Alert archive / New Jersey / Flash Flood Watches in 2018
Flash Flood Watch 12, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood watch at Aug 11, 2018, 3:24 AM EDT for 4 states. It was in force for 20 hr.
The area
The counties it named.
The facts
- Issued
- Aug 11, 2018, 3:24 AM EDT (07:24 UTC)
- Expired
- Aug 11, 2018, 11:25 PM EDT
- In force
- 20 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Flood severity
- None
All 30 counties
Kent County, DE, New Castle County, DE, Cecil County, MD, Kent County, MD, Queen Anne's County, MD, 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), 67 km from the middle of the area, began a volume at 07:26 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, 7.4 hours before the alert went out and 212 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
- 155 J/kg
- Mixed-layer CIN
- -54 J/kg
- Mixed-layer LCL
- 1448 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 53 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted.
856 WGUS61 KPHI 110724 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Mount Holly NJ 324 AM EDT Sat Aug 11 2018 DEZ001-NJZ001-007>010-012>019-PAZ054-055-060>062-070-071-101>106- 111700- /O.NEW.KPHI.FF.A.0012.180811T0724Z-180812T0500Z/ /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-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, 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 324 AM EDT Sat Aug 11 2018 ...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT... 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, Eastern Monmouth, Gloucester, Hunterdon, Mercer, Middlesex, Morris, Northwestern Burlington, Salem, 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. * Through late tonight * Showers and thunderstorms producing heavy downpours will develop this morning and continue through tonight. The trend appears for there to be one round early this morning, followed by a potential lull in the heavy rain from late morning through early afternoon. Another round of slow moving showers and thunderstorms will develop this afternoon through this evening. Although rainfall amounts area wide will generally average less than one inch, there is the potential for locally heavy rainfall of 2 to 3 inches, possibly more, where thunderstorms train over the same location. The main area of risk for the potential flooding will be along and north of the I-95 urban corridor. * Heavy rainfall within a short period of time can lead to rapidly rising water and flash flooding, particularly in urban areas, and along small creeks and streams. The ground remains fairly saturated due to recent heavy rains over the past several weeks. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that there is the potential for flash flooding which can be life-threatening. Heavy rain is expected to occur over a short period of time. Rapidly rising flood waters may quickly inundate roadways and areas of poor drainage. Streams and creeks could leave their banks, flooding nearby properties. Please monitor the forecast, especially if you live in a location that is prone to flooding. Be prepared to take action if a flash flood warning is issued for your area. && $$ MPS
3 follow-up statements
921 WGUS61 KPHI 111443 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Mount Holly NJ 1043 AM EDT Sat Aug 11 2018 DEZ002-MDZ008-012-015-NJZ020>022-025>027-120500- /O.EXA.KPHI.FF.A.0012.000000T0000Z-180812T0500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Kent-Cecil-Kent MD-Queen Annes-Ocean-Cumberland-Atlantic- Coastal Atlantic-Coastal Ocean-Southeastern Burlington- Including the cities of Dover, Elkton, Chestertown, Centreville, Jackson, Millville, Hammonton, Atlantic City, Long Beach Island, and Wharton State Forest 1043 AM EDT Sat Aug 11 2018 ...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT... The National Weather Service in Mount Holly has expanded the * Flash Flood Watch to include portions of central Delaware, northeast Maryland, and southern New Jersey, including the following areas, in central Delaware, Kent. In northeast Maryland, Cecil, Kent MD, and Queen Annes. In southern New Jersey, Atlantic, Coastal Atlantic, Coastal Ocean, Cumberland, Ocean, and Southeastern Burlington. * Through late tonight * Showers and thunderstorms producing heavy downpours will develop again this afternoon and continue through tonight. Although rainfall amounts area wide will generally average less than one inch, there is the potential for locally heavy rainfall of 2 to 3 inches, possibly more, where thunderstorms train over the same location. * Heavy rainfall within a short period of time can lead to rapidly rising water and flash flooding, particularly in urban areas, and along small creeks and streams. The ground remains fairly saturated due to recent heavy rains over the past several weeks. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that there is the potential for flash flooding which can be life-threatening. Heavy rain is expected to occur over a short period of time. Rapidly rising flood waters may quickly inundate roadways and areas of poor drainage. Streams and creeks could leave their banks, flooding nearby properties. Please monitor the forecast, especially if you live in a location that is prone to flooding. Be prepared to take action if a flash flood warning is issued for your area. && $$ DEZ001-NJZ001-007>010-012>019-PAZ054-055-060>062-070-071-101>106- 120500- /O.CON.KPHI.FF.A.0012.000000T0000Z-180812T0500Z/ /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-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, 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 1043 AM EDT Sat Aug 11 2018 ...FLASH FLOOD WATCH REMAINS IN EFFECT 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, Eastern Monmouth, Gloucester, Hunterdon, Mercer, Middlesex, Morris, Northwestern Burlington, Salem, 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. * Through late tonight * Showers and thunderstorms producing heavy downpours will develop again this afternoon and continue through tonight. Although rainfall amounts area wide will generally average less than one inch, there is the potential for locally heavy rainfall of 2 to 3 inches, possibly more, where thunderstorms train over the same location. * Heavy rainfall within a short period of time can lead to rapidly rising water and flash flooding, particularly in urban areas, and along small creeks and streams. The ground remains fairly saturated due to recent heavy rains over the past several weeks. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that there is the potential for flash flooding which can be life-threatening. Heavy rain is expected to occur over a short period of time. Rapidly rising flood waters may quickly inundate roadways and areas of poor drainage. Streams and creeks could leave their banks, flooding nearby properties. Please monitor the forecast, especially if you live in a location that is prone to flooding. Be prepared to take action if a flash flood warning is issued for your area. && $$
282 WGUS61 KPHI 120137 FFAPHI Flood Watch National Weather Service Mount Holly NJ 937 PM EDT Sat Aug 11 2018 NJZ001-007>010-012-015-PAZ054-055-060>062-070-071-101>106-120245- /O.CAN.KPHI.FF.A.0012.000000T0000Z-180812T0500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-Mercer-Carbon- Monroe-Berks-Lehigh-Northampton-Delaware-Philadelphia- Western Chester-Eastern Chester-Western Montgomery- Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Newton, Washington, Morristown, Flemington, Somerville, New Brunswick, Trenton, Jim Thorpe, Stroudsburg, Reading, Allentown, Bethlehem, Easton, Media, Philadelphia, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 937 PM EDT Sat Aug 11 2018 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of New Jersey and Pennsylvania has been cancelled. The heaviest rain has pushed south and east of this area so no additional flash flooding is expected tonight. However areas of lingering standing water along with high stream flows can be expected into tonight for areas that experienced flash flooding earlier today. $$ DEZ001-002-MDZ008-012-015-NJZ013-014-016>022-025>027-120500- /O.CON.KPHI.FF.A.0012.000000T0000Z-180812T0500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Kent-Cecil-Kent MD-Queen Annes-Western Monmouth- Eastern Monmouth-Salem-Gloucester-Camden-Northwestern Burlington- Ocean-Cumberland-Atlantic-Coastal Atlantic-Coastal Ocean- Southeastern Burlington- Including the cities of Wilmington, Dover, Elkton, Chestertown, Centreville, Freehold, Sandy Hook, Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Jackson, Millville, Hammonton, Atlantic City, Long Beach Island, and Wharton State Forest 937 PM EDT Sat Aug 11 2018 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 1 AM EDT SUNDAY... The Flash Flood Watch continues for * Portions of Delaware, northeast Maryland, and New Jersey, including the following areas, in Delaware, Kent and New Castle. In northeast Maryland, Cecil, Kent MD, and Queen Annes. In New Jersey, Atlantic, Camden, Coastal Atlantic, Coastal Ocean, Cumberland, Eastern Monmouth, Gloucester, Northwestern Burlington, Ocean, Salem, Southeastern Burlington, and Western Monmouth. * Until 1 AM EDT Sunday * Showers and thunderstorms producing heavy downpours will continue to affect the area this evening before moving out west to east after midnight. Rainfall rates may exceed over 2 inches per hour in the heaviest storms leading to flash flooding. * Heavy rainfall within a short period of time can lead to rapidly rising water and flash flooding, particularly in urban areas, and along small creeks and streams. The ground remains fairly saturated due to recent heavy rains over the past several weeks. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that there is the potential for flash flooding which can be life-threatening. Heavy rain is expected to occur over a short period of time. Rapidly rising flood waters may quickly inundate roadways and areas of poor drainage. Streams and creeks could leave their banks, flooding nearby properties. Please monitor the forecast, especially if you live in a location that is prone to flooding. Be prepared to take action if a flash flood warning is issued for your area. && $$ Fitzsimmons
945 WGUS61 KPHI 120325 FFAPHI Flood Watch National Weather Service Mount Holly NJ 1125 PM EDT Sat Aug 11 2018 DEZ001-002-MDZ008-012-015-NJZ013-014-016>022-025>027-120430- /O.CAN.KPHI.FF.A.0012.000000T0000Z-180812T0500Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Kent-Cecil-Kent MD-Queen Annes-Western Monmouth- Eastern Monmouth-Salem-Gloucester-Camden-Northwestern Burlington- Ocean-Cumberland-Atlantic-Coastal Atlantic-Coastal Ocean- Southeastern Burlington- Including the cities of Wilmington, Dover, Elkton, Chestertown, Centreville, Freehold, Sandy Hook, Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Jackson, Millville, Hammonton, Atlantic City, Long Beach Island, and Wharton State Forest 1125 PM EDT Sat Aug 11 2018 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of Delaware, northeast Maryland, and New Jersey has been cancelled. The heaviest rainfall has ended, and flash flooding is no longer expected to be a threat tonight. More chances for showers and storms exist Sunday through much of next week. $$ CMS
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 4:19 PM EDT | Areal Flood Advisory | PHI | Cecil | 3 hr |
| Aug 11, 4:19 PM EDT | Severe Thunderstorm Warning | PHI | Cecil | 29 min |
| Aug 11, 5:20 PM EDT | Areal Flood Advisory | PHI | Cecil, Kent, Queen Anne's | 4 hr |
| Aug 11, 5:24 PM EDT | Special Weather Statement | PHI | Cecil | 36 min |
| Aug 11, 6:08 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's | 52 min |
| Aug 11, 6:12 PM EDT | Flash Flood Warning | PHI | Cecil, Kent, Queen Anne's | 3 hr |
| Aug 11, 6:45 PM EDT | Flash Flood Warning | PHI | Caroline, Queen Anne's, Talbot | 5 hr |
| Aug 11, 6:55 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 50 min |
| Aug 11, 7:42 PM EDT | Special Weather Statement | PHI | Caroline, Queen Anne's, Talbot | 48 min |
| Aug 11, 2:25 AM EDT | Special Weather Statement | PHI | Berks | 65 min |
| Aug 11, 3:26 AM EDT | Special Weather Statement | PHI | Berks | 64 min |
| Aug 11, 4:17 AM EDT | Areal Flood Advisory | PHI | Berks | 4 hr |
| Aug 11, 4:26 AM EDT | Coastal Flood Advisory | PHI | Bucks, Delaware, Philadelphia | 24 hr |
| Aug 11, 5:19 AM EDT | Flash Flood Warning | PHI | Berks | 3 hr |
| Aug 11, 5:27 AM EDT | Areal Flood Advisory | PHI | Northampton | 4 hr |
| Aug 11, 6:06 AM EDT | Areal Flood Advisory | PHI | Bucks, Northampton | 6 hr |
| Aug 11, 6:31 AM EDT | Areal Flood Advisory | PHI | Bucks | 7 hr |
| Aug 11, 12:16 PM EDT | Special Weather Statement | PHI | Chester | 29 min |
| Aug 11, 12:48 PM EDT | Areal Flood Advisory | PHI | Chester | 3 hr |
| Aug 11, 1:20 PM EDT | Areal Flood Advisory | PHI | Chester, Montgomery | 3 hr |
| Aug 11, 1:33 PM EDT | Flash Flood Warning | PHI | Chester, Montgomery | 4 hr |
| Aug 11, 1:40 PM EDT | Flash Flood Warning | PHI | Chester | 4 hr |
| Aug 11, 1:48 PM EDT | Flash Flood Warning | PHI | Delaware, Philadelphia | 4 hr |
| Aug 11, 1:51 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 39 min |
| Aug 11, 2:00 PM EDT | Flash Flood Warning | PHI | Bucks, Lehigh, Northampton | 9 hr |
| Aug 11, 2:14 PM EDT | Flash Flood Warning | PHI | Bucks | 3 hr |
| Aug 11, 2:26 PM EDT | Special Weather Statement | PHI | Bucks, Philadelphia | 34 min |
| Aug 11, 2:42 PM EDT | Special Weather Statement | PHI | Bucks | 33 min |
| Aug 11, 3:06 PM EDT | Flash Flood Warning | PHI | Northampton | 4 hr |
| Aug 11, 3:50 PM EDT | Areal Flood Advisory | PHI | Berks, Montgomery | 115 min |
| Aug 11, 4:47 PM EDT | Special Weather Statement | PHI | Montgomery | 28 min |
| Aug 11, 4:52 PM EDT | Areal Flood Advisory | PHI | Carbon, Lehigh | 2 hr |
| Aug 11, 5:36 PM EDT | Areal Flood Warning | PHI | Bucks | 4 hr |
| Aug 11, 5:58 PM EDT | Areal Flood Advisory | PHI | Chester, Delaware, Montgomery, Philadelphia | 5 hr |
| Aug 11, 6:13 PM EDT | Special Weather Statement | PHI | Chester | 32 min |
| Aug 11, 7:16 AM EDT | Flash Flood Warning | PHI | Middlesex, Somerset | 4 hr |
| Aug 11, 10:49 AM EDT | Areal Flood Advisory | PHI | Middlesex, Somerset | 3 hr |
| Aug 11, 11:29 AM EDT | Areal Flood Advisory | PHI | Atlantic | 4 hr |
| Aug 11, 11:46 AM EDT | Special Marine Warning | PHI | 119 min | |
| Aug 11, 11:55 AM EDT | Special Weather Statement | PHI | Burlington | 35 min |
| Aug 11, 12:27 PM EDT | Areal Flood Advisory | PHI | Burlington, Camden, Gloucester, Ocean | 4 hr |
| Aug 11, 12:39 PM EDT | Special Weather Statement | PHI | Ocean | 36 min |
| Aug 11, 12:55 PM EDT | Special Marine Warning | PHI | 65 min | |
| Aug 11, 1:07 PM EDT | Flash Flood Warning | PHI | Atlantic, Cape May | 4 hr |
| Aug 11, 1:26 PM EDT | Special Marine Warning | PHI | 2 hr | |
| Aug 11, 1:42 PM EDT | Special Marine Warning | PHI | 2 hr | |
| Aug 11, 2:05 PM EDT | Special Weather Statement | PHI | Cape May | 25 min |
| Aug 11, 2:06 PM EDT | Areal Flood Advisory | PHI | Burlington, Camden, Gloucester | 3 hr |
| Aug 11, 2:19 PM EDT | Special Marine Warning | PHI | 86 min | |
| Aug 11, 2:20 PM EDT | Areal Flood Advisory | PHI | Cape May, Cumberland | 3 hr |
| Aug 11, 2:30 PM EDT | Flash Flood Warning | PHI | Hunterdon, Morris, Warren | 3 hr |
| Aug 11, 2:46 PM EDT | Flash Flood Warning | PHI | Hunterdon, Mercer, Middlesex, Morris, Somerset | 3 hr |
| Aug 11, 2:58 PM EDT | Special Weather Statement | PHI | Cumberland | 47 min |
| Aug 11, 3:13 PM EDT | Special Weather Statement | PHI | Hunterdon | 47 min |
| Aug 11, 3:23 PM EDT | Areal Flood Advisory | PHI | Morris, Sussex | 3 hr |
| Aug 11, 3:24 PM EDT | Special Weather Statement | PHI | Atlantic, Cumberland | 51 min |
| Aug 11, 3:32 PM EDT | Flash Flood Warning | PHI | Atlantic | 3 hr |
| Aug 11, 3:47 PM EDT | Flash Flood Warning | PHI | Morris | 3 hr |
| Aug 11, 4:11 PM EDT | Special Marine Warning | PHI | 2 hr | |
| Aug 11, 4:28 PM EDT | Special Marine Warning | PHI | 2 hr | |
| Aug 11, 5:00 PM EDT | Areal Flood Advisory | PHI | Gloucester, Salem | 3 hr |
| Aug 11, 5:26 PM EDT | Areal Flood Advisory | PHI | Hunterdon, Morris, Warren | 4 hr |
| Aug 11, 6:11 PM EDT | Special Marine Warning | PHI | 2 hr | |
| Aug 11, 7:35 PM EDT | Areal Flood Advisory | PHI | Atlantic, Cumberland | 3 hr |
| Aug 11, 7:46 PM EDT | River Flood Warning | PHI | Essex, Morris, Passaic | 4 days |
| Aug 11, 1:23 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 37 min |
Nearby
Flash Flood Watches in New Jersey, 2018Flash Flood Watches in Pennsylvania, 2018Flash Flood Watches in Maryland, 2018Every flash flood watch in 2018
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.