Alert archive / Pennsylvania / Flash Flood Watches in 2015
Flash Flood Watch 1, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood watch at May 31, 2015, 1:11 PM EDT for 6 counties in Pennsylvania; 6 counties in New Jersey. It was in force for 13 hr.
The area
The counties it named.
The facts
- Issued
- May 31, 2015, 1:11 PM EDT (17:11 UTC)
- Expired
- Jun 1, 2015, 2:00 AM EDT
- In force
- 13 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Flood severity
- None
Counties Hunterdon 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, Lehigh County, PA, Monroe County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 103 km from the middle of the area, began a volume at 17:12 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, 5.2 hours before the alert went out and 189 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
- 106 J/kg
- Mixed-layer CIN
- -105 J/kg
- Mixed-layer LCL
- 746 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 41 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.
499 WGUS61 KPHI 311711 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 111 PM EDT SUN MAY 31 2015 NJZ001-007-008-PAZ054-055-062-010300- /O.NEW.KPHI.FF.A.0001.150531T1711Z-150601T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SUSSEX-WARREN-MORRIS-CARBON-MONROE-NORTHAMPTON- INCLUDING THE CITIES OF...NEWTON...WASHINGTON...MORRISTOWN... JIM THORPE...STROUDSBURG...BETHLEHEM...EASTON 111 PM EDT SUN MAY 31 2015 ...FLASH FLOOD WATCH IN EFFECT UNTIL 11 PM EDT THIS EVENING... THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A * FLASH FLOOD WATCH FOR PORTIONS OF NORTHERN NEW JERSEY AND PENNSYLVANIA...INCLUDING THE FOLLOWING AREAS...IN NORTHERN NEW JERSEY...MORRIS...SUSSEX AND WARREN. IN PENNSYLVANIA... CARBON...MONROE AND NORTHAMPTON. * UNTIL 11 PM EDT THIS EVENING * LOCATIONS...A PORTION OF NORTHEAST PENNSYLVANIA INCLUDING THE POCONOS AS WELL AS FAR NORTHWEST NEW JERSEY. * BANDS OF THUNDERSTORMS ARE EXPECTED TO PRODUCE SWATHS OF EXCESSIVE SHORT DURATION RAINFALL, POSSIBLY AS MUCH AS 2 INCHES IN AN HOUR. IF THESE TORRENTIAL RAINS OCCUR, POCKETS OF DANGEROUS STREET AND HIGHWAY FLOODING WOULD RESULT SOMETIME THIS AFTERNOON OR EVENING. 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. && $$ GORSE/DRAG
4 follow-up statements
063 WGUS61 KPHI 311932 FFAPHI FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 332 PM EDT SUN MAY 31 2015 NJZ001-007-008-PAZ054-055-062-010300- /O.CON.KPHI.FF.A.0001.000000T0000Z-150601T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SUSSEX-WARREN-MORRIS-CARBON-MONROE-NORTHAMPTON- INCLUDING THE CITIES OF...NEWTON...WASHINGTON...MORRISTOWN... JIM THORPE...STROUDSBURG...BETHLEHEM...EASTON 332 PM EDT SUN MAY 31 2015 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 11 PM EDT THIS EVENING... THE FLASH FLOOD WATCH CONTINUES FOR * PORTIONS OF NORTHWESTERN NEW JERSEY AND NORTHEAST PENNSYLVANIA... INCLUDING THE FOLLOWING AREAS...IN NORTHWESTERN NEW JERSEY... MORRIS...SUSSEX AND WARREN. IN NORTHEAST PENNSYLVANIA... CARBON...MONROE AND NORTHAMPTON. * UNTIL 11 PM EDT THIS EVENING * CONDITIONS ARE FAVORABLE FOR THE DEVELOPMENT OF WIDESPREAD HEAVY RAINS FROM BANDS OF THUNDERSTORMS IN THE WATCH AREA ALONG AND NORTH OF ROUTE 80 LATE THIS AFTERNOON AND EVENING. THESE THUNDERSTORMS MAY PRODUCE NARROW SWATHS OF EXCESSIVE SHORT DURATION RAINFALL... POSSIBLY AS MUCH AS 2 INCHES IN AN HOUR WITH ISOLATED STORM TOTALS NEAR 4 INCHES. IF THESE TORRENTIAL RAINS OCCUR... POCKETS OF DANGEROUS STREET AND HIGHWAY FLOODING WOULD RESULT SOMETIME VERY LATE THIS AFTERNOON OR MORE LIKELY EARLY THIS EVENING. * THERE WAS A REPORT EARLIER THIS AFTERNOON OF 1.5 INCHES OF RAIN IN 45 MINUTES FROM FORKS TOWNSHIP IN NORTHAMPTON COUNTY PENNSYLVANIA. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO A RAPID RISE OF WATER TO DANGEROUS LEVELS. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$
855 WGUS61 KPHI 312207 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 607 PM EDT SUN MAY 31 2015 NJZ009-010-012-PAZ060-061-105-010600- /O.EXB.KPHI.FF.A.0001.000000T0000Z-150601T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ HUNTERDON-SOMERSET-MIDDLESEX-BERKS-LEHIGH-UPPER BUCKS- INCLUDING THE CITIES OF...FLEMINGTON...SOMERVILLE... NEW BRUNSWICK...READING...ALLENTOWN...CHALFONT...PERKASIE 607 PM EDT SUN MAY 31 2015 ...FLASH FLOOD WATCH IN EFFECT UNTIL 2 AM EDT MONDAY... THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS EXPANDED THE * FLASH FLOOD WATCH TO INCLUDE PORTIONS OF NEW JERSEY AND PENNSYLVANIA...INCLUDING THE FOLLOWING AREAS...IN NEW JERSEY... HUNTERDON...MIDDLESEX AND SOMERSET. IN PENNSYLVANIA...BERKS... LEHIGH AND UPPER BUCKS. * UNTIL 2 AM EDT MONDAY * CONDITIONS ARE FAVORABLE FOR THE DEVELOPMENT OF AREAS OF HEAVY RAINS FROM BANDS OF THUNDERSTORMS IN THE WATCH AREA. THESE THUNDERSTORMS MAY PRODUCE NARROW SWATHS OF EXCESSIVE SHORT DURATION RAINFALL... POSSIBLY AS MUCH AS 2 INCHES IN AN HOUR WITH ISOLATED STORM TOTALS NEAR 4 INCHES. IF THESE TORRENTIAL RAINS OCCUR... POCKETS OF DANGEROUS STREET AND HIGHWAY FLOODING WOULD RESULT SOMETIME EARLY TONIGHT. 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. && $$ NJZ001-007-008-PAZ054-055-062-010600- /O.EXT.KPHI.FF.A.0001.000000T0000Z-150601T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SUSSEX-WARREN-MORRIS-CARBON-MONROE-NORTHAMPTON- INCLUDING THE CITIES OF...NEWTON...WASHINGTON...MORRISTOWN... JIM THORPE...STROUDSBURG...BETHLEHEM...EASTON 607 PM EDT SUN MAY 31 2015 ...FLASH FLOOD WATCH NOW IN EFFECT UNTIL 2 AM EDT MONDAY... THE FLASH FLOOD WATCH IS NOW IN EFFECT FOR * PORTIONS OF NORTHERN NEW JERSEY AND PENNSYLVANIA...INCLUDING THE FOLLOWING AREAS...IN NORTHERN NEW JERSEY...MORRIS...SUSSEX AND WARREN. IN PENNSYLVANIA...CARBON...MONROE AND NORTHAMPTON. * UNTIL 2 AM EDT MONDAY * CONDITIONS CONTINUE FAVORABLE FOR THE DEVELOPMENT OF WIDESPREAD HEAVY RAINS FROM BANDS OF THUNDERSTORMS IN THE WATCH AREA THIS EVENING. THESE THUNDERSTORMS MAY PRODUCE NARROW SWATHS OF EXCESSIVE SHORT DURATION RAINFALL... POSSIBLY AS MUCH AS 2 INCHES IN AN HOUR WITH ISOLATED STORM TOTALS NEAR 4 INCHES. IF THESE TORRENTIAL RAINS OCCUR... POCKETS OF DANGEROUS STREET AND HIGHWAY FLOODING WOULD RESULT SOMETIME EARLY TONIGHT. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO A RAPID RISE OF WATER TO DANGEROUS LEVELS. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ DRAG
420 WGUS61 KPHI 010105 FFAPHI FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 905 PM EDT SUN MAY 31 2015 NJZ001-007>010-012-PAZ054-055-060>062-105-010600- /O.CON.KPHI.FF.A.0001.000000T0000Z-150601T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-CARBON-MONROE- BERKS-LEHIGH-NORTHAMPTON-UPPER BUCKS- INCLUDING THE CITIES OF...NEWTON...WASHINGTON...MORRISTOWN... FLEMINGTON...SOMERVILLE...NEW BRUNSWICK...JIM THORPE... STROUDSBURG...READING...ALLENTOWN...BETHLEHEM...EASTON... CHALFONT...PERKASIE 905 PM EDT SUN MAY 31 2015 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 2 AM EDT MONDAY... THE FLASH FLOOD WATCH CONTINUES FOR * PORTIONS OF NEW JERSEY AND PENNSYLVANIA...INCLUDING THE FOLLOWING AREAS...IN NEW JERSEY...HUNTERDON...MIDDLESEX... MORRIS...SOMERSET...SUSSEX AND WARREN. IN PENNSYLVANIA... BERKS...CARBON...LEHIGH...MONROE...NORTHAMPTON AND UPPER BUCKS. * UNTIL 2 AM EDT MONDAY * WIDESPREAD SHOWERS AND EMBEDDED THUNDERSTORMS COVER MUCH OF THE WATCH AREA THIS EVENING. THERE COULD STILL BE POCKETS OF FLASH FLOODING LATER THIS EVENING. THUNDERSTORMS SHOULD DECREASE IN COVERAGE AFTER 2 AM. * SO FAR, ABOUT 5 INCHES OF RAIN HAS FALLEN IN NORTHEAST MIDDLESEX COUNTY WHERE ANOTHER BATCH OF HEAVY SHOWERS SHOULD OCCUR IN MIDDLESEX COUNTY TOWARD MIDNIGHT. * ELSEWHERE, AS OF 9 PM WE KNOW OF 1.5 TO 2 INCH AMOUNTS IN PARTS OF MONROE AND CARBON COUNTIES IN THE POCONOS AND UNDOUBTEDLY HEAVIER AMOUNTS FELL THERE...POSSIBLY ISOLATED REPORTS NEAR 5 INCHES, ESPECIALLY IN SOUTHERN CARBON COUNTY. 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. && $$
779 WGUS61 KPHI 010553 FFAPHI FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 153 AM EDT MON JUN 1 2015 NJZ001-007>010-012-PAZ054-055-060>062-105-010700- /O.EXP.KPHI.FF.A.0001.000000T0000Z-150601T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-CARBON-MONROE- BERKS-LEHIGH-NORTHAMPTON-UPPER BUCKS- INCLUDING THE CITIES OF...NEWTON...WASHINGTON...MORRISTOWN... FLEMINGTON...SOMERVILLE...NEW BRUNSWICK...JIM THORPE... STROUDSBURG...READING...ALLENTOWN...BETHLEHEM...EASTON... CHALFONT...PERKASIE 153 AM EDT MON JUN 1 2015 ...FLASH FLOOD WATCH WILL EXPIRE AT 2 AM EDT EARLY THIS MORNING... THE FLASH FLOOD WATCH FOR PORTIONS OF NEW JERSEY AND PENNSYLVANIA WILL EXPIRE AT 2 AM EDT EARLY THIS MORNING. WHILE RAIN WILL CONTINUE THROUGH THE OVERNIGHT HOURS, THE HEAVIEST RAIN HAS ENDED. RAINFALL WILL BE STEADY, BUT LIGHTER. THE NEED FOR ADDITIONAL WATCHES IS BEING EVALUATED AT THIS TIME. $$
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 30, 8:19 PM EDT | Special Weather Statement | PHI | Carbon | 56 min |
| May 30, 8:46 PM EDT | Special Weather Statement | PHI | Lebanon | 29 min |
| May 30, 9:03 PM EDT | Areal Flood Advisory | PHI | Berks | 3 hr |
| May 30, 9:11 PM EDT | Special Weather Statement | PHI | Lebanon | 64 min |
| May 30, 9:20 PM EDT | Special Weather Statement | PHI | Carbon | 55 min |
| May 30, 9:36 PM EDT | Areal Flood Advisory | PHI | Carbon | 3 hr |
| May 31, 1:00 PM EDT | Severe Thunderstorm Warning | PHI | Northampton | 45 min |
| May 31, 4:33 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 42 min |
| May 31, 5:12 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 63 min |
| May 31, 5:23 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 37 min |
| May 31, 5:42 PM EDT | Flash Flood Warning | PHI | Carbon, Monroe | 6 hr |
| May 31, 7:08 PM EDT | Special Weather Statement | PHI | Lehigh | 82 min |
| May 31, 7:27 PM EDT | Areal Flood Advisory | PHI | Berks, Lehigh | 5 hr |
| May 31, 7:46 PM EDT | Flash Flood Warning | PHI | Berks, Lehigh | 4 hr |
| May 31, 7:48 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 35 min |
| May 31, 7:57 PM EDT | Areal Flood Advisory | PHI | Lehigh, Northampton | 6 hr |
| May 31, 1:24 PM EDT | Special Weather Statement | PHI | Monmouth | 36 min |
| May 31, 2:00 PM EDT | Special Weather Statement | PHI | Monmouth | 45 min |
| May 31, 5:57 PM EDT | Small Craft Advisory | PHI | 6 hr | |
| May 31, 6:11 PM EDT | Areal Flood Advisory | PHI | Middlesex, Somerset | 3 hr |
| May 31, 6:37 PM EDT | Flash Flood Warning | PHI | Middlesex | 5 hr |
| May 31, 6:50 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Monmouth | 40 min |
Nearby
Flash Flood Watches in Pennsylvania, 2015Flash Flood Watches in New Jersey, 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.