Alert archive / Pennsylvania / Flash Flood Warnings in 2020
Flash Flood Warning 48, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 7, 2020, 5:43 PM EDT for Montgomery County, Philadelphia County, Pennsylvania; Camden County, Gloucester County, New Jersey. It was in force for 4 hr. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 7, 2020, 5:43 PM EDT (21:43 UTC)
- Expired
- Aug 7, 2020, 9:51 PM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Camden County, NJ, Gloucester County, NJ, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 71 km from the middle of the area, began a volume at 21:47 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 7, 7:00 PM EDT | FLASH FLOOD | Logan Twp., NJ | CARS STUCK IN FLOODED WATER, KNEE HIGH DEEP WATER IN SOME AREAS. TIME ESTIMATED RADAR. |
| Aug 7, 7:15 PM EDT | FLASH FLOOD | Woolwich Twp, NJ | WIDESPREAD FLASH FLOODING OF ROADS AND PROPERTIES REPORTED IN SWEDESBORO. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 9.7 hours before the alert went out and 215 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
- 301 J/kg
- Mixed-layer CIN
- -67 J/kg
- Mixed-layer LCL
- 665 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- -37 m²/s²
- 0-3 km storm-relative helicity
- 18 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
123
WGUS51 KPHI 072143
FFWPHI
NJC007-015-PAC091-101-080345-
/O.NEW.KPHI.FF.W.0048.200807T2143Z-200808T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
543 PM EDT Fri Aug 7 2020
The National Weather Service in Mount Holly NJ has issued a
* Flash Flood Warning for...
Northwestern Camden County in southern New Jersey...
Northwestern Gloucester County in southern New Jersey...
Southern Montgomery County in southeastern Pennsylvania...
Philadelphia County in southeastern Pennsylvania...
* Until 1145 PM EDT Friday.
* At 542 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain moving into the warned area. Flash flooding is expected
to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar indicated.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other
poor drainage and low lying areas.
* Some locations that could experience flooding include...
Philadelphia, Camden, Wilmington, Gloucester City, Cherry Hill,
Norristown, Chester, Deptford, West Deptford, Phoenixville, West
Norriton, East Norriton, Bellmawr, Yeadon, Woodbury, Pitman,
Carneys Point, Conshohocken, Palmyra and Hatboro.
Additional rainfall amounts of 1 to 3 inches are possible in the
warned area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets, and underpasses
as well as other poor drainage areas and low lying spots.
&&
LAT...LON 4022 7515 4012 7496 4005 7498 3999 7506
3998 7501 3995 7502 3991 7495 3969 7519
3969 7533 3976 7540 3978 7540 3970 7551
3972 7551 3984 7536 3987 7521 3988 7526
3996 7525 4007 7536 4010 7546 4019 7555
FLASH FLOOD...RADAR INDICATED
$$
Iovino2 follow-up statements
878
WGUS71 KPHI 080014
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
814 PM EDT Fri Aug 7 2020
NJC007-PAC091-101-080022-
/O.CAN.KPHI.FF.W.0048.000000T0000Z-200808T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Camden NJ-Montgomery PA-Philadelphia PA-
814 PM EDT Fri Aug 7 2020
...THE FLASH FLOOD WARNING FOR NORTHWESTERN CAMDEN...SOUTHERN
MONTGOMERY AND PHILADELPHIA COUNTIES IS CANCELLED...
Flooding is no longer expected to pose a threat. Please continue to
heed any remaining road closures.
LAT...LON 3984 7536 3985 7525 3989 7514 3984 7509
3980 7507 3969 7519 3969 7533 3976 7540
3974 7546 3972 7551
$$
NJC015-080345-
/O.CON.KPHI.FF.W.0048.000000T0000Z-200808T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gloucester NJ-
814 PM EDT Fri Aug 7 2020
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1145 PM EDT FRIDAY
FOR NORTHWESTERN GLOUCESTER COUNTY...
At 812 PM EDT, runoff from today's heavy rain was continuing to
produce flooding in parts of Gloucester Coounty.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar indicated.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other
poor drainage and low lying areas.
Some locations that will conitnue to experience flooding include...
Deptford, West Deptford, Bellmawr, Woodbury, Pitman, Paulsboro,
Westville, Woodbury Heights, National Park, Swedesboro, Mullica
Hill, Gibbstown and Wenonah.
Little additional rainfall is expected.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets, and underpasses
as well as other poor drainage areas and low lying spots.
&&
LAT...LON 3984 7536 3985 7525 3989 7514 3984 7509
3980 7507 3969 7519 3969 7533 3976 7540
3974 7546 3972 7551
FLASH FLOOD...RADAR INDICATED
$$
Iovino717
WGUS71 KPHI 080151 RRA
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
951 PM EDT Fri Aug 7 2020
NJC015-080201-
/O.CAN.KPHI.FF.W.0048.000000T0000Z-200808T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gloucester NJ-
951 PM EDT Fri Aug 7 2020
...THE FLASH FLOOD WARNING FOR NORTHWESTERN GLOUCESTER COUNTY IS
CANCELLED...
Flood waters have receded. Flooding is no longer expected to pose a
threat. Please continue to heed any remaining road closures.
LAT...LON 3984 7536 3985 7525 3989 7514 3984 7509
3980 7507 3969 7519 3969 7533 3976 7540
3974 7546 3972 7551
$$
IovinoThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 6:49 AM EDT | Areal Flood Advisory | PHI | Berks | 4 hr |
| Aug 7, 9:22 AM EDT | Areal Flood Advisory | PHI | Bucks | 3 hr |
| Aug 7, 10:34 AM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh | 56 min |
| Aug 7, 11:28 AM EDT | Special Weather Statement | PHI | Carbon, Lehigh | 47 min |
| Aug 7, 2:34 PM EDT | Areal Flood Advisory | PHI | Berks | 4 hr |
| Aug 7, 3:46 PM EDT | Areal Flood Advisory | PHI | Carbon, Lehigh, Northampton | 4 hr |
| Aug 7, 4:10 PM EDT | Flash Flood Warning | PHI | Berks | 2 hr |
| Aug 7, 4:20 PM EDT | Areal Flood Advisory | PHI | Chester, Montgomery | 4 hr |
| Aug 7, 4:32 PM EDT | Flash Flood Warning | PHI | Chester | 3 hr |
| Aug 7, 4:47 PM EDT | Special Weather Statement | PHI | Chester | 28 min |
| Aug 7, 5:00 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 60 min |
| Aug 7, 5:03 PM EDT | Flash Flood Warning | PHI | Chester, Delaware | 5 hr |
| Aug 7, 5:15 PM EDT | Areal Flood Advisory | PHI | Bucks | 3 hr |
| Aug 7, 5:25 PM EDT | Areal Flood Advisory | PHI | Bucks, Montgomery, Philadelphia | 3 hr |
| Aug 7, 5:38 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 52 min |
| Aug 7, 5:49 PM EDT | Tornado Warning | PHI | Chester, Delaware | 26 min |
| Aug 7, 5:57 PM EDT | Severe Thunderstorm Warning | PHI | Delaware, Philadelphia | 48 min |
| Aug 7, 6:00 PM EDT | Tornado Warning | PHI | Delaware | 30 min |
| Aug 7, 6:39 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 27 min |
| Aug 7, 7:10 PM EDT | River Flood Warning | PHI | Delaware | 7 hr |
| Aug 7, 7:17 PM EDT | Areal Flood Warning | PHI | Bucks, Montgomery | 3 hr |
| Aug 7, 6:08 PM EDT | Areal Flood Advisory | PHI | Cumberland, Gloucester, Salem | 3 hr |
| Aug 7, 6:16 PM EDT | Areal Flood Advisory | PHI | Mercer | 2 hr |
| Aug 7, 6:24 PM EDT | Special Marine Warning | PHI | 66 min | |
| Aug 7, 6:41 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Camden, Cumberland, Gloucester, Salem | 49 min |
| Aug 7, 6:57 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Camden, Cumberland, Gloucester, Salem | 48 min |
| Aug 7, 7:24 PM EDT | Special Marine Warning | PHI | 66 min | |
| Aug 7, 7:25 PM EDT | Flash Flood Warning | PHI | Atlantic, Cape May, Cumberland, Gloucester | 4 hr |
| Aug 7, 7:28 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 1 more | 62 min |
Nearby
Flash Flood Warnings in Pennsylvania, 2020Flash Flood Warnings in New Jersey, 2020Every flash flood warning in 2020
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.