Alert archive / New Jersey / Flash Flood Warnings in 2017

Flash Flood Warning 28, NWS Philadelphia/Mount Holly

July 24, 2017Delaware County, Montgomery County, Philadelphia County, Pennsylvania; 4 counties in New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 24, 2017, 3:00 AM EDT for Delaware County, Montgomery County, Philadelphia County, Pennsylvania; 4 counties in 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: Jul 24, 2017, 3:00 AM EDT (07:00 UTC)
Expired: Jul 24, 2017, 7:00 AM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Salem County, NJ, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 55 km from the middle of the area, began a volume at 07:03 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 24, 4:28 AM EDT	FLASH FLOOD	Morgan Village, NJ	A SEDAN WAS STUCK IN HIGH WATER AT TULIP AND MASTERS STREET IN CAMDEN.
Jul 24, 4:30 AM EDT	FLASH FLOOD	1 Sw Ablett Village, NJ	STREET FLOODING IN CAMDEN FORCED THE RIVERLINE TO BE SUSPENDED AT ONE POINT.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 7.0 hours before the alert went out and 212 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 725 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 58 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

473 
WGUS51 KPHI 240700
FFWPHI
NJC005-007-015-033-PAC045-091-101-241100-
/O.NEW.KPHI.FF.W.0028.170724T0700Z-170724T1100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
300 AM EDT MON JUL 24 2017

The National Weather Service in Mount Holly NJ has issued a

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

* Until 700 AM EDT

* At 259 AM EDT...Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Around one inch of rain occurs 
  within an hour. Flash flooding is expected to begin shortly in the 
  areas of heaviest rain.

* Some locations that could experience flooding include...
  Philadelphia, Camden, Gloucester City, Cherry Hill, Evesham, Mount
  Laurel, Chester, Willingboro, Deptford, Voorhees, Medford, West
  Deptford, Lindenwold, Lumberton, Bellmawr, Yeadon, Woodbury,
  Riverside, Carneys Point and Berlin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.

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 3981 7491 3970 7548 3982 7538 4006 7535
      4008 7496 4006 7498 4005 7497 4007 7492
      3993 7473

$$
Drag

1 follow-up statement

813 
WGUS71 KPHI 240853
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
453 AM EDT MON JUL 24 2017

NJC005-007-015-033-PAC045-091-101-240902-
/O.CAN.KPHI.FF.W.0028.000000T0000Z-170724T1100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Salem NJ-Camden NJ-Gloucester NJ-Burlington NJ-Montgomery PA-
Philadelphia PA-Delaware PA-
453 AM EDT MON JUL 24 2017

...THE FLASH FLOOD WARNING FOR NORTHWESTERN SALEM...NORTHWESTERN
CAMDEN...NORTHWESTERN GLOUCESTER...NORTHWESTERN BURLINGTON...
SOUTHEASTERN MONTGOMERY...PHILADELPHIA AND EASTERN DELAWARE COUNTIES
IS CANCELLED...

The heavy rain has ended. Any minor flooding should be receding. 
Flooding is no longer expected to pose a threat. Please continue to 
heed any remaining road closures.

LAT...LON 3981 7491 3970 7548 3982 7538 4006 7535
      4008 7496 4006 7498 4005 7497 4007 7492
      3993 7473

$$

Drag

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 24, 1:33 AM EDT	Areal Flood Advisory	PHI	Bucks, Delaware, Montgomery, Philadelphia	5 hr
Jul 24, 2:34 AM EDT	Severe Thunderstorm Warning	PHI	Delaware, Philadelphia	41 min
Jul 24, 3:17 AM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Lehigh, Monroe, Montgomery, Northampton	118 min
Jul 24, 3:21 AM EDT	Areal Flood Advisory	PHI	Bucks	3 hr
Jul 24, 3:36 AM EDT	Areal Flood Advisory	PHI	Monroe, Northampton	6 hr
Jul 24, 3:47 AM EDT	Areal Flood Advisory	PHI	Carbon, Lehigh, Monroe, Northampton	118 min
Jul 24, 5:23 PM EDT	Special Weather Statement	PHI	Berks	37 min
Jul 24, 5:31 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	59 min
Jul 24, 6:15 PM EDT	Special Weather Statement	PHI	Berks	45 min
Jul 24, 6:30 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery	60 min
Jul 24, 6:43 PM EDT	Flash Flood Warning	PHI	Berks, Lehigh, Northampton	4 hr
Jul 24, 6:47 PM EDT	Flash Flood Warning	PHI	Berks	4 hr
Jul 24, 7:07 PM EDT	Areal Flood Advisory	PHI	Northampton	113 min
Jul 24, 7:07 PM EDT	Special Weather Statement	PHI	Berks	23 min
Jul 24, 7:12 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	2 hr
Jul 24, 7:16 PM EDT	Areal Flood Advisory	PHI	Berks, Montgomery	119 min
Jul 24, 7:23 PM EDT	Flash Flood Warning	PHI	Bucks, Lehigh, Montgomery	4 hr
Jul 24, 7:26 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Montgomery	49 min
Jul 24, 7:42 PM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Montgomery	2 hr
Jul 24, 7:48 PM EDT	Areal Flood Advisory	PHI	Bucks	117 min
Jul 24, 7:50 PM EDT	Severe Thunderstorm Warning	PHI	Montgomery, Philadelphia	25 min
Jul 23, 9:39 PM EDT	Areal Flood Advisory	PHI	Gloucester, Salem	4 hr
Jul 23, 10:18 PM EDT	Flash Flood Warning	PHI	Atlantic, Camden, Cumberland, Gloucester, Salem	8 hr
Jul 23, 10:23 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Gloucester, Salem	52 min
Jul 23, 10:54 PM EDT	Special Weather Statement	PHI	Gloucester	51 min
Jul 23, 11:38 PM EDT	Tornado Warning	PHI	Atlantic, Cape May	37 min
Jul 23, 11:41 PM EDT	Special Marine Warning	PHI		64 min
Jul 23, 11:43 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Cape May, Cumberland, Ocean, Salem	6 hr
Jul 23, 11:50 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Monmouth, Ocean	6 hr
Jul 24, 12:04 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cumberland, Gloucester, Salem	41 min
Jul 24, 12:35 AM EDT	Special Marine Warning	PHI		55 min
Jul 24, 12:56 AM EDT	Special Weather Statement	PHI	Atlantic	34 min
Jul 24, 1:23 AM EDT	Special Marine Warning	PHI		97 min
Jul 24, 2:02 AM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Gloucester, Salem	43 min
Jul 24, 2:08 AM EDT	Special Marine Warning	PHI		97 min
Jul 24, 2:10 AM EDT	Special Marine Warning	PHI		95 min
Jul 24, 2:44 AM EDT	Special Marine Warning	PHI		91 min
Jul 24, 3:03 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more	57 min
Jul 24, 3:34 AM EDT	Special Marine Warning	PHI		116 min
Jul 24, 3:55 AM EDT	Severe Thunderstorm Warning	PHI	Burlington, Ocean	50 min
Jul 24, 9:30 AM EDT	Areal Flood Advisory	PHI	Hunterdon, Middlesex, Morris, Somerset	60 min
Jul 24, 10:04 AM EDT	Small Craft Advisory for Hazardous Seas	PHI		8 hr
Jul 24, 10:40 AM EDT	Areal Flood Warning	PHI	Cumberland	10 hr
Jul 24, 2:55 PM EDT	Coastal Flood Advisory	PHI	Atlantic, Burlington, Cape May, Middlesex, Monmouth, Ocean	11 hr

Nearby

Flash Flood Warnings in New Jersey, 2017 Flash Flood Warnings in Pennsylvania, 2017 Every flash flood warning in 2017

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.