Alert archive / New Jersey / Flash Flood Warnings in 2021
Flash Flood Warning 87, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 23, 2021, 3:26 PM EDT for 6 counties in New Jersey; Bucks County, Pennsylvania. It was in force for 2 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
- Sep 23, 2021, 3:26 PM EDT (19:26 UTC)
- Expired
- Sep 23, 2021, 5:54 PM EDT
- In force
- 2 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Burlington County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Morris County, NJ, Somerset County, NJ, Bucks County, PA
The radar
The Philadelphia radar (KDIX), 62 km from the middle of the area, began a volume at 19:28 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 |
|---|---|---|---|
| Sep 23, 3:45 PM EDT | FLOOD | 1 Nne Burlington Twp, NJ | PINEWALD LANE FLOODED. TIME BASED ON SOCIAL MEDIA REPORT. |
| Sep 23, 3:45 PM EDT | FLASH FLOOD | 2 Sse Bethlehem Twp, NJ | INTERSTATE 78 RAMP TO PATTENBURG ROAD CLOSED FROM FLOODING. TIME ESTIMATED FROM RADAR. |
| Sep 23, 3:50 PM EDT | FLOOD | Burlington Twp, NJ | STREET FLOODING ON PINEWALD LANE. |
| Sep 23, 4:27 PM EDT | FLASH FLOOD | Princeton Junction, NJ | WASHINGTON ROAD CLOSED FROM FLOODING. TIME BASED ON DISPATCH REPORT. |
| Sep 23, 5:27 PM EDT | HEAVY RAIN 1.25 | Mercerville, 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 12:00Z, 7.4 hours before the alert went out and 176 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
- 103 J/kg
- Mixed-layer CIN
- -11 J/kg
- Mixed-layer LCL
- 687 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 249 m²/s²
- 0-3 km storm-relative helicity
- 201 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.1
The text
As transmitted.
958
WGUS51 KPHI 231926
FFWPHI
NJC005-019-021-023-027-035-PAC017-232330-
/O.NEW.KPHI.FF.W.0087.210923T1926Z-210923T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
326 PM EDT Thu Sep 23 2021
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Mercer County in central New Jersey...
Southwestern Middlesex County in northern New Jersey...
Southwestern Morris County in northern New Jersey...
Western Somerset County in northern New Jersey...
Hunterdon County in northwestern New Jersey...
North Central Burlington County in southern New Jersey...
Central Bucks County in southeastern Pennsylvania...
* Until 730 PM EDT.
* At 326 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen and an additional inch or so is expected over the next
hour. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
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 may experience flash flooding include...
Trenton, Ewing, Princeton, Florence, Burlington, Bristol,
Doylestown, Byram, Bedminster, Hightstown, Flemington, and Tinicum.
This includes the following highways...
New Jersey Turnpike between exits 6 and 8.
Pennsylvania Turnpike between mile markers 355 and 359.
Interstate 95 in Pennsylvania near mile marker 40.
Interstate 78 in New Jersey between mile markers 8 and 28.
Interstate 295 in New Jersey between mile markers 48 and 76.
Interstate 195 in New Jersey between mile markers 0 and 7.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4029 7450 4018 7459 4018 7461 4017 7460
3997 7476 4009 7486 4051 7535 4060 7519
4060 7518 4062 7516 4071 7497 4082 7479
FLASH FLOOD...RADAR INDICATED
$$
NC1 follow-up statement
403
WGUS71 KPHI 232154
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
554 PM EDT Thu Sep 23 2021
NJC005-019-021-023-027-035-PAC017-232204-
/O.CAN.KPHI.FF.W.0087.000000T0000Z-210923T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Burlington NJ-Hunterdon NJ-Mercer NJ-Middlesex NJ-Morris NJ-Somerset
NJ-Bucks PA-
554 PM EDT Thu Sep 23 2021
...FLASH FLOOD WARNING IS CANCELLED FOR MERCER, SOUTHWESTERN
MIDDLESEX, SOUTHWESTERN MORRIS, WESTERN SOMERSET, HUNTERDON, NORTH
CENTRAL BURLINGTON, AND CENTRAL BUCKS COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
A Flash Flood Watch remains in effect until 200 AM EDT Friday for
portions of northern Delaware...and southeast Pennsylvania.
A Flash Flood Watch remains in effect until 500 AM EDT Friday for
portions of central New Jersey...northern New Jersey...and northwest
New Jersey.
A Flash Flood Watch remains in effect until 200 AM EDT Friday for
portions of east central Pennsylvania...northeast Pennsylvania...and
southeast Pennsylvania.
LAT...LON 4029 7450 4018 7459 4018 7461 4017 7460
3997 7476 4009 7486 4051 7535 4060 7519
4060 7518 4062 7516 4071 7497 4082 7479
$$
NCThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 22, 8:43 PM EDT | Gale Warning | PHI | 18 hr | |
| Sep 23, 9:12 AM EDT | Coastal Flood Advisory | PHI | Burlington, Camden, Gloucester | 10 hr |
| Sep 23, 11:33 AM EDT | Areal Flood Advisory | PHI | Cumberland, Gloucester, Salem | 3 hr |
| Sep 23, 11:57 AM EDT | Flash Flood Warning | PHI | Gloucester, Salem | 3 hr |
| Sep 23, 12:12 PM EDT | Severe Thunderstorm Warning | PHI | Gloucester, Salem | 48 min |
| Sep 23, 12:54 PM EDT | Special Weather Statement | PHI | Gloucester | 51 min |
| Sep 23, 12:56 PM EDT | Areal Flood Advisory | PHI | Burlington, Camden, Hunterdon, Mercer, Warren | 3 hr |
| Sep 23, 1:13 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Gloucester, Salem | 47 min |
| Sep 23, 1:42 PM EDT | Flash Flood Warning | PHI | Burlington, Camden, Gloucester | 4 hr |
| Sep 23, 1:58 PM EDT | Special Weather Statement | PHI | Camden, Hunterdon | 32 min |
| Sep 23, 2:37 PM EDT | Areal Flood Advisory | PHI | Burlington, Hunterdon, Mercer, Middlesex, Monmouth, Morris and 3 more | 3 hr |
| Sep 23, 2:47 PM EDT | Special Weather Statement | PHI | Hunterdon, Mercer | 28 min |
| Sep 23, 2:52 PM EDT | Special Weather Statement | PHI | Camden | 23 min |
| Sep 23, 3:13 PM EDT | Special Weather Statement | PHI | Mercer, Somerset | 32 min |
| Sep 23, 3:16 PM EDT | Special Weather Statement | PHI | Burlington | 29 min |
| Sep 23, 3:23 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer, Middlesex, Morris, Somerset | 52 min |
| Sep 23, 3:50 PM EDT | Special Weather Statement | PHI | Burlington | 25 min |
| Sep 23, 4:21 PM EDT | Areal Flood Advisory | PHI | Middlesex, Monmouth, Morris, Ocean, Somerset, Sussex | 15 min |
| Sep 23, 4:36 PM EDT | Flash Flood Warning | PHI | Middlesex, Monmouth, Morris, Somerset, Sussex | 3 hr |
| Sep 23, 5:00 PM EDT | Special Weather Statement | PHI | Monmouth | 30 min |
| Sep 23, 10:52 AM EDT | Areal Flood Advisory | PHI | Chester | 3 hr |
| Sep 23, 11:40 AM EDT | Areal Flood Advisory | PHI | Berks, Bucks, Carbon, Lehigh, Montgomery, Northampton | 3 hr |
| Sep 23, 12:28 PM EDT | Flash Flood Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 4 hr |
| Sep 23, 12:57 PM EDT | Special Weather Statement | PHI | Bucks | 33 min |
| Sep 23, 1:48 PM EDT | River Flood Warning | PHI | Chester | 5 hr |
| Sep 23, 4:26 PM EDT | Areal Flood Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 80 min |
| Sep 23, 7:18 PM EDT | Areal Flood Warning | PHI | Berks, Montgomery | 36 min |
Nearby
Flash Flood Warnings in New Jersey, 2021Flash Flood Warnings in Pennsylvania, 2021Every flash 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.