Alert archive / New Jersey / Flash Flood Warnings in 2020
Flash Flood Warning 61, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 13, 2020, 10:01 AM EDT for Middlesex County, Morris County, Somerset County, New Jersey. It was in force for 3 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
- Aug 13, 2020, 10:01 AM EDT (14:01 UTC)
- Expired
- Aug 13, 2020, 12:32 PM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Middlesex County, NJ, Morris County, NJ, Somerset County, NJ
The radar
The Philadelphia radar (KDIX), 79 km from the middle of the area, began a volume at 14:01 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, 2.0 hours before the alert went out and 132 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.
- Mixed-layer CAPE
- 1326 J/kg
- Mixed-layer CIN
- -24 J/kg
- Mixed-layer LCL
- 599 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 26 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
422
WGUS51 KPHI 131401
FFWPHI
NJC023-027-035-131800-
/O.NEW.KPHI.FF.W.0061.200813T1401Z-200813T1800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1001 AM EDT Thu Aug 13 2020
The National Weather Service in Mount Holly NJ has issued a
* Flash Flood Warning for...
Southeastern Morris County in northern New Jersey...
Northeastern Somerset County in northern New Jersey...
Northeastern Middlesex County in northern New Jersey...
* Until 200 PM EDT.
* At 1001 AM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Up to two inches of rain have
already fallen. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar indicated.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other
drainage and low lying areas.
* Some locations that could experience flooding include...
Somerville, Carteret, Madison, Middlesex, Bound Brook, Chatham,
Mendham, Peapack And Gladstone, Far Hills, Colonia, Martinsville,
Millington, Basking Ridge, Woodbridge, South Plainfield, North
Plainfield, Bernardsville, Dunellen, Watchung and Iselin.
Additional rainfall amounts of 1 to 2 inches are possible in the
warned area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
Turn around...don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4056 7459 4075 7464 4077 7437 4076 7438
4075 7436 4074 7437 4067 7446 4066 7445
4065 7440 4060 7446 4061 7433 4059 7429
4059 7421 4057 7421
FLASH FLOOD...RADAR INDICATED
$$
JEO1 follow-up statement
218
WGUS71 KPHI 131632
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1232 PM EDT Thu Aug 13 2020
NJC023-027-035-131642-
/O.CAN.KPHI.FF.W.0061.000000T0000Z-200813T1800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Morris NJ-Somerset NJ-Middlesex NJ-
1232 PM EDT Thu Aug 13 2020
...THE FLASH FLOOD WARNING FOR SOUTHEASTERN MORRIS...NORTHEASTERN
SOMERSET AND NORTHEASTERN MIDDLESEX COUNTIES IS CANCELLED...
The heavy rain has ended. Flood waters have receded. Flooding is no
longer expected to pose a threat. Please continue to heed any
remaining road closures.
LAT...LON 4056 7459 4075 7464 4077 7437 4076 7438
4075 7436 4074 7437 4067 7446 4066 7445
4065 7440 4060 7446 4061 7433 4059 7429
4059 7421 4057 7421
$$
JEOThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 3:02 AM EDT | Flash Flood Watch | PHI | Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 7 more | 17 hr |
| Aug 13, 7:47 AM EDT | Areal Flood Advisory | PHI | Hunterdon, Mercer, Middlesex, Somerset | 118 min |
| Aug 13, 8:37 AM EDT | Flash Flood Warning | PHI | Hunterdon, Mercer, Middlesex, Somerset | 3 hr |
| Aug 13, 9:36 AM EDT | Areal Flood Advisory | PHI | Hunterdon, Middlesex, Morris, Somerset | 114 min |
| Aug 13, 1:06 PM EDT | Special Weather Statement | PHI | Ocean | 39 min |
| Aug 13, 1:30 PM EDT | Special Weather Statement | PHI | Cumberland | 45 min |
| Aug 13, 1:56 PM EDT | Areal Flood Advisory | PHI | Atlantic, Cape May, Cumberland | 2 hr |
| Aug 13, 1:58 PM EDT | Areal Flood Advisory | PHI | Atlantic, Burlington, Ocean | 2 hr |
| Aug 13, 2:44 PM EDT | Areal Flood Advisory | PHI | Atlantic | 2 hr |
| Aug 13, 3:54 PM EDT | Special Weather Statement | PHI | Cape May | 36 min |
| Aug 13, 4:01 PM EDT | Areal Flood Advisory | PHI | Cape May | 2 hr |
| Aug 13, 4:52 PM EDT | Flash Flood Warning | PHI | Cape May | 113 min |
Nearby
Flash Flood Warnings in New Jersey, 2020Every flash flood warning in 2020
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.