Alert archive / Pennsylvania / Flood Watches in 2011
Flood Watch 1, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flood watch at Feb 24, 2011, 3:02 PM EST for 7 counties in Pennsylvania; 7 counties in New Jersey. It took effect at Feb 25, 2011, 3:44 AM EST. It was in force for 12 hr.
The area
The counties it named.
The facts
- Issued
- Feb 24, 2011, 3:02 PM EST (20:02 UTC)
- In effect from
- Feb 25, 2011, 3:44 AM EST
- Expired
- Feb 25, 2011, 3:38 PM EST
- In force
- 12 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Flood severity
- None
Counties Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Morris County, NJ, Somerset County, NJ, Sussex County, NJ, Warren County, NJ, Berks County, PA, Carbon County, PA, Delaware County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 93 km from the middle of the area, began a volume at 20:02 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
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.0 hours before the alert went out and 152 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
- 1519 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- 159 m²/s²
- 0-3 km storm-relative helicity
- 251 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
241 WGUS61 KPHI 242002 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 302 PM EST THU FEB 24 2011 ...FLOODING POSSIBLE FRIDAY INTO SATURDAY... .A LOW PRESSURE SYSTEM ACROSS THE LOWER MISSISSIPPI VALLEY WILL TRACK NORTHEAST AND MOVE THROUGH OUR AREA FRIDAY. THE LOW WILL BE ACCOMPANIED BY PERIODS OF MODERATE RAIN AND STRONG WINDS. THUNDERSTORMS ARE ALSO POSSIBLE WITH THE LOW. THESE THUNDERSTORMS, WITH THEIR BRIEF PERIODS OF INTENSE RAIN, ALONG WITH SNOWMELT, WILL ALSO ADD TO THE FLOOD THREAT. NJZ001-007>010-012-015-PAZ054-055-060>062-067>071-251115- /O.NEW.KPHI.FA.A.0001.110225T1200Z-110226T1300Z/ /00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-MERCER-CARBON- MONROE-BERKS-LEHIGH-NORTHAMPTON-CHESTER-MONTGOMERY-BUCKS-DELAWARE- PHILADELPHIA- INCLUDING THE CITIES OF...NEWTON...WASHINGTON...MORRISTOWN... FLEMINGTON...SOMERVILLE...NEW BRUNSWICK...TRENTON...JIM THORPE... STROUDSBURG...READING...ALLENTOWN...BETHLEHEM...EASTON... WEST CHESTER...NORRISTOWN...DOYLESTOWN...MEDIA...PHILADELPHIA 302 PM EST THU FEB 24 2011 ...FLOOD WATCH IN EFFECT FROM FRIDAY MORNING THROUGH SATURDAY MORNING... THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A * FLOOD WATCH FOR PORTIONS OF NEW JERSEY AND PENNSYLVANIA... INCLUDING THE FOLLOWING AREAS...IN NEW JERSEY...HUNTERDON... MERCER...MIDDLESEX...MORRIS...SOMERSET...SUSSEX AND WARREN. IN PENNSYLVANIA...BERKS...BUCKS...CARBON...CHESTER...DELAWARE... LEHIGH...MONROE...MONTGOMERY...NORTHAMPTON AND PHILADELPHIA. * FROM FRIDAY MORNING THROUGH SATURDAY MORNING * RAINFALL AMOUNTS OF ONE OR TWO INCHES ARE POSSIBLE DURING THE WATCH PERIOD, WITH THE HEAVIEST RAIN FALLING FROM FRIDAY'S PRE- DAWN HOURS THROUGH THE MID-AFTERNOON HOURS. * OF THE LARGER RIVERS IN THE WATCH AREA, THE PASSAIC AND RARITAN WILL SEE THE GREATEST RISE IN WATER LEVELS WITH THIS EVENT AND NEED TO BE MONITORED. FLOODING IS NOT EXPECTED ALONG THE DELAWARE, THE LEHIGH OR THE SCHUYLKILL RIVER. FLOODING IS MORE PROBABLE ALONG SMALLER CREEKS AND STREAMS AND IN AREAS OF POOR DRAINAGE WHERE THE HYDROLOGIC RESPONSE IS ALWAYS GREATER. SNOWMELT AND THUNDERSTORMS COULD ALSO ADD TO THE FLOOD THREAT. ALTHOUGH THE RAIN WILL COME TO AN END BY FRIDAY EVENING, SOME OF THE STREAMS AND RIVERS WILL NOT CREST UNTIL SATURDAY. STAY INFORMED AFTER THE RAINS END FRIDAY. THE FLOOD THREAT COULD BE DELAYED AND OCCUR AT A LATER TIME. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLOOD WATCH MEANS THERE IS A POTENTIAL FOR FLOODING BASED ON CURRENT FORECASTS. YOU SHOULD MONITOR LATER FORECASTS AND BE ALERT FOR POSSIBLE FLOOD WARNINGS. THOSE LIVING IN AREAS PRONE TO FLOODING SHOULD BE PREPARED TO TAKE ACTION SHOULD FLOODING DEVELOP. && $$ KRUZDLO
3 follow-up statements
614 WGUS61 KPHI 250844 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 344 AM EST FRI FEB 25 2011 ...FLOODING POSSIBLE FRIDAY INTO SATURDAY... .A LOW PRESSURE SYSTEM WILL MOVE THROUGH OUR AREA TODAY. THE LOW WILL BE ACCOMPANIED BY PERIODS OF MODERATE RAIN AND STRONG WINDS. THUNDERSTORMS ARE ALSO POSSIBLE WITH THE LOW THIS AFTERNOON. THESE THUNDERSTORMS...WITH THEIR BRIEF PERIODS OF INTENSE RAIN... ALONG WITH SNOWMELT...WILL ALSO ADD TO THE FLOOD THREAT. NJZ001-007>010-012-015-PAZ054-055-060>062-067>071-252100- /O.EXT.KPHI.FA.A.0001.110225T0844Z-110226T1300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-MERCER-CARBON- MONROE-BERKS-LEHIGH-NORTHAMPTON-CHESTER-MONTGOMERY-BUCKS-DELAWARE- PHILADELPHIA- INCLUDING THE CITIES OF...NEWTON...WASHINGTON...MORRISTOWN... FLEMINGTON...SOMERVILLE...NEW BRUNSWICK...TRENTON...JIM THORPE... STROUDSBURG...READING...ALLENTOWN...BETHLEHEM...EASTON... WEST CHESTER...NORRISTOWN...DOYLESTOWN...MEDIA...PHILADELPHIA 344 AM EST FRI FEB 25 2011 ...FLOOD WATCH NOW IN EFFECT THROUGH SATURDAY MORNING... THE FLOOD WATCH IS NOW IN EFFECT FOR * PORTIONS OF NEW JERSEY AND PENNSYLVANIA...INCLUDING THE FOLLOWING AREAS...IN NEW JERSEY...HUNTERDON...MERCER... MIDDLESEX...MORRIS...SOMERSET...SUSSEX AND WARREN. IN PENNSYLVANIA...BERKS...BUCKS...CARBON...CHESTER...DELAWARE... LEHIGH...MONROE...MONTGOMERY...NORTHAMPTON AND PHILADELPHIA. * THROUGH SATURDAY MORNING * RAINFALL AMOUNTS OF ONE OR TWO INCHES ARE POSSIBLE DURING THE WATCH PERIOD...WITH THE HEAVIEST RAIN FALLING FROM THE PRE-DAWN HOURS THROUGH THE MID-AFTERNOON HOURS. * OF THE LARGER RIVERS IN THE WATCH AREA... THE PASSAIC AND RARITAN WILL SEE THE GREATEST RISE IN WATER LEVELS WITH THIS EVENT AND NEED TO BE MONITORED. FLOODING IS NOT EXPECTED ALONG THE DELAWARE... THE LEHIGH OR THE SCHUYLKILL RIVER. FLOODING IS MORE PROBABLE ALONG SMALLER CREEKS AND STREAMS AND IN AREAS OF POOR DRAINAGE WHERE THE HYDROLOGIC RESPONSE IS ALWAYS GREATER. SNOWMELT AND THUNDERSTORMS COULD ALSO ADD TO THE FLOOD THREAT. ALTHOUGH THE RAIN WILL COME TO AN END BY FRIDAY EVENING... SOME OF THE STREAMS AND RIVERS WILL NOT CREST UNTIL SATURDAY. STAY INFORMED AFTER THE RAINS END FRIDAY. THE FLOOD THREAT COULD BE DELAYED AND OCCUR AT A LATER TIME. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLOOD WATCH MEANS THERE IS A POTENTIAL FOR FLOODING BASED ON CURRENT FORECASTS. YOU SHOULD MONITOR LATER FORECASTS AND BE ALERT FOR POSSIBLE FLOOD WARNINGS. THOSE LIVING IN AREAS PRONE TO FLOODING SHOULD BE PREPARED TO TAKE ACTION SHOULD FLOODING DEVELOP. && $$ ROBERTSON/KRUZDLO
431 WGUS61 KPHI 251501 FFAPHI FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1001 AM EST FRI FEB 25 2011 ...FLOODING POSSIBLE FRIDAY INTO SATURDAY... .A LOW PRESSURE SYSTEM WILL MOVE THROUGH OUR AREA TODAY. THE LOW WILL BE ACCOMPANIED BY PERIODS OF MODERATE RAIN AND STRONG WINDS. THUNDERSTORMS ARE ALSO POSSIBLE WITH THE LOW THIS AFTERNOON. THESE THUNDERSTORMS...WITH THEIR BRIEF PERIODS OF INTENSE RAIN... ALONG WITH SNOW MELT...WILL ALSO ADD TO THE FLOOD THREAT. PAZ054-055-060>062-067>071-251615- /O.CAN.KPHI.FA.A.0001.000000T0000Z-110226T1300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CARBON-MONROE-BERKS-LEHIGH-NORTHAMPTON-CHESTER-MONTGOMERY-BUCKS- DELAWARE-PHILADELPHIA- INCLUDING THE CITIES OF...JIM THORPE...STROUDSBURG...READING... ALLENTOWN...BETHLEHEM...EASTON...WEST CHESTER...NORRISTOWN... DOYLESTOWN...MEDIA...PHILADELPHIA 1001 AM EST FRI FEB 25 2011 ...FLOOD WATCH IS CANCELLED... THE FLOOD WATCH FOR PORTIONS OF EAST CENTRAL PENNSYLVANIA... NORTHEAST PENNSYLVANIA AND SOUTHEAST PENNSYLVANIA HAS BEEN CANCELLED. MOST OF THE RAINFALL OVER THIS AREA HAS ENDED. ANY ADDITIONAL RAINFALL AMOUNTS ARE EXPECTED TO BE INSUFFICIENT TO CAUSE FLOODING. $$ NJZ001-007>010-012-015-252315- /O.CON.KPHI.FA.A.0001.000000T0000Z-110226T1300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-MERCER- INCLUDING THE CITIES OF...NEWTON...WASHINGTON...MORRISTOWN... FLEMINGTON...SOMERVILLE...NEW BRUNSWICK...TRENTON 1001 AM EST FRI FEB 25 2011 ...FLOOD WATCH REMAINS IN EFFECT THROUGH SATURDAY MORNING... THE FLOOD WATCH CONTINUES FOR * PORTIONS OF CENTRAL NEW JERSEY...NORTHERN NEW JERSEY AND NORTHWEST NEW JERSEY...INCLUDING THE FOLLOWING AREAS...IN CENTRAL NEW JERSEY...MERCER. IN NORTHERN NEW JERSEY... MIDDLESEX...MORRIS...SOMERSET...SUSSEX AND WARREN. IN NORTHWEST NEW JERSEY...HUNTERDON. * THROUGH SATURDAY MORNING * ADDITIONAL RAINFALL AMOUNTS UP TO ONE INCH ARE POSSIBLE DURING THE WATCH PERIOD...WITH THE HEAVIEST RAIN FALLING THROUGH THE MID-AFTERNOON HOURS. * OF THE LARGER RIVERS IN THE WATCH AREA... THE PASSAIC AND RARITAN WILL SEE THE GREATEST RISE IN WATER LEVELS WITH THIS EVENT AND NEED TO BE MONITORED. FLOODING IS NOT EXPECTED ALONG THE DELAWARE RIVER. FLOODING IS MORE PROBABLE ALONG SMALLER CREEKS AND STREAMS AND IN AREAS OF POOR DRAINAGE WHERE THE HYDROLOGIC RESPONSE IS ALWAYS GREATER. SNOW MELT AND THUNDERSTORMS COULD ALSO ADD TO THE FLOOD THREAT. ALTHOUGH THE RAIN WILL COME TO AN END BY THIS EVENING... SOME OF THE STREAMS AND RIVERS WILL NOT CREST UNTIL SATURDAY. STAY INFORMED AFTER THE RAINS END FRIDAY. THE FLOOD THREAT COULD BE DELAYED AND OCCUR AT A LATER TIME. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLOOD WATCH MEANS THERE IS A POTENTIAL FOR FLOODING BASED ON CURRENT FORECASTS. YOU SHOULD MONITOR LATER FORECASTS AND BE ALERT FOR POSSIBLE FLOOD WARNINGS. THOSE LIVING IN AREAS PRONE TO FLOODING SHOULD BE PREPARED TO TAKE ACTION SHOULD FLOODING DEVELOP. && $$
904 WGUS61 KPHI 252038 FFAPHI FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 338 PM EST FRI FEB 25 2011 NJZ001-007>010-012-015-252145- /O.CAN.KPHI.FA.A.0001.000000T0000Z-110226T1300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-MERCER- INCLUDING THE CITIES OF...NEWTON...WASHINGTON...MORRISTOWN... FLEMINGTON...SOMERVILLE...NEW BRUNSWICK...TRENTON 338 PM EST FRI FEB 25 2011 ...FLOOD WATCH IS CANCELLED... THE FLOOD WATCH FOR PORTIONS OF CENTRAL NEW JERSEY...NORTHERN NEW JERSEY AND NORTHWEST NEW JERSEY HAS BEEN CANCELLED. RAIN HAS ENDED AND NO SIGNIFICANT FLOODING IS EXPECTED. $$
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 24, 4:16 AM EST | High Wind Watch | PHI | Berks, Carbon, Delaware, Lehigh, Monroe, Northampton and 1 more | 11 hr |
| Feb 24, 3:07 PM EST | High Wind Warning | PHI | Berks, Carbon, Delaware, Lehigh, Monroe, Northampton and 1 more | 29 hr |
| Feb 23, 8:55 PM EST | Gale Watch | PHI | 19 hr | |
| Feb 24, 3:37 PM EST | Gale Warning | PHI | 36 hr | |
| Feb 24, 3:37 PM EST | Storm Watch | PHI | 19 hr |
Nearby
Flood Watches in Pennsylvania, 2011Flood Watches in New Jersey, 2011Every 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.