Alert archive / New Jersey / Flash Flood Warnings in 2015

Flash Flood Warning 7, NWS Philadelphia/Mount Holly

May 31, 2015Hunterdon County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at May 31, 2015, 9:06 PM EDT for Hunterdon 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, 9:06 PM EDT (01:06 UTC)
Expired: Jun 1, 2015, 2:00 AM EDT
In force: 5 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Hunterdon County, NJ

The radar

The Philadelphia radar (KDIX), 82 km from the middle of the area, began a volume at 01:06 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, 9:28 PM EDT	FLASH FLOOD	Clinton, NJ	2 CARS STALLED WITH UP TO ONE FOOT OF WATER OVER SOME ROADS. REPORT RELAYED THROUGH SPOTTER NETWORK

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, 1.1 hours before the alert went out and 175 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.

996 
WGUS51 KPHI 010106
FFWPHI
NJC019-010600-
/O.NEW.KPHI.FF.W.0007.150601T0106Z-150601T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  HUNTERDON COUNTY IN NORTHWESTERN NEW JERSEY...

* UNTIL 200 AM EDT
    
* AT 905 PM EDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING
  HEAVY RAIN ACROSS THE WARNED AREA. OTHER THUNDERSTORMS WITH
  VERY HEAVY RAIN ARE ABOUT TO ENTER THE COUNTY.
  FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  FLEMINGTON...HIGH BRIDGE...CLINTON...GLEN GARDNER...HAMPTON...
  FRENCHTOWN...LEBANON...MILFORD...CALIFON...WHITE HOUSE STATION...
  SAND BROOK...SERGEANTSVILLE AND ANNANDALE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.
NEVER DRIVE THROUGH FLOODED WATERS.

&&

LAT...LON 4052 7477 4051 7480 4049 7479 4040 7502
      4045 7507 4054 7507 4058 7512 4057 7519
      4059 7519 4069 7500 4079 7488 4074 7483
      4072 7472 4064 7473 4063 7471 4058 7471

$$

2 follow-up statements

145 
WGUS71 KPHI 010255
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1055 PM EDT SUN MAY 31 2015

NJC019-010600-
/O.CON.KPHI.FF.W.0007.000000T0000Z-150601T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HUNTERDON NJ-
1055 PM EDT SUN MAY 31 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 200 AM EDT FOR
HUNTERDON COUNTY...

AT 1052 PM EDT...DOPPLER RADAR INDICATED CLUSTERS OF THUNDERSTORMS 
PRODUCING HEAVY RAIN ACROSS THE WARNED AREA AND ALSO UPSTREAM. IF 
THESE STORMS BECOME ORGANIZED AND REPEATEDLY PASS OVER THE SAME 
AREA,  FLASH FLOODING WOULD OCCUR. THE THREAT FOR FLOODING 
CONTINUES. 

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 4051 7482 4049 7486 4040 7502 4045 7507
      4054 7507 4058 7508 4065 7499 4075 7486
      4074 7483 4072 7472 4064 7473 4063 7471
      4058 7471

$$

DRAG

798 
WGUS71 KPHI 010552
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
152 AM EDT MON JUN 1 2015

NJC019-010601-
/O.EXP.KPHI.FF.W.0007.000000T0000Z-150601T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HUNTERDON NJ-
152 AM EDT MON JUN 1 2015

...THE FLASH FLOOD WARNING FOR HUNTERDON COUNTY WILL EXPIRE AT 200 AM
EDT...

THE HEAVY RAIN HAS ENDED...AND MAJOR FLOODING IS NO LONGER EXPECTED 
TO POSE A THREAT. HOWEVER...LIGHT RAIN WILL BE POSSIBLE OVER THE 
NEXT FEW HOURS. THEREFORE A FLOOD ADVISORY REMAINS IN EFFECT.

LAT...LON 4051 7482 4049 7486 4040 7502 4045 7507
      4054 7507 4058 7508 4065 7499 4075 7486
      4074 7483 4072 7472 4064 7473 4063 7471
      4058 7471

$$

SFJ

The office that day

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

Issued	Product	Office	Counties	Lasted
May 31, 8:13 PM EDT	Flash Flood Warning	PHI	Somerset	5 hr
May 31, 8:43 PM EDT	Special Weather Statement	PHI	Hunterdon	62 min
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.