Alert archive / New Jersey / Special Marine Warnings in 2021

Special Marine Warning 77, NWS Philadelphia/Mount Holly

July 9, 2021

NWS Philadelphia/Mount Holly issued this special marine warning at Jul 9, 2021, 1:34 AM EDT. It was in force for 86 min. 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 9, 2021, 1:34 AM EDT (05:34 UTC)
Expired
Jul 9, 2021, 3:00 AM EDT
In force
86 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
0.0 in
Wind
49.0 mph

The radar

The Philadelphia radar (KDIX), 116 km from the middle of the area, began a volume at 05:34 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, 5.6 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, Wallops Is Stn, VA at 00:00Z on 2021-07-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 440 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Wallops Is Stn, VA at 00:00Z on 2021-07-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 151 square meters per square second.19395878Sfc1 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
440 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
675 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
151 m²/s²
0-3 km storm-relative helicity
336 m²/s²
Significant tornado parameter
0.3
Supercell composite
3.3

Open this sounding in Storm Lab

The text

As transmitted.

514 
WHUS51 KPHI 090534
SMWPHI
ANZ452-453-472-473-090700-
/O.NEW.KPHI.MA.W.0077.210709T0534Z-210709T0700Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
134 AM EDT Fri Jul 9 2021

The National Weather Service in Mount Holly NJ has issued a

* Special Marine Warning for...
  
Coastal and outer waters from Little Egg Inlet to Cape May NJ...

* Until 300 AM EDT.

* At 133 AM EDT, thunderstorms capable of producing waterspouts were 
  located along a line extending from near Buoy 2ms to 21 nm 
  southeast of Five Fathoms Buoy, moving northeast at 30 knots.

  HAZARD...Waterspouts and wind gusts to nearly 50 knots.

  SOURCE...Radar.

  IMPACT...Waterspouts can easily overturn boats and create locally 
           hazardous seas. Small craft could be damaged in briefly 
           higher winds and suddenly higher waves.

* Locations impacted include...
  Buoy 2fb, Buoy 3fb, Great Egg Inlet, Deepwater Reef, Great Egg
  Reef, Ocean City Reef, Wildwood, The Lump, 28-
  Mile Wreck, Buoy Ge, Cape May Reef, Sea Isle City and Wildwood
  Reef.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Thunderstorms can produce sudden waterspouts. Waterspouts can easily
overturn boats and create locally hazardous seas. Seek safe harbor
immediately.

&&

LAT...LON 3897 7374 3888 7386 3879 7395 3875 7402
      3872 7408 3895 7494 3936 7458 3906 7367
TIME...MOT...LOC 0533Z 211DEG 30KT 3887 7489 3861 7417 

WATERSPOUT...POSSIBLE
HAIL...0.00IN
WIND...49KTS

$$

BAH
2 follow-up statements
073 
FZUS71 KPHI 090623
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
223 AM EDT Fri Jul 9 2021

ANZ452-453-472-473-090700-
/O.CON.KPHI.MA.W.0077.000000T0000Z-210709T0700Z/
223 AM EDT Fri Jul 9 2021

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 300 AM EDT...

For the following areas...
Coastal waters from Great Egg Inlet to Cape May NJ out 20 nm...
Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20
nm...
Waters from Great Egg Inlet NJ to Cape May NJ out 20 to 40 nm...
Waters from Little Egg Inlet NJ to Great Egg Inlet NJ out 20 to 40 nm
from 20 to 40 NM...

At 222 AM EDT, thunderstorms capable of producing waterspouts were 
located along a line extending from near Buoy Ge to 13 nm east of 
Deepwater Reef, moving northeast at 30 knots.

HAZARD...Waterspouts and wind gusts to nearly 50 knots.

SOURCE...Radar indicated.

IMPACT...Waterspouts can easily overturn boats and create locally 
         hazardous seas. Small craft could be damaged in briefly 
         higher winds and suddenly higher waves.

Locations impacted include...
The Lump, 28-
Mile Wreck, Buoy Ge, Great Egg Inlet, Sea Isle City, Deepwater Reef,
Great Egg Reef, Ocean City Reef and Buoy 2fb.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Thunderstorms can produce sudden waterspouts. Waterspouts can easily
overturn boats and create locally hazardous seas. Seek safe harbor
immediately.

&&

LAT...LON 3895 7377 3876 7400 3908 7483 3936 7458
      3906 7367
TIME...MOT...LOC 0622Z 211DEG 30KT 3922 7462 3896 7390 

WATERSPOUT...POSSIBLE
HAIL...0.00IN
WIND...49KTS

$$

BAH
967 
FZUS71 KPHI 090635
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
235 AM EDT Fri Jul 9 2021

ANZ452-453-472-473-090700-
/O.CON.KPHI.MA.W.0077.000000T0000Z-210709T0700Z/
235 AM EDT Fri Jul 9 2021

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 300 AM EDT...

For the following areas...
Coastal waters from Great Egg Inlet to Cape May NJ out 20 nm...
Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20
nm...
Waters from Great Egg Inlet NJ to Cape May NJ out 20 to 40 nm...
Waters from Little Egg Inlet NJ to Great Egg Inlet NJ out 20 to 40 nm
from 20 to 40 NM...

At 235 AM EDT, severe thunderstorms capable of producing waterspouts
were located along a line extending from Great Egg Inlet to 17 nm
east of Deepwater Reef, moving northeast at 30 knots.

HAZARD...Waterspouts and wind gusts to nearly 50 knots.

SOURCE...Radar indicated.

IMPACT...Waterspouts can easily overturn boats and create locally 
         hazardous seas. Small craft could be damaged in briefly 
         higher winds and suddenly higher waves.

Locations impacted include...
The Lump, Buoy Ge, Great Egg Inlet, Sea Isle City, Deepwater Reef,
Great Egg Reef, Ocean City Reef and 28-Mile Wreck.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Thunderstorms can produce sudden waterspouts. Waterspouts can easily
overturn boats and create locally hazardous seas. Seek safe harbor
immediately.

&&

LAT...LON 3894 7378 3884 7390 3914 7477 3936 7458
      3906 7367
TIME...MOT...LOC 0635Z 211DEG 30KT 3930 7456 3904 7384 

WATERSPOUT...POSSIBLE
HAIL...0.00IN
WIND...49KTS

$$

BAH

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 8, 10:25 PM EDTAreal Flood AdvisoryPHICape May, Cumberland7 hr
Jul 8, 11:02 PM EDTSpecial Marine WarningPHI88 min
Jul 8, 11:59 PM EDTAreal Flood AdvisoryPHISalem5 hr
Jul 9, 12:07 AM EDTSpecial Marine WarningPHI53 min
Jul 9, 12:08 AM EDTAreal Flood AdvisoryPHIAtlantic, Camden, Gloucester6 hr
Jul 9, 12:25 AM EDTSpecial Marine WarningPHI95 min
Jul 9, 1:49 AM EDTSpecial Marine WarningPHI26 min
Jul 9, 2:05 AM EDTAreal Flood AdvisoryPHIBurlington, Monmouth, Ocean8 hr
Jul 9, 2:50 AM EDTTornado WarningPHIAtlantic, Cape May, Cumberland25 min
Jul 9, 2:53 AM EDTSpecial Marine WarningPHI68 min
Jul 9, 3:38 AM EDTTornado WarningPHIAtlantic, Burlington, Ocean18 min
Jul 9, 3:51 AM EDTSpecial Marine WarningPHI84 min
Jul 9, 4:08 AM EDTGale WarningPHI3 hr
Jul 9, 4:41 AM EDTTornado WarningPHIMonmouth, Ocean34 min
Jul 9, 4:44 AM EDTAreal Flood AdvisoryPHIMercer, Middlesex5 hr
Jul 9, 4:54 AM EDTAreal Flood AdvisoryPHIMorris, Somerset5 hr
Jul 9, 4:58 AM EDTSpecial Marine WarningPHI39 min
Jul 9, 5:34 PM EDTAreal Flood AdvisoryPHISussex, Warren2 hr
Jul 9, 6:19 PM EDTSevere Thunderstorm WarningPHISalem41 min
Jul 9, 6:24 PM EDTSpecial Marine WarningPHI66 min
Jul 9, 6:50 PM EDTAreal Flood AdvisoryPHIGloucester, Salem2 hr
Jul 9, 6:57 PM EDTSevere Thunderstorm WarningPHICumberland, Gloucester, Salem63 min
Jul 9, 7:17 PM EDTSevere Thunderstorm WarningPHICamden, Gloucester23 min
Jul 9, 7:39 PM EDTAreal Flood AdvisoryPHIHunterdon, Morris, Sussex, Warren2 hr
Jul 9, 7:43 PM EDTSevere Thunderstorm WarningPHIAtlantic, Camden, Cape May, Cumberland, Gloucester, Salem62 min
Jul 9, 7:46 PM EDTAreal Flood AdvisoryPHIAtlantic, Camden, Cumberland, Gloucester, Salem108 min
Jul 9, 5:17 PM EDTSevere Thunderstorm WarningPHIChester, Delaware43 min
Jul 9, 6:55 PM EDTSpecial Weather StatementPHICarbon35 min
Jul 9, 7:07 PM EDTAreal Flood AdvisoryPHICarbon, Lehigh, Monroe, Northampton3 hr
Jul 9, 7:31 PM EDTSpecial Weather StatementPHINorthampton29 min
Jul 8, 10:19 PM EDTAreal Flood AdvisoryPHIKent, Sussex5 hr
Jul 8, 11:37 PM EDTTornado WarningPHISussex23 min
Jul 8, 11:59 PM EDTTornado WarningPHISussex12 min
Jul 9, 12:04 AM EDTTornado WarningPHISussex26 min
Jul 9, 12:11 AM EDTTornado WarningPHISussex35 min
Jul 9, 12:28 AM EDTTornado WarningPHISussex17 min
Jul 9, 4:54 PM EDTSpecial Weather StatementPHINew Castle66 min

Nearby

Special Marine Warnings in New Jersey, 2021Every special marine 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.