Alert archive / New Jersey / Flash Flood Warnings in 2017

Flash Flood Warning 45, NWS Philadelphia/Mount Holly

August 7, 2017Cumberland County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 7, 2017, 1:23 PM EDT for Cumberland County, New Jersey. It was in force for 4 hr. 8 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 7, 2017, 1:23 PM EDT (17:23 UTC)
Expired: Aug 7, 2017, 5:15 PM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Cumberland County, NJ

The radar

The Dover AFB radar (KDOX), 56 km from the middle of the area, began a volume at 17:26 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 7, 2:00 PM EDT	FLOOD	Millville, NJ	FLOODING REPORTED ON SEVERAL NEIGHBORHOOD ROADS AROUND MILLVILLE. TIME ESTIMATED.
Aug 7, 2:00 PM EDT	HEAVY RAIN 2.75	Newport, NJ
Aug 7, 2:25 PM EDT	HEAVY RAIN 3.03	Fortescue, NJ
Aug 7, 2:33 PM EDT	HEAVY RAIN 2.51	Roosevelt Park, NJ
Aug 7, 2:35 PM EDT	HEAVY RAIN 3.73	2 Sse Hopewell Twp, NJ
Aug 7, 2:35 PM EDT	HEAVY RAIN 4.57	1 Sse Carmel, NJ
Aug 7, 4:56 PM EDT	HEAVY RAIN 3.85	Newport, NJ
Aug 7, 4:56 PM EDT	HEAVY RAIN 4.85	Newport, NJ

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 5.4 hours before the alert went out and 150 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: 57 J/kg
Mixed-layer CIN: -91 J/kg
Mixed-layer LCL: 996 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 176 m²/s²
0-3 km storm-relative helicity: 193 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

As transmitted.

744 
WGUS51 KPHI 071723
FFWPHI
NJC011-072115-
/O.NEW.KPHI.FF.W.0045.170807T1723Z-170807T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
123 PM EDT MON AUG 7 2017

The National Weather Service in Mount Holly NJ has issued a

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

* Until 515 PM EDT

* At 121 PM EDT...Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to three inches of rain have
  already fallen. Flash flooding is expected to begin shortly in the
  areas of heaviest rain.

* Some locations that could experience flooding include...
  Vineland, Millville, Bridgeton, Laurel Lake, Greenwich, Newport,
  Mauricetown, Leesburg, Port Norris, Dividing Creek, Fairton,
  Bricksboro, Cedarville, Port Elizabeth, Bivalve, Fortesque and
  South Vineland.

Additional rainfall amounts of one to three inches are possible in 
the warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Please report flooding to your local law enforcement agency when you
can do so safely.

&&

LAT...LON 3917 7499 3919 7509 3916 7515 3928 7533
      3939 7542 3947 7503 3925 7490

$$

MWG

2 follow-up statements

961 
WGUS71 KPHI 071858
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
258 PM EDT MON AUG 7 2017

NJC011-072115-
/O.CON.KPHI.FF.W.0045.000000T0000Z-170807T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cumberland NJ-
258 PM EDT MON AUG 7 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 PM EDT FOR
CENTRAL CUMBERLAND COUNTY...

At 256 PM EDT...Doppler radar indicated thunderstorms producing 
heavy rain across the warned area. Up to six inches of rain has 
already fallen. An additional one to three inches is expected in 
central and eastern Cumberland county. Flash flooding is expected to 
begin shortly and flooding is already occuring in Millville. 

Some locations that could experience flooding include...
Vineland, Millville, Bridgeton, Laurel Lake, Greenwich, Newport,
Mauricetown, Leesburg, Port Norris, Dividing Creek, Fairton,
Bricksboro, Cedarville, Port Elizabeth, Bivalve, Fortesque and South
Vineland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Please report flooding to your local law enforcement agency when you
can do so safely.

&&

LAT...LON 3917 7499 3919 7509 3916 7515 3928 7533
      3939 7542 3947 7503 3925 7490

$$

MWG

053 
WGUS71 KPHI 072107
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
507 PM EDT MON AUG 7 2017

NJC011-072115-
/O.EXP.KPHI.FF.W.0045.000000T0000Z-170807T2115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cumberland NJ-
507 PM EDT MON AUG 7 2017

...THE FLASH FLOOD WARNING FOR CENTRAL CUMBERLAND COUNTY WILL EXPIRE
AT 515 PM EDT...

The heavy rain has ended along with the risk for flash flooding. 
However, flooding issues are ongoing across central and eastern 
portions of Cumberland county and a flood warning remains in effect 
into the evening. Please continue to heed any remaining road 
closures.

LAT...LON 3917 7499 3919 7509 3916 7515 3928 7533
      3939 7542 3947 7503 3925 7490

$$

MWG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 7, 9:59 AM EDT	Areal Flood Advisory	PHI	Cumberland, Salem	3 hr
Aug 7, 12:36 PM EDT	Areal Flood Advisory	PHI	Atlantic, Cape May, Cumberland, Salem	4 hr
Aug 7, 2:04 PM EDT	Special Marine Warning	PHI		56 min
Aug 7, 2:53 PM EDT	Special Marine Warning	PHI		67 min
Aug 7, 3:25 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Ocean	4 hr
Aug 7, 3:57 PM EDT	Special Marine Warning	PHI		63 min
Aug 7, 4:24 PM EDT	Areal Flood Warning	PHI	Atlantic, Burlington, Cape May, Cumberland, Gloucester, Ocean	4 hr
Aug 7, 4:59 PM EDT	Special Marine Warning	PHI		91 min

Nearby

Flash Flood Warnings in New Jersey, 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.