Alert archive / New Jersey / Flash Flood Warnings in 2013

Flash Flood Warning 1, NWS Philadelphia/Mount Holly

May 23, 2013Morris County, New Jersey

NWS Philadelphia/Mount Holly issued this flash flood warning at May 23, 2013, 5:36 PM EDT for Morris County, New Jersey. It was in force for 114 min. 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 23, 2013, 5:36 PM EDT (21:36 UTC)
Expired: May 23, 2013, 7:30 PM EDT
In force: 114 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

County Morris County, NJ

The radar

The Philadelphia radar (KDIX), 98 km from the middle of the area, began a volume at 21:36 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 23, 6:45 PM EDT	FLOOD	Parsippany, NJ	FLOODING ON SOME STREETS AND IN POOR DRAINAGE AREAS IN THE EASTERN PART OF THE COUNTY. SOME ROADS COVERED BY WATER.

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, 9.6 hours before the alert went out and 133 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: 98 J/kg
Mixed-layer CIN: -149 J/kg
Mixed-layer LCL: 599 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 129 m²/s²
0-3 km storm-relative helicity: 114 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.

705 
WGUS51 KPHI 232136
FFWPHI
NJC027-232330-
/O.NEW.KPHI.FF.W.0001.130523T2136Z-130523T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
536 PM EDT THU MAY 23 2013

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  MORRIS COUNTY...

* UNTIL 730 PM EDT...

* AT 530 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
ADDITIONAL SHOWERS AND THUNDERSTORMS MOVING THROUGH THE AREA. 
RAINFALL AMOUNTS SO FAR ARE LOCALLY UP TO 2 INCHES, SOME OF WHICH 
OCCURRED IN A SHORT PERIOD OF TIME. ADDITIONAL RAINFALL WILL ADD TO 
RUNOFF ALREADY IN PROGRESS, WITH AREAS OF FLOODING EXPECTED.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL 
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

DO NOT UNDERESTIMATE THE POWER OF FLOOD WATERS. ONLY A FEW INCHES OF
RAPIDLY FLOWING WATER CAN QUICKLY CARRY AWAY YOUR VEHICLE.

&&

LAT...LON 4090 7433 4084 7432 4079 7436 4075 7436
      4065 7451 4065 7452 4068 7453 4070 7451
      4076 7455 4072 7473 4077 7486 4104 7444
      4102 7443 4100 7430 4097 7428 4093 7429
      4090 7427

$$

FORECASTER: GORSE

1 follow-up statement

189 
WGUS71 KPHI 232324
FFSPHI

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
724 PM EDT THU MAY 23 2013

NJC027-232332-
/O.EXP.KPHI.FF.W.0001.000000T0000Z-130523T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MORRIS NJ-
724 PM EDT THU MAY 23 2013

...THE FLASH FLOOD WARNING WILL EXPIRE AT 730 PM EDT FOR MORRIS
COUNTY...

THE RAINFALL INTENSITY HAS DECREASED, AND COUNTY OFFICIALS REPORTED 
AREAS OF ROADWAY FLOODING AND ALSO FLOODING IN AREAS OF POOR 
DRAINAGE HAS OCCURRED. SINCE THERE NO LONGER APPEARS TO BE A THREAT 
TO LIFE OR PROPERTY, THE FLASH FLOOD WARNING WILL BE ALLOWED TO 
EXPIRE.

LAT...LON 4090 7433 4084 7432 4079 7436 4075 7436
      4065 7451 4065 7452 4068 7453 4070 7451
      4076 7455 4072 7473 4077 7486 4104 7444
      4102 7443 4100 7430 4097 7428 4093 7429
      4090 7427

$$

FORECASTER: GORSE

The office that day

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

Issued	Product	Office	Counties	Lasted
May 22, 10:53 PM EDT	Special Weather Statement	PHI	Warren	97 min
May 23, 2:14 AM EDT	Special Weather Statement	PHI	Monmouth, Ocean	61 min
May 23, 1:00 PM EDT	Areal Flood Advisory	PHI	Morris, Sussex, Warren	3 hr
May 23, 2:23 PM EDT	Special Weather Statement	PHI	Camden	37 min
May 23, 2:31 PM EDT	Areal Flood Advisory	PHI	Sussex, Warren	3 hr
May 23, 3:03 PM EDT	Special Weather Statement	PHI	Sussex, Warren	42 min
May 23, 4:28 PM EDT	Areal Flood Warning	PHI	Morris	3 hr
May 23, 4:47 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Somerset	3 hr
May 23, 7:34 PM EDT	Areal Flood Warning	PHI	Morris	13 hr

Nearby

Flash Flood Warnings in New Jersey, 2013 Every flash flood warning in 2013

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.