Alert archive / New Jersey / Flash Flood Warnings in 2019

Flash Flood Warning 49, NWS Philadelphia/Mount Holly

July 11, 20194 states

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 11, 2019, 6:15 PM EDT for 4 states. It was in force for 4 hr. 14 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 11, 2019, 6:15 PM EDT (22:15 UTC)
Expired: Jul 11, 2019, 10:15 PM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties New Castle County, DE, Kent County, MD, Burlington County, NJ, Camden County, NJ, Gloucester 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), 90 km from the middle of the area, began a volume at 22:17 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 11, 6:50 PM EDT	FLASH FLOOD	1 Sse Rockland, DE	ROCKLAND RD BETWEEN BLACK GATES RD AND MT LEBANON RD CLOSED DUE TO HIGH WATER ON THE ROADWAY.
Jul 11, 7:00 PM EDT	HEAVY RAIN 1.7	Berwyn, PA
Jul 11, 7:30 PM EDT	HEAVY RAIN 2	1 Sse Center City, PA	SUGARHOUSE CASINO TAKING ON WATER THROUGH THE ROOF DUE TO HEAVY RAIN.
Jul 11, 8:02 PM EDT	HEAVY RAIN 4.44	1 W Ambler, PA	STORM TOTAL.
Jul 11, 9:07 PM EDT	HEAVY RAIN 2.02	1 Ne Midvale, DE	ASOS STATION KILG WILMINGTON.
Jul 11, 9:30 PM EDT	HEAVY RAIN 2.07	Willow Grove, PA	MESONET STATION FW0421 WILLOW GROVE.
Jul 11, 9:30 PM EDT	HEAVY RAIN 2.29	1 Nw Newtown Twp, PA	MESONET STATION FW0776 NEWTOWN.
Jul 11, 9:30 PM EDT	HEAVY RAIN 2.42	1 Nw Willow Grove, PA	MESONET STATION FW1161 WILLOW GROVE.
Jul 11, 9:32 PM EDT	HEAVY RAIN 4.45	1 Wsw Ambler, PA	MESONET STATION AR075 AMBLER.
Jul 11, 9:33 PM EDT	HEAVY RAIN 2.22	1 Sw Pennsville, NJ	MESONET STATION FW3239 PENNSVILLE.
Jul 11, 9:42 PM EDT	HEAVY RAIN 2.34	2 Ssw Northampton Twp, PA	MESONET STATION DW5182 SOUTHAMPTON.
Jul 11, 9:43 PM EDT	HEAVY RAIN 2.66	1 Sw Pennsville, NJ	MESONET STATION EW4705 PENNSVILLE.
Jul 11, 9:44 PM EDT	HEAVY RAIN 2.14	1 Se Newtown, PA	MESONET STATION NWTOW NEWTOWN (GEORGE).
Jul 11, 9:44 PM EDT	HEAVY RAIN 2.3	1 Nw Ewing, NJ	ASOS STATION KTTN TRENTON.

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, 10.3 hours before the alert went out and 183 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: 114 J/kg
Mixed-layer CIN: -122 J/kg
Mixed-layer LCL: 1075 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

599 
WGUS51 KPHI 112215
FFWPHI
DEC003-MDC029-NJC005-007-015-021-033-PAC017-029-045-091-101-120215-
/O.NEW.KPHI.FF.W.0049.190711T2215Z-190712T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
615 PM EDT Thu Jul 11 2019

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  New Castle County in northern Delaware...
  Eastern Kent County in northeastern Maryland...
  Western Salem County in southern New Jersey...
  Northwestern Camden County in southern New Jersey...
  Mercer County in central New Jersey...
  Northwestern Gloucester County in southern New Jersey...
  Northwestern Burlington County in southern New Jersey...
  Southeastern Montgomery County in southeastern Pennsylvania...
  Southeastern Bucks County in southeastern Pennsylvania...
  Southeastern Chester County in southeastern Pennsylvania...
  Philadelphia County in southeastern Pennsylvania...
  Delaware County in southeastern Pennsylvania...

* Until 1015 PM EDT.

* At 613 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across portions of the warned area. Flash flooding is 
  expected to begin shortly in the areas of heaviest rain.

* Some locations that could experience flooding include...
  Philadelphia, Trenton, Camden, Wilmington, Middletown, Gloucester
  City, Bensalem, Ewing, Norristown, Chester, Willingboro, West
  Deptford, West Norriton, East Norriton, Pennsville, Florence,
  Bellmawr, Yeadon, Westtown and Woodbury.

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 3974 7534 3941 7544 3946 7554 3957 7551
      3962 7557 3967 7551 3972 7551 3962 7561
      3959 7561 3959 7558 3947 7559 3935 7554
      3935 7555 3929 7565 3928 7580 3990 7563
      4039 7507 4025 7448

$$

Kruzdlo

1 follow-up statement

162 
WGUS71 KPHI 120208
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
1008 PM EDT Thu Jul 11 2019

DEC003-MDC029-NJC005-007-015-021-033-PAC017-029-045-091-101-120216-
/O.EXP.KPHI.FF.W.0049.000000T0000Z-190712T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-Kent MD-Salem NJ-Camden NJ-Mercer NJ-Gloucester NJ-
Burlington NJ-Montgomery PA-Bucks PA-Chester PA-Philadelphia PA-
Delaware PA-
1008 PM EDT Thu Jul 11 2019

...THE FLASH FLOOD WARNING FOR NEW CASTLE...EASTERN KENT...WESTERN
SALEM...NORTHWESTERN CAMDEN...MERCER...NORTHWESTERN GLOUCESTER...
NORTHWESTERN BURLINGTON...SOUTHEASTERN MONTGOMERY...SOUTHEASTERN
BUCKS...SOUTHEASTERN CHESTER...PHILADELPHIA AND DELAWARE COUNTIES
WILL EXPIRE AT 1015 PM EDT...

The heavy rain has ended. The flash flood warning will be allowed to 
expire.  Please continue to heed any remaining road closures.

LAT...LON 3974 7534 3941 7544 3946 7554 3957 7551
      3962 7557 3967 7551 3972 7551 3962 7561
      3959 7561 3959 7558 3947 7559 3935 7554
      3935 7555 3929 7565 3928 7580 3990 7563
      4039 7507 4025 7448

$$

Kruzdlo

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 3:44 AM EDT	Flash Flood Watch	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 4 more	18 hr
Jul 11, 1:23 PM EDT	Special Weather Statement	PHI	Salem	52 min
Jul 11, 1:44 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Gloucester, Salem	61 min
Jul 11, 1:47 PM EDT	Special Marine Warning	PHI		28 min
Jul 11, 2:41 PM EDT	Special Weather Statement	PHI	Gloucester	64 min
Jul 11, 3:13 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Warren	4 hr
Jul 11, 3:33 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Sussex, Warren	4 hr
Jul 11, 5:33 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Somerset	4 hr
Jul 11, 6:04 PM EDT	Special Marine Warning	PHI		86 min
Jul 11, 6:14 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester, Salem	61 min
Jul 11, 6:17 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Middlesex, Somerset	4 hr
Jul 11, 6:58 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Somerset	62 min
Jul 11, 7:22 PM EDT	Tornado Warning	PHI	Burlington	23 min
Jul 11, 7:27 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 5 more	7 hr
Jul 11, 7:44 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Monmouth, Ocean	61 min
Jul 11, 12:33 PM EDT	Special Weather Statement	PHI	Chester	57 min
Jul 11, 2:44 PM EDT	Special Weather Statement	PHI	Bucks, Montgomery	61 min
Jul 11, 2:50 PM EDT	Areal Flood Advisory Emergency	PHI	Berks, Chester, Montgomery	4 hr
Jul 11, 3:00 PM EDT	Flash Flood Warning	PHI	Berks, Chester, Montgomery	8 hr
Jul 11, 3:45 PM EDT	Flash Flood Warning	PHI	Berks, Bucks, Lehigh, Montgomery, Northampton	4 hr
Jul 11, 4:45 PM EDT	Flash Flood Warning Emergency	PHI	Berks, Montgomery	4 hr
Jul 11, 5:12 PM EDT	Flash Flood Warning	PHI	Chester	4 hr
Jul 11, 5:20 PM EDT	Flash Flood Warning	PHI	Bucks, Chester, Montgomery	4 hr
Jul 11, 6:28 PM EDT	River Flood Warning	PHI	Montgomery	22 hr
Jul 11, 6:57 PM EDT	River Flood Warning	PHI	Montgomery	12 hr
Jul 11, 7:03 PM EDT	River Flood Warning	PHI	Chester, Montgomery, Philadelphia	26 hr
Jul 11, 7:19 PM EDT	River Flood Warning	PHI	Chester	7 hr
Jul 11, 7:47 PM EDT	Flash Flood Warning	PHI	Berks, Bucks, Lehigh, Montgomery	3 hr
Jul 11, 5:44 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	61 min
Jul 11, 6:39 PM EDT	Areal Flood Advisory	PHI	Kent, Sussex	4 hr
Jul 11, 3:37 PM EDT	Special Weather Statement	PHI	Cecil	53 min
Jul 11, 4:55 PM EDT	Special Weather Statement	PHI	Cecil, Kent, Queen Anne's	65 min
Jul 11, 5:45 PM EDT	Areal Flood Advisory	PHI	Cecil, Kent, Queen Anne's, Talbot	4 hr
Jul 11, 7:36 PM EDT	Special Weather Statement	PHI	Caroline	54 min

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.