Alert archive / New Jersey / Flash Flood Warnings in 2017

Flash Flood Warning 8, NWS Philadelphia/Mount Holly

July 4, 2017Cumberland County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 4, 2017, 3:15 PM EDT for Cumberland County, New Jersey. 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: Jul 4, 2017, 3:15 PM EDT (19:15 UTC)
Expired: Jul 4, 2017, 7:15 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), 69 km from the middle of the area, began a volume at 19:15 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 4, 3:40 PM EDT	HEAVY RAIN 2.5	Millville, NJ
Jul 4, 3:45 PM EDT	HEAVY RAIN 2.53	1 Sse Carmel, NJ	MUCH OF THIS RAINFALL FELL WITHIN 45 MINUTES.
Jul 4, 4:30 PM EDT	HEAVY RAIN 2.76	1 Sse Carmel, NJ	MUCH OF THIS RAINFALL FELL WITHIN 45 MINUTES.

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, 7.3 hours before the alert went out and 165 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1899 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

341 
WGUS51 KPHI 041915
FFWPHI
NJC011-042315-
/O.NEW.KPHI.FF.W.0008.170704T1915Z-170704T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
315 PM EDT TUE JUL 4 2017

The National Weather Service in Mount Holly NJ has issued a

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

* Until 715 PM EDT

* At 314 PM EDT#...Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to two inches of rain have
  already fallen. Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Vineland, Millville, Bridgeton, Greenwich, Shiloh, Fairton, South
  Vineland and Rosenhayn.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3934 7502 3939 7534 3950 7531 3945 7501

$$

Iovino

2 follow-up statements

805 
WGUS71 KPHI 042029
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
429 PM EDT TUE JUL 4 2017

NJC011-042315-
/O.CON.KPHI.FF.W.0008.000000T0000Z-170704T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cumberland NJ-
429 PM EDT TUE JUL 4 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 715 PM EDT FOR
CENTRAL CUMBERLAND COUNTY...

At 428 PM EDT...Doppler radar indicated thunderstorms producing 
heavy rain across part of the warned area. While rainfall rates have 
decreased, up to two or three inches of rain have already fallen in 
a short period of time. Runoff from the heavy rain will continue to 
result in flooding.

Some locations that will experience flooding include...
Millville, Bridgeton, Greenwich, Shiloh and Fairton. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

&&

LAT...LON 3941 7502 3934 7502 3939 7534 3947 7532
      3942 7501

$$

Iovino

283 
WGUS71 KPHI 042146
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
546 PM EDT TUE JUL 4 2017

NJC011-042156-
/O.CAN.KPHI.FF.W.0008.000000T0000Z-170704T2315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cumberland NJ-
546 PM EDT TUE JUL 4 2017

...THE FLASH FLOOD WARNING FOR CENTRAL CUMBERLAND COUNTY IS
CANCELLED...

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

LAT...LON 3941 7502 3934 7502 3939 7534 3947 7532
      3942 7501

$$

Iovino

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 4, 2:07 PM EDT	Special Weather Statement	PHI	Cumberland	23 min
Jul 4, 2:23 PM EDT	Special Weather Statement	PHI	Cumberland	37 min
Jul 4, 2:44 PM EDT	Areal Flood Advisory	PHI	Cumberland	2 hr
Jul 4, 2:57 PM EDT	Special Weather Statement	PHI	Cumberland	33 min
Jul 4, 3:33 PM EDT	Special Weather Statement	PHI	Cumberland	57 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.