Alert archive / New Jersey / Flash Flood Warnings in 2016

Flash Flood Warning 27, NWS Philadelphia/Mount Holly

July 30, 2016Mercer County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 30, 2016, 6:26 PM EDT for Mercer County, New Jersey. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 30, 2016, 6:26 PM EDT (22:26 UTC)
Expired: Jul 30, 2016, 10:15 PM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Emergency: Flash flood emergency
Flood severity: None

County Mercer County, NJ

The radar

The Philadelphia radar (KDIX), 46 km from the middle of the area, began a volume at 22:26 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.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 10.4 hours before the alert went out and 162 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: 176 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 858 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: -7 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.

535 
WGUS51 KPHI 302226
FFWPHI
NJC021-310215-
/O.NEW.KPHI.FF.W.0027.160730T2226Z-160731T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
626 PM EDT SAT JUL 30 2016

...FLASH FLOOD EMERGENCY FOR PRINCETON AND WEST WINDSOR
TOWNSHIPS...

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN MERCER COUNTY IN CENTRAL NEW JERSEY...

* UNTIL 1015 PM EDT
    
* AT 621 PM EDT...IT WAS STILL RAINING ACROSS THE WARNED AREA.
  CREEKS ARE RUNNING HIGH, ROADS HAVE BEEN CLOSED, AND WATER RESCUES
  HAVE BEEN CONDUCTED. THE DELAWARE AND RARITAN CANAL HAS LEFT IT'S
  BANKS AND IS FLOODING PORTIONS OF PRINCETON, ESPECIALLY NEAR
  CANAL POINTE BOULEVARD. UP TO SIX INCHES OF RAIN HAVE FALLEN THE
  LAST FEW HOURS. THE WORST FLOODING HAS BEEN ALONG THE ROUTE ONE
  CORRIDOR FROM PRINCETON TO PLAINSBORO. THIS IS A DANGEROUS
  SITUATION. DO NOT GO AROUND ROAD BARRIERS. MOVE TO HIGHER GROUND.
  
  THIS IS A FLASH FLOOD EMERGENCY FOR PRINCETON AND WEST WINDSOR
  TOWNSHIPS.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  PRINCETON AND PRINCETON JUNCTION. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. THIS IS AN EXTREMELY DANGEROUS AND LIFE
THREATENING SITUATION. DO NOT ATTEMPT TO TRAVEL UNLESS YOU ARE
FLEEING AN AREA SUBJECT TO FLOODING OR UNDER AN EVACUATION ORDER.

STAY AWAY OR BE SWEPT AWAY. RIVER BANKS AND CULVERTS CAN BECOME
UNSTABLE AND UNSAFE.

&&

LAT...LON 4031 7460 4029 7466 4032 7470 4035 7465

$$

KRUZDLO

1 follow-up statement

327 
WGUS71 KPHI 310222
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1022 PM EDT SAT JUL 30 2016

NJC021-310230-
/O.EXP.KPHI.FF.W.0027.000000T0000Z-160731T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MERCER NJ-
1022 PM EDT SAT JUL 30 2016

...THE FLASH FLOOD WARNING FOR NORTHEASTERN MERCER COUNTY HAS
EXPIRED...

WATER IS NO LONGER RISING RAPIDLY. THE FLASH FLOOD WARNING HAS BEEN
REPLACED BY A FLOOD WARNING WHICH IS IN EFFECT UNTIL 215 AM. 

LAT...LON 4031 7460 4029 7466 4032 7470 4035 7465

$$

KRUZDLO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 1:55 PM EDT	Special Weather Statement	PHI	Hunterdon	50 min
Jul 30, 2:34 PM EDT	Areal Flood Advisory	PHI	Middlesex, Monmouth	4 hr
Jul 30, 2:40 PM EDT	Special Weather Statement	PHI	Morris	35 min
Jul 30, 2:59 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Warren	4 hr
Jul 30, 3:03 PM EDT	Severe Thunderstorm Warning	PHI	Morris	47 min
Jul 30, 3:06 PM EDT	Areal Flood Advisory	PHI	Mercer, Middlesex, Somerset	4 hr
Jul 30, 3:34 PM EDT	Areal Flood Advisory	PHI	Mercer, Middlesex	4 hr
Jul 30, 3:45 PM EDT	Areal Flood Advisory	PHI	Morris, Sussex	4 hr
Jul 30, 3:49 PM EDT	Special Weather Statement	PHI	Mercer, Middlesex	26 min
Jul 30, 3:58 PM EDT	Flash Flood Warning	PHI	Mercer, Middlesex, Somerset	7 hr
Jul 30, 4:37 PM EDT	Flash Flood Warning	PHI	Middlesex	6 hr

Nearby

Flash Flood Warnings in New Jersey, 2016 Every flash flood warning in 2016

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.