Alert archive / New Jersey / Areal Flood Warnings in 2021

Areal Flood Warning 59, NWS Philadelphia/Mount Holly

October 26, 20214 counties in New Jersey

NWS Philadelphia/Mount Holly issued this areal flood warning at Oct 26, 2021, 8:07 AM EDT for 4 counties in New Jersey. It was in force for 12 hr. 9 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: Oct 26, 2021, 8:07 AM EDT (12:07 UTC)
Expired: Oct 26, 2021, 8:00 PM EDT
In force: 12 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Hunterdon County, NJ, Middlesex County, NJ, Morris County, NJ, Somerset County, NJ

The radar

The Philadelphia radar (KDIX), 88 km from the middle of the area, began a volume at 12:08 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
Oct 26, 8:10 AM EDT	FLASH FLOOD	1 Ne Morristown, NJ	THE GAUGE ON THE WHIPPANY RIVER IN MORRISTOWN (WHIN4) REACHED FLOOD STAGE.
Oct 26, 8:40 AM EDT	HEAVY RAIN 4.06	Butler, NJ
Oct 26, 9:36 AM EDT	HEAVY RAIN 3.52	South Plainfield, NJ
Oct 26, 11:15 AM EDT	HEAVY RAIN 3.05	Edison, NJ
Oct 26, 12:00 PM EDT	HEAVY RAIN 4.86	1 Nw Chatham, NJ	REPORT VIA SOCIAL MEDIA.
Oct 26, 12:30 PM EDT	HEAVY RAIN 3.67	Watchung, NJ
Oct 26, 1:15 PM EDT	HEAVY RAIN 3.8	Montville, NJ
Oct 26, 3:35 PM EDT	HEAVY RAIN 5	Metuchen, NJ
Oct 26, 3:45 PM EDT	HEAVY RAIN 4.18	1 Nw Chatham, NJ	REPORT VIA SOCIAL MEDIA.

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, 0.1 hours before the alert went out and 134 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: 14 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 472 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 257 m²/s²
0-3 km storm-relative helicity: 349 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

582 
WGUS41 KPHI 261207
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
807 AM EDT Tue Oct 26 2021

NJC019-023-027-035-262000-
/O.NEW.KPHI.FA.W.0059.211026T1207Z-211026T2000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Middlesex NJ-Morris NJ-Somerset NJ-
807 AM EDT Tue Oct 26 2021

The National Weather Service in Mount Holly has issued a

* Flood Warning for...
  Northern Middlesex County in northern New Jersey...
  Morris County in northern New Jersey...
  Somerset County in northern New Jersey...
  East Central Hunterdon County in northwestern New Jersey...

* Until 400 PM EDT Tuesday.

* At 807 AM EDT, local law enforcement reported flooding in the 
  warned area.  Several roads are closed in Somerset and 
  northwestern Middlesex Counties, and several stream gauges are in 
  flood or are approaching flood in the warning area. Between 2 and 
  5 inches of rain have fallen. Flooding will continue for the next 
  several hours. This warning replaces the flash flood warning 
  previously in effect for the area.

* Some locations that may experience flooding include...
  New Brunswick, Morristown, Somerville, Somerset, Edison, East 
  Brunswick, Bridgewater, South Brunswick, North Brunswick, Dover, 
  Madison, and Middlesex.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4072 7474 4105 7444 4102 7443 4100 7430
      4093 7429 4091 7427 4091 7433 4087 7434
      4086 7432 4076 7438 4075 7436 4067 7446
      4066 7445 4066 7440 4062 7443 4060 7446
      4060 7421 4037 7458 4039 7466 4046 7475

$$

CMS

1 follow-up statement

538 
WGUS41 KPHI 261833 RRB
FLWPHI

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
233 PM EDT Tue Oct 26 2021

NJC019-023-027-035-270000-
/O.EXT.KPHI.FA.W.0059.000000T0000Z-211027T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hunterdon NJ-Middlesex NJ-Morris NJ-Somerset NJ-
233 PM EDT Tue Oct 26 2021

The National Weather Service in Mount Holly has extended the

* Flood Warning for...
  Northern Middlesex County in northern New Jersey...
  Morris County in northern New Jersey...
  Somerset County in northern New Jersey...
  East Central Hunterdon County in northwestern New Jersey...

* Until 800 PM EDT.

* At 233 PM EDT, Flooding continues on several local roads, creeks, 
  and streams in the warned area. Between 3 and 5 inches of rain 
  have fallen. Although the heavy rain has ended, additional showers 
  are possible through the rest of today and this evening.

* Some locations that may experience flooding include...
  New Brunswick, Morristown, Somerville, Somerset, Edison, East 
  Brunswick, Bridgewater, South Brunswick, North Brunswick, Dover, 
  Madison, and Middlesex.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4072 7474 4105 7444 4102 7443 4100 7430
      4093 7429 4091 7427 4091 7433 4087 7434
      4086 7432 4076 7438 4075 7436 4067 7446
      4066 7445 4066 7440 4062 7443 4060 7446
      4060 7421 4037 7458 4039 7466 4046 7475

$$

Robertson

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 25, 8:26 PM EDT	Special Weather Statement	PHI	Mercer	34 min
Oct 25, 8:33 PM EDT	Special Weather Statement	PHI	Warren	42 min
Oct 25, 9:09 PM EDT	Special Weather Statement	PHI	Middlesex, Morris, Somerset	51 min
Oct 26, 1:22 AM EDT	Areal Flood Warning	PHI	Atlantic, Burlington, Cape May, Cumberland, Ocean	5 hr
Oct 26, 2:08 AM EDT	Flash Flood Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	4 hr
Oct 26, 3:08 AM EDT	Flash Flood Warning	PHI	Middlesex, Monmouth, Ocean	8 hr
Oct 26, 4:14 AM EDT	Flash Flood Warning	PHI	Hunterdon, Middlesex, Morris, Somerset	4 hr
Oct 26, 5:22 AM EDT	Areal Flood Advisory	PHI	Morris, Sussex, Warren	2 hr
Oct 26, 6:09 AM EDT	Areal Flood Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean	3 hr
Oct 26, 6:18 AM EDT	Areal Flood Warning	PHI	Hunterdon, Mercer, Middlesex, Somerset	13 hr
Oct 26, 7:15 AM EDT	Areal Flood Warning	PHI	Monmouth, Ocean	5 hr
Oct 26, 7:32 AM EDT	River Flood Warning	PHI	Somerset	28 hr
Oct 26, 7:38 AM EDT	Areal Flood Warning	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	37 hr
Oct 26, 8:18 AM EDT	River Flood Warning	PHI	Morris, Somerset	8 hr
Oct 26, 10:12 AM EDT	River Flood Warning	PHI	Somerset	11 hr
Oct 26, 10:12 AM EDT	River Flood Warning	PHI	Middlesex, Somerset	24 hr
Oct 26, 10:12 AM EDT	River Flood Warning	PHI	Middlesex, Somerset	33 hr
Oct 26, 10:50 AM EDT	Areal Flood Warning	PHI	Middlesex, Monmouth, Ocean	9 hr
Oct 26, 4:24 PM EDT	River Flood Warning	PHI	Morris	31 hr
Oct 26, 4:28 PM EDT	River Flood Warning	PHI	Morris, Passaic	29 hr
Oct 26, 4:39 PM EDT	River Flood Warning	PHI	Essex, Morris, Passaic	54 hr
Oct 26, 4:39 PM EDT	River Flood Warning	PHI	Essex, Passaic	42 hr

Nearby

Areal Flood Warnings in New Jersey, 2021 Every areal flood warning in 2021

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.