Alert archive / New Jersey / Flash Flood Watches in 2015
Flash Flood Watch 5, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood watch at Aug 20, 2015, 2:46 PM EDT for 4 states. It was in force for 13 hr.
The area
The counties it named.
The facts
- Issued
- Aug 20, 2015, 2:46 PM EDT (18:46 UTC)
- Expired
- Aug 21, 2015, 3:39 AM EDT
- In force
- 13 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Flood severity
- None
All 24 counties
New Castle County, DE, Cecil County, MD, Kent 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 18:49 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, 6.8 hours before the alert went out and 210 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
- 227 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 637 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- -12 m²/s²
- 0-3 km storm-relative helicity
- 17 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
950 WGUS61 KPHI 201846 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 246 PM EDT THU AUG 20 2015 NJZ001-007-PAZ054-055-060>062-210300- /O.NEW.KPHI.FF.A.0005.150820T1846Z-150821T0800Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SUSSEX-WARREN-CARBON-MONROE-BERKS-LEHIGH-NORTHAMPTON- INCLUDING THE CITIES OF...NEWTON...WASHINGTON...JIM THORPE... STROUDSBURG...READING...ALLENTOWN...BETHLEHEM...EASTON 246 PM EDT THU AUG 20 2015 ...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT... THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A * FLASH FLOOD WATCH FOR PORTIONS OF NORTHERN NEW JERSEY AND PENNSYLVANIA...INCLUDING THE FOLLOWING IN NORTHERN ...NEW JERSEY...SUSSEX AND WARREN. IN PENNSYLVANIA...BERKS...CARBON... LEHIGH...MONROE AND NORTHAMPTON. * THROUGH LATE TONIGHT * WIDESPREAD SHOWERS AND EMBEDDED THUNDERSTORMS ARE MOVING IN FROM THE SOUTHWEST THIS AFTERNOON. SOME OF THE HEAVIER SHOWERS AND THUNDERSTORMS WILL BE CAPABLE OF PRODUCING RAINFALL RATES IN EXCESS OF 2 INCHES PER HOUR. WITH MULTIPLE ROUNDS OF HEAVY RAIN POSSIBLE THIS AFTERNOON AND TONIGHT, LOCALLY HIGHER RAINFALL AMOUNTS OF 3 TO 4 INCHES ARE POSSIBLE IN SPOTS. * POOR DRAINAGE ROADWAY FLOODING WILL BE LIKELY WHERE THE HEAVIEST RAINS FALL. THERE IS ALSO THE POTENTIAL FOR FLASH FLOODING ALONG SMALLER STREAMS, CREEKS, AND URBANIZED AREAS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO A RAPID RISE OF WATER TO DANGEROUS LEVELS. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ DEZ001-MDZ008-012-NJZ008>010-012-015>019-PAZ070-071-101>106- 210300- /O.NEW.KPHI.FF.A.0005.150820T1846Z-150821T1300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NEW CASTLE-CECIL-KENT MD-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX- MERCER-SALEM-GLOUCESTER-CAMDEN-NORTHWESTERN BURLINGTON-DELAWARE- PHILADELPHIA-WESTERN CHESTER-EASTERN CHESTER-WESTERN MONTGOMERY- EASTERN MONTGOMERY-UPPER BUCKS-LOWER BUCKS- INCLUDING THE CITIES OF...WILMINGTON...ELKTON...CHESTERTOWN... MORRISTOWN...FLEMINGTON...SOMERVILLE...NEW BRUNSWICK...TRENTON... PENNSVILLE...GLASSBORO...CAMDEN...CHERRY HILL...MOORESTOWN... MOUNT HOLLY...MEDIA...PHILADELPHIA...HONEY BROOK...OXFORD... WEST CHESTER...KENNETT SQUARE...COLLEGEVILLE...POTTSTOWN... NORRISTOWN...LANSDALE...CHALFONT...PERKASIE...MORRISVILLE... DOYLESTOWN 246 PM EDT THU AUG 20 2015 ...FLASH FLOOD WATCH IN EFFECT THROUGH FRIDAY MORNING... THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A * FLASH FLOOD WATCH FOR PORTIONS OF NORTHERN DELAWARE... NORTHEAST MARYLAND...NEW JERSEY AND SOUTHEAST PENNSYLVANIA... INCLUDING THE FOLLOWING IN NORTHERN ...DELAWARE...NEW CASTLE. IN NORTHEAST MARYLAND...CECIL AND KENT MD. IN NEW JERSEY... CAMDEN...GLOUCESTER...HUNTERDON...MERCER...MIDDLESEX... MORRIS...NORTHWESTERN BURLINGTON...SALEM AND SOMERSET. IN SOUTHEAST PENNSYLVANIA...DELAWARE...EASTERN CHESTER...EASTERN MONTGOMERY...LOWER BUCKS...PHILADELPHIA...UPPER BUCKS... WESTERN CHESTER AND WESTERN MONTGOMERY. * THROUGH FRIDAY MORNING * NUMEROUS SHOWERS AND EMBEDDED THUNDERSTORMS WILL MOVE IN FROM THE SOUTHWEST DURING THE MID AND LATE AFTERNOON. SOME OF THE HEAVIER SHOWERS AND THUNDERSTORMS WILL BE CAPABLE OF PRODUCING RAINFALL RATES IN EXCESS OF 2 INCHES PER HOUR. * POOR DRAINAGE ROADWAY FLOODING WILL BE LIKELY WHERE THE HEAVIEST RAINS FALL. THERE IS ALSO THE POTENTIAL FOR FLASH FLOODING ALONG SMALLER STREAMS, CREEKS, AND URBANIZED AREAS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO A RAPID RISE OF WATER TO DANGEROUS LEVELS. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$
2 follow-up statements
160 WGUS61 KPHI 210152 FFAPHI FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 952 PM EDT THU AUG 20 2015 NJZ001-007-PAZ054-055-060>062-210800- /O.CON.KPHI.FF.A.0005.000000T0000Z-150821T0800Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SUSSEX-WARREN-CARBON-MONROE-BERKS-LEHIGH-NORTHAMPTON- INCLUDING THE CITIES OF...NEWTON...WASHINGTON...JIM THORPE... STROUDSBURG...READING...ALLENTOWN...BETHLEHEM...EASTON 952 PM EDT THU AUG 20 2015 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 4 AM EDT FRIDAY... THE FLASH FLOOD WATCH CONTINUES FOR * PORTIONS OF NORTHERN NEW JERSEY AND PENNSYLVANIA...INCLUDING THE FOLLOWING IN NORTHERN ...NEW JERSEY...SUSSEX AND WARREN. IN PENNSYLVANIA...BERKS...CARBON...LEHIGH...MONROE AND NORTHAMPTON. * UNTIL 4 AM EDT FRIDAY * WIDESPREAD SHOWERS AND EMBEDDED THUNDERSTORMS ARE MOVING THROUGH THE AREA THIS EVENING. SOME OF THE HEAVIER SHOWERS AND THUNDERSTORMS WILL BE CAPABLE OF PRODUCING RAINFALL RATES UP TO 2 INCHES PER HOUR. LOCALLY HIGHER RAINFALL AMOUNTS OF 3 TO 5 INCHES ARE POSSIBLE IN SPOTS, ESPECIALLY IN BERKS COUNTY. THE RAIN WILL END FROM WEST TO EAST LATE THIS EVENING AND OVERNIGHT. * POOR DRAINAGE ROADWAY FLOODING WILL BE LIKELY WHERE THE HEAVIEST RAINS FALL. THERE IS ALSO THE POTENTIAL FOR LOCALIZED FLASH FLOODING ALONG SMALLER STREAMS...CREEKS AND URBANIZED AREAS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO A RAPID RISE OF WATER TO DANGEROUS LEVELS. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ DEZ001-MDZ008-012-NJZ008>010-012-015>019-PAZ070-071-101>106- 211000- /O.CON.KPHI.FF.A.0005.000000T0000Z-150821T1300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NEW CASTLE-CECIL-KENT MD-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX- MERCER-SALEM-GLOUCESTER-CAMDEN-NORTHWESTERN BURLINGTON-DELAWARE- PHILADELPHIA-WESTERN CHESTER-EASTERN CHESTER-WESTERN MONTGOMERY- EASTERN MONTGOMERY-UPPER BUCKS-LOWER BUCKS- INCLUDING THE CITIES OF...WILMINGTON...ELKTON...CHESTERTOWN... MORRISTOWN...FLEMINGTON...SOMERVILLE...NEW BRUNSWICK...TRENTON... PENNSVILLE...GLASSBORO...CAMDEN...CHERRY HILL...MOORESTOWN... MOUNT HOLLY...MEDIA...PHILADELPHIA...HONEY BROOK...OXFORD... WEST CHESTER...KENNETT SQUARE...COLLEGEVILLE...POTTSTOWN... NORRISTOWN...LANSDALE...CHALFONT...PERKASIE...MORRISVILLE... DOYLESTOWN 952 PM EDT THU AUG 20 2015 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 9 AM EDT FRIDAY... THE FLASH FLOOD WATCH CONTINUES FOR * PORTIONS OF NORTHERN DELAWARE...NORTHEAST MARYLAND...NEW JERSEY AND SOUTHEAST PENNSYLVANIA...INCLUDING THE FOLLOWING IN NORTHERN ...DELAWARE...NEW CASTLE. IN NORTHEAST MARYLAND... CECIL AND KENT MD. IN NEW JERSEY...CAMDEN...GLOUCESTER... HUNTERDON...MERCER...MIDDLESEX...MORRIS...NORTHWESTERN BURLINGTON...SALEM AND SOMERSET. IN SOUTHEAST PENNSYLVANIA... DELAWARE...EASTERN CHESTER...EASTERN MONTGOMERY...LOWER BUCKS...PHILADELPHIA...UPPER BUCKS...WESTERN CHESTER AND WESTERN MONTGOMERY. * UNTIL 9 AM EDT FRIDAY * NUMEROUS SHOWERS AND EMBEDDED THUNDERSTORMS WILL MOVE THROUGH THE AREA THIS EVENING BEFORE ENDING FROM WEST TO EAST OVERNIGHT. SOME OF THE HEAVIER SHOWERS AND THUNDERSTORMS WILL BE CAPABLE OF PRODUCING RAINFALL RATES UP TO 2 INCHES PER HOUR. * POOR DRAINAGE ROADWAY FLOODING WILL BE LIKELY WHERE THE HEAVIEST RAINS FALL. THERE IS ALSO THE POTENTIAL FOR LOCALIZED FLASH FLOODING ALONG SMALLER STREAMS...CREEKS AND URBANIZED AREAS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO A RAPID RISE OF WATER TO DANGEROUS LEVELS. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$
380 WGUS61 KPHI 210739 FFAPHI FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 339 AM EDT FRI AUG 21 2015 DEZ001-MDZ008-012-NJZ008>010-012-015>019-PAZ070-071-101>106- 210845- /O.CAN.KPHI.FF.A.0005.000000T0000Z-150821T1300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NEW CASTLE-CECIL-KENT MD-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX- MERCER-SALEM-GLOUCESTER-CAMDEN-NORTHWESTERN BURLINGTON-DELAWARE- PHILADELPHIA-WESTERN CHESTER-EASTERN CHESTER-WESTERN MONTGOMERY- EASTERN MONTGOMERY-UPPER BUCKS-LOWER BUCKS- INCLUDING THE CITIES OF...WILMINGTON...ELKTON...CHESTERTOWN... MORRISTOWN...FLEMINGTON...SOMERVILLE...NEW BRUNSWICK...TRENTON... PENNSVILLE...GLASSBORO...CAMDEN...CHERRY HILL...MOORESTOWN... MOUNT HOLLY...MEDIA...PHILADELPHIA...HONEY BROOK...OXFORD... WEST CHESTER...KENNETT SQUARE...COLLEGEVILLE...POTTSTOWN... NORRISTOWN...LANSDALE...CHALFONT...PERKASIE...MORRISVILLE... DOYLESTOWN 339 AM EDT FRI AUG 21 2015 ...FLASH FLOOD WATCH IS CANCELLED... THE FLASH FLOOD WATCH FOR PORTIONS OF NORTHERN DELAWARE... NORTHEAST MARYLAND...NEW JERSEY AND SOUTHEAST PENNSYLVANIA HAS BEEN CANCELLED. MOST OF THE HEAVY RAIN THREAT HAS SHIFTED EAST. THOUGH THERE REMAINS ONE LINGERING LINE OF HEAVER RAIN IN CENTRAL AND SOUTHERN NEW JERSEY. ANY LINGERING HEAVY RAIN THREAT SHOULD BE ISOLATED. $$ NJZ001-007-PAZ054-055-060>062-210845- /O.CAN.KPHI.FF.A.0005.000000T0000Z-150821T0800Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SUSSEX-WARREN-CARBON-MONROE-BERKS-LEHIGH-NORTHAMPTON- INCLUDING THE CITIES OF...NEWTON...WASHINGTON...JIM THORPE... STROUDSBURG...READING...ALLENTOWN...BETHLEHEM...EASTON 339 AM EDT FRI AUG 21 2015 ...FLASH FLOOD WATCH IS CANCELLED... THE FLASH FLOOD WATCH FOR PORTIONS OF NORTHERN NEW JERSEY AND PENNSYLVANIA HAS BEEN CANCELLED. THE HEAVY RAIN THREAT HAS SHIFTED EAST OF THE WATCH AREA. $$
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 5:31 PM EDT | Areal Flood Advisory | PHI | Berks | 6 hr |
| Aug 20, 5:43 PM EDT | Special Weather Statement | PHI | Berks | 47 min |
| Aug 20, 7:14 PM EDT | Areal Flood Advisory | PHI | Chester | 4 hr |
| Aug 20, 1:53 PM EDT | Special Weather Statement | PHI | Caroline | 37 min |
| Aug 20, 3:26 PM EDT | Special Weather Statement | PHI | Cecil | 49 min |
| Aug 20, 2:29 PM EDT | Special Weather Statement | PHI | Kent, Sussex | 46 min |
Nearby
Flash Flood Watches in New Jersey, 2015Flash Flood Watches in Pennsylvania, 2015Flash Flood Watches in Maryland, 2015Every flash flood watch in 2015
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.