Alert archive / New Jersey / Flash Flood Watches in 2011
Flash Flood Watch 8, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood watch at Aug 21, 2011, 3:28 AM EDT for 4 states. It took effect at Aug 21, 2011, 2:00 PM EDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Aug 21, 2011, 3:28 AM EDT (07:28 UTC)
- In effect from
- Aug 21, 2011, 2:00 PM EDT
- Expired
- Aug 21, 2011, 8:48 PM EDT
- In force
- 7 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Flood severity
- None
Counties New Castle County, DE, Cecil County, MD, Kent County, MD, Burlington County, NJ, Camden County, NJ, Cumberland 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, Delaware County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 59 km from the middle of the area, began a volume at 07:27 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, 7.5 hours before the alert went out and 207 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
- 122 J/kg
- Mixed-layer CIN
- -64 J/kg
- Mixed-layer LCL
- 1157 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 39 m²/s²
- 0-3 km storm-relative helicity
- 41 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
877 WGUS61 KPHI 210728 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 328 AM EDT SUN AUG 21 2011 NJZ001-007>010-012-212100- /O.NEW.KPHI.FF.A.0008.110821T1800Z-110822T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX- INCLUDING THE CITIES OF...NEWTON...WASHINGTON...MORRISTOWN... FLEMINGTON...SOMERVILLE...NEW BRUNSWICK 328 AM EDT SUN AUG 21 2011 ...FLASH FLOOD WATCH IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH LATE TONIGHT... THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A * FLASH FLOOD WATCH FOR PORTIONS OF NORTHERN NEW JERSEY AND NORTHWEST NEW JERSEY...INCLUDING THE FOLLOWING AREAS...IN NORTHERN NEW JERSEY...MIDDLESEX...MORRIS...SOMERSET...SUSSEX AND WARREN. IN NORTHWEST NEW JERSEY...HUNTERDON. * FROM 2 PM EDT THIS AFTERNOON THROUGH LATE TONIGHT * SHOWERS AND THUNDERSTORMS DEVELOPING AHEAD OF A STRONG COLD FRONT ARE EXPECTED TO PRODUCE LOCALLY HEAVY RAINFALL THIS AFTERNOON AND TONIGHT. THE RECENT RAINFALL HAS LEFT THE WATCH AREA VULNERABLE TO HEAVY RAINFALL...AND ANY ADDITIONAL HEAVY RAIN MAY LEAD TO LOCALIZED FLASH FLOODING. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$
3 follow-up statements
123 WGUS61 KPHI 211524 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1124 AM EDT SUN AUG 21 2011 DEZ001-MDZ008-012-NJZ015>019-021-PAZ067>071-212200- /O.EXA.KPHI.FF.A.0008.110821T1800Z-110822T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NEW CASTLE-CECIL-KENT MD-MERCER-SALEM-GLOUCESTER-CAMDEN- NORTHWESTERN BURLINGTON-CUMBERLAND-CHESTER-MONTGOMERY-BUCKS- DELAWARE-PHILADELPHIA- INCLUDING THE CITIES OF...WILMINGTON...ELKTON...CHESTERTOWN... TRENTON...PENNSVILLE...GLASSBORO...CAMDEN...CHERRY HILL... MOORESTOWN...MOUNT HOLLY...MILLVILLE...WEST CHESTER... NORRISTOWN...DOYLESTOWN...MEDIA...PHILADELPHIA 1124 AM EDT SUN AUG 21 2011 ...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT... THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS EXPANDED THE * FLASH FLOOD WATCH TO INCLUDE PORTIONS OF NORTHERN DELAWARE... NORTHEAST MARYLAND...NEW JERSEY AND SOUTHEAST PENNSYLVANIA... INCLUDING THE FOLLOWING AREAS...IN NORTHERN DELAWARE...NEW CASTLE. IN NORTHEAST MARYLAND...CECIL AND KENT MD. IN NEW JERSEY...CAMDEN...CUMBERLAND...GLOUCESTER...MERCER... NORTHWESTERN BURLINGTON AND SALEM. IN SOUTHEAST PENNSYLVANIA... BUCKS...CHESTER...DELAWARE...MONTGOMERY AND PHILADELPHIA. * THROUGH LATE TONIGHT. * SEVERAL ROUNDS OF SHOWERS AND THUNDERSTORMS DURING THE PAST WEEK OR SO HAVE SATURATED THE GROUND IN THE WATCH AREA. ADDITIONAL DOWNPOURS CAN BE EXPECTED FROM THUNDERSTORMS INTO TONIGHT. THIS MAY LEAD TO FLASH FLOODING. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ NJZ001-007>010-012-212200- /O.CON.KPHI.FF.A.0008.110821T1800Z-110822T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX- INCLUDING THE CITIES OF...NEWTON...WASHINGTON...MORRISTOWN... FLEMINGTON...SOMERVILLE...NEW BRUNSWICK 1124 AM EDT SUN AUG 21 2011 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TONIGHT... THE FLASH FLOOD WATCH CONTINUES FOR * PORTIONS OF NORTHERN NEW JERSEY AND NORTHWEST NEW JERSEY... INCLUDING THE FOLLOWING AREAS...IN NORTHERN NEW JERSEY... MIDDLESEX...MORRIS...SOMERSET...SUSSEX AND WARREN. IN NORTHWEST NEW JERSEY...HUNTERDON. * THROUGH LATE TONIGHT * SEVERAL ROUNDS OF SHOWERS AND THUNDERSTORMS DURING THE PAST WEEK OR SO HAVE SATURATED THE GROUND IN THE WATCH AREA. ADDITIONAL DOWNPOURS CAN BE EXPECTED FROM THUNDERSTORMS INTO TONIGHT. THIS MAY LEAD TO FLASH FLOODING. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ GORSE
237 WGUS61 KPHI 212005 FFAPHI FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 405 PM EDT SUN AUG 21 2011 DEZ001-MDZ008-012-NJZ001-007>010-012-015>019-021-PAZ067>071- 220600- /O.CON.KPHI.FF.A.0008.000000T0000Z-110822T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NEW CASTLE-CECIL-KENT MD-SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET- MIDDLESEX-MERCER-SALEM-GLOUCESTER-CAMDEN-NORTHWESTERN BURLINGTON- CUMBERLAND-CHESTER-MONTGOMERY-BUCKS-DELAWARE-PHILADELPHIA- INCLUDING THE CITIES OF...WILMINGTON...ELKTON...CHESTERTOWN... NEWTON...WASHINGTON...MORRISTOWN...FLEMINGTON...SOMERVILLE... NEW BRUNSWICK...TRENTON...PENNSVILLE...GLASSBORO...CAMDEN... CHERRY HILL...MOORESTOWN...MOUNT HOLLY...MILLVILLE... WEST CHESTER...NORRISTOWN...DOYLESTOWN...MEDIA...PHILADELPHIA 405 PM EDT SUN AUG 21 2011 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 2 AM EDT MONDAY... THE FLASH FLOOD WATCH CONTINUES FOR * PORTIONS OF NORTHERN DELAWARE...NORTHEAST MARYLAND...NEW JERSEY AND SOUTHEAST PENNSYLVANIA...INCLUDING THE FOLLOWING AREAS...IN NORTHERN DELAWARE...NEW CASTLE. IN NORTHEAST MARYLAND...CECIL AND KENT MD. IN NEW JERSEY...CAMDEN... CUMBERLAND...GLOUCESTER...HUNTERDON...MERCER...MIDDLESEX... MORRIS...NORTHWESTERN BURLINGTON...SALEM...SOMERSET...SUSSEX AND WARREN. IN SOUTHEAST PENNSYLVANIA...BUCKS...CHESTER... DELAWARE...MONTGOMERY AND PHILADELPHIA. * UNTIL 2 AM EDT MONDAY. * SEVERAL ROUNDS OF SHOWERS AND THUNDERSTORMS DURING THE PAST WEEK OR SO HAVE SATURATED THE GROUND IN THE WATCH AREA. ADDITIONAL SHOWERS AND STORMS THROUGH THIS EVENING WILL LOCALLY PRODUCE RAINFALL RATES OF 1 TO 2 INCHES PER HOUR. THIS MAY LEAD TO FLASH FLOODING. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ GORSE
382 WGUS61 KPHI 220048 FFAPHI FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 848 PM EDT SUN AUG 21 2011 DEZ001-MDZ008-012-NJZ001-007>010-012-015>019-021-PAZ067>071- 220200- /O.CAN.KPHI.FF.A.0008.000000T0000Z-110822T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NEW CASTLE-CECIL-KENT MD-SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET- MIDDLESEX-MERCER-SALEM-GLOUCESTER-CAMDEN-NORTHWESTERN BURLINGTON- CUMBERLAND-CHESTER-MONTGOMERY-BUCKS-DELAWARE-PHILADELPHIA- INCLUDING THE CITIES OF...WILMINGTON...ELKTON...CHESTERTOWN... NEWTON...WASHINGTON...MORRISTOWN...FLEMINGTON...SOMERVILLE... NEW BRUNSWICK...TRENTON...PENNSVILLE...GLASSBORO...CAMDEN... CHERRY HILL...MOORESTOWN...MOUNT HOLLY...MILLVILLE... WEST CHESTER...NORRISTOWN...DOYLESTOWN...MEDIA...PHILADELPHIA 848 PM EDT SUN AUG 21 2011 ...FLASH FLOOD WATCH IS CANCELLED... THE FLASH FLOOD WATCH FOR PORTIONS OF NORTHERN DELAWARE... NORTHEAST MARYLAND...NEW JERSEY AND SOUTHEAST PENNSYLVANIA HAS BEEN CANCELLED. SOME SHOWERS AND THUNDERSTORMS WILL LINGER FOR AWHILE TONIGHT, HOWEVER THE DURATION AND INTENSITY ARE EXPECTED TO BE LESS. THEREFORE, THE FLASH FLOOD WATCH HAS BEEN CANCELLED. $$ GORSE
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 3:24 AM EDT | Small Craft Advisory | PHI | 30 hr | |
| Aug 21, 8:41 AM EDT | Special Weather Statement | PHI | Salem | 64 min |
| Aug 21, 10:33 AM EDT | Special Marine Warning | PHI | 57 min | |
| Aug 21, 11:07 AM EDT | Special Marine Warning | PHI | 83 min | |
| Aug 21, 12:20 PM EDT | Special Weather Statement | PHI | Morris | 55 min |
| Aug 21, 12:33 PM EDT | Severe Thunderstorm Warning | PHI | Morris | 33 min |
| Aug 21, 12:39 PM EDT | Special Weather Statement | PHI | Burlington, Camden | 66 min |
| Aug 21, 1:47 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Mercer | 58 min |
| Aug 21, 2:33 PM EDT | Areal Flood Advisory | PHI | Burlington, Camden, Mercer | 117 min |
| Aug 21, 2:43 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Gloucester, Mercer | 62 min |
| Aug 21, 3:08 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Middlesex, Monmouth, Ocean | 67 min |
| Aug 21, 3:21 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth, Ocean | 54 min |
| Aug 21, 3:22 PM EDT | Special Marine Warning | PHI | 83 min | |
| Aug 21, 3:46 PM EDT | Flash Flood Warning | PHI | Burlington | 2 hr |
| Aug 21, 4:14 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth, Ocean | 46 min |
| Aug 21, 4:26 PM EDT | Special Marine Warning | PHI | 57 min | |
| Aug 21, 4:35 PM EDT | Areal Flood Advisory | PHI | Burlington, Camden, Mercer, Middlesex, Monmouth, Ocean | 3 hr |
| Aug 21, 5:44 PM EDT | Special Weather Statement | PHI | Mercer | 61 min |
| Aug 21, 6:05 PM EDT | Flash Flood Warning | PHI | Burlington | 6 hr |
| Aug 21, 6:12 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Middlesex, Monmouth, Ocean | 63 min |
| Aug 21, 6:20 PM EDT | Special Weather Statement | PHI | Hunterdon | 55 min |
| Aug 21, 6:54 PM EDT | Areal Flood Advisory | PHI | Hunterdon, Middlesex, Morris, Somerset, Sussex, Warren | 111 min |
| Aug 21, 7:08 PM EDT | Special Weather Statement | PHI | Hunterdon, Middlesex, Somerset | 52 min |
| Aug 21, 7:18 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth, Ocean | 42 min |
| Aug 21, 7:21 PM EDT | Special Marine Warning | PHI | 84 min | |
| Aug 21, 7:24 PM EDT | Flash Flood Warning | PHI | Mercer, Monmouth, Ocean | 5 hr |
| Aug 21, 7:35 PM EDT | Areal Flood Advisory | PHI | Burlington, Mercer, Middlesex, Monmouth, Ocean | 115 min |
| Aug 21, 1:11 PM EDT | Special Weather Statement | PHI | Montgomery | 64 min |
| Aug 21, 1:25 PM EDT | Areal Flood Advisory | PHI | Bucks, Chester, Montgomery | 110 min |
| Aug 21, 3:31 PM EDT | Flash Flood Warning | PHI | Philadelphia | 8 hr |
| Aug 21, 4:11 PM EDT | Special Weather Statement | PHI | Carbon, Monroe | 64 min |
| Aug 21, 4:19 PM EDT | Areal Flood Advisory | PHI | Carbon, Monroe | 3 hr |
| Aug 21, 4:53 PM EDT | Special Weather Statement | PHI | Lehigh, Northampton | 67 min |
| Aug 21, 6:41 PM EDT | Special Weather Statement | PHI | Berks | 64 min |
| Aug 21, 8:01 AM EDT | Special Weather Statement | PHI | Cecil, Kent | 59 min |
| Aug 21, 9:08 AM EDT | Special Weather Statement | PHI | Cecil, Kent | 52 min |
| Aug 21, 9:36 AM EDT | Areal Flood Advisory | PHI | Cecil, Kent, Queen Anne's | 2 hr |
| Aug 21, 2:01 PM EDT | Severe Thunderstorm Warning | PHI | Cecil, Kent, Queen Anne's | 59 min |
| Aug 21, 2:43 PM EDT | Areal Flood Advisory | PHI | Cecil, Kent, Queen Anne's | 3 hr |
| Aug 21, 2:55 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Queen Anne's, Talbot | 65 min |
| Aug 21, 3:11 PM EDT | Areal Flood Advisory | PHI | Kent, Queen Anne's | 2 hr |
| Aug 21, 4:03 PM EDT | Special Weather Statement | PHI | Caroline, Kent, Queen Anne's, Talbot | 57 min |
| Aug 21, 4:45 PM EDT | Flash Flood Warning | PHI | Kent | 3 hr |
| Aug 21, 5:09 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 37 min |
| Aug 21, 5:20 PM EDT | Areal Flood Advisory | PHI | Caroline, Queen Anne's, Talbot | 115 min |
| Aug 21, 7:17 PM EDT | Areal Flood Advisory | PHI | Caroline | 118 min |
| Aug 21, 9:19 AM EDT | Special Weather Statement | PHI | Kent | 56 min |
| Aug 21, 10:15 AM EDT | Special Weather Statement | PHI | Kent | 60 min |
| Aug 21, 10:33 AM EDT | Severe Thunderstorm Warning | PHI | Kent | 57 min |
| Aug 21, 6:29 PM EDT | Special Weather Statement | PHI | Sussex | 61 min |
| Aug 21, 7:03 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 42 min |
Nearby
Flash Flood Watches in New Jersey, 2011Flash Flood Watches in Pennsylvania, 2011Flash Flood Watches in Maryland, 2011Every flash flood watch in 2011
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.