Alert archive / New Jersey / Special Marine Warnings in 2021

Special Marine Warning 94, NWS Philadelphia/Mount Holly

July 21, 2021

NWS Philadelphia/Mount Holly issued this special marine warning at Jul 21, 2021, 12:46 PM EDT. It was in force for 89 min. 7 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 21, 2021, 12:46 PM EDT (16:46 UTC)
Expired: Jul 21, 2021, 2:15 PM EDT
In force: 89 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 40.0 mph

The radar

The Philadelphia radar (KDIX), 43 km from the middle of the area, began a volume at 16:50 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.

What was reported inside it

Time	Report	Where
Jul 21, 1:00 PM EDT	TSTM WND GST 42	Beach Haven, NJ
Jul 21, 1:05 PM EDT	HAIL 0.25	Barnegat, NJ
Jul 21, 1:15 PM EDT	HAIL 1	Manahawkin, NJ
Jul 21, 1:20 PM EDT	MARINE TSTM WIND 50	Surf City, NJ
Jul 21, 1:42 PM EDT	MARINE TSTM WIND 45	Tuckerton, NJ
Jul 21, 1:50 PM EDT	HAIL 0.75	Manahawkin, NJ
Jul 21, 2:05 PM EDT	HAIL 1.25	Manahawkin, NJ

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 4.8 hours before the alert went out and 177 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: 130 J/kg
Mixed-layer CIN: -165 J/kg
Mixed-layer LCL: 1495 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 48 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

785 
WHUS51 KPHI 211646
SMWPHI
ANZ451-452-211815-
/O.NEW.KPHI.MA.W.0094.210721T1646Z-210721T1815Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
1246 PM EDT Wed Jul 21 2021

The National Weather Service in Mount Holly NJ has issued a

* Special Marine Warning for...
  
Coastal waters from Manasquan Inlet to Great Egg Inlet NJ out 20
nm...

* Until 215 PM EDT.

* At 1245 PM EDT, a strong thunderstorm was located over Barnegat 
  Light, moving northeast at 10 knots. Other thunderstorms were 
  southward around the Little Egg Inlet area and will also approach 
  the Brigantine area.

  HAZARD...Wind gusts to 40 knots and small hail.

  SOURCE...Radar.

  IMPACT...Small craft could be damaged in briefly higher winds and 
           suddenly higher waves.

* Locations impacted include...
  Little Egg Reef, Ship Bottom, Barnegat Light Reef, Garden State
  South Reef, Harvey Cedars, Forked River, Beach Haven, Barnegat
  Light, North Beach Haven, Garden State North Reef, Little Egg
  Inlet, Brigantine and Atlantic City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent lightning is occurring. If caught on the open water, stay 
below deck if possible and keep away from ungrounded metal objects.

&&

LAT...LON 3934 7400 3941 7450 3965 7433 3970 7426
      3975 7426 3986 7418 3989 7373
TIME...MOT...LOC 1645Z 246DEG 10KT 3975 7410 

HAIL...<.75IN
WIND...40KTS

$$

Gorse

1 follow-up statement

406 
FZUS71 KPHI 211713
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
113 PM EDT Wed Jul 21 2021

ANZ451-452-211815-
/O.CON.KPHI.MA.W.0094.000000T0000Z-210721T1815Z/
113 PM EDT Wed Jul 21 2021

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 215 PM EDT...

For the following areas...
Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20
nm...
Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20
nm...

At 111 PM EDT, a severe thunderstorm was located over Harvey Cedars, 
moving east at 15 knots. Another storm was in the vicinity of 
Brigantine to Little Egg inlet. 

HAZARD...Wind gusts to 40 knots and large hail.

SOURCE...Radar indicated.

IMPACT...Small craft could be damaged in briefly higher winds and 
         suddenly higher waves. Large hail could result in 
         structural damage.

Locations impacted include...
Little Egg Reef, Ship Bottom, Barnegat Light Reef, Garden State South
Reef, Harvey Cedars, Forked River, Beach Haven, Barnegat Light, North
Beach Haven, Garden State North Reef, Little Egg Inlet, Brigantine
and Atlantic City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent lightning is occurring. If caught on the open water, stay 
below deck if possible and keep away from ungrounded metal objects.

&&

LAT...LON 3934 7400 3941 7450 3965 7433 3970 7426
      3975 7426 3986 7418 3989 7373
TIME...MOT...LOC 1711Z 262DEG 13KT 3971 7416 

HAIL...>.75IN
WIND...40KTS

$$

Gorse

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 11:09 AM EDT	Special Weather Statement	PHI	Morris	36 min
Jul 21, 12:41 PM EDT	Special Weather Statement	PHI	Ocean	34 min
Jul 21, 12:51 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Ocean	39 min
Jul 21, 12:53 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	67 min
Jul 21, 1:28 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic	47 min
Jul 21, 1:43 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	49 min
Jul 21, 2:10 PM EDT	Special Marine Warning	PHI		95 min
Jul 21, 2:13 PM EDT	Severe Thunderstorm Warning	PHI	Burlington	47 min
Jul 21, 2:35 PM EDT	Special Marine Warning	PHI		55 min
Jul 21, 2:52 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	26 min
Jul 21, 3:04 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	56 min
Jul 21, 3:16 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	44 min
Jul 21, 3:27 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester	33 min
Jul 21, 3:43 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	47 min
Jul 21, 3:48 PM EDT	Special Marine Warning	PHI		57 min
Jul 21, 3:48 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	42 min
Jul 21, 3:57 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester, Salem	33 min
Jul 21, 4:04 PM EDT	Special Marine Warning	PHI		56 min
Jul 21, 4:17 PM EDT	Special Marine Warning	PHI		58 min
Jul 21, 4:50 PM EDT	Special Marine Warning	PHI		55 min
Jul 21, 5:07 PM EDT	Special Marine Warning	PHI		23 min
Jul 21, 5:09 PM EDT	Special Marine Warning	PHI		66 min
Jul 21, 5:24 PM EDT	Special Marine Warning	PHI		46 min
Jul 21, 5:31 PM EDT	Severe Thunderstorm Warning	PHI	Cape May	29 min
Jul 21, 5:52 PM EDT	Special Marine Warning	PHI		53 min
Jul 21, 1:08 PM EDT	Special Weather Statement	PHI	Lehigh	37 min
Jul 21, 1:11 PM EDT	Special Weather Statement	PHI	Northampton	34 min
Jul 21, 1:27 PM EDT	Severe Thunderstorm Warning	PHI	Berks	48 min
Jul 21, 2:03 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh, Northampton	42 min
Jul 21, 2:14 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Delaware, Montgomery	19 min
Jul 21, 2:41 PM EDT	Special Weather Statement	PHI	Montgomery	49 min
Jul 21, 2:48 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery, Philadelphia	42 min
Jul 21, 2:52 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	38 min
Jul 21, 5:59 PM EDT	Special Weather Statement	PHI	Berks	31 min
Jul 21, 4:50 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	25 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.