Alert archive / New Jersey / Areal Flood Warnings in 2021
Areal Flood Warning 13, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this areal flood warning at Jul 18, 2021, 9:08 AM EDT for Somerset County, New Jersey. It was in force for 2 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
- Jul 18, 2021, 9:08 AM EDT (13:08 UTC)
- Expired
- Jul 18, 2021, 11:37 AM EDT
- In force
- 2 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
County Somerset County, NJ
The radar
The Philadelphia radar (KDIX), 71 km from the middle of the area, began a volume at 13:11 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, 1.1 hours before the alert went out and 159 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
- 888 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 504 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 125 m²/s²
- 0-3 km storm-relative helicity
- 132 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 2.5
The text
As transmitted.
579
WGUS41 KPHI 181308
FLWPHI
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Flood Warning
National Weather Service Mount Holly NJ
908 AM EDT Sun Jul 18 2021
NJC035-182000-
/O.NEW.KPHI.FA.W.0013.210718T1308Z-210718T2000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Somerset NJ-
908 AM EDT Sun Jul 18 2021
The National Weather Service in Mount Holly has issued a
* Flood Warning for...
Southwestern Somerset County in northern New Jersey...
* Until 400 PM EDT Sunday.
* At 908 AM EDT, lingering flooding was occurring. Between 3 and 5
inches of rain fell in the area on Saturday afternoon and evening.
* Some locations that may still be experience flooding include...
Somerville, Bridgewater, Manville, Rocky Hill, Millstone,
Flagtown, Belle Mead, Skillman, Cloverhill, and Raritan.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Motorists should not attempt to drive around barricades or drive
cars through flooded areas.
&&
LAT...LON 4061 7471 4061 7464 4060 7463 4057 7461
4045 7458 4040 7462 4041 7474 4051 7480
4051 7479 4050 7478 4051 7477 4055 7474
4057 7473 4058 7471 4059 7472 4060 7472
$$
Iovino1 follow-up statement
182
WGUS81 KPHI 181537 RRA
FLSPHI
Flood Statement
National Weather Service Mount Holly NJ
1137 AM EDT Sun Jul 18 2021
NJC035-181547-
/O.CAN.KPHI.FA.W.0013.000000T0000Z-210718T2000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Somerset NJ-
1137 AM EDT Sun Jul 18 2021
...FLOOD WARNING IS CANCELLED FOR SOUTHWESTERN SOMERSET COUNTY...
Flood waters have receded. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 4061 7471 4061 7464 4060 7463 4057 7461
4045 7458 4040 7462 4041 7474 4051 7480
4051 7479 4050 7478 4051 7477 4055 7474
4057 7473 4058 7471 4059 7472 4060 7472
$$
IovinoThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 8:00 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Mercer, Monmouth | 45 min |
| Jul 17, 8:09 PM EDT | Flash Flood Warning | PHI | Mercer, Somerset | 4 hr |
| Jul 17, 8:35 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Gloucester | 40 min |
| Jul 17, 8:36 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Middlesex, Monmouth, Ocean, Somerset | 54 min |
| Jul 17, 8:46 PM EDT | Special Marine Warning | PHI | 59 min | |
| Jul 17, 8:53 PM EDT | Areal Flood Advisory | PHI | Mercer, Middlesex, Monmouth | 3 hr |
| Jul 17, 9:25 PM EDT | Areal Flood Advisory | PHI | Burlington, Camden, Gloucester, Salem | 2 hr |
| Jul 17, 9:27 PM EDT | Severe Thunderstorm Warning | PHI | Gloucester, Salem | 48 min |
| Jul 17, 9:30 PM EDT | Severe Thunderstorm Warning | PHI | Cape May | 29 min |
| Jul 17, 9:36 PM EDT | Flash Flood Warning | PHI | Camden, Gloucester, Salem | 2 hr |
| Jul 17, 9:44 PM EDT | Special Marine Warning | PHI | 61 min | |
| Jul 17, 9:48 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Gloucester, Mercer, Salem | 42 min |
| Jul 17, 10:21 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Mercer, Middlesex, Monmouth, Ocean | 54 min |
| Jul 17, 10:22 PM EDT | Tornado Warning | PHI | Burlington, Monmouth, Ocean | 23 min |
| Jul 17, 10:27 PM EDT | Special Weather Statement | PHI | Burlington, Camden | 33 min |
| Jul 17, 10:38 PM EDT | Tornado Warning | PHI | Burlington, Monmouth, Ocean | 16 min |
| Jul 17, 10:43 PM EDT | Flash Flood Warning | PHI | Burlington, Mercer, Middlesex, Monmouth, Ocean | 79 min |
| Jul 17, 10:47 PM EDT | Special Marine Warning | PHI | 118 min | |
| Jul 17, 10:51 PM EDT | Special Marine Warning | PHI | 114 min | |
| Jul 17, 11:07 PM EDT | Special Weather Statement | PHI | Middlesex | 38 min |
| Jul 17, 11:08 PM EDT | Areal Flood Warning | PHI | Hunterdon | 12 hr |
| Jul 17, 11:11 PM EDT | Special Weather Statement | PHI | Monmouth, Ocean | 34 min |
| Jul 17, 11:20 PM EDT | Special Marine Warning | PHI | 115 min | |
| Jul 17, 11:26 PM EDT | Areal Flood Warning | PHI | Somerset | 10 hr |
| Jul 18, 2:41 AM EDT | Areal Flood Warning | PHI | Mercer | 4 hr |
| Jul 18, 3:48 AM EDT | River Flood Warning | PHI | Mercer | 3 hr |
| Jul 18, 11:03 AM EDT | River Flood Warning | PHI | Middlesex, Somerset | 88 min |
Nearby
Areal Flood Warnings in New Jersey, 2021Every areal 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.