Alert archive / New Jersey / Flash Flood Warnings in 2019

Flash Flood Warning 30, NWS Philadelphia/Mount Holly

June 20, 20197 counties in New Jersey; New Castle County, Delaware; 5 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jun 20, 2019, 2:48 PM EDT for 7 counties in New Jersey; New Castle County, Delaware; 5 counties in Pennsylvania. It was in force for 4 hr. 3 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: Jun 20, 2019, 2:48 PM EDT (18:48 UTC)
Expired: Jun 20, 2019, 6:45 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, Hunterdon County, NJ, Mercer County, NJ, Salem County, NJ, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Dover AFB radar (KDOX), 93 km from the middle of the area, began a volume at 18:49 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
Jun 20, 3:45 PM EDT	FLASH FLOOD	1 Ne Upper Dublin Twp, PA	WATER RESCUES REPORTED AT FORT WASHINGTON AVE AND TERRACE DRIVE IN UPPER DUBLIN.
Jun 20, 3:45 PM EDT	FLASH FLOOD	Horsham, PA	WATER RESCUES REPORTED AT DRESHER RD AND HORSHAM RD IN HORSHAM.
Jun 20, 5:29 PM EDT	FLOOD	1 Wsw Horsham Twp, PA	LIMEKILN PIKE CLOSED BETWEEN HORSHAM RD. AND TENNIS AVE IN HORSHAM.

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, 6.8 hours before the alert went out and 182 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: 213 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 1000 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: -2 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.

554 
WGUS51 KPHI 201848
FFWPHI
DEC003-NJC005-007-011-015-019-021-033-PAC017-029-045-091-101-202245-
/O.NEW.KPHI.FF.W.0030.190620T1848Z-190620T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
248 PM EDT Thu Jun 20 2019

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  Northern New Castle County in northern Delaware...
  Northwestern Camden County in southern New Jersey...
  Northwestern Mercer County in central New Jersey...
  Northwestern Cumberland County in southern New Jersey...
  Salem County in southern New Jersey...
  Southeastern Hunterdon County in northwestern New Jersey...
  Northwestern Gloucester County in southern New Jersey...
  West central Burlington County in southern New Jersey...
  Southeastern Montgomery County in southeastern Pennsylvania...
  Central Bucks County in southeastern Pennsylvania...
  East central Chester County in southeastern Pennsylvania...
  Philadelphia County in southeastern Pennsylvania...
  Delaware County in southeastern Pennsylvania...

* Until 645 PM EDT.

* At 240 PM EDT, Doppler radar indicated thunderstorms were about to 
  move over areas that received very heavy rainfall last night. Up 
  to one and one-half inches can be expected with these 
  thunderstorms. The rain will fall in a very short time and produce 
  flash flooding across portions of the warned area. 

Creeks and streams remain high. Some are still flooding from last 
night's rain. The thunderstorms expected over the next hour or two 
will add more runoff and exacerbate current flooding. 

Flash flooding is expected to
  begin shortly in the areas of heaviest rain.

* Some locations that could experience flooding include...
  Philadelphia, Camden, Wilmington, Gloucester City, Bensalem, Ewing,
  Norristown, Chester, Deptford, West Deptford, Lansdale, West
  Norriton, East Norriton, Pennsville, Bellmawr, Yeadon, Woodbury,
  Pitman, Doylestown and Byram.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3951 7577 4046 7515 4042 7474 3946 7530
      3949 7554 3954 7554 3957 7551 3962 7557
      3966 7552 3971 7549 3972 7551 3962 7561
      3960 7561 3958 7556 3958 7557 3951 7557
      3951 7556 3949 7559

$$

Kruzdlo

1 follow-up statement

408 
WGUS71 KPHI 202238
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
638 PM EDT Thu Jun 20 2019

DEC003-NJC005-007-011-015-019-021-033-PAC017-029-045-091-101-202245-
/O.EXP.KPHI.FF.W.0030.000000T0000Z-190620T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-Camden NJ-Mercer NJ-Cumberland NJ-Salem NJ-
Hunterdon NJ-Gloucester NJ-Burlington NJ-Montgomery PA-Bucks PA-
Chester PA-Philadelphia PA-Delaware PA-
638 PM EDT Thu Jun 20 2019

...THE FLASH FLOOD WARNING FOR NORTHERN NEW CASTLE...NORTHWESTERN
CAMDEN...NORTHWESTERN MERCER...NORTHWESTERN CUMBERLAND...SALEM...
SOUTHEASTERN HUNTERDON...NORTHWESTERN GLOUCESTER...WEST CENTRAL
BURLINGTON...SOUTHEASTERN MONTGOMERY...CENTRAL BUCKS...EAST CENTRAL
CHESTER...PHILADELPHIA AND DELAWARE COUNTIES WILL EXPIRE AT 645 PM
EDT...

The heavy rain has ended. The flash flood warning will expire at 645 
pm.

LAT...LON 3951 7577 4046 7515 4042 7474 3946 7530
      3949 7554 3954 7554 3957 7551 3962 7557
      3966 7552 3971 7549 3972 7551 3962 7561
      3960 7561 3958 7556 3958 7557 3951 7557
      3951 7556 3949 7559

$$

Kruzdlo

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 19, 8:36 PM EDT	Areal Flood Advisory	PHI	Ocean	2 hr
Jun 19, 8:39 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Ocean	2 hr
Jun 19, 11:19 PM EDT	Flash Flood Warning	PHI	Camden, Gloucester, Salem	5 hr
Jun 19, 11:25 PM EDT	Areal Flood Warning	PHI	Burlington	5 hr
Jun 20, 1:49 AM EDT	Flash Flood Warning	PHI	Burlington	3 hr
Jun 20, 4:32 AM EDT	Marine Dense Fog Advisory	PHI		5 hr
Jun 20, 4:38 AM EDT	Areal Flood Warning	PHI	Burlington, Camden, Gloucester	14 hr
Jun 20, 2:26 PM EDT	Special Weather Statement	PHI	Gloucester, Hunterdon, Salem, Somerset	94 min
Jun 20, 2:33 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	57 min
Jun 20, 3:20 PM EDT	Flash Flood Warning	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Mercer and 4 more	4 hr
Jun 20, 3:21 PM EDT	Special Weather Statement	PHI	Atlantic	24 min
Jun 20, 3:36 PM EDT	Special Weather Statement	PHI	Burlington, Mercer, Middlesex, Ocean	54 min
Jun 20, 4:05 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Middlesex, Monmouth, Ocean	4 hr
Jun 20, 4:06 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	54 min
Jun 20, 4:23 PM EDT	Special Weather Statement	PHI	Cumberland	37 min
Jun 20, 4:24 PM EDT	Areal Flood Advisory	PHI	Mercer, Middlesex, Monmouth, Morris, Somerset	3 hr
Jun 20, 4:26 PM EDT	Special Marine Warning	PHI		64 min
Jun 20, 4:40 PM EDT	Special Weather Statement	PHI	Ocean	35 min
Jun 20, 4:44 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	31 min
Jun 20, 5:10 PM EDT	Special Weather Statement	PHI	Atlantic	35 min
Jun 20, 5:15 PM EDT	Special Marine Warning	PHI		90 min
Jun 20, 6:50 PM EDT	Areal Flood Warning	PHI	Burlington	10 hr
Jun 19, 11:11 PM EDT	Flash Flood Warning	PHI	New Castle	6 hr
Jun 19, 11:46 PM EDT	River Flood Warning	PHI	New Castle	104 min
Jun 20, 5:10 AM EDT	Areal Flood Warning	PHI	New Castle	12 hr
Jun 20, 2:13 PM EDT	Areal Flood Advisory	PHI	New Castle	4 hr
Jun 20, 7:55 PM EDT	Areal Flood Advisory	PHI	Kent, Sussex	4 hr
Jun 19, 9:09 PM EDT	Areal Flood Warning	PHI	Philadelphia	3 hr
Jun 19, 9:50 PM EDT	Special Weather Statement	PHI	Lebanon	55 min
Jun 19, 10:47 PM EDT	Areal Flood Advisory	PHI	Berks	50 min
Jun 19, 11:34 PM EDT	Flash Flood Warning	PHI	Berks	6 hr
Jun 20, 12:39 AM EDT	Areal Flood Advisory	PHI	Montgomery	7 min
Jun 20, 12:45 AM EDT	Flash Flood Warning	PHI	Montgomery, Philadelphia	6 hr
Jun 20, 3:40 AM EDT	River Flood Warning	PHI	Delaware	111 min
Jun 20, 3:59 AM EDT	River Flood Warning	PHI	Chester	7 hr
Jun 20, 5:19 AM EDT	River Flood Warning	PHI	Chester, Delaware	13 hr
Jun 20, 5:24 AM EDT	Areal Flood Warning	PHI	Berks	6 hr
Jun 20, 6:14 AM EDT	Areal Flood Warning	PHI	Montgomery, Philadelphia	10 hr
Jun 20, 6:31 AM EDT	River Flood Warning	PHI	Delaware	3 hr
Jun 20, 1:24 PM EDT	Special Weather Statement	PHI	Berks, Chester, Montgomery	51 min
Jun 20, 1:28 PM EDT	Areal Flood Advisory	PHI	Berks	4 hr
Jun 20, 4:58 PM EDT	River Flood Warning	PHI	Chester	4 hr
Jun 20, 6:33 PM EDT	Areal Flood Warning	PHI	Montgomery	3 hr

Nearby

Flash Flood Warnings in New Jersey, 2019 Flash Flood Warnings in Pennsylvania, 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.