Alert archive / New Jersey / Flash Flood Watches in 2020
Flash Flood Watch 1, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood watch at Jun 5, 2020, 9:47 AM EDT for 4 states. It took effect at Jun 5, 2020, 2:00 PM EDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Jun 5, 2020, 9:47 AM EDT (13:47 UTC)
- In effect from
- Jun 5, 2020, 2:00 PM EDT
- Expired
- Jun 5, 2020, 9:20 PM EDT
- In force
- 7 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Flood severity
- None
All 24 counties
New Castle County, DE, Cecil County, MD, Kent 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, Ocean County, NJ, Salem County, NJ, Somerset County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Chester County, PA, Delaware County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 63 km from the middle of the area, began a volume at 13:50 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, 1.8 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
- 34 J/kg
- Mixed-layer CIN
- -275 J/kg
- Mixed-layer LCL
- 685 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 139 m²/s²
- 0-3 km storm-relative helicity
- 150 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
152 WGUS61 KPHI 051347 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Mount Holly NJ 947 AM EDT Fri Jun 5 2020 DEZ001-MDZ008-012-NJZ007-009-010-012>022-025>027-PAZ060>062-070- 071-101>106-052215- /O.NEW.KPHI.FF.A.0001.200605T1800Z-200606T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Cecil-Kent MD-Warren-Hunterdon-Somerset-Middlesex- Western Monmouth-Eastern Monmouth-Mercer-Salem-Gloucester-Camden- Northwestern Burlington-Ocean-Cumberland-Atlantic- 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 Wilmington, Elkton, Chestertown, Washington, Flemington, Somerville, New Brunswick, Freehold, Sandy Hook, Trenton, Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Jackson, Millville, Hammonton, Atlantic City, Long Beach Island, Wharton State Forest, Reading, Allentown, Bethlehem, Easton, Media, Philadelphia, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 947 AM EDT Fri Jun 5 2020 ...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 and Kent. In New Jersey, Atlantic, Burlington, Camden, Cumberland, Gloucester, Hunterdon, Mercer, Middlesex, Monmouth, Ocean, Salem, Somerset, and Warren. In Pennsylvania, Berks, Bucks, Chester, Delaware, Lehigh, Montgomery, Northampton, and Philadelphia. * From 2 PM EDT this afternoon through this evening * Thunderstorms are expected to develop this afternoon in southeastern Pennsylvania into northern and central New Jersey. The strongest storms will be capable of producing locally heavy rainfall amounts of 1.5 to 2.5 inches in as little as an hour. Additionally, storm motions today will be slow, and storms may train over the same areas. As a result, instances of flash flooding are possible in the watch area. * In the areas of heaviest rainfall, flash flooding of small creeks and streams, poor-drainage areas, and urban areas may occur between mid afternoon and late this evening. 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
2 follow-up statements
730 WGUS61 KPHI 052158 FFAPHI Flood Watch National Weather Service Mount Holly NJ 558 PM EDT Fri Jun 5 2020 DEZ001-MDZ008-012-NJZ007-009-010-012>022-025>027-PAZ060>062-070- 071-101>106-060400- /O.CON.KPHI.FF.A.0001.000000T0000Z-200606T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Cecil-Kent MD-Warren-Hunterdon-Somerset-Middlesex- Western Monmouth-Eastern Monmouth-Mercer-Salem-Gloucester-Camden- Northwestern Burlington-Ocean-Cumberland-Atlantic- 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 Wilmington, Elkton, Chestertown, Washington, Flemington, Somerville, New Brunswick, Freehold, Sandy Hook, Trenton, Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Jackson, Millville, Hammonton, Atlantic City, Long Beach Island, Wharton State Forest, Reading, Allentown, Bethlehem, Easton, Media, Philadelphia, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 558 PM EDT Fri Jun 5 2020 ...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 southeast Pennsylvania. * Until midnight EDT tonight * Thunderstorms continue across the watch area this evening. The strongest storms will be capable of producing locally heavy rainfall amounts of 1.5 to 2.5 inches in as little as an hour. Additionally, storm motions today will be slow, and storms may train over the same areas. As a result, instances of flash flooding are possible in the watch area. * In the areas of heaviest rainfall, flash flooding of small creeks and streams, poor-drainage areas, and urban areas may occur through late evening. 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. && $$ Meola
554 WGUS61 KPHI 060120 FFAPHI Flood Watch National Weather Service Mount Holly NJ 920 PM EDT Fri Jun 5 2020 DEZ001-MDZ008-012-NJZ007-009-010-012>022-025>027-PAZ060>062-070- 071-101>106-060230- /O.CAN.KPHI.FF.A.0001.000000T0000Z-200606T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Cecil-Kent MD-Warren-Hunterdon-Somerset-Middlesex- Western Monmouth-Eastern Monmouth-Mercer-Salem-Gloucester-Camden- Northwestern Burlington-Ocean-Cumberland-Atlantic- 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 Wilmington, Elkton, Chestertown, Washington, Flemington, Somerville, New Brunswick, Freehold, Sandy Hook, Trenton, Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Jackson, Millville, Hammonton, Atlantic City, Long Beach Island, Wharton State Forest, Reading, Allentown, Bethlehem, Easton, Media, Philadelphia, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 920 PM EDT Fri Jun 5 2020 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of northern Delaware, northeast Maryland, New Jersey, and Pennsylvania has been cancelled. The threat of flash flooding due to heavy rain from thunderstorms has ended. Areas of light to moderate rain may continue to move through the region overnight. $$ Meola
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 4, 9:15 PM EDT | Special Weather Statement | PHI | Cecil, Kent, Queen Anne's, Talbot | 45 min |
| Jun 4, 9:30 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent, Queen Anne's | 28 min |
| Jun 4, 9:54 PM EDT | Special Weather Statement | PHI | Caroline, Cecil, Talbot | 36 min |
| Jun 4, 10:12 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent | 33 min |
| Jun 4, 10:07 PM EDT | Special Marine Warning | PHI | 53 min | |
| Jun 4, 10:31 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Gloucester | 46 min |
| Jun 4, 10:32 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Camden, Cumberland, Gloucester, Salem | 42 min |
| Jun 4, 10:52 PM EDT | Special Marine Warning | PHI | 38 min | |
| Jun 4, 10:59 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 1 more | 34 min |
| Jun 5, 12:06 AM EDT | Special Marine Warning | PHI | 54 min | |
| Jun 5, 3:24 PM EDT | Special Weather Statement | PHI | Mercer, Middlesex, Monmouth | 36 min |
| Jun 5, 3:57 PM EDT | Special Weather Statement | PHI | Mercer, Middlesex, Monmouth | 33 min |
| Jun 5, 4:36 PM EDT | Special Weather Statement | PHI | Monmouth | 24 min |
| Jun 5, 4:55 PM EDT | Special Weather Statement | PHI | Monmouth, Ocean | 50 min |
| Jun 5, 5:01 PM EDT | Areal Flood Advisory | PHI | Burlington, Mercer, Middlesex, Monmouth, Ocean, Somerset | 4 hr |
| Jun 5, 5:19 PM EDT | Areal Flood Advisory | PHI | Burlington, Camden, Gloucester, Ocean, Salem | 4 hr |
| Jun 5, 5:27 PM EDT | Flash Flood Warning | PHI | Monmouth, Ocean | 3 hr |
| Jun 4, 10:05 PM EDT | Special Weather Statement | PHI | Chester, Delaware, Montgomery, Philadelphia | 40 min |
| Jun 4, 10:46 PM EDT | Areal Flood Advisory | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 119 min |
| Jun 5, 3:15 PM EDT | Special Weather Statement | PHI | Bucks, Montgomery | 30 min |
| Jun 5, 3:48 PM EDT | Areal Flood Advisory | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 3 hr |
| Jun 5, 4:14 PM EDT | Special Weather Statement | PHI | Berks | 16 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.