Alert archive / New Jersey / Flash Flood Warnings in 2017

Flash Flood Warning 11, NWS Philadelphia/Mount Holly

July 13, 20175 counties in New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 13, 2017, 5:31 PM EDT for 5 counties in New Jersey; Bucks County, Pennsylvania. It was in force for 3 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 13, 2017, 5:31 PM EDT (21:31 UTC)
Expired: Jul 13, 2017, 8:30 PM EDT
In force: 3 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Burlington County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Ocean County, NJ, Bucks County, PA

The radar

The Philadelphia radar (KDIX), 48 km from the middle of the area, began a volume at 21:30 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 13, 6:21 PM EDT	HEAVY RAIN 1.5	Jackson Twp, NJ	FELL WITHIN 30 MIN.
Jul 13, 6:30 PM EDT	FLOOD	Elberon, NJ	MULTIPLE VEHICLES STUCK IN WATER ON LINCOLN AVENUE. TIME ESTIMATED.

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 12:00Z, 9.5 hours before the alert went out and 146 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: 572 J/kg
Mixed-layer CIN: -82 J/kg
Mixed-layer LCL: 1449 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 103 m²/s²
0-3 km storm-relative helicity: 140 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

As transmitted.

832 
WGUS51 KPHI 132131
FFWPHI
NJC005-021-023-025-029-PAC017-140030-
/O.NEW.KPHI.FF.W.0011.170713T2131Z-170714T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
531 PM EDT THU JUL 13 2017

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  Northern Ocean County in southern New Jersey...
  Mercer County in central New Jersey...
  Northern Burlington County in southern New Jersey...
  Monmouth County in central New Jersey...
  Middlesex County in northern New Jersey...
  Southeastern Bucks County in southeastern Pennsylvania...

* Until 830 PM EDT

* At 529 PM EDT...Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Some thunderstorms are 
  producing rainfall rates up to 2 inches per hour.  Flash flooding 
  is expected to begin shortly in the pockets of heaviest rain.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles. Be careful during the evening commute.

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 prone to flash flooding 
should take precautions to protect life and property.

&&

LAT...LON 4001 7404 4022 7515 4032 7505 4036 7495
      4035 7486 4038 7487 4042 7479 4037 7472
      4038 7462 4037 7461 4051 7447 4053 7449
      4053 7445 4050 7426 4049 7427 4044 7420
      4041 7398 4048 7402 4048 7401 4043 7397

$$

jjm

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 8:22 PM EDT	Special Weather Statement	PHI	Morris	53 min
Jul 12, 9:17 PM EDT	Special Weather Statement	PHI	Morris	28 min
Jul 13, 3:25 PM EDT	Special Weather Statement	PHI	Sussex	50 min
Jul 13, 3:28 PM EDT	Special Weather Statement	PHI	Middlesex	47 min
Jul 13, 3:58 PM EDT	Areal Flood Advisory	PHI	Sussex	4 hr
Jul 13, 4:06 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	114 min
Jul 13, 4:40 PM EDT	Special Weather Statement	PHI	Hunterdon, Middlesex, Somerset	50 min
Jul 13, 4:50 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Morris, Somerset	55 min
Jul 13, 4:50 PM EDT	Severe Thunderstorm Warning	PHI	Burlington	40 min
Jul 13, 4:58 PM EDT	Special Marine Warning	PHI		62 min
Jul 13, 5:07 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Mercer, Middlesex, Monmouth, Ocean	7 hr
Jul 13, 5:14 PM EDT	Special Weather Statement	PHI	Mercer	46 min
Jul 13, 5:21 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	54 min
Jul 13, 5:33 PM EDT	Special Marine Warning	PHI		87 min
Jul 13, 5:39 PM EDT	Special Weather Statement	PHI	Mercer	36 min
Jul 13, 6:07 PM EDT	Special Weather Statement	PHI	Atlantic	23 min
Jul 13, 6:07 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	25 min
Jul 13, 6:09 PM EDT	Special Marine Warning	PHI		66 min
Jul 13, 6:20 PM EDT	Special Weather Statement	PHI	Burlington	40 min
Jul 13, 6:28 PM EDT	Special Weather Statement	PHI	Mercer	47 min
Jul 13, 6:44 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Monmouth, Ocean	45 min
Jul 13, 6:55 PM EDT	Special Marine Warning	PHI		95 min
Jul 13, 7:00 PM EDT	Special Marine Warning	PHI		90 min
Jul 13, 7:12 PM EDT	Special Weather Statement	PHI	Camden	48 min
Jul 13, 7:55 PM EDT	Special Weather Statement	PHI	Ocean	35 min
Jul 13, 7:58 PM EDT	Special Weather Statement	PHI	Cumberland	32 min
Jul 13, 3:25 PM EDT	Areal Flood Advisory	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	4 hr
Jul 13, 3:30 PM EDT	Special Weather Statement	PHI	Lehigh, Northampton	45 min
Jul 13, 4:06 PM EDT	Special Weather Statement	PHI	Northampton	39 min
Jul 13, 4:08 PM EDT	Special Weather Statement	PHI	Schuylkill	37 min
Jul 13, 4:09 PM EDT	Special Weather Statement	PHI	Montgomery	36 min
Jul 13, 4:15 PM EDT	Severe Thunderstorm Warning	PHI	Berks	60 min
Jul 13, 4:34 PM EDT	Special Weather Statement	PHI	Chester	41 min
Jul 13, 4:36 PM EDT	Special Weather Statement	PHI	Lehigh	24 min
Jul 13, 4:42 PM EDT	Special Weather Statement	PHI	Montgomery, Philadelphia	48 min
Jul 13, 4:50 PM EDT	Areal Flood Advisory	PHI	Berks, Bucks, Chester, Montgomery	115 min
Jul 13, 5:08 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery	35 min
Jul 13, 5:08 PM EDT	Tornado Warning	PHI	Berks	22 min
Jul 13, 5:25 PM EDT	Flash Flood Warning	PHI	Berks, Lehigh	3 hr
Jul 13, 5:26 PM EDT	Tornado Warning	PHI	Berks, Chester, Montgomery	28 min
Jul 13, 5:30 PM EDT	Special Weather Statement	PHI	Delaware, Philadelphia	45 min
Jul 13, 5:36 PM EDT	Special Weather Statement	PHI	Montgomery	39 min
Jul 13, 5:44 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	46 min
Jul 13, 5:56 PM EDT	Special Weather Statement	PHI	Berks	34 min
Jul 13, 6:34 PM EDT	Special Weather Statement	PHI	Delaware, Montgomery, Philadelphia	41 min
Jul 13, 7:03 PM EDT	Areal Flood Advisory	PHI	Chester, Montgomery	117 min
Jul 13, 7:26 PM EDT	Special Weather Statement	PHI	Berks, Montgomery	64 min

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.