Alert archive / New Jersey / Coastal Flood Statements in 2020
Coastal Flood Statement 16, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this coastal flood statement at Aug 17, 2020, 11:51 PM EDT for Ocean County, New Jersey; Sussex County, Delaware. It took effect at Aug 18, 2020, 12:00 AM EDT. It was in force for 4 hr.
The area
The counties it named.
The facts
- Issued
- Aug 17, 2020, 11:51 PM EDT (03:51 UTC)
- In effect from
- Aug 18, 2020, 12:00 AM EDT
- Expired
- Aug 18, 2020, 4:00 AM EDT
- In force
- 4 hr
- Issued by
- NWS Philadelphia/Mount Holly
Counties Sussex County, DE, Ocean County, NJ
The radar
The Dover AFB radar (KDOX), 75 km from the middle of the area, began a volume at 03:53 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, 3.9 hours before the alert went out and 158 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
- 5 J/kg
- Mixed-layer CIN
- -136 J/kg
- Mixed-layer LCL
- 1064 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 23 m²/s²
- 0-3 km storm-relative helicity
- 24 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
830
WHUS41 KPHI 180351
CFWPHI
Coastal Hazard Message
National Weather Service Mount Holly NJ
1151 PM EDT Mon Aug 17 2020
NJZ020-026-180800-
/O.EXP.KPHI.CF.Y.0021.000000T0000Z-200818T0400Z/
/O.NEW.KPHI.CF.S.0016.200818T0400Z-200818T0800Z/
Ocean-Coastal Ocean-
1151 PM EDT Mon Aug 17 2020
...COASTAL FLOOD ADVISORY WILL EXPIRE AT MIDNIGHT EDT TONIGHT...
...LINGERING MINOR FLOODING ALONG BARNEGAT BAY OVERNIGHT...
* WHAT...Up to a half foot of inundation above ground level is
expected in low-lying areas near shorelines and tidal waterways.
* WHERE...Barnegat Bay and the tidal waterways that flow into it.
* WHEN...Until 4:00 AM Monday.
* IMPACTS...Minor roadway flooding is possible.
&&
$$
DEZ003-004-180800-
/O.EXP.KPHI.CF.Y.0021.000000T0000Z-200818T0400Z/
/O.NEW.KPHI.CF.S.0016.200818T0400Z-200818T0800Z/
Inland Sussex-Delaware Beaches-
1151 PM EDT Mon Aug 17 2020
...COASTAL FLOOD ADVISORY WILL EXPIRE AT MIDNIGHT EDT TONIGHT...
...LINGERING MINOR FLOODING ALONG LITTLE ASSAWOMAN BAY
OVERNIGHT...
* WHAT...Up to a half foot of inundation above ground level is
expected in low-lying areas near shorelines and tidal waterways.
* WHERE...Little Assawoman Bay and the tidal waterways that flow
into it.
* WHEN...Until 4:00 AM Monday.
* IMPACTS...Minor roadway flooding is possible.
&&
$$
NJZ012>014-027-180500-
/O.EXP.KPHI.CF.Y.0021.000000T0000Z-200818T0400Z/
Middlesex-Western Monmouth-Eastern Monmouth-
Southeastern Burlington-
1151 PM EDT Mon Aug 17 2020
...COASTAL FLOOD ADVISORY WILL EXPIRE AT MIDNIGHT EDT TONIGHT...
Water levels will continue to decrease overnight. The Coastal
Flood Advisory will expire at midnight.
$$
NJZ021>025-180500-
/O.EXP.KPHI.CF.Y.0021.000000T0000Z-200818T0400Z/
Cumberland-Atlantic-Cape May-Atlantic Coastal Cape May-
Coastal Atlantic-
1151 PM EDT Mon Aug 17 2020
...COASTAL FLOOD ADVISORY WILL EXPIRE AT MIDNIGHT EDT TONIGHT...
Water levels will continue to decrease overnight. The Coastal
Flood Advisory will expire at midnight.
$$
DEZ002-180500-
/O.EXP.KPHI.CF.Y.0021.000000T0000Z-200818T0400Z/
Kent-
1151 PM EDT Mon Aug 17 2020
...COASTAL FLOOD ADVISORY WILL EXPIRE AT MIDNIGHT EDT TONIGHT...
Water levels will continue to decrease overnight. The Coastal
Flood Advisory will expire at midnight.
$$
DEZ001-NJZ016-180500-
/O.CON.KPHI.CF.Y.0021.000000T0000Z-200818T0500Z/
New Castle-Salem-
1151 PM EDT Mon Aug 17 2020
...COASTAL FLOOD ADVISORY REMAINS IN EFFECT UNTIL 1 AM EDT
TUESDAY...
* WHAT...Up to one half foot of inundation above ground level in
low-lying areas near shorelines and tidal waterways.
* WHERE...In New Jersey, Salem. In Delaware, New Castle.
* WHEN...Until 1 AM EDT Tuesday.
* IMPACTS...At this level, flooding begins on the most
vulnerable roads along tidal waterways. Some partial or full
road closures are possible.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Coastal Flood Advisory means that minor tidal flooding is
expected. Minor tidal flooding often results in some road
closures. Usually, the most vulnerable roadways will flood.
Do not leave your vehicle at a location that is prone to tidal
flooding. Do not drive your vehicle through flood waters. The
water may be deeper than you think it is. You will be putting
yourself in danger and your vehicle may be damaged, leading to
costly repairs.
Visit the Advanced Hydrologic Prediction Service at
water.weather.gov/ahps for additional water level and flood
impact information for your local tide gauge.
&&
Time of high total tides are approximate to the nearest hour.
Delaware River at Reedy Point
MLLW Categories - Minor 7.2 ft, Moderate 8.2 ft, Major 9.2 ft
MHHW Categories - Minor 1.4 ft, Moderate 2.4 ft, Major 3.4 ft
Total Total Departure
Day/Time Tide Tide from Norm Flood
ft MLLW ft MHHW ft Impact
-------- --------- --------- --------- --------
17/11 PM 7.6 1.8 1.0 Minor
18/11 AM 5.8 -0.0 0.2 None
19/12 AM 6.8 1.0 0.1 None
19/12 PM 6.0 0.2 0.2 None
20/12 AM 7.0 1.2 0.2 None
20/01 PM 6.1 0.3 0.1 None
&&
$$
NJZ017>019-PAZ070-071-106-180800-
/O.CON.KPHI.CF.Y.0021.000000T0000Z-200818T0800Z/
Gloucester-Camden-Northwestern Burlington-Delaware-Philadelphia-
Lower Bucks-
1151 PM EDT Mon Aug 17 2020
...COASTAL FLOOD ADVISORY REMAINS IN EFFECT UNTIL 4 AM EDT
TUESDAY...
* WHAT...Up to one half foot of inundation above ground level
expected in low-lying areas near shorelines and tidal
waterways.
* WHERE...In Pennsylvania, Delaware, Philadelphia and Lower
Bucks. In New Jersey, Gloucester, Northwestern Burlington and
Camden.
* WHEN...Until 4 AM EDT Tuesday.
* IMPACTS...At this level, flooding begins on the most
vulnerable roads along 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 River at Philadelphia
MLLW Categories - Minor 8.2 ft, Moderate 9.2 ft, Major 10.2 ft
MHHW Categories - Minor 1.5 ft, Moderate 2.5 ft, Major 3.5 ft
Total Total Departure
Day/Time Tide Tide from Norm Flood
ft MLLW ft MHHW ft Impact
-------- --------- --------- --------- --------
18/01 AM 8.6 1.9 1.3 Minor
18/02 PM 6.9 0.2 0.7 None
19/02 AM 8.0 1.3 0.6 None
19/03 PM 6.9 0.2 0.5 None
20/03 AM 7.9 1.2 0.5 None
Delaware River at Burlington
MLLW Categories - Minor 9.3 ft, Moderate 10.3 ft, Major 11.3 ft
MHHW Categories - Minor 1.6 ft, Moderate 2.6 ft, Major 3.6 ft
Total Total Departure
Day/Time Tide Tide from Norm Flood
ft MLLW ft MHHW ft Impact
-------- --------- --------- --------- --------
18/02 AM 9.7 2.0 1.5 Minor
18/03 PM 8.1 0.4 0.9 None
19/03 AM 9.2 1.5 0.8 None
19/04 PM 8.2 0.5 0.7 None
20/04 AM 9.2 1.5 0.7 None
&&
$$2 follow-up statements
539
WHUS41 KPHI 180521
CFWPHI
Coastal Hazard Message
National Weather Service Mount Holly NJ
121 AM EDT Tue Aug 18 2020
DEZ001-NJZ016-180630-
/O.EXP.KPHI.CF.Y.0021.000000T0000Z-200818T0500Z/
New Castle-Salem-
121 AM EDT Tue Aug 18 2020
...COASTAL FLOOD ADVISORY HAS EXPIRED...
Water levels will continue to decrease overnight. The Coastal
Flood Advisory was allowed to expire at 1 am.
$$
NJZ017>019-PAZ070-071-106-180800-
/O.CON.KPHI.CF.Y.0021.000000T0000Z-200818T0800Z/
Gloucester-Camden-Northwestern Burlington-Delaware-Philadelphia-
Lower Bucks-
121 AM EDT Tue Aug 18 2020
...COASTAL FLOOD ADVISORY REMAINS IN EFFECT UNTIL 4 AM EDT EARLY
THIS MORNING...
* WHAT...Up to one half foot of inundation above ground level
expected in low-lying areas near shorelines and tidal
waterways.
* WHERE...In Pennsylvania, Delaware, Philadelphia and Lower
Bucks. In New Jersey, Gloucester, Northwestern Burlington and
Camden.
* WHEN...Until 4 AM EDT Tuesday.
* IMPACTS...At this level, flooding begins on the most
vulnerable roads along 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 River at Philadelphia
MLLW Categories - Minor 8.2 ft, Moderate 9.2 ft, Major 10.2 ft
MHHW Categories - Minor 1.5 ft, Moderate 2.5 ft, Major 3.5 ft
Total Total Departure
Day/Time Tide Tide from Norm Flood
ft MLLW ft MHHW ft Impact
-------- --------- --------- --------- --------
18/01 AM 8.6 1.9 1.3 Minor
18/02 PM 6.9 0.2 0.7 None
19/02 AM 8.0 1.3 0.6 None
19/03 PM 6.9 0.2 0.5 None
20/03 AM 7.9 1.2 0.5 None
Delaware River at Burlington
MLLW Categories - Minor 9.3 ft, Moderate 10.3 ft, Major 11.3 ft
MHHW Categories - Minor 1.6 ft, Moderate 2.6 ft, Major 3.6 ft
Total Total Departure
Day/Time Tide Tide from Norm Flood
ft MLLW ft MHHW ft Impact
-------- --------- --------- --------- --------
17/03 PM 8.1 0.4 1.7 None
18/02 AM 9.7 2.0 1.5 Minor
18/03 PM 8.1 0.4 0.9 None
19/03 AM 9.2 1.5 0.8 None
19/04 PM 8.2 0.5 0.7 None
20/04 AM 9.2 1.5 0.7 None
&&
$$
DEZ003-004-NJZ020-026-180800-
/O.CON.KPHI.CF.S.0016.000000T0000Z-200818T0800Z/
Inland Sussex-Delaware Beaches-Ocean-Coastal Ocean-
121 AM EDT Tue Aug 18 2020
...LINGERING MINOR FLOODING ALONG BARNEGAT BAY AND LITTLE
ASSAWOMAN BAY OVERNIGHT...
* WHAT...Up to a half foot of inundation above ground level is
expected in low-lying areas near shorelines and tidal waterways.
* WHERE...Barnegat Bay and Little Assawoman Bay and the tidal
waterways that flow into it.
* WHEN...Until 4:00 AM Monday.
* IMPACTS...Minor roadway flooding is possible.&&
$$522 WHUS41 KPHI 180753 CFWPHI Coastal Hazard Message National Weather Service Mount Holly NJ 353 AM EDT Tue Aug 18 2020 NJZ017>019-PAZ070-071-106-180900- /O.EXP.KPHI.CF.Y.0021.000000T0000Z-200818T0800Z/ Gloucester-Camden-Northwestern Burlington-Delaware-Philadelphia- Lower Bucks- 353 AM EDT Tue Aug 18 2020 ...COASTAL FLOOD ADVISORY WILL EXPIRE AT 4 AM EDT EARLY THIS MORNING... Water levels will continue to decrease early this morning. The Coastal Flood Advisory will expire at 4:00 AM. $$ DEZ003-004-NJZ020-026-180900- /O.EXP.KPHI.CF.S.0016.000000T0000Z-200818T0800Z/ Inland Sussex-Delaware Beaches-Ocean-Coastal Ocean- 353 AM EDT Tue Aug 18 2020 ...LINGERING MINOR FLOODING ALONG BARNEGAT BAY AND LITTLE ASSAWOMAN BAY HAS ENDED... Water levels will continue to decrease early this morning. The lingering minor flooding along Barnegat Bay and Little Assawoman Bay and the tidal waterways that flow into it has ended. $$
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 12:31 AM EDT | Tornado Warning | PHI | Warren | 29 min |
| Aug 18, 12:39 AM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Sussex, Warren | 66 min |
| Aug 18, 12:58 AM EDT | Special Weather Statement | PHI | Hunterdon | 47 min |
| Aug 18, 1:13 AM EDT | Areal Flood Advisory | PHI | Hunterdon, Middlesex, Morris, Somerset, Sussex, Warren | 2 hr |
| Aug 18, 1:38 AM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Middlesex, Morris, Somerset, Sussex, Warren | 37 min |
| Aug 18, 2:15 AM EDT | Special Weather Statement | PHI | Hunterdon, Morris, Somerset | 30 min |
Nearby
Coastal Flood Statements in New Jersey, 2020Coastal Flood Statements in Delaware, 2020Every coastal flood statement in 2020
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.