Alert archive / New Jersey / Flash Flood Warnings in 2018

Flash Flood Warning 109, NWS Philadelphia/Mount Holly

October 12, 20186 counties in New Jersey; Kent County, Queen Anne's County, Maryland; Kent County, New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this flash flood warning at Oct 12, 2018, 12:08 AM EDT for 6 counties in New Jersey; Kent County, Queen Anne's County, Maryland; Kent County, New Castle County, Delaware. 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: Oct 12, 2018, 12:08 AM EDT (04:08 UTC)
Expired: Oct 12, 2018, 4:00 AM EDT
In force: 4 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Flood severity: None

Counties Kent County, DE, New Castle County, DE, Kent County, MD, Queen Anne's County, MD, Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cumberland County, NJ, Gloucester County, NJ, Salem County, NJ

The radar

The Dover AFB radar (KDOX), 68 km from the middle of the area, began a volume at 04:10 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 12, 4:04 AM EDT	FLOOD	1 Ssw South Vineland, NJ	FLOODING ON NJ 55 AT EXIT 26.
Oct 12, 4:04 AM EDT	FLOOD	1 Ssw South Vineland, NJ	FLOODING ON NJ 55 NORTHBOUND AT EXIT 27 (NJ 47). 1 LANE MAY BE BLOCKED.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 4.1 hours before the alert went out and 167 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: 959 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 634 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 212 m²/s²
0-3 km storm-relative helicity: 200 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 4.3

Open this sounding in Storm Lab

The text

As transmitted.

447 
WGUS51 KPHI 120408
FFWPHI
DEC001-003-MDC029-035-NJC001-005-007-011-015-033-120800-
/O.NEW.KPHI.FF.W.0109.181012T0408Z-181012T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1208 AM EDT FRI OCT 12 2018

The National Weather Service in Mount Holly NJ has issued a

* Flash Flood Warning for...
  Southwestern New Castle County in northern Delaware...
  Northwestern Kent County in central Delaware...
  North central Queen Anne's County in northeastern Maryland...
  Northeastern Kent County in northeastern Maryland...
  Northwestern Atlantic County in southern New Jersey...
  Northwestern Cumberland County in southern New Jersey...
  Salem County in southern New Jersey...
  Camden County in southern New Jersey...
  Gloucester County in southern New Jersey...
  Central Burlington County in southern New Jersey...

* Until 400 AM EDT.

* At 1205 AM EDT, Doppler radar indicated heavy rain across the 
  warned area. Up to three inches of rain have already fallen across 
  portions of the advised area. Additional rainfall amounts of two 
  inches are possible. This amount of rainfall is capable of 
  producing flash flooding. 

* Some locations that could experience flooding include...
  Vineland, Millville, Bridgeton, Middletown, Gloucester City, Cherry
  Hill, Evesham, Mount Laurel, Willingboro, Deptford, Voorhees,
  Medford, Glassboro, Lindenwold, Hammonton, Lumberton, Bellmawr,
  Woodbury, Smyrna and Mount Holly.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3923 7599 3938 7579 3938 7577 3940 7577
      4004 7491 3991 7448 3925 7523 3927 7531
      3939 7548 3929 7539

$$

Kruzdlo

1 follow-up statement

191 
WGUS71 KPHI 120751
FFSPHI

Flash Flood Statement
National Weather Service Mount Holly NJ
351 AM EDT FRI OCT 12 2018

DEC001-003-MDC029-035-NJC001-005-007-011-015-033-120800-
/O.EXP.KPHI.FF.W.0109.000000T0000Z-181012T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
New Castle DE-Kent DE-Queen Anne's MD-Kent MD-Atlantic NJ-
Cumberland NJ-Salem NJ-Camden NJ-Gloucester NJ-Burlington NJ-
351 AM EDT FRI OCT 12 2018

...THE FLASH FLOOD WARNING FOR SOUTHWESTERN NEW CASTLE...NORTHWESTERN
KENT...NORTH CENTRAL QUEEN ANNE'S...NORTHEASTERN KENT...NORTHWESTERN
ATLANTIC...NORTHWESTERN CUMBERLAND...SALEM...CAMDEN...GLOUCESTER AND
CENTRAL BURLINGTON COUNTIES WILL EXPIRE AT 400 AM EDT...

This flash flood warning has been converted to a flood warning. Up 
to four inches of rain fell since last evening. It will take some 
time to drain.

LAT...LON 3923 7599 3938 7579 3938 7577 3940 7577
      4004 7491 3991 7448 3925 7523 3927 7531
      3939 7548 3929 7539

$$

Kruzdlo

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 11, 8:09 PM EDT	Special Weather Statement	PHI	Salem	36 min
Oct 11, 8:27 PM EDT	Areal Flood Advisory	PHI	Cumberland, Gloucester, Salem	8 hr
Oct 11, 8:41 PM EDT	Special Weather Statement	PHI	Gloucester, Salem	34 min
Oct 11, 9:10 PM EDT	Special Weather Statement	PHI	Camden, Gloucester, Salem	35 min
Oct 11, 9:43 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester	8 hr
Oct 11, 10:45 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 1 more	3 hr
Oct 11, 11:54 PM EDT	High Wind Warning	PHI	Cape May	9 hr
Oct 12, 12:14 AM EDT	Storm Warning	PHI		9 hr
Oct 12, 12:50 AM EDT	Areal Flood Advisory	PHI	Burlington, Mercer, Monmouth, Ocean	3 hr
Oct 12, 1:15 AM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Cape May, Cumberland, Ocean	40 min
Oct 12, 1:52 AM EDT	Flash Flood Warning	PHI	Atlantic, Burlington, Cape May, Cumberland, Ocean	4 hr
Oct 12, 2:55 AM EDT	Areal Flood Advisory	PHI	Gloucester, Hunterdon, Mercer, Middlesex, Somerset, Warren	2 hr
Oct 12, 3:17 AM EDT	Flash Flood Warning	PHI	Burlington, Mercer, Monmouth, Ocean	4 hr
Oct 12, 3:46 AM EDT	Areal Flood Warning	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Salem	7 hr
Oct 12, 5:32 AM EDT	Areal Flood Warning	PHI	Atlantic, Burlington, Cape May, Cumberland, Ocean	4 hr
Oct 12, 7:02 AM EDT	Areal Flood Warning	PHI	Burlington, Mercer, Monmouth, Ocean	4 hr
Oct 12, 11:42 AM EDT	Coastal Flood Advisory	PHI	Atlantic, Burlington, Cape May, Middlesex, Monmouth, Ocean	4 hr
Oct 12, 11:45 AM EDT	Small Craft Advisory	PHI		12 hr
Oct 12, 3:20 PM EDT	River Flood Warning	PHI	Burlington	37 hr
Oct 11, 10:06 PM EDT	Flash Flood Warning	PHI	Caroline, Kent, Queen Anne's, Talbot	6 hr
Oct 11, 11:36 PM EDT	Flash Flood Warning	PHI	Kent, Queen Anne's	4 hr
Oct 11, 11:47 PM EDT	Flash Flood Warning	PHI	Caroline, Talbot	4 hr
Oct 12, 3:28 AM EDT	Areal Flood Warning	PHI	Caroline, Talbot	6 hr
Oct 12, 3:36 AM EDT	Areal Flood Warning	PHI	Caroline, Kent, Queen Anne's, Talbot	6 hr
Oct 12, 2:46 PM EDT	Areal Flood Warning	PHI	Kent	7 hr

Nearby

Flash Flood Warnings in New Jersey, 2018 Flash Flood Warnings in Maryland, 2018 Flash Flood Warnings in Delaware, 2018 Every flash flood warning in 2018

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.