Alert archive / New Jersey / Coastal Flood Statements in 2020

Coastal Flood Statement 26, NWS Philadelphia/Mount Holly

December 1, 2020Ocean County, New Jersey

NWS Philadelphia/Mount Holly issued this coastal flood statement at Dec 1, 2020, 8:49 AM EST for Ocean County, New Jersey. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued
Dec 1, 2020, 8:49 AM EST (13:49 UTC)
Expired
Dec 1, 2020, 4:00 PM EST
In force
7 hr
Issued by
NWS Philadelphia/Mount Holly

County Ocean County, NJ

The radar

The Philadelphia radar (KDIX), 16 km from the middle of the area, began a volume at 13:52 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, 1.8 hours before the alert went out and 162 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.

Skew-T log-pSkew-T log-p diagram, Brookhaven, NY at 12:00Z on 2020-12-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 31 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2020-12-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 99 square meters per square second.1939587897117136Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
31 J/kg
Mixed-layer CIN
-17 J/kg
Mixed-layer LCL
823 m above ground
0-6 km bulk shear
93 kt
0-1 km storm-relative helicity
99 m²/s²
0-3 km storm-relative helicity
298 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

757 
WHUS41 KPHI 011349
CFWPHI

Coastal Hazard Message
National Weather Service Mount Holly NJ
849 AM EST Tue Dec 1 2020

NJZ020-011700-
/O.NEW.KPHI.CF.S.0026.201201T1349Z-201201T1700Z/
Ocean-
849 AM EST Tue Dec 1 2020

* 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...Until noon EST today.

* IMPACTS...Minor roadway flooding is possible.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Do not drive through flooded roadways.

&&

$$
3 follow-up statements
779 
WHUS41 KPHI 011653
CFWPHI

Coastal Hazard Message
National Weather Service Mount Holly NJ
1153 AM EST Tue Dec 1 2020

NJZ020-012100-
/O.EXT.KPHI.CF.S.0026.000000T0000Z-201201T2100Z/
Ocean-
1153 AM EST Tue Dec 1 2020

...MINOR FLOODING ALONG BARNEGAT BAY...

* 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...Until 4 PM EST this afternoon.

* IMPACTS...Minor roadway flooding is possible.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Do not drive through flooded roadways.

&&

BAH

$$
546 
WHUS41 KPHI 011837
CFWPHI

Coastal Hazard Message
National Weather Service Mount Holly NJ
137 PM EST Tue Dec 1 2020

NJZ015-017>019-PAZ070-071-106-012300-
/O.NEW.KPHI.CF.Y.0036.201201T1837Z-201201T2300Z/
Mercer-Gloucester-Camden-Northwestern Burlington-Delaware-
Philadelphia-Lower Bucks-
137 PM EST Tue Dec 1 2020

...COASTAL FLOOD ADVISORY IN EFFECT UNTIL 6 PM EST THIS EVENING...

* WHAT...Up to one half foot of inundation above ground level in 
  low-lying areas near shorelines and tidal waterways.

* WHERE...In New Jersey, Mercer, Gloucester, Camden and 
  Northwestern Burlington. In Pennsylvania, Delaware, 
  Philadelphia and Lower Bucks.

* WHEN...Until 6 PM EST this evening.

* 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 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 
 --------  ---------  ---------  ---------  --------
 01/03 PM     9.7        2.0       1.9      Minor    
 02/03 AM     7.4       -0.3       0.7       None    
 02/03 PM     8.4        0.7       0.5       None    
 03/04 AM     7.1       -0.6       0.5       None    
 03/04 PM     8.5        0.8       0.6       None    
 04/05 AM     7.1       -0.6       0.6       None

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 
 --------  ---------  ---------  ---------  --------
 01/02 PM     8.6        1.9       2.3      Minor    
 02/03 AM     6.2       -0.5       0.9       None    
 02/03 PM     6.9        0.2       0.6       None    
 03/03 AM     5.5       -1.2       0.3       None    
 03/03 PM     7.0        0.3       0.7       None    
 04/04 AM     6.0       -0.7       0.8       None

&&

$$

NJZ020-012100-
/O.CON.KPHI.CF.S.0026.000000T0000Z-201201T2100Z/
Ocean-
137 PM EST Tue Dec 1 2020

...MINOR FLOODING ALONG BARNEGAT BAY...

* 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...Until 4 PM EST this afternoon.

* IMPACTS...Minor roadway flooding is possible.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Do not drive through flooded roadways.

&&

$$
567 
WHUS41 KPHI 012106
CFWPHI

Coastal Hazard Message
National Weather Service Mount Holly NJ
406 PM EST Tue Dec 1 2020

NJZ015-017>019-PAZ070-071-106-012215-
/O.CAN.KPHI.CF.Y.0036.000000T0000Z-201201T2300Z/
Mercer-Gloucester-Camden-Northwestern Burlington-Delaware-
Philadelphia-Lower Bucks-
406 PM EST Tue Dec 1 2020

...LINGERING MINOR TIDAL FLOODING IS ENDING...

Tide levels continue to decrease on the back bays of New Jersey. 
The lingering minor flooding is coming to an end.


$$

NJZ020-012215-
/O.EXP.KPHI.CF.S.0026.000000T0000Z-201201T2100Z/
Ocean-
406 PM EST Tue Dec 1 2020

...COASTAL FLOOD ADVISORY IS CANCELLED...

Tide levels continue to decrease. As a result, the Coastal Flood 
Advisory has been cancelled for the tidal Delaware River and its 
tributaries.

$$

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Nov 30, 7:48 PM ESTCoastal Flood StatementPHIOcean8 hr
Dec 1, 6:31 AM ESTRiver Flood WarningPHISomerset20 hr
Dec 1, 7:18 AM ESTRiver Flood WarningPHIMiddlesex, Somerset3 hr
Dec 1, 12:26 PM ESTRiver Flood WarningPHIMorris7 hr
Dec 1, 1:37 PM ESTCoastal Flood AdvisoryPHIBurlington, Camden, Gloucester, Mercer2 hr

Nearby

Coastal Flood Statements in New Jersey, 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.