Alert archive / New Jersey / Flash Flood Watches in 2020
Flash Flood Watch 8, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood watch at Aug 13, 2020, 3:02 AM EDT for 4 states. It took effect at Aug 13, 2020, 8:00 AM EDT. It was in force for 12 hr.
The area
The counties it named.
The facts
- Issued
- Aug 13, 2020, 3:02 AM EDT (07:02 UTC)
- In effect from
- Aug 13, 2020, 8:00 AM EDT
- Expired
- Aug 13, 2020, 8:19 PM EDT
- In force
- 12 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Flood severity
- None
All 26 counties
Kent County, DE, New Castle County, DE, Sussex County, DE, Caroline County, MD, Cecil County, MD, Kent County, MD, Queen Anne's County, MD, Talbot County, MD, 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, Ocean County, NJ, Salem County, NJ, Somerset County, NJ, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 73 km from the middle of the area, began a volume at 07:03 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
Wallops Is Stn, VA (KWAL), launched 00:00Z, 7.0 hours before the alert went out and 197 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
- 748 J/kg
- Mixed-layer CIN
- -42 J/kg
- Mixed-layer LCL
- 961 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 5 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
136 WGUS61 KPHI 130702 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Mount Holly NJ 302 AM EDT Thu Aug 13 2020 DEZ001>004-MDZ008-012-015-019-020-NJZ016>027-PAZ070-071-101-102- 104-106-132100- /O.NEW.KPHI.FF.A.0008.200813T1200Z-200814T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Kent-Inland Sussex-Delaware Beaches-Cecil-Kent MD- Queen Annes-Talbot-Caroline-Salem-Gloucester-Camden- Northwestern Burlington-Ocean-Cumberland-Atlantic-Cape May- Atlantic Coastal Cape May-Coastal Atlantic-Coastal Ocean- Southeastern Burlington-Delaware-Philadelphia-Western Chester- Eastern Chester-Eastern Montgomery-Lower Bucks- Including the cities of Wilmington, Dover, Georgetown, Rehoboth Beach, Elkton, Chestertown, Centreville, Easton, Denton, 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, Media, Philadelphia, Honey Brook, Oxford, West Chester, Kennett Square, Norristown, Lansdale, Morrisville, and Doylestown 302 AM EDT Thu Aug 13 2020 ...FLASH FLOOD WATCH IN EFFECT FROM 8 AM EDT THIS MORNING THROUGH THIS EVENING... The National Weather Service in Mount Holly has issued a * Flash Flood Watch for portions of Delaware, northeastern Maryland, southern New Jersey and southeastern Pennsylvania. * From 8:00 AM this morning until midnight tonight. * Slow moving showers and thunderstorms are expected to develop in the region today. Locally heavy downpours are anticipated. Rainfall amounts as high as 2 to 4 inches are possible in a short amount of time. * The ground remains saturated and streams and creeks are running high. As a result, much of the area is more susceptible to flooding than usual. The heavy rain will result in flooding of roadways and areas of poor drainage, as well as small streams and creeks. 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. && $$ Iovino
3 follow-up statements
047 WGUS61 KPHI 131154 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Mount Holly NJ 754 AM EDT Thu Aug 13 2020 NJZ009-010-012>015-PAZ103-105-140000- /O.EXA.KPHI.FF.A.0008.200813T1200Z-200814T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Hunterdon-Somerset-Middlesex-Western Monmouth-Eastern Monmouth- Mercer-Western Montgomery-Upper Bucks- Including the cities of Flemington, Somerville, New Brunswick, Freehold, Sandy Hook, Trenton, Collegeville, Pottstown, Chalfont, and Perkasie 754 AM EDT Thu Aug 13 2020 ...FLASH FLOOD WATCH IN EFFECT THROUGH THIS EVENING... The National Weather Service in Mount Holly has expanded the * Flash Flood Watch to include portions of New Jersey and southeast Pennsylvania, including the following areas, in New Jersey, Eastern Monmouth, Hunterdon, Mercer, Middlesex, Somerset, and Western Monmouth. In southeast Pennsylvania, Upper Bucks and Western Montgomery. * Through this evening * Slow moving showers and thunderstorms are expected in the region today. Locally heavy downpours are anticipated. Rainfall amounts as high as 2 to 4 inches are possible in a short amount of time. * The ground remains saturated and streams and creeks are running high. As a result, much of the area is more susceptible to flooding than usual. The heavy rain will result in flooding of roadways and areas of poor drainage, as well as small streams and creeks. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that there is the potential for flash flooding which can be life-threatening. Heavy rain is expected to occur over a short period of time. Rapidly rising flood waters may quickly inundate roadways and areas of poor drainage. Streams and creeks could leave their banks, flooding nearby properties. Please monitor the forecast, especially if you live in a location that is prone to flooding. Be prepared to take action if a Flash Flood Warning is issued for your area. && $$ DEZ001>004-MDZ008-012-015-019-020-NJZ016>027-PAZ070-071-101-102- 104-106-140000- /O.CON.KPHI.FF.A.0008.200813T1200Z-200814T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Kent-Inland Sussex-Delaware Beaches-Cecil-Kent MD- Queen Annes-Talbot-Caroline-Salem-Gloucester-Camden- Northwestern Burlington-Ocean-Cumberland-Atlantic-Cape May- Atlantic Coastal Cape May-Coastal Atlantic-Coastal Ocean- Southeastern Burlington-Delaware-Philadelphia-Western Chester- Eastern Chester-Eastern Montgomery-Lower Bucks- Including the cities of Wilmington, Dover, Georgetown, Rehoboth Beach, Elkton, Chestertown, Centreville, Easton, Denton, 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, Media, Philadelphia, Honey Brook, Oxford, West Chester, Kennett Square, Norristown, Lansdale, Morrisville, and Doylestown 754 AM EDT Thu Aug 13 2020 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THIS EVENING... The Flash Flood Watch continues for * Portions of Delaware, northeast Maryland, southern New Jersey, and southeast Pennsylvania. * Through this evening * Slow moving showers and thunderstorms are expected to develop in the region today. Locally heavy downpours are anticipated. Rainfall amounts as high as 2 to 4 inches are possible in a short amount of time. * The ground remains saturated and streams and creeks are running high. As a result, much of the area is more susceptible to flooding than usual. The heavy rain will result in flooding of roadways and areas of poor drainage, as well as small streams and creeks. 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. && $$ CMS
536 WGUS61 KPHI 132124 FFAPHI Flood Watch National Weather Service Mount Holly NJ 524 PM EDT Thu Aug 13 2020 DEZ001>004-MDZ008-012-015-019-020-NJZ009-010-012>027-PAZ070-071- 101>106-140400- /O.CON.KPHI.FF.A.0008.000000T0000Z-200814T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Kent-Inland Sussex-Delaware Beaches-Cecil-Kent MD- Queen Annes-Talbot-Caroline-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-Delaware-Philadelphia-Western Chester- Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks- Lower Bucks- Including the cities of Wilmington, Dover, Georgetown, Rehoboth Beach, Elkton, Chestertown, Centreville, Easton, Denton, 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, Media, Philadelphia, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 524 PM EDT Thu Aug 13 2020 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL MIDNIGHT EDT TONIGHT... The Flash Flood Watch continues for * Portions of Delaware, northeast Maryland, New Jersey, and southeast Pennsylvania, including the following areas, in Delaware, Delaware Beaches, Inland Sussex, Kent, and New Castle. In northeast Maryland, Caroline, Cecil, Kent MD, Queen Annes, and Talbot. In New Jersey, Atlantic, Atlantic Coastal Cape May, Camden, Cape May, Coastal Atlantic, Coastal Ocean, Cumberland, Eastern Monmouth, Gloucester, Hunterdon, Mercer, Middlesex, Northwestern Burlington, Ocean, Salem, Somerset, Southeastern Burlington, and Western Monmouth. In southeast Pennsylvania, Delaware, Eastern Chester, Eastern Montgomery, Lower Bucks, Philadelphia, Upper Bucks, Western Chester, and Western Montgomery. * Until midnight EDT tonight * Slow moving showers and thunderstorms are expected to continue into the evening. Locally heavy downpours are anticipated. Rainfall amounts as high as 2 to 4 inches are possible in a short amount of time. * The ground remains saturated and streams and creeks are running high. As a result, much of the area is more susceptible to flooding than usual. The heavy rain will result in flooding of roadways and areas of poor drainage, as well as small streams and creeks. 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. && $$
596 WGUS61 KPHI 140019 FFAPHI Flood Watch National Weather Service Mount Holly NJ 819 PM EDT Thu Aug 13 2020 DEZ001>004-MDZ008-012-015-019-020-NJZ009-010-012>027-PAZ070-071- 101>106-140130- /O.CAN.KPHI.FF.A.0008.000000T0000Z-200814T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Kent-Inland Sussex-Delaware Beaches-Cecil-Kent MD- Queen Annes-Talbot-Caroline-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-Delaware-Philadelphia-Western Chester- Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks- Lower Bucks- Including the cities of Wilmington, Dover, Georgetown, Rehoboth Beach, Elkton, Chestertown, Centreville, Easton, Denton, 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, Media, Philadelphia, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 819 PM EDT Thu Aug 13 2020 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of Delaware, northeast Maryland, New Jersey, and southeast Pennsylvania has been cancelled. Showers and thunderstorms producing heavy rain and flash flooding have ended. Therefore, the Flash Flood Watch has been cancelled. $$ MPS
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 7:47 AM EDT | Areal Flood Advisory | PHI | Hunterdon, Mercer, Middlesex, Somerset | 118 min |
| Aug 13, 8:37 AM EDT | Flash Flood Warning | PHI | Hunterdon, Mercer, Middlesex, Somerset | 3 hr |
| Aug 13, 9:36 AM EDT | Areal Flood Advisory | PHI | Hunterdon, Middlesex, Morris, Somerset | 114 min |
| Aug 13, 10:01 AM EDT | Flash Flood Warning | PHI | Middlesex, Morris, Somerset | 3 hr |
| Aug 13, 1:06 PM EDT | Special Weather Statement | PHI | Ocean | 39 min |
| Aug 13, 1:30 PM EDT | Special Weather Statement | PHI | Cumberland | 45 min |
| Aug 13, 1:56 PM EDT | Areal Flood Advisory | PHI | Atlantic, Cape May, Cumberland | 2 hr |
| Aug 13, 1:58 PM EDT | Areal Flood Advisory | PHI | Atlantic, Burlington, Ocean | 2 hr |
| Aug 13, 2:44 PM EDT | Areal Flood Advisory | PHI | Atlantic | 2 hr |
| Aug 13, 3:54 PM EDT | Special Weather Statement | PHI | Cape May | 36 min |
| Aug 13, 4:01 PM EDT | Areal Flood Advisory | PHI | Cape May | 2 hr |
| Aug 13, 4:52 PM EDT | Flash Flood Warning | PHI | Cape May | 113 min |
| Aug 13, 7:25 AM EDT | Areal Flood Advisory | PHI | Bucks, Montgomery | 2 hr |
| Aug 13, 9:07 AM EDT | Flash Flood Warning | PHI | Bucks, Montgomery | 3 hr |
| Aug 13, 3:30 PM EDT | Areal Flood Advisory | PHI | Philadelphia | 3 hr |
| Aug 13, 3:56 PM EDT | Areal Flood Advisory | PHI | Delaware | 2 hr |
| Aug 13, 4:45 PM EDT | Areal Flood Advisory | PHI | Chester, Montgomery | 84 min |
| Aug 13, 10:14 AM EDT | Flash Flood Warning | PHI | Kent, Queen Anne's | 4 hr |
| Aug 13, 11:28 AM EDT | Areal Flood Advisory | PHI | Caroline, Kent, Queen Anne's, Talbot | 4 hr |
| Aug 13, 11:46 AM EDT | Areal Flood Advisory | PHI | Cecil, Kent | 3 hr |
| Aug 13, 12:02 PM EDT | Flash Flood Warning | PHI | Kent, Queen Anne's | 2 hr |
| Aug 13, 11:56 AM EDT | Areal Flood Advisory | PHI | Kent, Sussex | 3 hr |
| Aug 13, 12:22 PM EDT | Special Weather Statement | PHI | Sussex | 38 min |
Nearby
Flash Flood Watches in New Jersey, 2020Flash Flood Watches in Pennsylvania, 2020Flash Flood Watches in Maryland, 2020Every flash flood watch in 2020
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.