Alert archive / New Jersey / Flash Flood Warnings in 2020

Flash Flood Warning 21, NWS Philadelphia/Mount Holly

July 10, 2020New Castle County, Delaware; 5 counties in New Jersey; 4 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 10, 2020, 12:56 PM EDT for New Castle County, Delaware; 5 counties in New Jersey; 4 counties in Pennsylvania. It was in force for 4 hr. 35 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: Jul 10, 2020, 12:56 PM EDT (16:56 UTC)
Expired: Jul 10, 2020, 5:00 PM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties New Castle County, DE, Burlington County, NJ, Camden County, NJ, Cumberland County, NJ, Gloucester County, NJ, Salem County, NJ, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 72 km from the middle of the area, began a volume at 16:56 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
Jul 10, 12:57 PM EDT	FLASH FLOOD	2 Nnw Seabrook Farms, NJ	FLOODING ON ROUTE 77 NEAR FRIESBURG ROAD. ALL LANES CLOSED.
Jul 10, 1:05 PM EDT	FLASH FLOOD	1 Wsw Collingdale, PA	WATER RESCUE ON OAK LANE IN DARBY TWP. TIME BASED ON DISPATCH REPORT.
Jul 10, 1:08 PM EDT	FLASH FLOOD	1 Sse Ridley Park, PA	WATER RESCUE ON INDUSTRIAL HIGHWAY IN TINICUM TWP. TIME BASED ON DISPATCH REPORT.
Jul 10, 1:12 PM EDT	FLASH FLOOD	Lansdowne, PA	WATER RESCUE NEAR THE UNION AVENUE AND BARTRAM AVENUE INTERSECTION IN UPPER DARBY TWP. TIME BASED ON INITIAL DOT REPORT.
Jul 10, 1:27 PM EDT	HEAVY RAIN 1.75	Berwyn, PA
Jul 10, 1:31 PM EDT	FLASH FLOOD	1 Ne Upper Providence T, PA	REPORTS OF A WATER RESCUE NEAR ROSETREE ROAD AND SANDY BANK ROAD.
Jul 10, 1:38 PM EDT	FLASH FLOOD	Mantua, PA	I-76 WESTBOUND BETWEEN I-676 AND THE SPRING GARDEN STREET EXIT CLOSED DUE TO FLOODING. A FEW OTHER LANE RESTRICTIONS AND CLOSURES REPORTED AROUND THE AREA AS WELL.
Jul 10, 1:48 PM EDT	HEAVY RAIN 3.65	Sewell, NJ
Jul 10, 1:50 PM EDT	FLASH FLOOD	1 Sse Glassboro, NJ	FLOODING SOUTH OF US 322 ON ROUTE 47 IN GLASSBORO. ALL LANES CLOSED AND DETOURED.
Jul 10, 2:00 PM EDT	FLASH FLOOD	1 Se Manayunk, PA	VEHICLE STUCK IN FLOOD WATERS 2 TO 4 FEET DEEP ON RIDGE AVENUE. TIME ESTIMATED BASED ON RADAR AND SURROUNDING REPORTS.
Jul 10, 2:04 PM EDT	FLASH FLOOD	Trainer, PA	WATER RESCUE ON MAIN STREAT NEAR THE RAILROAD TRACKS. TIME BASED ON DISPATCH REPORT.
Jul 10, 2:07 PM EDT	FLOOD	1 Ne Wilmington, DE	BUSINESS ROUTE 13 NEAR WALNUT STREET AND BRANDYWINE CREEK WAS FLOODED. TIME BASED ON FIRST DOT REPORT.
Jul 10, 2:27 PM EDT	FLASH FLOOD	Philadelphia, PA	PENNYPACK CREEK HAS EXCEEDED ITS FLOOD STAGE OF 7.0 FEET.
Jul 10, 2:30 PM EDT	FLASH FLOOD	1 Nne Wenonah, NJ	GLASSBORO ROAD IN MANTUA CLOSED DUE TO FLOODING.
Jul 10, 2:30 PM EDT	FLASH FLOOD	2 Wsw Harrisonville, NJ	FLASH FLOODING ON STATE HIGHWAY 45 BETWEEN POINT AIRY ROAD IN PILESGROVE TWP AND SWEDESBORO-HARRISONVILLE ROAD IN SOUTH HARRISON TWP. ALL LANES CLOSED. TIME BASED ON RADAR AND SURROUNDING REPORTS.
Jul 10, 2:48 PM EDT	FLASH FLOOD	1 Sw Trooper, PA	FLOODING REPORTED ALONG A FEW ROAD CROSSINGS OF MINE RUN INCLUDING PARK AVE AND CRAWFORD ROAD.
Jul 10, 2:56 PM EDT	HEAVY RAIN 2.75	Berwyn, PA
Jul 10, 3:06 PM EDT	FLASH FLOOD	Chester, PA	FLOODING CAUSED ROAD CLOSURES ON BARCLAY STREET AND FULTON STREET. TIME BASED ON DISPATCH REPORT.
Jul 10, 3:06 PM EDT	HEAVY RAIN 2.17	2 Se Exton, PA
Jul 10, 3:09 PM EDT	FLOOD	Garfield Park, DE	FLOODING ON NEW CASTLE AVENUE AT HALCYON DRIVE. TIME BASED ON FIRST DOT REPORT.
Jul 10, 3:15 PM EDT	FLASH FLOOD	2 Wsw Newtown Square, PA	THE GAUGE AT CRUM CREEK IN NEWTOWN SQUARE REACHED FLOOD STAGE.
Jul 10, 3:16 PM EDT	FLASH FLOOD	1 Ene Sewell, NJ	MANTUA CREEK FLOWING OVER GLASSBORO ROAD.
Jul 10, 3:30 PM EDT	HEAVY RAIN 5.28	Franklin Twp, NJ
Jul 10, 3:31 PM EDT	FLOOD	Franklin Twp, NJ	FLOODING OF ROADS NEAR STREAMS AND CREEKS.
Jul 10, 3:45 PM EDT	FLOOD	1 Nw Willistown Twp, PA	HUNTERS RUN FLOODING A PORTION OF DUTTON MILL ROAD. TIME BASED ON DISPATCH REPORT.
Jul 10, 3:45 PM EDT	FLASH FLOOD	Pitman, NJ	THE GAUGE ON MANTUA CREEK AT PITMAN REACHED FLOOD STAGE.
Jul 10, 3:48 PM EDT	HEAVY RAIN 4	Washington Twp, NJ
Jul 10, 3:53 PM EDT	FLASH FLOOD	Gloucester City, NJ	FLOODED ROADS BEHIND THE GLOUCESTER CITY MIDDLE SCHOOL. WATER WAS 2 TO 4 FEET DEEP IN SOME AREAS.
Jul 10, 3:59 PM EDT	FLASH FLOOD	1 Se Middletown Twp., PA	FLOODING CLOSED NEW MIDDLETOWN ROAD NEAR INDIAN LANE. TIME BASED ON DISPATCH REPORT.
Jul 10, 4:11 PM EDT	FLASH FLOOD	Lansdowne, PA	SECOND WATER RESCUE ON UNION AVENUE NEAR BARTRAM AVENUE. TIME BASED ON DISPATCH REPORT.
Jul 10, 4:19 PM EDT	HEAVY RAIN 4.75	Pitman, NJ
Jul 10, 4:24 PM EDT	FLASH FLOOD	Eddystone, PA	FLOODING CLOSED LEIPER STREET NEAR 10TH STREET IN EDDYSTONE BOROUGH. TIME BASED ON DISPATCH REPORT.
Jul 10, 4:45 PM EDT	FLASH FLOOD	Darby, PA	MACDADE BOULEVARD CLOSED NEAR MAIN STREET FROM FLOODING. TIME BASED ON DISPATCH REPORT.
Jul 10, 4:45 PM EDT	HEAVY RAIN 2.21	Newark, DE	DE-NC-2.
Jul 10, 5:00 PM EDT	HEAVY RAIN 3.13	West Chester, PA	PA-CH-9.

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, 4.9 hours before the alert went out and 213 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 33 J/kg
Mixed-layer CIN: -176 J/kg
Mixed-layer LCL: 818 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -49 m²/s²
0-3 km storm-relative helicity: -56 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

419 
WGUS51 KPHI 101656
FFWPHI
DEC003-NJC005-007-011-015-033-PAC029-045-091-101-102100-
/O.NEW.KPHI.FF.W.0021.200710T1656Z-200710T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1256 PM EDT Fri Jul 10 2020

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  New Castle County in northern Delaware...
  Northwestern Cumberland County in southern New Jersey...
  Salem County in southern New Jersey...
  Northwestern Camden County in southern New Jersey...
  Gloucester County in southern New Jersey...
  Northwestern Burlington County in southern New Jersey...
  Southeastern Montgomery County in southeastern Pennsylvania...
  Eastern Chester County in southeastern Pennsylvania...
  Philadelphia County in southeastern Pennsylvania...
  Delaware County in southeastern Pennsylvania...

* Until 500 PM EDT.

* At 1255 PM EDT, Doppler radar indicated heavy rain falling across
  the warned area. Up to two inches of rain have already fallen.
  Flash flooding is likely.

  HAZARD...Flash flooding caused by heavy rain.

  SOURCE...Radar indicated.

  IMPACT...Flooding of small creeks and streams, urban areas, 
           highways, streets and underpasses as well as other 
           drainage and low lying areas.

* Some locations that could experience flooding include...
  Philadelphia, Camden, Wilmington, Newark, Millville, Bridgeton,
  Middletown, West Chester, Gloucester City, Cherry Hill, Norristown,
  Chester, Deptford, West Deptford, Glassboro, Lindenwold,
  Phoenixville, West Norriton, East Norriton and Pennsville.

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.

Turn around...don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.

&&

LAT...LON 4018 7553 4007 7497 4006 7498 4005 7497
      4007 7494 4006 7491 3931 7515 3940 7577
      3971 7578

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-3 INCHES IN 1 HOUR

$$

Kruzdlo

2 follow-up statements

919 
WGUS71 KPHI 101852
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
252 PM EDT Fri Jul 10 2020

DEC003-NJC005-007-011-015-033-PAC029-045-091-101-102100-
/O.CON.KPHI.FF.W.0021.000000T0000Z-200710T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-Cumberland NJ-Salem NJ-Camden NJ-Gloucester NJ-
Burlington NJ-Montgomery PA-Chester PA-Philadelphia PA-Delaware PA-
252 PM EDT Fri Jul 10 2020

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 500 PM EDT FOR NEW
CASTLE...NORTHWESTERN CUMBERLAND...SALEM...NORTHWESTERN CAMDEN...
GLOUCESTER...NORTHWESTERN BURLINGTON...SOUTHEASTERN MONTGOMERY...
EASTERN CHESTER...PHILADELPHIA AND DELAWARE COUNTIES...

At 249 PM EDT, Doppler radar and automated gauges indicated heavy 
rain falling across the warned area. Various roads are closed across 
the warned area due to flash flooding. Frankford Creek and Pennypack 
Creek are in flood stage. Two to four inches of rain have fallen. 
Flash flooding is already occurring.

HAZARD...Flash flooding caused by heavy rain.

SOURCE...Radar and automated gauges.

IMPACT...Flooding of small creeks and streams, urban areas, 
         highways, streets and underpasses as well as other drainage 
         and low lying areas.

Some locations that could experience flooding include...
Philadelphia, Camden, Wilmington, Newark, Millville, Bridgeton,
Middletown, West Chester, Gloucester City, Cherry Hill, Norristown,
Chester, Deptford, West Deptford, Glassboro, Lindenwold,
Phoenixville, West Norriton, East Norriton and Pennsville.

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.

Turn around...don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.

&&

LAT...LON 4018 7553 4007 7497 4006 7498 4005 7497
      4007 7494 4006 7491 3931 7515 3940 7577
      3971 7578

FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR

$$

Staarmann

062 
WGUS71 KPHI 102053
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
453 PM EDT Fri Jul 10 2020

DEC003-NJC005-007-011-015-033-PAC029-045-091-101-102100-
/O.EXP.KPHI.FF.W.0021.000000T0000Z-200710T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-Cumberland NJ-Salem NJ-Camden NJ-Gloucester NJ-
Burlington NJ-Montgomery PA-Chester PA-Philadelphia PA-Delaware PA-
453 PM EDT Fri Jul 10 2020

...THE FLASH FLOOD WARNING FOR NEW CASTLE...NORTHWESTERN
CUMBERLAND...SALEM...NORTHWESTERN CAMDEN...GLOUCESTER...NORTHWESTERN
BURLINGTON...SOUTHEASTERN MONTGOMERY...EASTERN CHESTER...PHILADELPHIA
AND DELAWARE COUNTIES WILL EXPIRE AT 500 PM EDT...

While heavy rain has moved out of the area, moderate rain continues 
to fall. While life-threatening flooding is no longer a threat, this 
Flash Flood Warning has been replaced with a Flood Warning for the 
same area for small streams and low lying areas that continue to 
flood. Please continue to heed any remaining road closures.

LAT...LON 4018 7553 4007 7497 4006 7498 4005 7497
      4007 7494 4006 7491 3931 7515 3940 7577
      3971 7578

$$
Miketta

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 10, 6:34 AM EDT	Flash Flood Warning	PHI	Sussex	6 hr
Jul 10, 9:21 AM EDT	Areal Flood Advisory	PHI	Kent, New Castle, Sussex	8 hr
Jul 10, 11:02 AM EDT	Areal Flood Advisory	PHI	New Castle	4 hr
Jul 10, 12:22 PM EDT	Areal Flood Warning	PHI	Sussex	3 hr
Jul 10, 3:38 PM EDT	River Flood Warning	PHI	New Castle	4 hr
Jul 10, 4:48 PM EDT	Areal Flood Warning	PHI	New Castle	4 hr
Jul 10, 6:48 AM EDT	Special Marine Warning	PHI		57 min
Jul 10, 7:11 AM EDT	Special Marine Warning	PHI		94 min
Jul 10, 7:42 AM EDT	Special Marine Warning	PHI		33 min
Jul 10, 8:20 AM EDT	Flash Flood Warning Considerable damage threat	PHI	Cape May	4 hr
Jul 10, 8:34 AM EDT	Special Marine Warning	PHI		30 min
Jul 10, 9:01 AM EDT	Flash Flood Warning	PHI	Atlantic, Cape May	3 hr
Jul 10, 9:13 AM EDT	Special Marine Warning	PHI		21 min
Jul 10, 9:27 AM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 1 more	4 hr
Jul 10, 10:31 AM EDT	Flash Flood Warning	PHI	Atlantic, Burlington, Ocean	4 hr
Jul 10, 10:35 AM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Gloucester, Ocean	4 hr
Jul 10, 11:08 AM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Mercer, Monmouth, Ocean	4 hr
Jul 10, 12:35 PM EDT	Areal Flood Advisory	PHI	Mercer, Middlesex, Monmouth, Ocean, Somerset	3 hr
Jul 10, 12:49 PM EDT	Flash Flood Warning	PHI	Mercer, Middlesex, Monmouth, Ocean, Somerset	4 hr
Jul 10, 1:15 PM EDT	Flash Flood Warning	PHI	Middlesex, Monmouth, Somerset	4 hr
Jul 10, 1:41 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Somerset	4 hr
Jul 10, 2:08 PM EDT	Areal Flood Advisory	PHI	Morris, Somerset	4 hr
Jul 10, 3:12 PM EDT	Areal Flood Advisory	PHI	Sussex, Warren	4 hr
Jul 10, 4:30 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Ocean	4 hr
Jul 10, 5:39 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Somerset	4 hr
Jul 10, 3:25 PM EDT	Areal Flood Advisory	PHI	Chester	4 hr
Jul 10, 4:05 PM EDT	River Flood Warning	PHI	Delaware	4 hr

Nearby

Flash Flood Warnings in New Jersey, 2020 Flash Flood Warnings in Pennsylvania, 2020 Flash Flood Warnings in Delaware, 2020 Every 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.