Alert archive / Pennsylvania / Flash Flood Warnings in 2019

Flash Flood Warning 10, NWS Philadelphia/Mount Holly

May 29, 20194 counties in New Jersey; 5 counties in Pennsylvania; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this flash flood warning at May 29, 2019, 6:35 PM EDT for 4 counties in New Jersey; 5 counties in Pennsylvania; New Castle County, Delaware. It was in force for 3 hr. 4 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: May 29, 2019, 6:35 PM EDT (22:35 UTC)
Expired: May 29, 2019, 9:50 PM EDT
In force: 3 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, Gloucester County, NJ, Ocean County, NJ, Berks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 81 km from the middle of the area, began a volume at 22:37 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
May 29, 7:20 PM EDT	FLASH FLOOD	Riverside, NJ	PHOTO SENT OF STREET FLOODING.
May 29, 7:23 PM EDT	HEAVY RAIN 2.9	Medford, NJ
May 29, 7:30 PM EDT	FLASH FLOOD	Delran, NJ	MULTIPLE ROADS IMPASSABLE.
May 29, 9:15 PM EDT	HEAVY RAIN 3.4	Medford, NJ	UPDATES PREVIOUS HEAVY RAIN REPORT FROM MEDFORD WITH FINAL TOTAL.

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, 10.6 hours before the alert went out and 210 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: 292 J/kg
Mixed-layer CIN: -123 J/kg
Mixed-layer LCL: 1463 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 30 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

232 
WGUS51 KPHI 292235
FFWPHI
DEC003-NJC005-007-015-029-PAC011-029-045-091-101-300230-
/O.NEW.KPHI.FF.W.0010.190529T2235Z-190530T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
635 PM EDT Wed May 29 2019

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  Northeastern New Castle County in northern Delaware...
  Central Ocean County in southern New Jersey...
  Northwestern Camden County in southern New Jersey...
  Northwestern Gloucester County in southern New Jersey...
  Northern Burlington County in southern New Jersey...
  South central Berks County in eastern Pennsylvania...
  Southeastern Montgomery County in southeastern Pennsylvania...
  Chester County in southeastern Pennsylvania...
  Philadelphia County in southeastern Pennsylvania...
  Delaware County in southeastern Pennsylvania...

* Until 1030 PM EDT.

* At 634 PM EDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Flash flooding is expected to
  begin shortly in the areas of heaviest rain.

* Some locations that could experience flooding include...
  Philadelphia, Toms River, Camden, West Chester, Gloucester City,
  Cherry Hill, Evesham, Mount Laurel, Norristown, Chester,
  Willingboro, Medford, West Deptford, Phoenixville, West Norriton,
  East Norriton, Coatesville, Lumberton, Bellmawr and Yeadon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3994 7418 3973 7612 3976 7606 3983 7604
      3987 7599 3995 7600 4004 7593 4011 7594
      4014 7588 4024 7603 4009 7496 4007 7496
      4006 7498 4005 7497 4008 7488 3995 7411

$$

Kruzdlo

2 follow-up statements

778 
WGUS71 KPHI 300046
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
846 PM EDT Wed May 29 2019

DEC003-NJC029-PAC011-300053-
/O.CAN.KPHI.FF.W.0010.000000T0000Z-190530T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-Ocean NJ-Berks PA-
846 PM EDT Wed May 29 2019

...THE FLASH FLOOD WARNING FOR NORTHEASTERN NEW CASTLE...CENTRAL
OCEAN AND SOUTH CENTRAL BERKS COUNTIES IS CANCELLED...

The heavy rain has ended. Please continue to heed any remaining road 
closures.

LAT...LON 3989 7469 3984 7518 4019 7571 4009 7496
      4007 7496 4006 7498 4005 7497 4008 7488
      4005 7473

$$

NJC005-007-015-PAC029-045-091-101-300230-
/O.CON.KPHI.FF.W.0010.000000T0000Z-190530T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Camden NJ-Gloucester NJ-Burlington NJ-Montgomery PA-Chester PA-
Philadelphia PA-Delaware PA-
846 PM EDT Wed May 29 2019

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 PM EDT FOR
NORTHWESTERN CAMDEN...NORTH CENTRAL GLOUCESTER...NORTHWESTERN
BURLINGTON...SOUTHEASTERN MONTGOMERY...NORTHEASTERN CHESTER...
PHILADELPHIA AND NORTHEASTERN DELAWARE COUNTIES...

At 843 PM EDT, Doppler radar indicated the rain was coming to an 
end. Although the rain was ending, runoff will continue though the 
evening. The flash flood warning remains in effect until 1030 pm. 

Some locations that could experience flooding include...
Philadelphia, Camden, Gloucester City, Cherry Hill, Evesham, Mount
Laurel, Norristown, Willingboro, Medford, Phoenixville, West
Norriton, East Norriton, Lumberton, Bellmawr, Yeadon, Woodbury,
Burlington, Mount Holly, Riverside and Conshohocken.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3989 7469 3984 7518 4019 7571 4009 7496
      4007 7496 4006 7498 4005 7497 4008 7488
      4005 7473

$$

Kruzdlo

643 
WGUS71 KPHI 300150 RRA
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
950 PM EDT Wed May 29 2019

NJC005-007-015-PAC029-045-091-101-300200-
/O.CAN.KPHI.FF.W.0010.000000T0000Z-190530T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Camden NJ-Gloucester NJ-Burlington NJ-Montgomery PA-Chester PA-
Philadelphia PA-Delaware PA-
950 PM EDT Wed May 29 2019

...THE FLASH FLOOD WARNING FOR NORTHWESTERN CAMDEN...NORTH CENTRAL
GLOUCESTER...NORTHWESTERN BURLINGTON...SOUTHEASTERN MONTGOMERY...
NORTHEASTERN CHESTER...PHILADELPHIA AND NORTHEASTERN DELAWARE
COUNTIES IS CANCELLED...

The heavy rain has ended. Flood waters have receded. Flooding is no
longer expected to pose a threat. Please continue to heed any
remaining road closures.

LAT...LON 3989 7469 3984 7518 4019 7571 4009 7496
      4007 7496 4006 7498 4005 7497 4008 7488
      4005 7473

$$

Iovino

The office that day

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

Issued	Product	Office	Counties	Lasted
May 28, 8:23 PM EDT	Tornado Warning	PHI	Warren	37 min
May 28, 8:30 PM EDT	Tornado Warning	PHI	Morris, Sussex	30 min
May 28, 8:34 PM EDT	Special Marine Warning	PHI		41 min
May 28, 8:35 PM EDT	Severe Thunderstorm Warning	PHI	Cape May, Cumberland	55 min
May 28, 8:37 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	25 min
May 28, 8:44 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Somerset, Sussex, Warren	61 min
May 28, 8:50 PM EDT	Areal Flood Advisory	PHI	Cape May	78 min
May 28, 8:59 PM EDT	Special Marine Warning	PHI		61 min
May 28, 9:33 PM EDT	Areal Flood Advisory	PHI	Morris, Somerset	63 min
May 28, 9:47 PM EDT	Special Marine Warning	PHI		43 min
May 28, 9:52 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	23 min
May 28, 9:57 PM EDT	Special Marine Warning	PHI		44 min
May 28, 10:03 PM EDT	Special Weather Statement	PHI	Atlantic	12 min
May 28, 10:28 PM EDT	Special Marine Warning	PHI		58 min
May 28, 10:30 PM EDT	Special Weather Statement	PHI	Ocean	45 min
May 28, 10:33 PM EDT	Special Weather Statement	PHI	Burlington	27 min
May 28, 10:34 PM EDT	Special Weather Statement	PHI	Monmouth	26 min
May 28, 11:00 PM EDT	Special Weather Statement	PHI	Burlington, Ocean	30 min
May 28, 11:07 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Ocean	38 min
May 28, 11:21 PM EDT	Special Marine Warning	PHI		39 min
May 28, 11:35 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	25 min
May 28, 11:57 PM EDT	Special Marine Warning	PHI		48 min
May 29, 3:18 AM EDT	Flash Flood Watch	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 7 more	18 hr
May 29, 3:10 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	65 min
May 29, 3:38 PM EDT	Tornado Warning	PHI	Hunterdon	37 min
May 29, 3:43 PM EDT	Flash Flood Warning	PHI	Sussex, Warren	4 hr
May 29, 3:43 PM EDT	Severe Thunderstorm Warning	PHI	Sussex, Warren	47 min
May 29, 4:04 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Somerset	41 min
May 29, 4:09 PM EDT	Severe Thunderstorm Warning	PHI	Warren	51 min
May 29, 4:13 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	47 min
May 29, 4:16 PM EDT	Severe Thunderstorm Warning	PHI	Warren	27 min
May 29, 4:27 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Sussex, Warren	51 min
May 29, 4:28 PM EDT	Special Weather Statement	PHI	Morris	32 min
May 29, 4:35 PM EDT	Special Weather Statement	PHI	Sussex	25 min
May 29, 4:37 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Monmouth, Ocean	53 min
May 29, 4:53 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer	67 min
May 29, 5:01 PM EDT	Special Weather Statement	PHI	Hunterdon, Morris	29 min
May 29, 5:03 PM EDT	Special Marine Warning	PHI		57 min
May 29, 5:14 PM EDT	Flash Flood Warning	PHI	Hunterdon, Morris, Sussex, Warren	3 hr
May 29, 5:23 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Sussex, Warren	34 min
May 29, 5:27 PM EDT	Flash Flood Warning	PHI	Hunterdon, Mercer, Middlesex, Morris, Somerset	4 hr
May 29, 5:33 PM EDT	Tornado Warning	PHI	Burlington, Mercer, Monmouth	27 min
May 29, 5:39 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Hunterdon, Mercer, Middlesex, Monmouth, Ocean and 1 more	66 min
May 29, 5:45 PM EDT	Special Weather Statement	PHI	Hunterdon, Morris, Sussex, Warren	30 min
May 29, 6:01 PM EDT	Special Marine Warning	PHI		59 min
May 29, 6:02 PM EDT	Special Weather Statement	PHI	Salem	28 min
May 29, 6:06 PM EDT	Flash Flood Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	4 hr
May 29, 6:06 PM EDT	Severe Thunderstorm Warning	PHI	Burlington	24 min
May 29, 6:29 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester, Ocean	61 min
May 29, 6:35 PM EDT	Special Marine Warning	PHI		55 min
May 29, 7:08 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Camden, Cumberland, Gloucester, Salem	52 min
May 29, 7:12 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Ocean and 1 more	3 hr
May 29, 7:15 PM EDT	Special Marine Warning	PHI		60 min
May 29, 7:25 PM EDT	Special Marine Warning	PHI		65 min
May 29, 7:33 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Cape May, Cumberland, Ocean	42 min
May 29, 7:35 PM EDT	Special Marine Warning	PHI		85 min
May 28, 9:17 PM EDT	River Flood Warning	PHI	Chester	101 min
May 29, 2:19 PM EDT	Special Weather Statement	PHI	Lehigh	41 min
May 29, 2:26 PM EDT	Special Weather Statement	PHI	Montgomery	34 min
May 29, 2:30 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	60 min
May 29, 2:48 PM EDT	Special Weather Statement	PHI	Monroe	27 min
May 29, 2:59 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe	46 min
May 29, 3:17 PM EDT	Tornado Warning	PHI	Bucks, Lehigh	28 min
May 29, 3:29 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe, Northampton	46 min
May 29, 3:29 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	46 min
May 29, 3:43 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	62 min
May 29, 4:18 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	42 min
May 29, 4:42 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	48 min
May 29, 4:50 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Chester, Lehigh, Montgomery, Northampton	40 min
May 29, 4:55 PM EDT	Flash Flood Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery	4 hr
May 29, 5:08 PM EDT	Tornado Warning	PHI	Bucks, Montgomery	27 min
May 29, 5:49 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Delaware, Montgomery, Philadelphia	41 min
May 29, 6:22 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery, Philadelphia	53 min
May 29, 6:11 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	34 min
May 29, 6:30 PM EDT	Special Weather Statement	PHI	Kent	30 min
May 29, 6:58 PM EDT	Special Weather Statement	PHI	Kent	32 min

Nearby

Flash Flood Warnings in Pennsylvania, 2019 Flash Flood Warnings in New Jersey, 2019 Flash Flood Warnings in Delaware, 2019 Every flash flood warning in 2019

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.