Alert archive / New Jersey / Coastal Flood Advisories in 2021
Coastal Flood Advisory 13, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this coastal flood advisory at Oct 12, 2021, 4:07 AM EDT for Kent County, Sussex County, Delaware; Atlantic County, Cape May County, Cumberland County, New Jersey. It took effect at Oct 12, 2021, 12:00 PM EDT. It was in force for 5 hr.
The area
The counties it named.
The facts
- Issued
- Oct 12, 2021, 4:07 AM EDT (08:07 UTC)
- In effect from
- Oct 12, 2021, 12:00 PM EDT
- Expired
- Oct 12, 2021, 5:00 PM EDT
- In force
- 5 hr
- Issued by
- NWS Philadelphia/Mount Holly
Counties Kent County, DE, Sussex County, DE, Atlantic County, NJ, Cape May County, NJ, Cumberland County, NJ
The radar
The Dover AFB radar (KDOX), 46 km from the middle of the area, began a volume at 08:09 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.
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 00:00Z, 8.1 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 524 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 28 m²/s²
- 0-3 km storm-relative helicity
- 136 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
488
WHUS41 KPHI 120807
CFWPHI
Coastal Hazard Message
National Weather Service Mount Holly NJ
407 AM EDT Tue Oct 12 2021
DEZ003-004-122100-
/O.CAN.KPHI.CF.S.0007.000000T0000Z-211012T1000Z/
/O.NEW.KPHI.CF.Y.0013.211012T1600Z-211012T2100Z/
Inland Sussex-Delaware Beaches-
407 AM EDT Tue Oct 12 2021
...COASTAL FLOOD ADVISORY IN EFFECT FROM NOON TODAY TO 5 PM EDT
THIS AFTERNOON...
* WHAT...Up to one foot of inundation above ground level
expected in low-lying areas near shorelines and tidal
waterways.
* WHERE...Inland Sussex and Delaware Beaches.
* WHEN...From noon today to 5 PM EDT this afternoon.
* IMPACTS...At this level, flooding begins on the most
vulnerable roads in coastal and bayside communities, and along
inland tidal waterways. Some partial or full road closures are
possible.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Coastal Flood Advisory means that minor tidal flooding is
expected. Minor tidal flooding often results in some road
closures. Usually, the most vulnerable roadways will flood.
Do not leave your vehicle at a location that is prone to tidal
flooding. Do not drive your vehicle through flood waters. The
water may be deeper than you think it is. You will be putting
yourself in danger and your vehicle may be damaged, leading to
costly repairs.
Visit the Advanced Hydrologic Prediction Service at
water.weather.gov/ahps for additional water level and flood
impact information for your local tide gauge.
&&
Time of high total tides are approximate to the nearest hour.
Delaware Bay at Lewes
MLLW Categories - Minor 6.0 ft, Moderate 7.0 ft, Major 8.0 ft
MHHW Categories - Minor 1.3 ft, Moderate 2.3 ft, Major 3.3 ft
Total Total Departure
Day/Time Tide Tide from Norm Flood
ft MLLW ft MHHW ft Impact
-------- --------- --------- --------- --------
12/02 AM 5.4 0.8 1.6 None
12/02 PM 6.6 2.0 1.6 Minor
13/03 AM 5.1 0.5 1.4 None
13/03 PM 6.2 1.5 1.3 Minor
14/04 AM 4.9 0.2 1.2 None
14/05 PM 6.0 1.3 1.2 Minor
&&
$$
DEZ002-NJZ021>025-122100-
/O.NEW.KPHI.CF.Y.0013.211012T1600Z-211012T2100Z/
Kent-Cumberland-Atlantic-Cape May-Atlantic Coastal Cape May-
Coastal Atlantic-
407 AM EDT Tue Oct 12 2021
...COASTAL FLOOD ADVISORY IN EFFECT FROM NOON TODAY TO 5 PM EDT
THIS AFTERNOON...
* WHAT...Up to one foot of inundation above ground level
expected in low-lying areas near shorelines and tidal
waterways.
* WHERE...In New Jersey, Cumberland, Atlantic, Cape May,
Atlantic Coastal Cape May and Coastal Atlantic. In Delaware,
Kent.
* WHEN...From noon today to 5 PM EDT this afternoon.
* IMPACTS...At this level, flooding begins on the most
vulnerable roads in coastal and bayside communities, and along
inland tidal waterways. Some partial or full road closures are
possible.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Coastal Flood Advisory means that minor tidal flooding is
expected. Minor tidal flooding often results in some road
closures. Usually, the most vulnerable roadways will flood.
Do not leave your vehicle at a location that is prone to tidal
flooding. Do not drive your vehicle through flood waters. The
water may be deeper than you think it is. You will be putting
yourself in danger and your vehicle may be damaged, leading to
costly repairs.
Visit the Advanced Hydrologic Prediction Service at
water.weather.gov/ahps for additional water level and flood
impact information for your local tide gauge.
&&
Time of high total tides are approximate to the nearest hour.
Murderkill River at Bowers Beach
MLLW Categories - Minor 6.1 ft, Moderate 7.1 ft, Major 8.1 ft
MHHW Categories - Minor 0.9 ft, Moderate 1.9 ft, Major 2.9 ft
Total Total Departure
Day/Time Tide Tide from Norm Flood
ft MLLW ft MHHW ft Impact
-------- --------- --------- --------- --------
12/03 AM 5.5 0.3 1.1 None
12/03 PM 6.6 1.4 0.7 Minor
13/04 AM 4.9 -0.3 0.6 None
13/04 PM 6.2 1.0 0.5 Minor
14/04 AM 4.7 -0.5 0.5 None
14/05 PM 6.0 0.8 0.4 None
Maurice River at Bivalve
MLLW Categories - Minor 7.6 ft, Moderate 8.6 ft, Major 9.6 ft
MHHW Categories - Minor 1.3 ft, Moderate 2.3 ft, Major 3.3 ft
Total Total Departure
Day/Time Tide Tide from Norm Flood
ft MLLW ft MHHW ft Impact
-------- --------- --------- --------- --------
12/02 AM 6.7 0.4 1.3 None
12/03 PM 8.0 1.7 1.5 Minor
13/03 AM 6.4 0.1 1.2 None
13/04 PM 7.5 1.2 1.2 None
14/04 AM 6.2 -0.1 1.2 None
14/05 PM 7.3 1.0 1.2 None
Atlantic Ocean at Atlantic City
MLLW Categories - Minor 6.0 ft, Moderate 7.0 ft, Major 8.0 ft
MHHW Categories - Minor 1.4 ft, Moderate 2.4 ft, Major 3.4 ft
Total Total Departure
Day/Time Tide Tide from Norm Flood
ft MLLW ft MHHW ft Impact
-------- --------- --------- --------- --------
12/02 AM 4.6 0.0 1.2 None
12/01 PM 6.3 1.7 1.5 Minor
13/02 AM 4.7 0.1 1.1 None
13/02 PM 5.8 1.2 1.1 None
14/03 AM 4.5 -0.1 1.0 None
14/03 PM 5.7 1.1 1.1 None
Great Egg Harbor Bay at Ocean City
MLLW Categories - Minor 5.3 ft, Moderate 6.3 ft, Major 7.3 ft
MHHW Categories - Minor 1.3 ft, Moderate 2.3 ft, Major 3.3 ft
Total Total Departure
Day/Time Tide Tide from Norm Flood
ft MLLW ft MHHW ft Impact
-------- --------- --------- --------- --------
12/02 AM 4.6 0.6 1.3 None
12/01 PM 5.8 1.8 1.2 Minor
13/02 AM 4.2 0.2 0.8 None
13/03 PM 5.2 1.2 0.7 None
14/03 AM 4.1 0.1 0.8 None
14/04 PM 5.1 1.1 0.7 None
Cape May Harbor at Cape May
MLLW Categories - Minor 6.2 ft, Moderate 7.2 ft, Major 8.2 ft
MHHW Categories - Minor 1.1 ft, Moderate 2.1 ft, Major 3.1 ft
Total Total Departure
Day/Time Tide Tide from Norm Flood
ft MLLW ft MHHW ft Impact
-------- --------- --------- --------- --------
12/02 AM 5.4 0.3 1.5 None
12/01 PM 6.8 1.7 1.5 Minor
13/02 AM 5.1 0.0 1.1 None
13/03 PM 6.3 1.2 1.1 Minor
14/04 AM 5.0 -0.1 1.0 None
14/04 PM 6.1 1.0 1.0 None
&&
$$
NJZ020-026-122100-
/O.EXT.KPHI.CF.S.0007.000000T0000Z-211012T2100Z/
Ocean-Coastal Ocean-
407 AM EDT Tue Oct 12 2021
...MINOR FLOODING ALONG BARNEGAT BAY TODAY...
* WHAT...Up to one foot of inundation above ground level in low-
lying areas near shorelines and tidal waterways.
* WHERE...Barnegat Bay and the tidal waterways that flow into it.
* WHEN...Through this afternoon.
* IMPACTS...At this level, flooding begins on the most
vulnerable roads in coastal and bayside communities, and along
inland tidal waterways. Some partial or full road closures are
possible.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Do not drive through flooded roadways.
&&
$$1 follow-up statement
312
WHUS41 KPHI 122123
CFWPHI
Coastal Hazard Message
National Weather Service Mount Holly NJ
523 PM EDT Tue Oct 12 2021
DEZ003-004-131030-
/O.EXP.KPHI.CF.Y.0013.000000T0000Z-211012T2100Z/
/O.NEW.KPHI.CF.S.0008.211012T2123Z-211013T1200Z/
Inland Sussex-Delaware Beaches-
523 PM EDT Tue Oct 12 2021
...COASTAL FLOOD ADVISORY HAS EXPIRED...
* WHAT...Up to one foot of inundation above ground level in low-
lying areas near shorelines and tidal waterways.
* WHERE...Little Assawoman Bay and the tidal waterways that flow
into it.
* WHEN...Through Wednesday morning.
* IMPACTS...Minor roadway flooding is possible.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Do not drive through flooded roadways.
&&
Time of high total tides are approximate to the nearest hour.
Delaware Bay at Lewes
MLLW Categories - Minor 6.0 ft, Moderate 7.0 ft, Major 8.0 ft
MHHW Categories - Minor 1.3 ft, Moderate 2.3 ft, Major 3.3 ft
Total Total Departure
Day/Time Tide Tide from Norm Flood
ft MLLW ft MHHW ft Impact
-------- --------- --------- --------- --------
12/02 PM 6.1 1.5 1.1 Minor
13/03 AM 4.9 0.2 1.2 None
13/03 PM 6.1 1.5 1.2 Minor
14/04 AM 4.8 0.2 1.1 None
14/04 PM 5.9 1.2 1.2 None
15/05 AM 5.0 0.3 1.2 None
&&
$$
DEZ002-NJZ021>025-122230-
/O.EXP.KPHI.CF.Y.0013.000000T0000Z-211012T2100Z/
Kent-Cumberland-Atlantic-Cape May-Atlantic Coastal Cape May-
Coastal Atlantic-
523 PM EDT Tue Oct 12 2021
...COASTAL FLOOD ADVISORY HAS EXPIRED...
The tidal levels are falling and will continue to fall through
tonight. Therefore, the coastal flood advisory was allowed expire.
$$
NJZ020-026-131030-
/O.EXP.KPHI.CF.S.0007.000000T0000Z-211012T2100Z/
/O.NEW.KPHI.CF.S.0008.211012T2123Z-211013T1200Z/
Ocean-Coastal Ocean-
523 PM EDT Tue Oct 12 2021
* WHAT...Up to one half foot of inundation above ground level in
low-lying areas near shorelines and tidal waterways.
* WHERE...Barnegat Bay and the tidal waterways that flow into it.
* WHEN...Through Wednesday morning.
* IMPACTS...Minor roadway flooding is possible.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Do not drive through flooded roadways.
&&
Time of high total tides are approximate to the nearest hour.
Barnegat Bay at Barnegat Light
MLLW Categories - Minor 3.5 ft, Moderate 4.5 ft, Major 5.5 ft
MHHW Categories - Minor 1.0 ft, Moderate 2.0 ft, Major 3.0 ft
Total Total Departure
Day/Time Tide Tide from Norm Flood
ft MLLW ft MHHW ft Impact
-------- --------- --------- --------- --------
12/01 PM 3.6 1.1 0.7 Minor
13/02 AM 2.9 0.4 0.8 None
13/03 PM 3.5 1.0 0.8 Minor
14/03 AM 2.8 0.3 0.7 None
14/04 PM 3.5 1.0 0.8 Minor
15/04 AM 2.9 0.4 0.7 None
&&
$$The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 12, 5:23 PM EDT | Coastal Flood Statement | PHI | Sussex | 7 hr |
Nearby
Coastal Flood Advisories in New Jersey, 2021Coastal Flood Advisories in Delaware, 2021Every coastal flood advisory 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.