Alert archive / New Jersey / Flash Flood Watches in 2018
Flash Flood Watch 1, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood watch at Apr 15, 2018, 3:41 PM EDT for 10 counties in New Jersey; 10 counties in Pennsylvania. It took effect at Apr 16, 2018, 2:00 AM EDT. It was in force for 10 hr.
The area
The counties it named.
The facts
- Issued
- Apr 15, 2018, 3:41 PM EDT (19:41 UTC)
- In effect from
- Apr 16, 2018, 2:00 AM EDT
- Expired
- Apr 16, 2018, 12:02 PM EDT
- In force
- 10 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, Morris 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), 79 km from the middle of the area, began a volume at 19:47 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, 7.7 hours before the alert went out and 196 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 682 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 201 m²/s²
- 0-3 km storm-relative helicity
- 447 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
587 WGUS61 KPHI 151941 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Mount Holly NJ 341 PM EDT Sun Apr 15 2018 NJZ001-007>010-012-015-017>019-PAZ054-055-061-062-070-071-103>106- 160900- /O.NEW.KPHI.FF.A.0001.180416T0600Z-180416T2200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-Mercer- Gloucester-Camden-Northwestern Burlington-Carbon-Monroe-Lehigh- Northampton-Delaware-Philadelphia-Western Montgomery- Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Newton, Washington, Morristown, Flemington, Somerville, New Brunswick, Trenton, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Jim Thorpe, Stroudsburg, Allentown, Bethlehem, Easton, Media, Philadelphia, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 341 PM EDT Sun Apr 15 2018 ...FLASH FLOOD WATCH IN EFFECT FROM 2 AM EDT MONDAY THROUGH MONDAY AFTERNOON... The National Weather Service in Mount Holly has issued a * Flash Flood Watch for portions of New Jersey and Pennsylvania, including the following areas, in New Jersey, Camden, Gloucester, Hunterdon, Mercer, Middlesex, Morris, Northwestern Burlington, Somerset, Sussex, and Warren. In Pennsylvania, Carbon, Delaware, Eastern Montgomery, Lehigh, Lower Bucks, Monroe, Northampton, Philadelphia, Upper Bucks, and Western Montgomery. * From 2 AM EDT Monday through Monday afternoon * A line of strong thunderstorms is expected to move through the area late tonight and Monday morning. Widespread rainfall totals of one to three inches are forecast, with locally higher amounts possible with the strongest storms. The storms will likely move out of the area by Monday afternoon. * The areas of greatest risk are poor-drainage and urban locations where rapid runoff may cause localized flash flooding. Quickly responding small streams may also experience flooding in areas receiving the heaviest rainfall. The storms are expected to move through the area just before or during the morning commute. Motorists should be prepared for torrential downpours and potential flooding as the storms move through. 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
939 WGUS61 KPHI 160537 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Mount Holly NJ 137 AM EDT Mon Apr 16 2018 PAZ060-101-102-161700- /O.EXA.KPHI.FF.A.0001.180416T0600Z-180416T2200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Berks-Western Chester-Eastern Chester- Including the cities of Reading, Honey Brook, Oxford, West Chester, and Kennett Square 137 AM EDT Mon Apr 16 2018 ...FLASH FLOOD WATCH IN EFFECT THROUGH THIS AFTERNOON... The National Weather Service in Mount Holly has expanded the * Flash Flood Watch to include portions of east central Pennsylvania and southeast Pennsylvania, including the following areas, in east central Pennsylvania, Berks. In southeast Pennsylvania, Eastern Chester and Western Chester. * Through this afternoon * A line of strong thunderstorms is expected to move through the area early this morning. Widespread rainfall totals of one to three inches are forecast, with locally higher amounts possible with the strongest storms. The storms will likely move out of the area by this afternoon. * The areas of greatest risk are poor-drainage and urban locations where rapid runoff may cause localized flash flooding. Quickly responding small streams may also experience flooding in areas receiving the heaviest rainfall. The storms are expected to move through the area just before or during the morning commute. Motorists should be prepared for torrential downpours and potential flooding as the storms move through. 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. && $$ NJZ001-007>010-012-015-017>019-PAZ054-055-061-062-070-071-103>106- 161700- /O.CON.KPHI.FF.A.0001.180416T0600Z-180416T2200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-Mercer- Gloucester-Camden-Northwestern Burlington-Carbon-Monroe-Lehigh- Northampton-Delaware-Philadelphia-Western Montgomery- Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Newton, Washington, Morristown, Flemington, Somerville, New Brunswick, Trenton, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Jim Thorpe, Stroudsburg, Allentown, Bethlehem, Easton, Media, Philadelphia, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 137 AM EDT Mon Apr 16 2018 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THIS AFTERNOON... The Flash Flood Watch continues for * Portions of New Jersey and Pennsylvania, including the following areas, in New Jersey, Camden, Gloucester, Hunterdon, Mercer, Middlesex, Morris, Northwestern Burlington, Somerset, Sussex, and Warren. In Pennsylvania, Carbon, Delaware, Eastern Montgomery, Lehigh, Lower Bucks, Monroe, Northampton, Philadelphia, Upper Bucks, and Western Montgomery. * Through this afternoon * A line of strong thunderstorms is expected to move through the area early this morning. Widespread rainfall totals of one to three inches are forecast, with locally higher amounts possible with the strongest storms. The storms will likely move out of the area by Monday afternoon. * The areas of greatest risk are poor-drainage and urban locations where rapid runoff may cause localized flash flooding. Quickly responding small streams may also experience flooding in areas receiving the heaviest rainfall. The storms are expected to move through the area just before or during the morning commute. Motorists should be prepared for torrential downpours and potential flooding as the storms move through. 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. && $$
729 WGUS61 KPHI 161602 FFAPHI Flood Watch National Weather Service Mount Holly NJ 1202 PM EDT Mon Apr 16 2018 NJZ001-007>010-012-015-017>019-PAZ054-055-060>062-070-071-101>106- 161715- /O.CAN.KPHI.FF.A.0001.000000T0000Z-180416T2200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-Mercer- Gloucester-Camden-Northwestern Burlington-Carbon-Monroe-Berks- Lehigh-Northampton-Delaware-Philadelphia-Western Chester- Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks- Lower Bucks- Including the cities of Newton, Washington, Morristown, Flemington, Somerville, New Brunswick, Trenton, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Jim Thorpe, Stroudsburg, Reading, Allentown, Bethlehem, Easton, Media, Philadelphia, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 1202 PM EDT Mon Apr 16 2018 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of New Jersey and Pennsylvania has been cancelled. The steady moderate to heavy rainfall has exited the area, therefore the Flash Flood Watch has been cancelled. However, there will be some scattered showers or isolated thunderstorms through this afternoon. There will remain some residual flooding into this afternoon and evening. Several Flood Warnings and Flood Advisories remain in effect, so please see these statements for the latest updates. $$
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 15, 6:08 AM EDT | Coastal Flood Watch | PHI | Middlesex, Monmouth, Ocean | 9 hr |
| Apr 15, 6:08 AM EDT | Coastal Flood Advisory | PHI | Middlesex, Monmouth, Ocean | 4 hr |
| Apr 15, 6:08 AM EDT | Coastal Flood Advisory | PHI | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more | 39 hr |
| Apr 15, 2:44 PM EDT | Coastal Flood Warning | PHI | Atlantic, Burlington, Cape May, Cumberland, Middlesex, Monmouth and 2 more | 23 hr |
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.