Alert archive / New Jersey / Flash Flood Watches in 2018
Flash Flood Watch 7, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood watch at Jul 17, 2018, 3:36 AM EDT for 9 counties in New Jersey; 4 counties in Pennsylvania. It took effect at Jul 17, 2018, 11:00 AM EDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Jul 17, 2018, 3:36 AM EDT (07:36 UTC)
- In effect from
- Jul 17, 2018, 11:00 AM EDT
- Expired
- Jul 17, 2018, 6:28 PM EDT
- In force
- 7 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Flood severity
- None
Counties Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Somerset County, NJ, Bucks County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 49 km from the middle of the area, began a volume at 07:39 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, 7.6 hours before the alert went out and 183 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
- 411 J/kg
- Mixed-layer CIN
- -120 J/kg
- Mixed-layer LCL
- 1044 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- -46 m²/s²
- 0-3 km storm-relative helicity
- -5 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
685 WGUS61 KPHI 170736 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Mount Holly NJ 336 AM EDT Tue Jul 17 2018 NJZ008>010-012-013-015-017>019-PAZ070-071-104-106-172000- /O.NEW.KPHI.FF.A.0007.180717T1500Z-180718T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Morris-Hunterdon-Somerset-Middlesex-Western Monmouth-Mercer- Gloucester-Camden-Northwestern Burlington-Delaware-Philadelphia- Eastern Montgomery-Lower Bucks- Including the cities of Morristown, Flemington, Somerville, New Brunswick, Freehold, Trenton, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Media, Philadelphia, Norristown, Lansdale, Morrisville, and Doylestown 336 AM EDT Tue Jul 17 2018 ...FLASH FLOOD WATCH IN EFFECT FROM 11 AM EDT THIS MORNING THROUGH THIS EVENING... The National Weather Service in Mount Holly has issued a * Flash Flood Watch for portions of New Jersey and southeast Pennsylvania, including the following areas, in New Jersey, Camden, Gloucester, Hunterdon, Mercer, Middlesex, Morris, Northwestern Burlington, Somerset, and Western Monmouth. In southeast Pennsylvania, Delaware, Eastern Montgomery, Lower Bucks, and Philadelphia. * From 11 AM EDT this morning through this evening * Thunderstorms producing heavy rain could result in flash flooding across along and near the Interstate 95 corridor in New Jersey and southeastern Pennsylvania. One to two inches of rain is expected, though locally higher amounts above 3 inches are possible. * The heaviest rain is expected this afternoon and evening, including the afternoon commute. Excessive 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. 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. && $$ SFJ
2 follow-up statements
582 WGUS61 KPHI 171940 FFAPHI Flood Watch National Weather Service Mount Holly NJ 340 PM EDT Tue Jul 17 2018 NJZ008>010-012-013-015-017>019-PAZ070-071-104-106-180400- /O.CON.KPHI.FF.A.0007.000000T0000Z-180718T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Morris-Hunterdon-Somerset-Middlesex-Western Monmouth-Mercer- Gloucester-Camden-Northwestern Burlington-Delaware-Philadelphia- Eastern Montgomery-Lower Bucks- Including the cities of Morristown, Flemington, Somerville, New Brunswick, Freehold, Trenton, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Media, Philadelphia, Norristown, Lansdale, Morrisville, and Doylestown 340 PM EDT Tue Jul 17 2018 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL MIDNIGHT EDT TONIGHT... The Flash Flood Watch continues for * Portions of New Jersey and southeast Pennsylvania, including the following areas, in New Jersey, Camden, Gloucester, Hunterdon, Mercer, Middlesex, Morris, Northwestern Burlington, Somerset, and Western Monmouth. In southeast Pennsylvania, Delaware, Eastern Montgomery, Lower Bucks, and Philadelphia. * Until midnight EDT tonight * Thunderstorms producing heavy rain could result in flash flooding across along and near the Interstate 95 corridor in New Jersey and southeastern Pennsylvania. One to two inches of rain is expected, though locally higher amounts above 3 inches are possible. * The heaviest rain is expected through the evening, including the afternoon commute. Excessive 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. 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. && $$
273 WGUS61 KPHI 172228 FFAPHI Flood Watch National Weather Service Mount Holly NJ 628 PM EDT Tue Jul 17 2018 NJZ008>010-012-013-015-017>019-PAZ070-071-104-106-172330- /O.CAN.KPHI.FF.A.0007.000000T0000Z-180718T0400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Morris-Hunterdon-Somerset-Middlesex-Western Monmouth-Mercer- Gloucester-Camden-Northwestern Burlington-Delaware-Philadelphia- Eastern Montgomery-Lower Bucks- Including the cities of Morristown, Flemington, Somerville, New Brunswick, Freehold, Trenton, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Media, Philadelphia, Norristown, Lansdale, Morrisville, and Doylestown 628 PM EDT Tue Jul 17 2018 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of New Jersey and southeast Pennsylvania has been cancelled. While a few additional showers and thunderstorms are possible through the evening hours, widespread flash flooding is no longer expected. $$
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 12:35 PM EDT | Special Weather Statement | PHI | Sussex | 25 min |
| Jul 17, 1:31 PM EDT | Special Weather Statement | PHI | Hunterdon | 44 min |
| Jul 17, 1:45 PM EDT | Special Weather Statement | PHI | Morris | 30 min |
| Jul 17, 2:05 PM EDT | Areal Flood Advisory | PHI | Hunterdon, Morris, Somerset, Sussex, Warren | 3 hr |
| Jul 17, 2:09 PM EDT | Special Weather Statement | PHI | Morris | 36 min |
| Jul 17, 2:44 PM EDT | Special Weather Statement | PHI | Middlesex | 31 min |
| Jul 17, 2:48 PM EDT | Special Weather Statement | PHI | Mercer | 27 min |
| Jul 17, 2:50 PM EDT | Areal Flood Advisory | PHI | Hunterdon, Mercer, Middlesex, Morris, Somerset | 3 hr |
| Jul 17, 2:58 PM EDT | Severe Thunderstorm Warning | PHI | Mercer | 32 min |
| Jul 17, 3:09 PM EDT | Special Weather Statement | PHI | Monmouth | 36 min |
| Jul 17, 3:48 PM EDT | Special Weather Statement | PHI | Ocean | 57 min |
| Jul 17, 3:51 PM EDT | Special Weather Statement | PHI | Monmouth | 24 min |
| Jul 17, 3:54 PM EDT | Special Marine Warning | PHI | 66 min | |
| Jul 17, 3:58 PM EDT | Special Weather Statement | PHI | Ocean | 32 min |
| Jul 17, 4:00 PM EDT | Special Weather Statement | PHI | Cumberland | 45 min |
| Jul 17, 4:03 PM EDT | Areal Flood Advisory | PHI | Burlington, Mercer, Middlesex, Monmouth, Ocean | 2 hr |
| Jul 17, 4:21 PM EDT | Special Marine Warning | PHI | 24 min | |
| Jul 17, 4:35 PM EDT | Flash Flood Warning | PHI | Ocean | 4 hr |
| Jul 17, 4:38 PM EDT | Special Marine Warning | PHI | 52 min | |
| Jul 17, 4:48 PM EDT | Special Weather Statement | PHI | Cumberland, Ocean | 57 min |
| Jul 17, 1:49 PM EDT | Special Weather Statement | PHI | Chester, Montgomery | 41 min |
| Jul 17, 2:21 PM EDT | Special Weather Statement | PHI | Chester | 39 min |
| Jul 17, 2:27 PM EDT | Flash Flood Warning | PHI | Berks, Chester, Montgomery | 4 hr |
| Jul 17, 3:35 PM EDT | Special Weather Statement | PHI | Delaware, Montgomery | 25 min |
Nearby
Flash Flood Watches in New Jersey, 2018Flash Flood Watches in Pennsylvania, 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.