Alert archive / New Jersey / Flash Flood Warnings in 2018
Flash Flood Warning 76, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Aug 17, 2018, 11:30 PM EDT for 4 counties in New Jersey. It was in force for 4 hr. 5 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
- Aug 17, 2018, 11:30 PM EDT (03:30 UTC)
- Expired
- Aug 18, 2018, 3:30 AM EDT
- In force
- 4 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), 80 km from the middle of the area, began a volume at 03:30 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 |
|---|---|---|---|
| Aug 17, 11:45 PM EDT | FLOOD | 1 N Pluckemin, NJ | REPORT OF MINOR FLOODING ON 287 NORTHBOUND AT MILE MARKER 22. TIME ESTIMATED FROM RADAR. |
| Aug 18, 12:00 AM EDT | FLOOD | 1 S Pluckemin, NJ | CONSIDERABLE STREAM, ROAD, AND FIELD FLOODING. CHAMBERS BROOK OVERFLOWING. MEASURED 2.34 INCHES IN 3.5 HOURS. |
| Aug 18, 12:00 AM EDT | HEAVY RAIN 2.38 | Somerset Airport, NJ | 1.62 INCHES MEASURED BETWEEN 11 PM AND MIDNIGHT. |
| Aug 18, 12:00 AM EDT | HEAVY RAIN 2.52 | 1 Ne Green Knoll, NJ | HADS SENSOR AT MARTINSVILLE. |
| Aug 18, 12:08 AM EDT | HEAVY RAIN 2.03 | Basking Ridge, NJ |
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 00:00Z, 3.5 hours before the alert went out and 138 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
- 802 J/kg
- Mixed-layer CIN
- -65 J/kg
- Mixed-layer LCL
- 900 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 59 m²/s²
- 0-3 km storm-relative helicity
- 119 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
863
WGUS51 KPHI 180330
FFWPHI
NJC019-023-027-035-180730-
/O.NEW.KPHI.FF.W.0076.180818T0330Z-180818T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1130 PM EDT FRI AUG 17 2018
The National Weather Service in Mount Holly NJ has issued a
* Flash Flood Warning for...
Southeastern Morris County in northern New Jersey...
East central Hunterdon County in northwestern New Jersey...
Somerset County in northern New Jersey...
North central Middlesex County in northern New Jersey...
* Until 330 AM EDT.
* At 1130 PM EDT, Doppler radar indicated thunderstorms producing
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, Somerville, Bridgewater, Madison, Middlesex, Florham
Park, East Hanover, Bound Brook, Manville, Chatham, Mendham,
Peapack And Gladstone, Far Hills, Flagtown, Martinsville,
Millington, White House Station, Basking Ridge, South Plainfield
and North Plainfield.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Move to higher ground now. Act quickly to protect your life.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Please report flooding to your local law enforcement agency when you
can do so safely.
A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.
&&
LAT...LON 4048 7475 4069 7479 4084 7438 4080 7435
4076 7438 4075 7436 4067 7446 4066 7445
4066 7441 4065 7440 4063 7442 4060 7446
4060 7430
$$
MPS2 follow-up statements
555
WGUS71 KPHI 180423
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1223 AM EDT SAT AUG 18 2018
NJC019-023-027-035-180730-
/O.CON.KPHI.FF.W.0076.000000T0000Z-180818T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Morris NJ-Hunterdon NJ-Somerset NJ-Middlesex NJ-
1223 AM EDT SAT AUG 18 2018
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 AM EDT FOR
SOUTHEASTERN MORRIS...EAST CENTRAL HUNTERDON...SOMERSET AND NORTH
CENTRAL MIDDLESEX COUNTIES...
At 1222 AM EDT, Doppler radar indicated heavy rain fell across the
warned area. Up to two inches of rain have already fallen. Flash
flooding is already occurring. Many of the area rivers and streams
are quickly rising in response to the heavy rain.
Some locations that could experience flooding include...
Morristown, Somerville, Bridgewater, Madison, Middlesex, Florham
Park, East Hanover, Bound Brook, Manville, Chatham, Mendham, Peapack
And Gladstone, Far Hills, Flagtown, Martinsville, Millington, White
House Station, Basking Ridge, South Plainfield and North Plainfield.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Move to higher ground now. Act quickly to protect your life.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Please report flooding to your local law enforcement agency when you
can do so safely.
&&
LAT...LON 4048 7475 4069 7479 4084 7438 4080 7435
4076 7438 4075 7436 4067 7446 4066 7445
4066 7441 4065 7440 4063 7442 4060 7446
4060 7430
$$
MPS402
WGUS71 KPHI 180720
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
320 AM EDT SAT AUG 18 2018
NJC019-023-027-035-180730-
/O.EXP.KPHI.FF.W.0076.000000T0000Z-180818T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Morris NJ-Hunterdon NJ-Somerset NJ-Middlesex NJ-
320 AM EDT SAT AUG 18 2018
...THE FLASH FLOOD WARNING FOR SOUTHEASTERN MORRIS...EAST CENTRAL
HUNTERDON...SOMERSET AND NORTH CENTRAL MIDDLESEX COUNTIES WILL EXPIRE
AT 330 AM EDT...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed any remaining road closures.
LAT...LON 4048 7475 4069 7479 4084 7438 4080 7435
4076 7438 4075 7436 4067 7446 4066 7445
4066 7441 4065 7440 4063 7442 4060 7446
4060 7430
$$
MPSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 8:17 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Somerset, Sussex, Warren | 43 min |
| Aug 17, 8:47 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer, Middlesex, Morris, Somerset, Sussex | 43 min |
| Aug 17, 8:48 PM EDT | Special Weather Statement | PHI | Sussex | 27 min |
| Aug 17, 9:26 PM EDT | Special Weather Statement | PHI | Mercer, Middlesex, Somerset | 34 min |
| Aug 17, 10:59 PM EDT | Areal Flood Advisory | PHI | Hunterdon, Middlesex, Morris, Somerset, Warren | 75 min |
| Aug 17, 11:25 PM EDT | Special Weather Statement | PHI | Somerset | 35 min |
| Aug 17, 11:41 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Morris, Somerset | 34 min |
| Aug 17, 11:52 PM EDT | Special Weather Statement | PHI | Middlesex | 23 min |
| Aug 18, 12:56 AM EDT | Areal Flood Advisory | PHI | Gloucester, Salem | 4 hr |
| Aug 18, 2:37 AM EDT | Special Weather Statement | PHI | Ocean | 23 min |
| Aug 18, 2:38 AM EDT | Special Marine Warning | PHI | 52 min | |
| Aug 18, 2:41 AM EDT | Special Weather Statement | PHI | Atlantic, Cumberland | 34 min |
| Aug 18, 2:46 AM EDT | Severe Thunderstorm Warning | PHI | Ocean | 14 min |
| Aug 18, 3:15 AM EDT | Special Marine Warning | PHI | 30 min | |
| Aug 18, 3:16 AM EDT | Flash Flood Watch | PHI | Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 7 more | 20 hr |
| Aug 18, 3:34 PM EDT | Special Weather Statement | PHI | Sussex | 41 min |
| Aug 18, 3:40 PM EDT | Small Craft Advisory | PHI | 45 hr | |
| Aug 18, 4:14 PM EDT | Special Weather Statement | PHI | Sussex | 46 min |
| Aug 18, 4:33 PM EDT | Special Weather Statement | PHI | Gloucester | 42 min |
| Aug 18, 5:16 PM EDT | Special Weather Statement | PHI | Burlington, Camden | 44 min |
| Aug 18, 5:44 PM EDT | Areal Flood Advisory | PHI | Burlington, Camden | 98 min |
| Aug 18, 5:55 PM EDT | Special Weather Statement | PHI | Burlington | 35 min |
| Aug 18, 6:17 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 43 min |
| Aug 18, 6:31 PM EDT | Special Marine Warning | PHI | 119 min | |
| Aug 18, 6:44 PM EDT | Severe Thunderstorm Warning | PHI | Ocean | 29 min |
Nearby
Flash Flood Warnings in New Jersey, 2018Every 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.