Alert archive / New Jersey / Flash Flood Warnings in 2018

Flash Flood Warning 79, NWS Philadelphia/Mount Holly

August 31, 2018Burlington County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 31, 2018, 5:36 AM EDT for Burlington County, New Jersey. It was in force for 3 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: Aug 31, 2018, 5:36 AM EDT (09:36 UTC)
Expired: Aug 31, 2018, 8:30 AM EDT
In force: 3 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Burlington County, NJ

The radar

The Philadelphia radar (KDIX), 28 km from the middle of the area, began a volume at 09:40 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
Aug 31, 7:00 AM EDT	FLASH FLOOD	2 W Pemberton, NJ	FLOODING ON NJ 38 EAST OF SOUTHAMPTON JUST EAST OF US 206.
Aug 31, 7:14 AM EDT	HEAVY RAIN 4.99	Eastampton Twp, NJ	4 INCHES OF RAIN FELL IN 90-MINUTE PERIOD ENDING 624 AM.
Aug 31, 7:39 AM EDT	HEAVY RAIN 5.58	2 Sse Eastampton Twp, NJ	5.06 INCHES OF RAIN FELL IN 2-HR PERIOD ENDING 7 AM.

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, 9.6 hours before the alert went out and 186 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: 10 J/kg
Mixed-layer CIN: -146 J/kg
Mixed-layer LCL: 1562 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -59 m²/s²
0-3 km storm-relative helicity: 17 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

475 
WGUS51 KPHI 310936
FFWPHI
NJC005-311230-
/O.NEW.KPHI.FF.W.0079.180831T0936Z-180831T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
536 AM EDT FRI AUG 31 2018

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  Central Burlington County in southern New Jersey...

* Until 830 AM EDT.

* At 534 AM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Up to two and a half inches of 
  rain have already fallen. Another inch could occur over the next 
  few hours. Flash flooding is expected to begin shortly in the 
  areas of heaviest rain.

* Flash flooding will affect the Eastampton area of central 
  Burlington County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3995 7474 3999 7478 4002 7473 4000 7469

$$

po

1 follow-up statement

069 
WGUS71 KPHI 311226
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
826 AM EDT FRI AUG 31 2018

NJC005-311236-
/O.EXP.KPHI.FF.W.0079.000000T0000Z-180831T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-
826 AM EDT FRI AUG 31 2018

...THE FLASH FLOOD WARNING FOR CENTRAL BURLINGTON COUNTY WILL EXPIRE
AT 830 AM EDT...

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

LAT...LON 3995 7474 3999 7478 4002 7473 4000 7469

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 31, 5:17 AM EDT	Areal Flood Advisory	PHI	Burlington	3 hr
Aug 31, 6:27 AM EDT	Flash Flood Warning	PHI	Burlington	3 hr
Aug 31, 6:37 AM EDT	Severe Thunderstorm Warning	PHI	Burlington, Ocean	53 min
Aug 31, 7:34 AM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden	2 hr
Aug 31, 9:29 AM EDT	Areal Flood Advisory	PHI	Burlington	119 min
Aug 31, 12:47 PM EDT	Special Marine Warning	PHI		118 min
Aug 31, 1:22 PM EDT	Areal Flood Advisory	PHI	Morris, Sussex, Warren	4 hr
Aug 31, 4:30 PM EDT	Special Marine Warning	PHI		90 min

Nearby

Flash Flood Warnings in New Jersey, 2018 Every flash flood warning in 2018

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.