Alert archive / New Jersey / Flash Flood Watches in 2018
Flash Flood Watch 15, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood watch at Sep 18, 2018, 9:27 AM EDT for 4 states. It took effect at Sep 18, 2018, 11:00 AM EDT. It was in force for 5 hr.
The area
The counties it named.
The facts
- Issued
- Sep 18, 2018, 9:27 AM EDT (13:27 UTC)
- In effect from
- Sep 18, 2018, 11:00 AM EDT
- Expired
- Sep 18, 2018, 3:53 PM EDT
- In force
- 5 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Flood severity
- None
All 23 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, Morris 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), 77 km from the middle of the area, began a volume at 13:28 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, 1.5 hours before the alert went out and 205 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
- 1035 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 495 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 220 m²/s²
- 0-3 km storm-relative helicity
- 238 m²/s²
- Significant tornado parameter
- 0.8
- Supercell composite
- 4.3
The text
As transmitted.
824 WGUS61 KPHI 181327 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Mount Holly NJ 927 AM EDT Tue Sep 18 2018 DEZ001-MDZ008-NJZ001-007>010-012-015>019-PAZ054-055-060>062-070- 071-101>106-182130- /O.NEW.KPHI.FF.A.0015.180918T1500Z-180918T2300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Cecil-Sussex-Warren-Morris-Hunterdon-Somerset- Middlesex-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, Elkton, Newton, Washington, Morristown, Flemington, Somerville, New Brunswick, 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 927 AM EDT Tue Sep 18 2018 ...FLASH FLOOD WATCH IN EFFECT UNTIL 7 PM EDT 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, Gloucester, Hunterdon, Mercer, Middlesex, Morris, Northwestern Burlington, Salem, Somerset, Sussex, and Warren. In Pennsylvania, Berks, Carbon, Delaware, Eastern Chester, Eastern Montgomery, Lehigh, Lower Bucks, Monroe, Northampton, Philadelphia, Upper Bucks, Western Chester, and Western Montgomery. * Until 7 PM EDT this evening * Showers and thunderstorms will develop along and ahead of a cold front as it moves south across the area this afternoon. Some of these storms will likely be heavy and could produce rainfall amounts in excess of 2 inches within 1 to 2 hours. This may result in flash flooding, especially for urban areas along the Interstate 95 corridor. 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. && $$ Fitzsimmons
3 follow-up statements
305 WGUS61 KPHI 181620 FFAPHI Flood Watch National Weather Service Mount Holly NJ 1220 PM EDT Tue Sep 18 2018 PAZ054-055-060-061-181730- /O.CAN.KPHI.FF.A.0015.000000T0000Z-180918T2300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Carbon-Monroe-Berks-Lehigh- Including the cities of Jim Thorpe, Stroudsburg, Reading, and Allentown 1220 PM EDT Tue Sep 18 2018 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of east central Pennsylvania and northeast Pennsylvania has been cancelled. The cold front has moved south of this area so heavy rain and flooding is no longer expected. $$ DEZ001-MDZ008-NJZ001-007>010-012-015>019-PAZ062-070-071-101>106- 182300- /O.CON.KPHI.FF.A.0015.000000T0000Z-180918T2300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Cecil-Sussex-Warren-Morris-Hunterdon-Somerset- Middlesex-Mercer-Salem-Gloucester-Camden-Northwestern Burlington- 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, Trenton, Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Bethlehem, Easton, Media, Philadelphia, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 1220 PM EDT Tue Sep 18 2018 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 7 PM EDT THIS EVENING... 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, Gloucester, Hunterdon, Mercer, Middlesex, Morris, Northwestern Burlington, Salem, Somerset, Sussex, and Warren. In Pennsylvania, Delaware, Eastern Chester, Eastern Montgomery, Lower Bucks, Northampton, Philadelphia, Upper Bucks, Western Chester, and Western Montgomery. * Until 7 PM EDT this evening * Showers and thunderstorms will continue along and ahead of a cold front as it moves south across the area this afternoon. Some of these storms will likely be heavy and could produce rainfall amounts in excess of 2 inches within 1 to 2 hours. This may result in flash flooding, especially for urban areas along the Interstate 95 corridor. 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. && $$
268 WGUS61 KPHI 181854 FFAPHI Flood Watch National Weather Service Mount Holly NJ 254 PM EDT Tue Sep 18 2018 NJZ001-007>009-PAZ062-101>103-105-182000- /O.CAN.KPHI.FF.A.0015.000000T0000Z-180918T2300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Sussex-Warren-Morris-Hunterdon-Northampton-Western Chester- Eastern Chester-Western Montgomery-Upper Bucks- Including the cities of Newton, Washington, Morristown, Flemington, Bethlehem, Easton, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, Pottstown, Chalfont, and Perkasie 254 PM EDT Tue Sep 18 2018 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of New Jersey and Pennsylvania has been cancelled. Heavy rain has ended with the passage of a cold front and flash flooding is no longer expected. $$ DEZ001-MDZ008-NJZ010-012-015>019-PAZ070-071-104-106-182300- /O.CON.KPHI.FF.A.0015.000000T0000Z-180918T2300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Cecil-Somerset-Middlesex-Mercer-Salem-Gloucester- Camden-Northwestern Burlington-Delaware-Philadelphia- Eastern Montgomery-Lower Bucks- Including the cities of Wilmington, Elkton, Somerville, New Brunswick, Trenton, Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Media, Philadelphia, Norristown, Lansdale, Morrisville, and Doylestown 254 PM EDT Tue Sep 18 2018 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 7 PM EDT THIS EVENING... The Flash Flood Watch continues for * Portions of northern Delaware, northeast Maryland, New Jersey, and southeast Pennsylvania, including the following areas, in northern Delaware, New Castle. In northeast Maryland, Cecil. In New Jersey, Camden, Gloucester, Mercer, Middlesex, Northwestern Burlington, Salem, and Somerset. In southeast Pennsylvania, Delaware, Eastern Montgomery, Lower Bucks, and Philadelphia. * Until 7 PM EDT this evening * Showers and thunderstorms continue to affect the area along a cold front moving through from north to south. Radar estimates indicate that some areas along the urban corridor have seen 1 to 2+ inches of rain within the past couple hours with waters rising on creeks and streams. Urban and small stream flooding along with localized areas of flash flooding will remain possible this afternoon with the front clearing the area by this evening bringing rain to an end. 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. && $$ Fitzsimmons
428 WGUS61 KPHI 181953 FFAPHI Flood Watch National Weather Service Mount Holly NJ 353 PM EDT Tue Sep 18 2018 DEZ001-MDZ008-NJZ010-012-015>019-PAZ070-071-104-106-182100- /O.CAN.KPHI.FF.A.0015.000000T0000Z-180918T2300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ New Castle-Cecil-Somerset-Middlesex-Mercer-Salem-Gloucester- Camden-Northwestern Burlington-Delaware-Philadelphia- Eastern Montgomery-Lower Bucks- Including the cities of Wilmington, Elkton, Somerville, New Brunswick, Trenton, Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Media, Philadelphia, Norristown, Lansdale, Morrisville, and Doylestown 353 PM EDT Tue Sep 18 2018 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of northern Delaware, northeast Maryland, New Jersey, and southeast Pennsylvania has been cancelled. The heaviest rain has cleared the area and flash flooding is no longer expected. $$ Fitzsimmons
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 18, 4:13 AM EDT | Special Weather Statement | PHI | Camden, Gloucester, Salem | 92 min |
| Sep 18, 10:59 AM EDT | Areal Flood Advisory | PHI | Hunterdon, Mercer, Middlesex, Monmouth, Somerset | 4 hr |
| Sep 18, 12:01 PM EDT | Flash Flood Warning | PHI | Mercer, Middlesex, Somerset | 4 hr |
| Sep 18, 12:16 PM EDT | Special Weather Statement | PHI | Middlesex | 29 min |
| Sep 18, 12:36 PM EDT | Areal Flood Advisory | PHI | Burlington, Camden, Gloucester, Mercer, Middlesex, Monmouth and 2 more | 3 hr |
| Sep 18, 1:20 PM EDT | Special Weather Statement | PHI | Burlington | 25 min |
| Sep 18, 1:35 PM EDT | Special Marine Warning | PHI | 55 min | |
| Sep 18, 2:51 PM EDT | Special Marine Warning | PHI | 38 min | |
| Sep 18, 2:55 PM EDT | Special Weather Statement | PHI | Ocean | 35 min |
| Sep 18, 3:02 PM EDT | Areal Flood Advisory | PHI | Burlington, Ocean | 3 hr |
| Sep 18, 3:12 PM EDT | Areal Flood Advisory | PHI | Atlantic, Burlington, Camden, Ocean | 47 min |
| Sep 18, 3:47 PM EDT | Special Weather Statement | PHI | Ocean | 28 min |
| Sep 18, 4:12 PM EDT | Special Weather Statement | PHI | Atlantic | 33 min |
| Sep 18, 4:47 PM EDT | Areal Flood Advisory | PHI | Atlantic, Cape May, Cumberland, Ocean | 2 hr |
| Sep 18, 5:17 PM EDT | Flash Flood Warning | PHI | Atlantic | 113 min |
| Sep 18, 1:13 AM EDT | Special Weather Statement | PHI | Chester | 62 min |
| Sep 18, 2:09 AM EDT | Special Weather Statement | PHI | Chester, Delaware, Montgomery, Philadelphia | 81 min |
| Sep 18, 2:38 AM EDT | Areal Flood Advisory | PHI | Chester, Montgomery | 4 hr |
| Sep 18, 6:27 AM EDT | Areal Flood Advisory | PHI | Carbon, Monroe | 4 hr |
| Sep 18, 10:57 AM EDT | Areal Flood Advisory | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 3 hr |
| Sep 18, 5:26 PM EDT | Special Weather Statement | PHI | Sussex | 34 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.