Alert archive / New Jersey / Flood Watches in 2009
Flood Watch 3, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flood watch at May 6, 2009, 9:01 PM EDT for Delaware County, Philadelphia County, Pennsylvania; 5 counties in New Jersey; New Castle County, Delaware. It was in force for 19 hr.
The area
The counties it named.
The facts
- Issued
- May 6, 2009, 9:01 PM EDT (01:01 UTC)
- Expired
- May 7, 2009, 3:51 PM EDT
- In force
- 19 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Flood severity
- None
Counties New Castle County, DE, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Somerset County, NJ, Delaware County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 49 km from the middle of the area, began a volume at 01:02 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
Brookhaven, NY (KOKX), launched 00:00Z, 1.0 hours before the alert went out and 185 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
- 760 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 94 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS61 KPHI 070101 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 901 PM EDT WED MAY 6 2009 DEZ001-NJZ009-010-012-013-015-PAZ067>071-071000- /O.NEW.KPHI.FA.A.0003.090507T0101Z-090507T1400Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NEW CASTLE-HUNTERDON-SOMERSET-MIDDLESEX-WESTERN MONMOUTH-MERCER- CHESTER-MONTGOMERY-BUCKS-DELAWARE-PHILADELPHIA- INCLUDING THE CITIES OF...WILMINGTON...FLEMINGTON...SOMERVILLE... NEW BRUNSWICK...FREEHOLD...TRENTON...WEST CHESTER...NORRISTOWN... DOYLESTOWN...MEDIA...PHILADELPHIA 901 PM EDT WED MAY 6 2009 ...FLOOD WATCH IN EFFECT THROUGH THURSDAY MORNING... THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A * FLOOD WATCH FOR PORTIONS OF NORTHERN DELAWARE...NEW JERSEY AND SOUTHEAST PENNSYLVANIA...INCLUDING THE FOLLOWING AREAS...IN NORTHERN DELAWARE...NEW CASTLE. IN NEW JERSEY...HUNTERDON... MERCER...MIDDLESEX...SOMERSET AND WESTERN MONMOUTH. IN SOUTHEAST PENNSYLVANIA...BUCKS...CHESTER...DELAWARE... MONTGOMERY AND PHILADELPHIA. * THROUGH THURSDAY MORNING * TWO BANDS OF THUNDERSTORMS WITH HEAVY RAIN ARE EXPECTED TO AFFECT THE REGION. ONE WILL MOVE THROUGH LATER THIS EVENING WITH A SECOND BAND EXPECTED AROUND MORNING. THE FLOOD WATCH AREA HAS HAD THE HEAVIEST OF THE RAINS SO FAR THIS MONTH AND ARE THE MOST VULNERABLE TO FLOODING. IN SOME LOCATIONS OF LOWER BUCKS AND MONTGOMERY COUNTIES AS WELL AS NORTHERN MIDDLESEX COUNTY ONLY ABOUT AN INCH OF RAIN WITHIN SIX HOURS WOULD START FLOODING. VULNERABLE STREAMS INCLUDE AND ARE NOT LIMITED TO THE CHRISTINA RIVER IN NEW CASTLE COUNTY...CHESTER CREEK IN DELAWARE COUNTY... THE PERKIOMEN CREEK IN MONTGOMERY COUNTY...THE NESHAMINY CREEK IN BUCKS COUNTY AND THE ASSUNPINK CREEK IN MERCER COUNTY. 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. && $$ GIGI/OHARA
3 follow-up statements
000 WGUS61 KPHI 070634 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 234 AM EDT THU MAY 7 2009 DEZ001-NJZ009-010-012-013-015-PAZ067>071-071600- /O.EXT.KPHI.FA.A.0003.000000T0000Z-090507T1600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NEW CASTLE-HUNTERDON-SOMERSET-MIDDLESEX-WESTERN MONMOUTH-MERCER- CHESTER-MONTGOMERY-BUCKS-DELAWARE-PHILADELPHIA- INCLUDING THE CITIES OF...WILMINGTON...FLEMINGTON...SOMERVILLE... NEW BRUNSWICK...FREEHOLD...TRENTON...WEST CHESTER...NORRISTOWN... DOYLESTOWN...MEDIA...PHILADELPHIA 234 AM EDT THU MAY 7 2009 ...FLOOD WATCH NOW IN EFFECT UNTIL NOON EDT TODAY... THE FLOOD WATCH IS NOW IN EFFECT FOR * PORTIONS OF NORTHERN DELAWARE...NEW JERSEY AND SOUTHEAST PENNSYLVANIA...INCLUDING THE FOLLOWING AREAS...IN NORTHERN DELAWARE...NEW CASTLE. IN NEW JERSEY...HUNTERDON...MERCER... MIDDLESEX...SOMERSET AND WESTERN MONMOUTH. IN SOUTHEAST PENNSYLVANIA...BUCKS...CHESTER...DELAWARE...MONTGOMERY AND PHILADELPHIA. * UNTIL NOON EDT TODAY * HEAVY RAIN AND SCATTERED THUNDERSTORMS WILL AFFECT THE REGION INTO THIS MORNING. RAINFALL RATES OF AN INCH IN LESS THAN AN HOUR ARE POSSIBLE. VULNERABLE STREAMS INCLUDE AND ARE NOT LIMITED TO THE CHRISTINA RIVER IN NEW CASTLE COUNTY...CHESTER CREEK IN DELAWARE COUNTY... THE PERKIOMEN CREEK IN MONTGOMERY COUNTY...THE NESHAMINY CREEK IN BUCKS COUNTY AND THE ASSUNPINK CREEK IN MERCER COUNTY. * EARLY MORNING COMMUTERS WILL PROBABLY SEE DELAYS DUE TO FLOODING IN POOR DRAINAGE AREAS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLOOD WATCH MEANS THERE IS A POTENTIAL FOR FLOODING BASED ON CURRENT FORECASTS. YOU SHOULD MONITOR LATER FORECASTS AND BE ALERT FOR POSSIBLE FLOOD WARNINGS. THOSE LIVING IN AREAS PRONE TO FLOODING SHOULD BE PREPARED TO TAKE ACTION SHOULD FLOODING DEVELOP. && $$ RNS
000 WGUS61 KPHI 071530 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1130 AM EDT THU MAY 7 2009 DEZ001-NJZ009-010-012-013-015-PAZ067>071-072100- /O.EXT.KPHI.FA.A.0003.000000T0000Z-090507T2100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NEW CASTLE-HUNTERDON-SOMERSET-MIDDLESEX-WESTERN MONMOUTH-MERCER- CHESTER-MONTGOMERY-BUCKS-DELAWARE-PHILADELPHIA- INCLUDING THE CITIES OF...WILMINGTON...FLEMINGTON...SOMERVILLE... NEW BRUNSWICK...FREEHOLD...TRENTON...WEST CHESTER...NORRISTOWN... DOYLESTOWN...MEDIA...PHILADELPHIA 1130 AM EDT THU MAY 7 2009 ...FLOOD WATCH NOW IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON... THE FLOOD WATCH IS NOW IN EFFECT FOR * PORTIONS OF NORTHERN DELAWARE...NEW JERSEY AND SOUTHEAST PENNSYLVANIA...INCLUDING THE FOLLOWING AREAS...IN NORTHERN DELAWARE...NEW CASTLE. IN NEW JERSEY...HUNTERDON...MERCER... MIDDLESEX...SOMERSET AND WESTERN MONMOUTH. IN SOUTHEAST PENNSYLVANIA...BUCKS...CHESTER...DELAWARE...MONTGOMERY AND PHILADELPHIA. * UNTIL 5 PM EDT THIS AFTERNOON * ANOTHER ROUND OF SHOWERS IS EXPECTED TO MOVE THROUGH THE DELAWARE VALLEY AND INTERSTATE 95 CORRIDOR THIS AFTERNOON. THIS IS THE NINTH DAY IN A ROW THAT THE REGION HAS EXPERIENCED RAINFALL. WHILE MAIN STEM RIVERS STILL HAVE ROOM TO HANDLE RUNOFF, MANY SMALLER CREEKS AND STREAMS ARE RUNNING HIGH. THERE ARE STILL ABOUT A HALF-DOZEN TRIBUTARIES ABOVE CAUTION STAGE FROM LAST NIGHTS RAINFALL. * MOST AREAS WILL ONLY SEE A FEW HUNDREDTHS TO A TENTH OR TWO OF NEW RAINFALL, BUT RADAR AND LIGHTNING DETECTION SYSTEMS INDICATE THAT THE APPROACHING ACTIVITY DOES IN FACT HAVE A CONVECTIVE CONTRIBUTION. THEREFORE ISOLATED HEAVIER RAINFALL CANNOT BE RULED OUT. BECAUSE CREEKS AND STREAMS ARE ALREADY RUNNING HIGH, FLOOD GUIDANCE INDICATES THAT LESS THAN ONE-HALF OF AN INCH OF RAINFALL IN AN HOUR COULD SEND WATER OVER SOME BANKS. AS A RESULT, THE FLOOD WATCH HAS BEEN EXTENDED THROUGH 500 PM. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLOOD WATCH MEANS THERE IS A POTENTIAL FOR FLOODING BASED ON CURRENT FORECASTS. 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. && $$ KRUZDLO/GORSE
000 WGUS61 KPHI 071951 FFAPHI FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 351 PM EDT THU MAY 7 2009 DEZ001-NJZ009-010-012-013-015-PAZ067>071-072100- /O.CAN.KPHI.FA.A.0003.000000T0000Z-090507T2100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NEW CASTLE-HUNTERDON-SOMERSET-MIDDLESEX-WESTERN MONMOUTH-MERCER- CHESTER-MONTGOMERY-BUCKS-DELAWARE-PHILADELPHIA- INCLUDING THE CITIES OF...WILMINGTON...FLEMINGTON...SOMERVILLE... NEW BRUNSWICK...FREEHOLD...TRENTON...WEST CHESTER...NORRISTOWN... DOYLESTOWN...MEDIA...PHILADELPHIA 351 PM EDT THU MAY 7 2009 ...FLOOD WATCH IS CANCELLED... THE FLOOD WATCH FOR PORTIONS OF NORTHERN DELAWARE, NEW JERSEY AND SOUTHEAST PENNSYLVANIA HAS BEEN CANCELLED. THE THREAT FOR WIDESPREAD FLOODING HAS ENDED AS THE MORE ORGANIZED SHOWERS AND THUNDERSTORMS MOVE TO THE EAST. AS A RESULT, THE FLOOD WATCH HAS BEEN CANCELLED. $$ GORSE
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 7, 1:08 AM EDT | Flash Flood Warning | PHI | Chester, Montgomery | 6 hr |
| May 7, 1:43 AM EDT | Flash Flood Warning | PHI | Bucks | 5 hr |
| May 7, 1:51 AM EDT | Flash Flood Warning | PHI | Delaware, Philadelphia | 5 hr |
| May 7, 10:15 AM EDT | Areal Flood Warning | PHI | Montgomery | 3 hr |
| May 7, 1:42 PM EDT | Areal Flood Advisory | PHI | Bucks, Montgomery | 4 hr |
| May 7, 2:34 PM EDT | Areal Flood Advisory | PHI | Bucks, Delaware, Montgomery, Philadelphia | 3 hr |
| May 7, 3:09 AM EDT | Areal Flood Advisory | PHI | Hunterdon, Morris | 2 hr |
| May 7, 1:22 PM EDT | Areal Flood Advisory | PHI | Burlington, Camden, Gloucester, Salem | 4 hr |
| May 7, 1:43 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer, Middlesex, Somerset | 62 min |
| May 7, 2:01 PM EDT | Special Marine Warning | PHI | 89 min | |
| May 7, 2:05 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Camden, Cumberland, Gloucester, Salem | 40 min |
| May 7, 2:53 PM EDT | Special Marine Warning | PHI | 97 min | |
| May 7, 4:05 PM EDT | Special Marine Warning | PHI | 67 min | |
| May 7, 2:00 AM EDT | River Flood Warning | PHI | New Castle | 3 hr |
| May 7, 1:33 PM EDT | Severe Thunderstorm Warning | PHI | Kent, New Castle | 66 min |
Nearby
Flood Watches in New Jersey, 2009Flood Watches in Pennsylvania, 2009Flood Watches in Delaware, 2009Every 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.