Alert archive / Pennsylvania / Flash Flood Watches in 2009
Flash Flood Watch 4, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood watch at Jul 26, 2009, 3:07 AM EDT for 7 counties in Pennsylvania; 7 counties in New Jersey. It took effect at Jul 26, 2009, 12:00 PM EDT. It was in force for 11 hr.
The area
The counties it named.
The facts
- Issued
- Jul 26, 2009, 3:07 AM EDT (07:07 UTC)
- In effect from
- Jul 26, 2009, 12:00 PM EDT
- Expired
- Jul 26, 2009, 11:02 PM EDT
- In force
- 11 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 07:10 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, 7.1 hours before the alert went out and 190 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
- 99 J/kg
- Mixed-layer CIN
- -64 J/kg
- Mixed-layer LCL
- 979 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 139 m²/s²
- 0-3 km storm-relative helicity
- 158 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS61 KPHI 260707 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 307 AM EDT SUN JUL 26 2009 NJZ001-007>010-012-015-PAZ054-055-060>062-067>071-262100- /O.NEW.KPHI.FF.A.0004.090726T1600Z-090727T1000Z/ /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 307 AM EDT SUN JUL 26 2009 ...FLASH FLOOD WATCH IN EFFECT FROM NOON EDT TODAY THROUGH LATE TONIGHT... THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A * FLASH 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 NOON EDT TODAY THROUGH LATE TONIGHT * LOW PRESSURE ALOFT...A SLOWLY ADVANCING COLD FRONT...MOISTURE AND INSTABILITY MAY COMBINE TO GENERATE STRONG THUNDERSTORMS WITH HEAVY DOWNPOURS THAT COULD RESULT IN FLASH FLOODING. LOCALIZED RAINFALL AMOUNTS IN EXCESS OF TWO INCHES ARE POSSIBLE INTO TONIGHT. 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. && $$ MPD
2 follow-up statements
000 WGUS61 KPHI 261840 FFAPHI FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 240 PM EDT SUN JUL 26 2009 NJZ001-007>010-012-015-PAZ054-055-060>062-067>071-271000- /O.CON.KPHI.FF.A.0004.000000T0000Z-090727T1000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET-MIDDLESEX-MERCER-CARBON- MONROE-BERKS-LEHIGH-NORTHAMPTON-CHESTER-MONTGOMERY-BUCKS-DELAWARE- PHILADELPHIA- INCLUDING THE CITIES OF...NEWTON...WASHINGTON...MORRISTOWN... FLEMINGTON...SOMERVILLE...NEW BRUNSWICK...TRENTON...JIM THORPE... STROUDSBURG...READING...ALLENTOWN...BETHLEHEM...EASTON... WEST CHESTER...NORRISTOWN...DOYLESTOWN...MEDIA...PHILADELPHIA 240 PM EDT SUN JUL 26 2009 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TONIGHT... THE FLASH FLOOD WATCH CONTINUES FOR * PORTIONS OF NEW JERSEY AND PENNSYLVANIA...INCLUDING THE FOLLOWING AREAS...IN NEW JERSEY...HUNTERDON...MERCER... MIDDLESEX...MORRIS...SOMERSET...SUSSEX AND WARREN. IN PENNSYLVANIA...BERKS...BUCKS...CARBON...CHESTER...DELAWARE... LEHIGH...MONROE...MONTGOMERY...NORTHAMPTON AND PHILADELPHIA. * THROUGH LATE TONIGHT. * AN ABUNDANCE OF MOISTURE SURGING NORTHWARD AHEAD OF A FRONTAL BOUNDARY WILL COMBINE WITH AMPLE INSTABILITY TO PRODUCE SHOWERS AND THUNDERSTORMS THROUGH THIS EVENING. LOCALLY VERY HEAVY RAINFALL IS QUITE POSSIBLE WITH SOME OF THE ACTIVITY, WHICH COULD RESULT IN AREAS OF FLASH FLOODING. LOCALIZED RAINFALL AMOUNTS IN EXCESS OF TWO INCHES ARE POSSIBLE. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ GORSE/MEOLA
000 WGUS61 KPHI 270302 FFAPHI FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1102 PM EDT SUN JUL 26 2009 NJZ001-007>010-012-015-PAZ054-055-060>062-067>071-270415- /O.CAN.KPHI.FF.A.0004.000000T0000Z-090727T1000Z/ /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 1102 PM EDT SUN JUL 26 2009 ...FLASH FLOOD WATCH IS CANCELLED... ALTHOUGH THERE MAY BE SCATTERED THUNDERSTORMS OVERNIGHT...ANY RESULTING FLOODING SHOULD BE MINOR. THEREFORE...THE FLASH FLOOD WATCH FOR PORTIONS OF NEW JERSEY AND PENNSYLVANIA HAS BEEN CANCELLED. $$ MPD
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 26, 4:06 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Lehigh, Northampton | 54 min |
| Jul 26, 7:05 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 70 min |
| Jul 25, 11:08 PM EDT | Flash Flood Warning | PHI | Sussex, Warren | 2 hr |
| Jul 26, 12:15 AM EDT | Flash Flood Warning | PHI | Sussex | 90 min |
| Jul 26, 3:26 AM EDT | Small Craft Advisory | PHI | 30 hr | |
| Jul 26, 3:29 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth | 61 min |
| Jul 26, 3:30 PM EDT | Special Marine Warning | PHI | 60 min | |
| Jul 26, 4:55 PM EDT | Tornado Warning | PHI | Hunterdon, Middlesex, Morris, Somerset | 55 min |
| Jul 26, 7:07 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Monmouth | 53 min |
| Jul 26, 7:40 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Monmouth, Ocean | 65 min |
Nearby
Flash Flood Watches in Pennsylvania, 2009Flash Flood Watches in New Jersey, 2009Every flash flood watch in 2009
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.