Alert archive / Pennsylvania / Flash Flood Watches in 2011
Flash Flood Watch 5, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood watch at Aug 7, 2011, 6:03 AM EDT for 5 counties in Pennsylvania; Sussex County, Warren County, New Jersey. It took effect at Aug 7, 2011, 10:00 AM EDT. It was in force for 10 hr.
The area
The counties it named.
The facts
- Issued
- Aug 7, 2011, 6:03 AM EDT (10:03 UTC)
- In effect from
- Aug 7, 2011, 10:00 AM EDT
- Expired
- Aug 7, 2011, 8:00 PM EDT
- In force
- 10 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Flood severity
- None
Counties Sussex County, NJ, Warren County, NJ, Berks County, PA, Carbon County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 127 km from the middle of the area, began a volume at 10:04 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, 10.1 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
- 5 J/kg
- Mixed-layer CIN
- -208 J/kg
- Mixed-layer LCL
- 889 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 120 m²/s²
- 0-3 km storm-relative helicity
- 174 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
242 WGUS61 KPHI 071003 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 603 AM EDT SUN AUG 7 2011 ...FLASHING FLOODING IS POSSIBLE TODAY INTO THIS EVENING... .SCATERED SHOWERS AND THUNDERSTORMS DEVELOPING AHEAD OF A COLD FRONT MAY PRODUCE HEAVY RAINFALL TODAY AND EARLY THIS EVENING. PORTIONS OF THE LEHIGH VALLEY...SOUTHERN POCONOS AND NORTHWEST NEW JERSEY RECEIVED BETWEEN TWO AND ONE-HALF AND SIX AND ONE-HALF INCHES OF RAIN SATURDAY AFTERNOON INTO EARLY THIS MORNING. ADDITIONAL RAIN WITH SHOWERS AND THUNDERSTORMS COULD PRODUCE FLASH FLOODING IN THESE AREAS. NJZ001-007-PAZ054-055-072030- /O.CAN.KPHI.FA.A.0009.000000T0000Z-110807T1000Z/ /O.NEW.KPHI.FF.A.0005.110807T1400Z-110808T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SUSSEX-WARREN-CARBON-MONROE- INCLUDING THE CITIES OF...NEWTON...WASHINGTON...JIM THORPE... STROUDSBURG 603 AM EDT SUN AUG 7 2011 ...FLASH FLOOD WATCH IN EFFECT FROM 10 AM EDT THIS MORNING THROUGH THIS EVENING... ...FLOOD WATCH IS CANCELLED... THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A * FLASH FLOOD WATCH FOR PORTIONS OF NORTHERN NEW JERSEY AND NORTHEAST PENNSYLVANIA...INCLUDING THE FOLLOWING AREAS...IN NORTHERN NEW JERSEY...SUSSEX AND WARREN. IN NORTHEAST PENNSYLVANIA...CARBON AND MONROE. * FROM 10 AM EDT THIS MORNING THROUGH THIS EVENING * THE WATCH AREA RECEIVED BETWEEN ONE AND ONE-HALF AND THREE INCHES OF RAIN SATURDAY AFTERNOON INTO EARLY THIS MORNING. SCATTERED SHOWERS AND THUNDERSTORMS HAVE THE POTENTIAL TO PRODUCE HEAVY RAIN LATER THIS MORNING INTO EARLY THIS EVENING. * ADDITIONAL RAINFALL IN THESE AREAS COULD PRODUCE FLASH FLOODING. THE BEST CHANCE OF SHOWERS AND THUNDERSTORMS WILL BE THIS AFTERNOON AND THIS EVENING. 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. && THE FLOOD WATCH FOR PORTIONS OF NORTHERN NEW JERSEY AND NORTHEAST PENNSYLVANIA HAS BEEN CANCELLED. THE HEAVIEST RAIN HAS MOVED OUT OF THE AREA. THERE IS POTENTIAL FOR MORE FLOODING LATER TODAY AND THIS EVENING. $$ NJZ008-071115- /O.CAN.KPHI.FA.A.0009.000000T0000Z-110807T1000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MORRIS- INCLUDING THE CITY OF...MORRISTOWN 603 AM EDT SUN AUG 7 2011 ...FLOOD WATCH IS CANCELLED... THE FLOOD WATCH FOR A PORTION OF NORTHERN NEW JERSEY HAS BEEN CANCELLED. THE HEAVIEST RAIN HAS MOVED OUT OF THE AREA...AND THE THREAT FOR FLOODING HAS DIMINISHED. $$ PAZ060>062-072030- /O.NEW.KPHI.FF.A.0005.110807T1400Z-110808T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BERKS-LEHIGH-NORTHAMPTON- INCLUDING THE CITIES OF...READING...ALLENTOWN...BETHLEHEM... EASTON 603 AM EDT SUN AUG 7 2011 ...FLASH FLOOD WATCH IN EFFECT FROM 10 AM EDT THIS MORNING THROUGH THIS EVENING... THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A * FLASH FLOOD WATCH FOR A PORTION OF EAST CENTRAL PENNSYLVANIA... INCLUDING THE FOLLOWING AREAS...BERKS...LEHIGH AND NORTHAMPTON. * FROM 10 AM EDT THIS MORNING THROUGH THIS EVENING * THE WATCH AREA RECEIVED BETWEEN TWO AND ONE-HALF AND SIX AND ONE-HALF INCHES OF RAIN SATURDAY AFTERNOON INTO EARLY THIS MORNING. SCATTERED SHOWERS AND THUNDERSTORMS HAVE THE POTENTIAL TO PRODUCE HEAVY RAIN LATER THIS MORNING INTO EARLY THIS EVENING. * ADDITIONAL RAINFALL IN THESE AREAS COULD PRODUCE FLASH FLOODING. THE BEST CHANCE OF SHOWERS AND THUNDERSTORMS WILL BE THIS AFTERNOON AND THIS EVENING. 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. && $$
3 follow-up statements
602 WGUS61 KPHI 071755 FFAPHI FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 155 PM EDT SUN AUG 7 2011 ...FLASHING FLOODING IS POSSIBLE TODAY INTO THIS EVENING... .SCATERED SHOWERS AND THUNDERSTORMS DEVELOPING AHEAD OF A COLD FRONT MAY PRODUCE HEAVY RAINFALL THIS AFTERNOON AND EARLY THIS EVENING. PORTIONS OF THE LEHIGH VALLEY...SOUTHERN POCONOS AND NORTHWEST NEW JERSEY RECEIVED BETWEEN TWO AND ONE-HALF AND SIX AND ONE-HALF INCHES OF RAIN SATURDAY AFTERNOON INTO EARLY THIS MORNING. ADDITIONAL RAIN WITH SHOWERS AND THUNDERSTORMS COULD PRODUCE FLASH FLOODING IN THESE AREAS. NJZ001-007-PAZ054-055-060>062-080000- /O.CON.KPHI.FF.A.0005.000000T0000Z-110808T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SUSSEX-WARREN-CARBON-MONROE-BERKS-LEHIGH-NORTHAMPTON- INCLUDING THE CITIES OF...NEWTON...WASHINGTON...JIM THORPE... STROUDSBURG...READING...ALLENTOWN...BETHLEHEM...EASTON 155 PM EDT SUN AUG 7 2011 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... THE FLASH FLOOD WATCH CONTINUES FOR * PORTIONS OF NORTHERN NEW JERSEY AND PENNSYLVANIA...INCLUDING THE FOLLOWING AREAS...IN NORTHERN NEW JERSEY...SUSSEX AND WARREN. IN PENNSYLVANIA...BERKS...CARBON...LEHIGH...MONROE AND NORTHAMPTON. * UNTIL 8 PM EDT THIS EVENING * THE WATCH AREA RECEIVED BETWEEN TWO AND ONE-HALF AND SIX AND ONE-HALF INCHES OF RAIN SATURDAY AFTERNOON INTO EARLY THIS MORNING. SCATTERED SHOWERS AND THUNDERSTORMS HAVE THE POTENTIAL TO PRODUCE HEAVY RAIN LATER THIS MORNING INTO EARLY THIS EVENING. * ADDITIONAL RAINFALL IN THESE AREAS COULD PRODUCE FLASH FLOODING. THE BEST CHANCE OF SHOWERS AND THUNDERSTORMS WILL BE THIS AFTERNOON AND THIS EVENING. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$
244 WGUS61 KPHI 071800 CCA FFAPHI FLOOD WATCH...CORRECTED NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 159 PM EDT SUN AUG 7 2011 ...FLASH FLOODING IS POSSIBLE THIS AFTERNOON INTO THIS EVENING... .SCATERED SHOWERS AND THUNDERSTORMS DEVELOPING AHEAD OF A COLD FRONT MAY PRODUCE HEAVY RAINFALL THIS AFTERNOON AND EARLY THIS EVENING. PORTIONS OF THE LEHIGH VALLEY...SOUTHERN POCONOS AND NORTHWEST NEW JERSEY RECEIVED BETWEEN TWO AND ONE-HALF AND SIX AND ONE-HALF INCHES OF RAIN SATURDAY AFTERNOON INTO EARLY THIS MORNING. ADDITIONAL RAIN WITH SHOWERS AND THUNDERSTORMS COULD PRODUCE FLASH FLOODING IN THESE AREAS. NJZ001-007-PAZ054-055-060>062-080000- /O.COR.KPHI.FF.A.0005.000000T0000Z-110808T0000Z/ /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 159 PM EDT SUN AUG 7 2011 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... THE FLASH FLOOD WATCH CONTINUES FOR * PORTIONS OF NORTHERN NEW JERSEY AND PENNSYLVANIA...INCLUDING THE FOLLOWING AREAS...IN NORTHERN NEW JERSEY...SUSSEX AND WARREN. IN PENNSYLVANIA...BERKS...CARBON...LEHIGH...MONROE AND NORTHAMPTON. * UNTIL 8 PM EDT THIS EVENING * THE WATCH AREA RECEIVED BETWEEN TWO AND ONE-HALF AND SIX AND ONE-HALF INCHES OF RAIN SATURDAY AFTERNOON INTO EARLY THIS MORNING. SCATTERED SHOWERS AND THUNDERSTORMS HAVE THE POTENTIAL TO PRODUCE HEAVY RAIN THIS AFTERNOON INTO EARLY THIS EVENING. * ADDITIONAL RAINFALL IN THESE AREAS COULD PRODUCE FLASH FLOODING. THE BEST CHANCE OF SHOWERS AND THUNDERSTORMS WILL BE THIS AFTERNOON AND THIS EVENING. 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. && $$
158 WGUS61 KPHI 080007 FFAPHI FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 807 PM EDT SUN AUG 7 2011 NJZ001-007-PAZ054-055-060>062-080115- /O.EXP.KPHI.FF.A.0005.000000T0000Z-110808T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SUSSEX-WARREN-CARBON-MONROE-BERKS-LEHIGH-NORTHAMPTON- INCLUDING THE CITIES OF...NEWTON...WASHINGTON...JIM THORPE... STROUDSBURG...READING...ALLENTOWN...BETHLEHEM...EASTON 807 PM EDT SUN AUG 7 2011 ...FLASH FLOOD WATCH HAS EXPIRED... THE FLASH FLOOD WATCH FOR PORTIONS OF NORTHERN NEW JERSEY AND PENNSYLVANIA HAS EXPIRED. SCATTERED HEAVY SHOWERS OCCURRED TODAY AND MAY STILL OCCUR UNTIL ABOUT 11 PM. THERE IS VERY LITTLE CHANCE OF ANY FLOODING EXCEPT POSSIBLY AN ISOLATED INSTANCE OF VERY BRIEF STREET FLOODING. $$ DRAG
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 6, 8:49 PM EDT | Flood Watch | PHI | Carbon, Monroe | 9 hr |
| Aug 6, 10:06 PM EDT | Special Weather Statement | PHI | Berks | 84 min |
| Aug 6, 10:14 PM EDT | Special Weather Statement | PHI | Pike | 61 min |
| Aug 6, 10:33 PM EDT | Areal Flood Advisory | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 6 hr |
| Aug 7, 12:48 AM EDT | Special Weather Statement | PHI | Montgomery | 57 min |
| Aug 7, 1:32 AM EDT | Areal Flood Advisory | PHI | Berks, Bucks, Chester, Montgomery, Northampton | 3 hr |
| Aug 7, 2:29 AM EDT | Flash Flood Warning | PHI | Berks, Lehigh, Northampton | 3 hr |
| Aug 7, 3:07 PM EDT | Special Weather Statement | PHI | Philadelphia | 23 min |
| Aug 7, 3:48 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 27 min |
| Aug 7, 7:20 PM EDT | Special Weather Statement | PHI | Monroe | 40 min |
| Aug 7, 12:42 AM EDT | Special Weather Statement | PHI | Morris | 63 min |
| Aug 7, 1:54 AM EDT | Areal Flood Advisory | PHI | Hunterdon, Morris, Sussex, Warren | 3 hr |
| Aug 7, 3:56 AM EDT | Special Weather Statement | PHI | Hunterdon | 64 min |
| Aug 7, 4:45 AM EDT | Special Weather Statement | PHI | Hunterdon, Somerset | 60 min |
| Aug 7, 5:10 AM EDT | Areal Flood Advisory | PHI | Morris, Somerset | 81 min |
| Aug 7, 5:30 AM EDT | Special Weather Statement | PHI | Mercer, Middlesex | 60 min |
| Aug 7, 3:25 PM EDT | Special Weather Statement | PHI | Mercer | 35 min |
| Aug 7, 3:34 PM EDT | Special Weather Statement | PHI | Warren | 26 min |
| Aug 7, 4:19 PM EDT | Special Weather Statement | PHI | Monmouth | 41 min |
| Aug 7, 5:02 PM EDT | Special Weather Statement | PHI | Sussex | 28 min |
| Aug 7, 6:49 PM EDT | Special Weather Statement | PHI | Sussex | 41 min |
| Aug 7, 7:11 PM EDT | Special Weather Statement | PHI | Sussex | 49 min |
| Aug 7, 7:35 PM EDT | Special Weather Statement | PHI | Sussex | 25 min |
Nearby
Flash Flood Watches in Pennsylvania, 2011Flash Flood Watches in New Jersey, 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.