Alert archive / New Jersey / Flash Flood Warnings in 2015

Flash Flood Warning 6, NWS Philadelphia/Mount Holly

May 31, 2015Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at May 31, 2015, 8:13 PM EDT for Somerset County, New Jersey. It was in force for 5 hr. 1 report 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: May 31, 2015, 8:13 PM EDT (00:13 UTC)
Expired: Jun 1, 2015, 1:15 AM EDT
In force: 5 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 76 km from the middle of the area, began a volume at 00:15 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
May 31, 8:45 PM EDT	FLASH FLOOD	North Plainfield, NJ	CARS STUCK IN HIGH WATER ON ROUTE 22

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, 0.2 hours before the alert went out and 145 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: 168 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 686 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 62 m²/s²
0-3 km storm-relative helicity: 7 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

034 
WGUS51 KPHI 010013
FFWPHI
NJC035-010515-
/O.NEW.KPHI.FF.W.0006.150601T0013Z-150601T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
813 PM EDT SUN MAY 31 2015

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOMERSET COUNTY IN NORTHERN NEW JERSEY...

* UNTIL 115 AM EDT
    
* AT 812 PM EDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. UP TO THREE INCHES OF RAIN HAVE 
  ALREADY FALLEN IN THE CENTRAL PART OF THE COUNTY. FLASH FLOODING 
  IS EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... 
  SOMERVILLE...SOMERSET...BRIDGEWATER...MIDDLESEX... 
  BOUND BROOK...MANVILLE...MENDHAM...PEAPACK AND GLADSTONE...FAR 
  HILLS...MILLSTONE...BASKING 
  RIDGE...FLAGTOWN...MARTINSVILLE...NORTH 
  PLAINFIELD...BERNARDSVILLE...RARITAN...WATCHUNG AND SOUTH BOUND 
  BROOK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

&&

LAT...LON 4063 7442 4057 7453 4050 7446 4045 7452
      4051 7477 4058 7471 4062 7471 4064 7473
      4073 7471 4076 7456 4070 7451 4068 7453
      4065 7452 4067 7448 4066 7445 4066 7440

$$

1 follow-up statement

310 
WGUS71 KPHI 010303
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1103 PM EDT SUN MAY 31 2015

NJC035-010515-
/O.CON.KPHI.FF.W.0006.000000T0000Z-150601T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SOMERSET NJ-
1103 PM EDT SUN MAY 31 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 115 AM EDT FOR
NORTHEASTERN SOMERSET COUNTY...

AT 1059 PM EDT...DOPPLER RADAR INDICATED CLUSTERS OF SHOWERS AND  
THUNDERSTORMS PRODUCING HEAVY RAIN ACROSS PORTIONS OF THE WARNED 
AREA AS WELL AS UPSTREAM BACK INTO SOUTHEAST PENNSYLVANIA.  IF THESE 
ORGANIZE INTO A BAND THAT REPEATEDLY DEPOSITS HEAVY RAIN OVER THE 
SAME AREA, THEN FLASH FLOODING COULD REOCCUR.

SHOWERS AND ISOLATED THUNDERSTORMS WILL PROBABLY CONTINUE THROUGH 
EARLY MONDAY MORNING.  


PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 4063 7442 4059 7455 4058 7471 4067 7470
      4073 7471 4073 7454 4068 7453 4065 7452
      4067 7448 4066 7445 4066 7440

$$

DRAG

The office that day

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

Issued	Product	Office	Counties	Lasted
May 31, 8:43 PM EDT	Special Weather Statement	PHI	Hunterdon	62 min
May 31, 9:06 PM EDT	Flash Flood Warning	PHI	Hunterdon	5 hr
Jun 1, 1:57 AM EDT	Areal Flood Advisory	PHI	Hunterdon, Middlesex, Morris, Somerset, Warren	3 hr
Jun 1, 2:17 AM EDT	Special Weather Statement	PHI	Camden, Gloucester, Mercer, Salem	43 min
Jun 1, 2:55 AM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Mercer	2 hr
Jun 1, 3:20 AM EDT	Areal Flood Advisory	PHI	Mercer, Middlesex, Monmouth, Somerset	115 min
Jun 1, 3:35 AM EDT	Special Weather Statement	PHI	Atlantic, Monmouth, Ocean	25 min
Jun 1, 4:20 AM EDT	Flash Flood Watch	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 8 more	26 hr
Jun 1, 5:56 AM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester	3 hr
Jun 1, 10:05 AM EDT	Areal Flood Advisory	PHI	Middlesex, Somerset	4 hr
Jun 1, 10:11 AM EDT	Small Craft Advisory	PHI		4 days
Jun 1, 2:28 PM EDT	Special Weather Statement	PHI	Burlington, Camden, Cumberland, Gloucester, Salem	32 min
Jun 1, 3:04 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester	56 min
Jun 1, 3:29 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington	46 min
Jun 1, 3:42 PM EDT	Flash Flood Warning	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Salem	6 hr
Jun 1, 3:56 PM EDT	Special Weather Statement	PHI	Atlantic, Cape May	79 min
Jun 1, 4:26 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Cape May, Ocean	3 hr
Jun 1, 4:32 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Gloucester, Salem	43 min
Jun 1, 4:37 PM EDT	Tornado Warning	PHI	Salem	23 min
Jun 1, 5:27 PM EDT	Areal Flood Advisory	PHI	Cumberland, Gloucester, Salem	3 hr
Jun 1, 5:34 PM EDT	Areal Flood Advisory	PHI	Cape May	3 hr
Jun 1, 7:18 PM EDT	Flash Flood Warning	PHI	Cumberland	3 hr
Jun 1, 7:26 PM EDT	Special Marine Warning	PHI		34 min
Jun 1, 7:54 PM EDT	Special Weather Statement	PHI	Atlantic, Cape May	111 min

Nearby

Flash Flood Warnings in New Jersey, 2015 Every flash flood warning in 2015

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.