Alert archive / New Jersey / Flash Flood Watches in 2009
Flash Flood Watch 8, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood watch at Aug 9, 2009, 11:57 AM EDT for 4 states. It was in force for 11 hr.
The area
The counties it named.
The facts
- Issued
- Aug 9, 2009, 11:57 AM EDT (15:57 UTC)
- Expired
- Aug 9, 2009, 10:52 PM EDT
- In force
- 11 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Flood severity
- None
All 25 counties
New Castle County, DE, Cecil County, MD, Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cape May County, NJ, Cumberland County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Ocean County, NJ, Salem 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), 60 km from the middle of the area, began a volume at 15:59 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, 4.0 hours before the alert went out and 199 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
- 897 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 60 m²/s²
- 0-3 km storm-relative helicity
- 136 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 091557 FFAPHI URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1157 AM EDT SUN AUG 9 2009 DEZ001-MDZ008-NJZ001-007>010-012>027-PAZ054-055-060>062-067>071- 100600- /O.NEW.KPHI.FF.A.0008.090809T1557Z-090810T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NEW CASTLE-CECIL-SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET- MIDDLESEX-WESTERN MONMOUTH-EASTERN MONMOUTH-MERCER-SALEM- GLOUCESTER-CAMDEN-NORTHWESTERN BURLINGTON-OCEAN-CUMBERLAND- ATLANTIC-CAPE MAY-ATLANTIC COASTAL CAPE MAY-COASTAL ATLANTIC- COASTAL OCEAN-SOUTHEASTERN BURLINGTON-CARBON-MONROE-BERKS-LEHIGH- NORTHAMPTON-CHESTER-MONTGOMERY-BUCKS-DELAWARE-PHILADELPHIA- INCLUDING THE CITIES OF...WILMINGTON...ELKTON...NEWTON... WASHINGTON...MORRISTOWN...FLEMINGTON...SOMERVILLE... NEW BRUNSWICK...FREEHOLD...SANDY HOOK...TRENTON...PENNSVILLE... GLASSBORO...CAMDEN...CHERRY HILL...MOORESTOWN...MOUNT HOLLY... JACKSON...MILLVILLE...HAMMONTON...CAPE MAY COURT HOUSE... OCEAN CITY...ATLANTIC CITY...LONG BEACH ISLAND... WHARTON STATE FOREST...JIM THORPE...STROUDSBURG...READING... ALLENTOWN...BETHLEHEM...EASTON...WEST CHESTER...NORRISTOWN... DOYLESTOWN...MEDIA...PHILADELPHIA 1157 AM EDT SUN AUG 9 2009 ...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT... THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY HAS ISSUED A * FLASH FLOOD WATCH FOR PORTIONS OF NORTHERN DELAWARE... NORTHEAST MARYLAND...NEW JERSEY AND PENNSYLVANIA...INCLUDING THE FOLLOWING AREAS...IN NORTHERN DELAWARE...NEW CASTLE. IN NORTHEAST MARYLAND...CECIL. IN NEW JERSEY...ATLANTIC... ATLANTIC COASTAL CAPE MAY...CAMDEN...CAPE MAY...COASTAL ATLANTIC...COASTAL OCEAN...CUMBERLAND...EASTERN MONMOUTH... GLOUCESTER...HUNTERDON...MERCER...MIDDLESEX...MORRIS... NORTHWESTERN BURLINGTON...OCEAN...SALEM...SOMERSET... SOUTHEASTERN BURLINGTON...SUSSEX...WARREN AND WESTERN MONMOUTH. IN PENNSYLVANIA...BERKS...BUCKS...CARBON...CHESTER... DELAWARE...LEHIGH...MONROE...MONTGOMERY...NORTHAMPTON AND PHILADELPHIA. * THROUGH LATE TONIGHT * A VERY MOIST AND UNSTABLE AIRMASS COVERS THE REGION. THIS COMBINED WITH A WARM FRONT MOVING NORTH ALONG WITH CONTINUED UPPER AIR DISTURBANCES MOVING THROUGH WILL ALLOW SCATTERED SHOWERS AND THUNDERSTORMS TO KEEP DEVELOPING THROUGH TONIGHT. ANY OF THE SHOWERS AND THUNDERSTORMS COULD CONTAIN TORRENTIAL DOWNPOURS WITH POTENTIAL RAINFALL RATES OF 2 INCHES AN HOUR. * WHERE EVER TORRENTIAL DOWNPOURS DEVELOP, FLASH FLOODING COULD ALSO DEVELOP QUICKLY. SMALL STREAMS AND POOR DRAINAGE AREAS WILL BE THE MOST SUSCEPTIBLE FOR FLOODING. 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. && $$ RNS
1 follow-up statement
000 WGUS61 KPHI 100252 FFAPHI FLOOD WATCH NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1052 PM EDT SUN AUG 9 2009 DEZ001-MDZ008-NJZ001-007>010-012>027-PAZ054-055-060>062-067>071- 100400- /O.CAN.KPHI.FF.A.0008.000000T0000Z-090810T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NEW CASTLE-CECIL-SUSSEX-WARREN-MORRIS-HUNTERDON-SOMERSET- MIDDLESEX-WESTERN MONMOUTH-EASTERN MONMOUTH-MERCER-SALEM- GLOUCESTER-CAMDEN-NORTHWESTERN BURLINGTON-OCEAN-CUMBERLAND- ATLANTIC-CAPE MAY-ATLANTIC COASTAL CAPE MAY-COASTAL ATLANTIC- COASTAL OCEAN-SOUTHEASTERN BURLINGTON-CARBON-MONROE-BERKS-LEHIGH- NORTHAMPTON-CHESTER-MONTGOMERY-BUCKS-DELAWARE-PHILADELPHIA- INCLUDING THE CITIES OF...WILMINGTON...ELKTON...NEWTON... WASHINGTON...MORRISTOWN...FLEMINGTON...SOMERVILLE... NEW BRUNSWICK...FREEHOLD...SANDY HOOK...TRENTON...PENNSVILLE... GLASSBORO...CAMDEN...CHERRY HILL...MOORESTOWN...MOUNT HOLLY... JACKSON...MILLVILLE...HAMMONTON...CAPE MAY COURT HOUSE... OCEAN CITY...ATLANTIC CITY...LONG BEACH ISLAND... WHARTON STATE FOREST...JIM THORPE...STROUDSBURG...READING... ALLENTOWN...BETHLEHEM...EASTON...WEST CHESTER...NORRISTOWN... DOYLESTOWN...MEDIA...PHILADELPHIA 1052 PM EDT SUN AUG 9 2009 ...FLASH FLOOD WATCH IS CANCELLED... THE FLASH FLOOD WATCH FOR PORTIONS OF NORTHERN DELAWARE... NORTHEAST MARYLAND...NEW JERSEY AND PENNSYLVANIA HAS BEEN CANCELLED. WHILE SOME HEAVY RAIN IS POSSIBLE OVERNIGHT, IT SHOULD FALL OVER AREAS IN NORTHERN NEW JERSEY THAT DID NOT HAVE HEAVY RAIN EARLIER TODAY. $$ TFG
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 9:23 AM EDT | Areal Flood Advisory | PHI | Camden, Gloucester | 83 min |
| Aug 9, 10:33 AM EDT | Areal Flood Advisory | PHI | Atlantic, Burlington, Ocean | 69 min |
| Aug 9, 1:56 PM EDT | Excessive Heat Warning | PHI | Burlington, Camden, Gloucester, Mercer | 30 hr |
| Aug 9, 1:56 PM EDT | Heat Advisory | PHI | Atlantic, Burlington, Cape May, Cumberland, Hunterdon, Middlesex and 6 more | 30 hr |
| Aug 9, 6:10 PM EDT | Severe Thunderstorm Warning | PHI | Camden, Gloucester, Salem | 80 min |
| Aug 9, 6:20 PM EDT | Special Marine Warning | PHI | 115 min | |
| Aug 9, 6:48 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Camden, Cumberland, Gloucester, Salem | 72 min |
| Aug 9, 7:21 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Cape May, Cumberland, Ocean | 69 min |
| Aug 9, 7:33 PM EDT | Special Marine Warning | PHI | 87 min | |
| Aug 9, 9:33 AM EDT | Areal Flood Warning | PHI | Philadelphia | 51 min |
| Aug 9, 4:30 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 90 min |
| Aug 9, 5:17 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Montgomery | 76 min |
| Aug 9, 5:53 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 82 min |
| Aug 9, 6:03 PM EDT | Areal Flood Advisory | PHI | Berks, Chester, Delaware, Montgomery, Philadelphia | 117 min |
| Aug 9, 7:36 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 69 min |
Nearby
Flash Flood Watches in New Jersey, 2009Flash Flood Watches in Pennsylvania, 2009Flash Flood Watches in Maryland, 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.