Alert archive / New Jersey / Flash Flood Warnings in 2021
Flash Flood Warning 31, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this flash flood warning at Jul 29, 2021, 8:43 PM EDT for Monmouth County, Ocean County, New Jersey. It was in force for 3 hr. 3 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
- Jul 29, 2021, 8:43 PM EDT (00:43 UTC)
- Expired
- Jul 30, 2021, 12:00 AM EDT
- In force
- 3 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Flood severity
- None
Counties Monmouth County, NJ, Ocean County, NJ
The radar
The Philadelphia radar (KDIX), 30 km from the middle of the area, began a volume at 00:43 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 |
|---|---|---|---|
| Jul 29, 8:45 PM EDT | FLASH FLOOD | 1 Sw Wanamassa, NJ | NJ ROUTE 35 CLOSED AT NJ ROUTE 66 IN NEPTUNE TOWNSHIP. |
| Jul 29, 8:45 PM EDT | FLASH FLOOD | Manasquan, NJ | NJ ROUTE 71 CLOSED DUE TO FLOODING NEAR MAIN STREET. |
| Jul 29, 8:50 PM EDT | FLASH FLOOD | 1 Wnw Lake Como, NJ | NJ ROUTE 35 CLOSED AT BELMAR BOULEVARD IN BELMAR. |
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, 0.7 hours before the alert went out and 137 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
- 635 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 502 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 381 m²/s²
- 0-3 km storm-relative helicity
- 515 m²/s²
- Significant tornado parameter
- 1.3
- Supercell composite
- 5.0
The text
As transmitted.
870
WGUS51 KPHI 300043
FFWPHI
NJC025-029-300445-
/O.NEW.KPHI.FF.W.0031.210730T0043Z-210730T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Mount Holly NJ
843 PM EDT Thu Jul 29 2021
The National Weather Service in Mount Holly has issued a
* Flash Flood Warning for...
Southeastern Monmouth County in central New Jersey...
Northeastern Ocean County in southern New Jersey...
* Until 1245 AM EDT.
* At 843 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen. Additional rainfall amounts of 0.5 to 1 inch are
possible in the warned area. 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 will experience flash flooding include...
Toms River, Asbury Park, Lakewood, Howell, Tinton Falls,
Manasquan, Point Pleasant Beach, Seaside Heights, Farmingdale,
Mantoloking, Allenwood, and Brick Township.
This includes the following highways...
Interstate 195 in New Jersey between mile markers 29 and 34.
Garden State Parkway between mile markers 85 and 104.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Motorists should not attempt to drive around barricades or drive
cars through flooded areas.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Be aware of your surroundings and do not drive on flooded roads.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 4003 7431 4027 7415 4020 7385 3991 7396
FLASH FLOOD...RADAR INDICATED
$$
MPS2 follow-up statements
641
WGUS71 KPHI 300258
FFSPHI
Flash Flood Statement
National Weather Service Mount Holly NJ
1058 PM EDT Thu Jul 29 2021
NJC025-029-300445-
/O.CON.KPHI.FF.W.0031.000000T0000Z-210730T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Monmouth NJ-Ocean NJ-
1058 PM EDT Thu Jul 29 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1245 AM EDT FRIDAY
FOR SOUTHEASTERN MONMOUTH AND NORTHEASTERN OCEAN COUNTIES...
At 1058 PM EDT, Doppler radar indicated thunderstorms produced heavy
rain across the warned area. Between 1 and 3 inches of rain have
fallen. Flash flooding is ongoing.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flooding of small creeks and streams, urban areas,
highways, streets, and underpasses as well as other
drainage and low lying areas.
Some locations that will experience flash flooding include...
Toms River, Asbury Park, Lakewood, Howell, Tinton Falls,
Manasquan, Point Pleasant Beach, Seaside Heights, Farmingdale,
Mantoloking, Allenwood, and Brick Township.
This includes the following highways...
Interstate 195 in New Jersey between mile markers 29 and 34.
Garden State Parkway between mile markers 85 and 104.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around...don't drown when encountering flooded roads. Most
flood deaths occur in vehicles.
Motorists should not attempt to drive around barricades or drive
cars through flooded areas.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Be aware of your surroundings and do not drive on flooded roads.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 4003 7431 4027 7415 4020 7385 3991 7396
FLASH FLOOD...RADAR INDICATED
$$
MPS075 WGUS71 KPHI 300400 FFSPHI Flash Flood Statement National Weather Service Mount Holly NJ 1200 AM EDT Fri Jul 30 2021 NJC025-029-300410- /O.CAN.KPHI.FF.W.0031.000000T0000Z-210730T0445Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Monmouth NJ-Ocean NJ- 1200 AM EDT Fri Jul 30 2021 ...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHEASTERN MONMOUTH AND NORTHEASTERN OCEAN COUNTIES... Flood waters have receded. The heavy rain has ended. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. LAT...LON 4003 7431 4027 7415 4020 7385 3991 7396 $$ MPS
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 8:03 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Monmouth, Ocean | 57 min |
| Jul 29, 8:03 PM EDT | Tornado Warning | PHI | Ocean | 27 min |
| Jul 29, 8:19 PM EDT | Flash Flood Warning | PHI | Burlington, Monmouth, Ocean | 4 hr |
| Jul 29, 8:39 PM EDT | Tornado Warning | PHI | Burlington, Ocean | 51 min |
| Jul 29, 8:42 PM EDT | Tornado Warning | PHI | Monmouth | 19 min |
| Jul 29, 9:15 PM EDT | Special Marine Warning | PHI | 2 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.