wilmington, Long Beach Island, Atlantic City, Camden, Hammonton, Cape May Court House, Jackson, Pennsville, and Wharton State Forest 845 PM EDT Sun Aug 22 2021 ...FLOOD WATCH IS CANCELLED... The Flood Watch for portions of northern Delaware...and southern New Jersey...including the following areas...in northern Delaware...New Castle. In southern New Jersey...Atlantic, Atlantic Coastal Cape May, Camden, Cape May, Coastal Atlantic, Coastal Ocean, Cumberland, Gloucester, Northwestern Burlington, Ocean, Salem, and Southeastern Burlington has been cancelled. The Flood Watch is cancelled. Heavy rain will stay north of the area. $$ NJZ001-007>010-012>015-PAZ060>062-070-071-101>106-231200- /O.CON.KPHI.FA.A.0001.000000T0000Z-210823T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-Western Monmouth- Eastern Monmouth-Mercer-Berks-Lehigh-Northampton-Delaware- Philadelphia-Western Chester-Eastern Chester-Western Montgomery- Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Sandy Hook, Flemington, Allentown, Philadelphia, Doylestown, Chalfont, Morristown, Honey Brook, Lansdale, Norristown, Reading, Freehold, Pottstown, Media, Oxford, Kennett Square, Easton, West Chester, Morrisville, New Brunswick, Trenton, Newton, Washington, Collegeville, Bethlehem, Perkasie, and Somerville 845 PM EDT Sun Aug 22 2021 ...FLOOD WATCH REMAINS IN EFFECT UNTIL 8 AM EDT MONDAY... The Flood Watch continues for * Portions of New Jersey...and Pennsylvania...including the following areas...in New Jersey...Eastern Monmouth, Hunterdon, Mercer, Middlesex, Morris, Somerset, Sussex, Warren, and Western Monmouth. In Pennsylvania...Berks, Delaware, Eastern Chester, Eastern Montgomery, Lehigh, Lower Bucks, Northampton, Philadelphia, Upper Bucks, Western Chester, and Western Montgomery. * Until 8 AM EDT Monday. * Periods of heavy rain will continue tonight as Tropical Depression Henri lifts to the north and east. Rainfall amounts of 2 to 4 inches are expected with locally higher amounts possible. * Flash flooding may occur. Also, there may be significant within banks rises or minor flooding on some of the main stem rivers and large creeks. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ PAZ054-055-231200- /O.CON.KPHI.FA.A.0001.000000T0000Z-210823T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Carbon-Monroe- Including the cities of Jim Thorpe and Stroudsburg 845 PM EDT Sun Aug 22 2021 ...FLOOD WATCH REMAINS IN EFFECT UNTIL 8 AM EDT MONDAY... The Flood Watch continues for * A portion of northeast Pennsylvania...including the following areas...Carbon and Monroe. * Until 8 AM EDT Monday. * Periods of heavy rain will continue tonight as Tropical Depression Henri lifts to the north and east. Rainfall amounts of 2 to 4 inches are expected with locally higher amounts possible. * Flash flooding may occur. Also, there may be significant within banks rises or minor flooding on some of the main stem rivers and large creeks. $$ MPS
206 WGUS61 KPHI 231158 FFAPHI Flood Watch National Weather Service Mount Holly NJ 758 AM EDT Mon Aug 23 2021 NJZ001-007>010-012>015-PAZ054-055-060>062-070-071-101>106-231300- /O.EXP.KPHI.FA.A.0001.000000T0000Z-210823T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-Western Monmouth- Eastern Monmouth-Mercer-Carbon-Monroe-Berks-Lehigh-Northampton- Delaware-Philadelphia-Western Chester-Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Sandy Hook, Jim Thorpe, Flemington, Media, Philadelphia, Doylestown, Chalfont, Morristown, Honey Brook, Lansdale, Norristown, Reading, Freehold, Pottstown, Allentown, Oxford, Kennett Square, Easton, West Chester, Morrisville, New Brunswick, Trenton, Newton, Washington, Collegeville, Bethlehem, Stroudsburg, Perkasie, and Somerville 758 AM EDT Mon Aug 23 2021 ...FLOOD WATCH WILL EXPIRE AT 8 AM EDT THIS MORNING... The Flood Watch for portions of New Jersey...and Pennsylvania... including the following areas...in New Jersey...Eastern Monmouth, Hunterdon, Mercer, Middlesex, Morris, Somerset, Sussex, Warren, and Western Monmouth. In Pennsylvania...Berks, Carbon, Delaware, Eastern Chester, Eastern Montgomery, Lehigh, Lower Bucks, Monroe, Northampton, Philadelphia, Upper Bucks, Western Chester, and Western Montgomery will expire at 8 AM EDT this morning. Although the Flood Watch will be allowed to expire, please continue to heed remaining road closures due to existing flooding. $$ Kruzdlo
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 8:49 PM EDT | Small Craft Advisory | PHI | 49 hr | |
| Aug 20, 11:02 PM EDT | Tropical Storm Warning | PHI | Middlesex, Monmouth | 36 hr |
| Aug 21, 3:26 AM EDT | Coastal Flood Advisory | PHI | Cape May, Middlesex, Monmouth, Ocean | 22 hr |
| Aug 21, 3:09 AM EDT | Areal Flood Advisory | PHI | Sussex | 3 hr |
Nearby
Flood Watches in New Jersey, 2021Flood Watches in Pennsylvania, 2021Flood Watches in Delaware, 2021Every 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.