Alert archive / New Jersey / Special Marine Warnings in 2021

Special Marine Warning 82, NWS Philadelphia/Mount Holly

July 9, 2021

NWS Philadelphia/Mount Holly issued this special marine warning at Jul 9, 2021, 6:24 PM EDT. It was in force for 66 min. 1 report 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 9, 2021, 6:24 PM EDT (22:24 UTC)
Expired: Jul 9, 2021, 7:30 PM EDT
In force: 66 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 49.0 mph

The radar

The Dover AFB radar (KDOX), 75 km from the middle of the area, began a volume at 22:26 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	Remark
Jul 9, 6:55 PM EDT	MARINE TSTM WIND 40	4 Ssw Elsinboro Twp, NJ	GUST MEASURED AT NJ WXNET SITE AT LOWER ALLOWAYS CREEK.

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

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 10.4 hours before the alert went out and 174 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: 712 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

924 
WHUS51 KPHI 092224
SMWPHI
ANZ430-092330-
/O.NEW.KPHI.MA.W.0082.210709T2224Z-210709T2330Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Special Marine Warning for...
  Upper Delaware Bay...

* Until 730 PM EDT.

* At 624 PM EDT, a severe thunderstorm was located 8 nm west of Pea
  Patch Island, moving east at 25 knots.

  HAZARD...Wind gusts to nearly 50 knots and large hail.

  SOURCE...Radar.

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

* Locations impacted include...
  Fortesque Beach, Sea Breeze, Pea Patch Island, Woodland Beach,
  Stony Point, Ship John Shoal Light and Reedy Point.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Boaters should seek safe harbor immediately until this storm passes.
Wind gusts to nearly 50 knots, large hail, high waves, dangerous
lightning, and heavy rain are possible with this storm.

&&

LAT...LON 3968 7562 3973 7558 3974 7545 3969 7544
      3961 7535 3951 7539 3948 7533 3943 7534
      3943 7529 3946 7525 3946 7520 3939 7517
      3935 7518 3932 7513 3922 7515 3933 7557
      3940 7562
TIME...MOT...LOC 2224Z 268DEG 27KT 3963 7575 

HAIL...>.75IN
WIND...49KTS

$$

Staarmann

2 follow-up statements

223 
FZUS71 KPHI 092303
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
703 PM EDT Fri Jul 9 2021

ANZ430-092330-
/O.CON.KPHI.MA.W.0082.000000T0000Z-210709T2330Z/
703 PM EDT Fri Jul 9 2021

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 730 PM EDT...

For the following areas...
Delaware Bay waters north of East Point NJ to Slaughter Beach DE...

At 646 PM EDT, the Wilmington Airport reported a 39 kt wind gust 
with a line of severe thunderstorms. This line of storms was located 
along a line extending from 10 nm northeast of Pea Patch Island to 
near Reedy Point, moving east at 25 knots.

HAZARD...Wind gusts to nearly 50 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...
Fortesque Beach, Sea Breeze, Pea Patch Island, Woodland Beach, Stony
Point, Ship John Shoal Light and Reedy Point.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Boaters should seek safe harbor immediately until these storms pass.
Wind gusts to nearly 50 knots, large hail, high waves, dangerous
lightning, and heavy rain are possible with these storms.

&&

LAT...LON 3968 7562 3973 7558 3974 7545 3969 7544
      3961 7535 3951 7539 3948 7533 3943 7534
      3943 7529 3946 7525 3946 7520 3939 7517
      3935 7518 3932 7513 3922 7515 3933 7557
      3940 7562
TIME...MOT...LOC 2301Z 274DEG 23KT 3972 7542 3958 7551 3952 7567 

HAIL...>.75IN
WIND...49KTS

$$

Staarmann

957 
FZUS71 KPHI 092321
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
721 PM EDT Fri Jul 9 2021

ANZ430-092330-
/O.CON.KPHI.MA.W.0082.000000T0000Z-210709T2330Z/
721 PM EDT Fri Jul 9 2021

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 730 PM EDT...

For the following areas...
Delaware Bay waters north of East Point NJ to Slaughter Beach DE...

At 720 PM EDT, strong thunderstorms were located along a line
extending from 13 nm east of Pea Patch Island to 6 nm northeast of
Stony Point to near Reedy Point, moving east at 25 knots.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Fortesque Beach, Sea Breeze, Pea Patch Island, Woodland Beach, Stony
Point, Ship John Shoal Light and Reedy Point.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor until hazardous weather passes.

&&

LAT...LON 3968 7562 3973 7558 3974 7545 3969 7544
      3961 7535 3951 7539 3948 7533 3943 7534
      3943 7529 3946 7525 3946 7520 3939 7517
      3935 7518 3932 7513 3922 7515 3933 7557
      3940 7562
TIME...MOT...LOC 2320Z 276DEG 25KT 3964 7528 3951 7538 3949 7562 

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

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 10:25 PM EDT	Areal Flood Advisory	PHI	Cape May, Cumberland	7 hr
Jul 8, 11:02 PM EDT	Special Marine Warning	PHI		88 min
Jul 8, 11:59 PM EDT	Areal Flood Advisory	PHI	Salem	5 hr
Jul 9, 12:07 AM EDT	Special Marine Warning	PHI		53 min
Jul 9, 12:08 AM EDT	Areal Flood Advisory	PHI	Atlantic, Camden, Gloucester	6 hr
Jul 9, 12:25 AM EDT	Special Marine Warning	PHI		95 min
Jul 9, 1:34 AM EDT	Special Marine Warning	PHI		86 min
Jul 9, 1:49 AM EDT	Special Marine Warning	PHI		26 min
Jul 9, 2:05 AM EDT	Areal Flood Advisory	PHI	Burlington, Monmouth, Ocean	8 hr
Jul 9, 2:50 AM EDT	Tornado Warning	PHI	Atlantic, Cape May, Cumberland	25 min
Jul 9, 2:53 AM EDT	Special Marine Warning	PHI		68 min
Jul 9, 3:38 AM EDT	Tornado Warning	PHI	Atlantic, Burlington, Ocean	18 min
Jul 9, 3:51 AM EDT	Special Marine Warning	PHI		84 min
Jul 9, 4:08 AM EDT	Gale Warning	PHI		3 hr
Jul 9, 4:41 AM EDT	Tornado Warning	PHI	Monmouth, Ocean	34 min
Jul 9, 4:44 AM EDT	Areal Flood Advisory	PHI	Mercer, Middlesex	5 hr
Jul 9, 4:54 AM EDT	Areal Flood Advisory	PHI	Morris, Somerset	5 hr
Jul 9, 4:58 AM EDT	Special Marine Warning	PHI		39 min
Jul 9, 5:34 PM EDT	Areal Flood Advisory	PHI	Sussex, Warren	2 hr
Jul 9, 6:19 PM EDT	Severe Thunderstorm Warning	PHI	Salem	41 min
Jul 9, 6:50 PM EDT	Areal Flood Advisory	PHI	Gloucester, Salem	2 hr
Jul 9, 6:57 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Gloucester, Salem	63 min
Jul 9, 7:17 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester	23 min
Jul 9, 7:39 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Sussex, Warren	2 hr
Jul 9, 7:43 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Camden, Cape May, Cumberland, Gloucester, Salem	62 min
Jul 9, 7:46 PM EDT	Areal Flood Advisory	PHI	Atlantic, Camden, Cumberland, Gloucester, Salem	108 min
Jul 9, 5:17 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	43 min
Jul 9, 6:55 PM EDT	Special Weather Statement	PHI	Carbon	35 min
Jul 9, 7:07 PM EDT	Areal Flood Advisory	PHI	Carbon, Lehigh, Monroe, Northampton	3 hr
Jul 9, 7:31 PM EDT	Special Weather Statement	PHI	Northampton	29 min
Jul 8, 10:19 PM EDT	Areal Flood Advisory	PHI	Kent, Sussex	5 hr
Jul 8, 11:37 PM EDT	Tornado Warning	PHI	Sussex	23 min
Jul 8, 11:59 PM EDT	Tornado Warning	PHI	Sussex	12 min
Jul 9, 12:04 AM EDT	Tornado Warning	PHI	Sussex	26 min
Jul 9, 12:11 AM EDT	Tornado Warning	PHI	Sussex	35 min
Jul 9, 12:28 AM EDT	Tornado Warning	PHI	Sussex	17 min
Jul 9, 4:54 PM EDT	Special Weather Statement	PHI	New Castle	66 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.