Alert archive / New Jersey / Flash Flood Warnings in 2019

Flash Flood Warning 14, NWS Philadelphia/Mount Holly

May 30, 2019Morris County, Somerset County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at May 30, 2019, 6:53 PM EDT for Morris County, Somerset County, New Jersey. It was in force for 4 hr. 2 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
May 30, 2019, 6:53 PM EDT (22:53 UTC)
Expired
May 30, 2019, 11:00 PM EDT
In force
4 hr
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Flood severity
None

Counties Morris County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 104 km from the middle of the area, began a volume at 22:55 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

TimeReportWhereRemark
May 30, 7:00 PM EDTFLOOD2 Nne Basking Ridge, NJFLOODING ON INTERSTATE 287 NORTHBOUND NEAR EXIT 30. LANE RESTRICTIONS IN PLACE.
May 30, 7:36 PM EDTFLOOD1 E Madison, NJSTATE HIGHWAY 24 NEAR EXIT 7 FLOODED WITH LANE RESTRICTIONS IN PLACE.

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 12:00Z, 10.9 hours before the alert went out and 140 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-pSkew-T log-p diagram, Brookhaven, NY at 12:00Z on 2019-05-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2019-05-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -63 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
546 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
-63 m²/s²
0-3 km storm-relative helicity
77 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

885 
WGUS51 KPHI 302253
FFWPHI
NJC027-035-310300-
/O.NEW.KPHI.FF.W.0014.190530T2253Z-190531T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
653 PM EDT Thu May 30 2019

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  Morris County in northern New Jersey...
  North central Somerset County in northern New Jersey...

* Until 1100 PM EDT.

* At 652 PM EDT, Doppler radar indicated heavy rain across the warned
  area. Up to two 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...
  Morristown, Dover, Madison, Hopatcong, Florham Park, East Hanover,
  Lincoln Park, Kinnelon, Hackettstown, Chatham, Boonton, Butler,
  Wharton, Rockaway, Morris Plains, Mount Arlington, Mendham,
  Mountain Lakes, Stanhope and Riverdale.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4090 7427 4091 7433 4086 7432 4079 7437
      4075 7436 4068 7446 4081 7485 4086 7480
      4088 7481 4091 7476 4092 7473 4090 7471
      4092 7465 4095 7464 4102 7440 4100 7430

$$

SFJ
1 follow-up statement
932 
WGUS71 KPHI 310038
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
838 PM EDT Thu May 30 2019

NJC027-035-310300-
/O.CON.KPHI.FF.W.0014.000000T0000Z-190531T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Morris NJ-Somerset NJ-
838 PM EDT Thu May 30 2019

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1100 PM EDT FOR
MORRIS AND NORTH CENTRAL SOMERSET COUNTIES...

At 835 PM EDT, transportation officials reported flash flooding in a 
few locations across Morris County. Up to two inches of rain have 
already fallen. The heaviest rain has left the warned area. However, 
additional rain is possible with showers late this evening, and it 
will take time for the water to recede.

Some locations that could experience flooding include...
Morristown, Dover, Madison, Hopatcong, Florham Park, East Hanover,
Lincoln Park, Kinnelon, Hackettstown, Chatham, Boonton, Butler,
Wharton, Rockaway, Morris Plains, Mount Arlington, Mendham, Mountain
Lakes, Stanhope and Riverdale.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 4090 7427 4091 7433 4086 7432 4079 7437
      4075 7436 4068 7446 4081 7485 4086 7480
      4088 7481 4091 7476 4092 7473 4090 7471
      4092 7465 4095 7464 4102 7440 4100 7430

$$

SFJ

The office that day

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

IssuedProductOfficeCountiesLasted
May 29, 8:00 PM EDTSpecial Marine WarningPHI60 min
May 29, 8:02 PM EDTAreal Flood AdvisoryPHIAtlantic, Burlington, Cape May, Ocean107 min
May 29, 8:35 PM EDTSpecial Marine WarningPHI85 min
May 30, 3:20 AM EDTFlash Flood WatchPHIBurlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 7 more18 hr
May 30, 3:33 AM EDTDense Fog AdvisoryPHIBurlington, Mercer4 hr
May 30, 4:17 PM EDTAreal Flood AdvisoryPHISussex, Warren4 hr
May 30, 4:19 PM EDTAreal Flood AdvisoryPHIBurlington, Camden, Gloucester4 hr
May 30, 4:25 PM EDTSpecial Weather StatementPHIWarren35 min
May 30, 4:36 PM EDTSevere Thunderstorm WarningPHIBurlington, Mercer, Monmouth, Ocean39 min
May 30, 4:40 PM EDTSevere Thunderstorm WarningPHIHunterdon, Morris, Warren50 min
May 30, 4:46 PM EDTSpecial Weather StatementPHISalem29 min
May 30, 4:48 PM EDTSevere Thunderstorm WarningPHIHunterdon, Warren42 min
May 30, 4:49 PM EDTFlash Flood WarningPHIWarren4 hr
May 30, 4:57 PM EDTAreal Flood AdvisoryPHIBurlington, Hunterdon, Mercer, Middlesex, Monmouth, Ocean and 1 more4 hr
May 30, 4:58 PM EDTSpecial Marine WarningPHI62 min
May 30, 5:03 PM EDTAreal Flood AdvisoryPHIHunterdon, Morris, Somerset, Warren4 hr
May 30, 5:14 PM EDTSpecial Weather StatementPHISalem31 min
May 30, 5:17 PM EDTFlash Flood WarningPHIBurlington, Camden, Mercer, Monmouth4 hr
May 30, 5:20 PM EDTSevere Thunderstorm WarningPHIHunterdon, Middlesex, Morris, Somerset, Warren40 min
May 30, 5:22 PM EDTAreal Flood AdvisoryPHICape May, Cumberland, Gloucester, Salem2 hr
May 30, 5:23 PM EDTSpecial Weather StatementPHIMercer37 min
May 30, 5:32 PM EDTSevere Thunderstorm WarningPHICape May43 min
May 30, 5:33 PM EDTSpecial Marine WarningPHI27 min
May 30, 5:55 PM EDTSpecial Marine WarningPHI65 min
May 30, 5:55 PM EDTSevere Thunderstorm WarningPHIHunterdon, Middlesex, Morris, Somerset31 min
May 30, 6:06 PM EDTFlash Flood WarningPHIHunterdon, Middlesex, Morris, Somerset4 hr
May 30, 7:35 PM EDTSpecial Weather StatementPHIMercer25 min
May 30, 7:56 PM EDTSpecial Weather StatementPHIMercer34 min

Nearby

Flash Flood Warnings in New Jersey, 2019Every flash flood warning in 2019

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.