Alert archive / New Jersey / Flash Flood Warnings in 2021
Flash Flood Warning 78, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Sep 1, 2021, 10:05 PM EDT for Morris County, Somerset County, New Jersey. It was in force for 4 hr. 1 report 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 1, 2021, 10:05 PM EDT (02:05 UTC)
- Expired
- Sep 2, 2021, 1:52 AM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Morris County, NJ, Somerset County, NJ
The radar
The Philadelphia radar (KDIX), 106 km from the middle of the area, began a volume at 02:09 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 2, 12:58 AM EDT | HEAVY RAIN 5.8 | Butler, 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, 2.1 hours before the alert went out and 136 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
- 123 J/kg
- Mixed-layer CIN
- -47 J/kg
- Mixed-layer LCL
- 512 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 279 m²/s²
- 0-3 km storm-relative helicity
- 456 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.2
The text
As transmitted.
108
WGUS51 KPHI 020205
FFWPHI
NJC027-035-020600-
/O.NEW.KPHI.FF.W.0078.210902T0205Z-210902T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
1005 PM EDT Wed Sep 1 2021
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Morris County in northern New Jersey...
North Central Somerset County in northern New Jersey...
* Until 200 AM EDT.
* At 1005 PM EDT, local law enforcement reported flash flooding
across the warned area. Several roads are closed in Morris County.
Avoid travel in this area. Between 3.5 and 7 inches of rain have
fallen. Flash flooding is already occurring.
HAZARD...Life threatening flash flooding caused by heavy rain.
SOURCE...Law enforcement reported.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets, and underpasses.
* Some locations that may experience flash flooding include...
Morristown, Dover, Madison, Hopatcong, Florham Park, East Hanover,
Lincoln Park, Kinnelon, Chatham, Boonton, Butler, and Wharton.
This includes the following highways...
Interstate 80 in New Jersey between mile markers 27 and 48.
Interstate 287 in New Jersey between mile markers 30 and 53.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
&&
LAT...LON 4074 7477 4077 7485 4091 7470 4092 7465
4096 7464 4108 7450 4103 7450 4105 7445
4104 7443 4102 7443 4100 7430 4097 7428
4090 7429 4091 7433 4087 7434 4086 7432
4079 7437 4076 7438 4076 7436 4072 7439
FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CMS1 follow-up statement
297
WGUS71 KPHI 020552
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
152 AM EDT Thu Sep 2 2021
NJC027-035-020602-
/O.CAN.KPHI.FF.W.0078.000000T0000Z-210902T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Morris NJ-Somerset NJ-
152 AM EDT Thu Sep 2 2021
...FLASH FLOOD WARNING FOR MORRIS AND NORTH CENTRAL SOMERSET
COUNTIES HAS BEEN REPLACED WITH A FLOOD WARNING...
Please continue to heed road closures.
LAT...LON 4074 7477 4077 7485 4091 7470 4092 7465
4096 7464 4108 7450 4103 7450 4105 7445
4104 7443 4102 7443 4100 7430 4097 7428
4090 7429 4091 7433 4087 7434 4086 7432
4079 7437 4076 7438 4076 7436 4072 7439
$$
CMSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 1, 8:02 PM EDT | Flash Flood Warning | PHI | Middlesex, Morris, Somerset | 5 hr |
| Sep 1, 9:01 PM EDT | Flash Flood Warning | PHI | Burlington, Mercer, Middlesex, Monmouth, Ocean | 5 hr |
| Sep 1, 9:43 PM EDT | River Flood Warning | PHI | Mercer | 33 hr |
| Sep 1, 10:23 PM EDT | Coastal Flood Statement | PHI | Ocean | 13 hr |
| Sep 1, 10:24 PM EDT | Flash Flood Warning | PHI | Burlington, Camden, Gloucester | 4 hr |
| Sep 1, 10:29 PM EDT | River Flood Warning | PHI | Hunterdon, Mercer | 49 hr |
| Sep 1, 10:32 PM EDT | River Flood Warning | PHI | Mercer | 31 hr |
| Sep 1, 10:35 PM EDT | River Flood Warning | PHI | Bergen, Morris, Passaic | 30 hr |
| Sep 1, 10:37 PM EDT | River Flood Warning | PHI | Morris, Passaic | 41 hr |
| Sep 1, 10:38 PM EDT | River Flood Warning | PHI | Morris, Somerset | 21 days |
| Sep 1, 10:47 PM EDT | Areal Flood Warning | PHI | Warren | 23 hr |
| Sep 1, 10:52 PM EDT | Areal Flood Warning | PHI | Hunterdon, Warren | 12 hr |
| Sep 2, 12:01 AM EDT | Areal Flood Warning | PHI | Hunterdon, Morris, Sussex, Warren | 40 hr |
| Sep 2, 12:28 AM EDT | Areal Flood Advisory | PHI | Atlantic, Burlington, Camden, Gloucester | 3 hr |
| Sep 2, 12:31 AM EDT | Areal Flood Advisory | PHI | Monmouth, Ocean | 2 hr |
| Sep 2, 1:38 AM EDT | Areal Flood Warning | PHI | Burlington, Mercer, Middlesex, Monmouth, Ocean | 4 hr |
| Sep 2, 1:52 AM EDT | Areal Flood Warning | PHI | Morris, Somerset | 13 hr |
| Sep 2, 2:23 AM EDT | Areal Flood Warning | PHI | Burlington, Camden, Gloucester, Salem | 9 hr |
| Sep 2, 2:29 AM EDT | Areal Flood Warning | PHI | Burlington, Camden, Gloucester | 5 hr |
| Sep 2, 3:52 AM EDT | Areal Flood Warning | PHI | Hunterdon, Mercer, Morris, Somerset, Warren | 8 hr |
| Sep 2, 3:53 AM EDT | Areal Flood Warning | PHI | Hunterdon, Mercer, Middlesex, Morris, Somerset | 8 hr |
| Sep 2, 4:00 AM EDT | River Flood Warning | PHI | Morris | 48 hr |
| Sep 2, 4:45 AM EDT | River Flood Warning | PHI | Hunterdon, Mercer | 37 hr |
| Sep 2, 4:45 AM EDT | River Flood Warning | PHI | Hunterdon, Warren | 37 hr |
| Sep 2, 4:45 AM EDT | River Flood Warning | PHI | Hunterdon | 37 hr |
| Sep 2, 4:45 AM EDT | River Flood Warning | PHI | Hunterdon | 33 hr |
| Sep 2, 4:45 AM EDT | River Flood Warning | PHI | Hunterdon, Mercer | 34 hr |
| Sep 2, 4:45 AM EDT | River Flood Warning | PHI | Sussex, Warren | 5 hr |
| Sep 2, 6:05 AM EDT | Coastal Flood Warning | PHI | Burlington, Camden, Gloucester, Mercer | 6 hr |
| Sep 2, 1:20 PM EDT | Areal Flood Warning | PHI | Middlesex | 21 hr |
| Sep 2, 6:44 PM EDT | Coastal Flood Advisory | PHI | Burlington, Camden, Gloucester | 7 hr |
Nearby
Flash Flood Warnings in New Jersey, 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.