Alert archive / New Jersey / Special Marine Warnings in 2021

Special Marine Warning 20, NWS Philadelphia/Mount Holly

May 8, 2021

NWS Philadelphia/Mount Holly issued this special marine warning at May 8, 2021, 5:22 PM EDT. It was in force for 53 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: May 8, 2021, 5:22 PM EDT (21:22 UTC)
Expired: May 8, 2021, 6:15 PM EDT
In force: 53 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 34.0 mph

The radar

The Dover AFB radar (KDOX), 86 km from the middle of the area, began a volume at 21:25 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 12:00Z, 9.4 hours before the alert went out and 111 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1134 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 47 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

178 
WHUS51 KPHI 082122
SMWPHI
ANZ453-454-473-475-082215-
/O.NEW.KPHI.MA.W.0020.210508T2122Z-210508T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
522 PM EDT Sat May 8 2021

The National Weather Service in Mount Holly NJ has issued a

* Special Marine Warning for...
  
Coastal waters from Great Egg Inlet NJ to Cape Henlopen DE out 20
nm...
Outer waters from Great Egg Inlet NJ to Fenwick Island DE out 20 to
40 nm...

* Until 615 PM EDT.

* At 521 PM EDT, a shower capable of producing waterspouts was
  located near Buoy 4fb, moving east at 40 knots.

  HAZARD...Waterspouts, wind gusts 34 knots or greater, and small 
           hail.

  SOURCE...Radar.

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

* Locations impacted include...
  Five Fathoms Buoy, Buoy 4fb, Buoy 3fb and Cape May Reef. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor until hazardous weather passes.

&&

LAT...LON 3853 7468 3861 7472 3865 7472 3866 7475
      3881 7483 3896 7472 3875 7401 3870 7415
      3861 7417 3851 7426 3837 7427 3834 7431
TIME...MOT...LOC 2121Z 289DEG 41KT 3880 7469 

WATERSPOUT...POSSIBLE
HAIL...<.75IN
WIND...>34KTS

$$

SFJ

2 follow-up statements

312 
FZUS71 KPHI 082143
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
543 PM EDT Sat May 8 2021

ANZ453-454-473-475-082215-
/O.CON.KPHI.MA.W.0020.000000T0000Z-210508T2215Z/
543 PM EDT Sat May 8 2021

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 615 PM EDT...

For the following areas...
Coastal waters from Cape May NJ to Cape Henlopen DE out 20 nm...
Coastal waters from Great Egg Inlet to Cape May NJ out 20 nm...
Waters from Cape May NJ to Fenwick Island DE out 20 to 40 nm...
Waters from Great Egg Inlet NJ to Cape May NJ out 20 to 40 nm...

At 543 PM EDT, a shower capable of producing waterspouts was located
7 nm southeast of Five Fathoms Buoy, moving east at 35 knots.

HAZARD...Waterspouts, wind gusts 34 knots or greater, and small 
         hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Buoy 4fb and Five Fathoms Buoy. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

Move to safe harbor until hazardous weather passes.

&&

LAT...LON 3852 7466 3875 7465 3891 7455 3875 7401
      3870 7415 3861 7417 3851 7426 3837 7427
      3834 7431
TIME...MOT...LOC 2143Z 289DEG 37KT 3872 7442 

WATERSPOUT...POSSIBLE
HAIL...<.75IN
WIND...>34KTS

$$

SFJ

969 
FZUS71 KPHI 082205
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
605 PM EDT Sat May 8 2021

ANZ453-454-473-475-082215-
/O.EXP.KPHI.MA.W.0020.000000T0000Z-210508T2215Z/
605 PM EDT Sat May 8 2021

...THE SPECIAL MARINE WARNING WILL EXPIRE AT 615 PM EDT...

The affected areas were... 

Coastal waters from Great Egg Inlet NJ to Cape Henlopen DE out 20
nm...
Outer waters from Great Egg Inlet NJ to Fenwick Island DE out 20 to
40 nm...

The shower has weakened and no longer poses a significant threat to
boaters.

LAT...LON 3852 7466 3875 7465 3891 7455 3875 7401
      3870 7415 3861 7417 3851 7426 3837 7427
      3834 7431
TIME...MOT...LOC 2205Z 289DEG 41KT 3864 7412 

$$

SFJ

The office that day

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

Issued	Product	Office	Counties	Lasted
May 8, 11:22 AM EDT	Special Weather Statement	PHI	Monmouth	38 min
May 8, 1:12 PM EDT	Special Weather Statement	PHI	Monmouth	33 min
May 8, 1:15 PM EDT	Areal Flood Advisory	PHI	Middlesex, Monmouth	58 min
May 8, 1:45 PM EDT	Special Weather Statement	PHI	Ocean	15 min
May 8, 2:01 PM EDT	Special Weather Statement	PHI	Ocean	14 min
May 8, 2:34 PM EDT	Small Craft Advisory	PHI		7 hr
May 8, 2:42 PM EDT	Special Weather Statement	PHI	Middlesex, Monmouth, Morris	48 min
May 8, 2:47 PM EDT	Special Marine Warning	PHI		31 min
May 8, 3:04 PM EDT	Special Weather Statement	PHI	Salem	26 min
May 8, 3:23 PM EDT	Special Weather Statement	PHI	Salem	37 min
May 8, 3:43 PM EDT	Special Marine Warning	PHI		62 min
May 8, 3:46 PM EDT	Special Weather Statement	PHI	Somerset	29 min
May 8, 3:53 PM EDT	Special Marine Warning	PHI		56 min
May 8, 4:01 PM EDT	Special Marine Warning	PHI		48 min
May 8, 4:16 PM EDT	Special Weather Statement	PHI	Cumberland	29 min
May 8, 4:21 PM EDT	Special Weather Statement	PHI	Hunterdon, Middlesex, Somerset	24 min
May 8, 4:28 PM EDT	Special Marine Warning	PHI		62 min
May 8, 4:46 PM EDT	Special Weather Statement	PHI	Hunterdon, Mercer, Middlesex, Somerset	29 min
May 8, 3:39 PM EDT	Special Weather Statement	PHI	Kent	36 min
May 8, 3:54 PM EDT	Special Weather Statement	PHI	Sussex	36 min
May 8, 4:15 PM EDT	Special Weather Statement	PHI	Sussex	30 min
May 8, 4:33 PM EDT	Special Weather Statement	PHI	Sussex	27 min
May 8, 5:56 PM EDT	Special Weather Statement	PHI	Kent	34 min

Nearby

Special Marine Warnings in New Jersey, 2021 Every 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.