Alert archive / New Jersey / Flash Flood Watches in 2018
Flash Flood Watch 14, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood watch at Aug 18, 2018, 3:16 AM EDT for 4 states. It took effect at Aug 18, 2018, 2:00 PM EDT. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Aug 18, 2018, 3:16 AM EDT (07:16 UTC)
- In effect from
- Aug 18, 2018, 2:00 PM EDT
- Expired
- Aug 18, 2018, 11:29 PM EDT
- In force
- 9 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Flood severity
- None
All 25 counties
New Castle County, DE, Cecil County, MD, 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), 70 km from the middle of the area, began a volume at 07:17 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, 7.3 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.
- Mixed-layer CAPE
- 802 J/kg
- Mixed-layer CIN
- -65 J/kg
- Mixed-layer LCL
- 900 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 59 m²/s²
- 0-3 km storm-relative helicity
- 119 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
232 WGUS61 KPHI 180716 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Mount Holly NJ 316 AM EDT Sat Aug 18 2018 DEZ001-MDZ008-NJZ001-007>010-012>020-026-027-PAZ054-055-060>062- 070-071-101>106-190015- /O.NEW.KPHI.FF.A.0014.180818T1800Z-180819T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Cecil-Sussex-Warren-Morris-Hunterdon-Somerset- Middlesex-Western Monmouth-Eastern Monmouth-Mercer-Salem- Gloucester-Camden-Northwestern Burlington-Ocean-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, Elkton, Newton, Washington, Morristown, Flemington, Somerville, New Brunswick, Freehold, Sandy Hook, Trenton, Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Jackson, 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 316 AM EDT Sat Aug 18 2018 ...FLASH FLOOD WATCH IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH THIS EVENING... The National Weather Service in Mount Holly has issued a * Flash Flood Watch for portions of northern Delaware, northeast Maryland, New Jersey, and Pennsylvania, including the following areas, in northern Delaware, New Castle. In northeast Maryland, Cecil. In New Jersey, Camden, 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 this evening * Several rounds of heavy showers and thunderstorms will affect the area through this evening. The heaviest rainfall is expected later this afternoon into this evening as a cold front moves across the area. Those areas that received heavy rainfall on Friday will be the most susceptible 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. && $$
3 follow-up statements
643 WGUS61 KPHI 181939 FFAPHI Flood Watch National Weather Service Mount Holly NJ 339 PM EDT Sat Aug 18 2018 DEZ001-MDZ008-NJZ001-007>010-012>020-026-027-PAZ054-055-060>062- 070-071-101>106-190400- /O.CON.KPHI.FF.A.0014.000000T0000Z-180819T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Cecil-Sussex-Warren-Morris-Hunterdon-Somerset- Middlesex-Western Monmouth-Eastern Monmouth-Mercer-Salem- Gloucester-Camden-Northwestern Burlington-Ocean-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, Elkton, Newton, Washington, Morristown, Flemington, Somerville, New Brunswick, Freehold, Sandy Hook, Trenton, Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Jackson, 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 339 PM EDT Sat Aug 18 2018 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL MIDNIGHT EDT TONIGHT... The Flash Flood Watch continues for * Portions of northern Delaware, northeast Maryland, New Jersey, and Pennsylvania, including the following areas, in northern Delaware, New Castle. In northeast Maryland, Cecil. In New Jersey, Camden, 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 midnight EDT tonight * Several rounds of heavy showers and thunderstorms will affect the area through this evening. The heaviest rainfall is expected later this afternoon into this evening as a cold front moves across the area. Those areas that received heavy rainfall on Friday will be the most susceptible 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. && $$
135 WGUS61 KPHI 190047 FFAPHI Flood Watch National Weather Service Mount Holly NJ 847 PM EDT Sat Aug 18 2018 DEZ001-MDZ008-NJZ001-007>010-012>015-PAZ054-055-060>062-070-071- 101>106-190200- /O.CAN.KPHI.FF.A.0014.000000T0000Z-180819T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Cecil-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 Wilmington, Elkton, Newton, Washington, Morristown, Flemington, Somerville, New Brunswick, Freehold, Sandy Hook, 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 847 PM EDT Sat Aug 18 2018 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of northern Delaware, northeast Maryland, New Jersey, and Pennsylvania has been cancelled. A front has crossed much of the area and flash flooding is no longer expected. $$ NJZ016>020-026-027-190400- /O.CON.KPHI.FF.A.0014.000000T0000Z-180819T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Salem-Gloucester-Camden-Northwestern Burlington-Ocean- Coastal Ocean-Southeastern Burlington- Including the cities of Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Jackson, Long Beach Island, and Wharton State Forest 847 PM EDT Sat Aug 18 2018 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL MIDNIGHT EDT TONIGHT... The Flash Flood Watch continues for * A portion of southern New Jersey, including the following counties, Burlington, Ocean, Camden, Gloucester and Salem. * Until midnight EDT tonight * A few rounds of heavy showers and thunderstorms will affect the area through this evening as a front crosses the region. Those areas that received heavy rainfall on Friday will be the most susceptible to flash flooding. * Heavy rainfall within a short period of time can lead to rapidly rising water and flash flooding, particularly in urban areas, and along small creeks and streams. The ground remains fairly saturated due to recent heavy rains over the past several weeks. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that there is the potential for flash flooding which can be life-threatening. Heavy rain is expected to occur over a short period of time. Rapidly rising flood waters may quickly inundate roadways and areas of poor drainage. Streams and creeks could leave their banks, flooding nearby properties. Please monitor the forecast, especially if you live in a location that is prone to flooding. Be prepared to take action if a flash flood warning is issued for your area. && $$
728 WGUS61 KPHI 190329 FFAPHI Flood Watch National Weather Service Mount Holly NJ 1129 PM EDT Sat Aug 18 2018 NJZ016>020-026-027-190430- /O.CAN.KPHI.FF.A.0014.000000T0000Z-180819T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Salem-Gloucester-Camden-Northwestern Burlington-Ocean- Coastal Ocean-Southeastern Burlington- Including the cities of Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Jackson, Long Beach Island, and Wharton State Forest 1129 PM EDT Sat Aug 18 2018 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for a portion of southern New Jersey has been cancelled. The heavy rain threat has diminished and the flash flooding threat has decreased as well. Therefore the Flash Flood Watch has been cancelled. However, there will still be scattered showers or thunderstorms for some areas overnight. $$ Robertson
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 8:04 PM EDT | Special Weather Statement | PHI | Monroe | 41 min |
| Aug 17, 8:17 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 43 min |
| Aug 17, 8:54 PM EDT | Special Weather Statement | PHI | Carbon, Monroe | 36 min |
| Aug 17, 10:59 PM EDT | Areal Flood Advisory | PHI | Bucks | 75 min |
| Aug 18, 12:56 AM EDT | Areal Flood Advisory | PHI | Chester, Delaware | 4 hr |
| Aug 18, 3:20 PM EDT | Special Weather Statement | PHI | Chester | 40 min |
| Aug 18, 4:33 PM EDT | Special Weather Statement | PHI | Delaware | 42 min |
| Aug 18, 4:54 PM EDT | Special Weather Statement | PHI | Philadelphia | 21 min |
| Aug 17, 8:47 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer, Middlesex, Morris, Somerset, Sussex | 43 min |
| Aug 17, 8:48 PM EDT | Special Weather Statement | PHI | Sussex | 27 min |
| Aug 17, 9:26 PM EDT | Special Weather Statement | PHI | Mercer, Middlesex, Somerset | 34 min |
| Aug 17, 11:25 PM EDT | Special Weather Statement | PHI | Somerset | 35 min |
| Aug 17, 11:30 PM EDT | Flash Flood Warning | PHI | Hunterdon, Middlesex, Morris, Somerset | 4 hr |
| Aug 17, 11:41 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Morris, Somerset | 34 min |
| Aug 17, 11:52 PM EDT | Special Weather Statement | PHI | Middlesex | 23 min |
| Aug 18, 2:37 AM EDT | Special Weather Statement | PHI | Ocean | 23 min |
| Aug 18, 2:38 AM EDT | Special Marine Warning | PHI | 52 min | |
| Aug 18, 2:41 AM EDT | Special Weather Statement | PHI | Atlantic, Cumberland | 34 min |
| Aug 18, 2:46 AM EDT | Severe Thunderstorm Warning | PHI | Ocean | 14 min |
| Aug 18, 3:15 AM EDT | Special Marine Warning | PHI | 30 min | |
| Aug 18, 3:34 PM EDT | Special Weather Statement | PHI | Sussex | 41 min |
| Aug 18, 3:40 PM EDT | Small Craft Advisory | PHI | 45 hr | |
| Aug 18, 4:14 PM EDT | Special Weather Statement | PHI | Sussex | 46 min |
| Aug 18, 5:16 PM EDT | Special Weather Statement | PHI | Burlington, Camden | 44 min |
| Aug 18, 5:44 PM EDT | Areal Flood Advisory | PHI | Burlington, Camden | 98 min |
| Aug 18, 5:55 PM EDT | Special Weather Statement | PHI | Burlington | 35 min |
| Aug 18, 6:17 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 43 min |
| Aug 18, 6:31 PM EDT | Special Marine Warning | PHI | 119 min | |
| Aug 18, 6:44 PM EDT | Severe Thunderstorm Warning | PHI | Ocean | 29 min |
Nearby
Flash Flood Watches in New Jersey, 2018Flash Flood Watches in Pennsylvania, 2018Flash Flood Watches in Delaware, 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.