Alert archive / New Jersey / Special Marine Warnings in 2021

Special Marine Warning 36, NWS Philadelphia/Mount Holly

June 8, 2021

NWS Philadelphia/Mount Holly issued this special marine warning at Jun 8, 2021, 7:39 PM EDT. It was in force for 66 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: Jun 8, 2021, 7:39 PM EDT (23:39 UTC)
Expired: Jun 8, 2021, 8:45 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), 36 km from the middle of the area, began a volume at 23:39 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, 11.7 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: 152 J/kg
Mixed-layer CIN: -137 J/kg
Mixed-layer LCL: 1181 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -51 m²/s²
0-3 km storm-relative helicity: -38 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

525 
WHUS51 KPHI 082339
SMWPHI
ANZ430-431-453-454-090045-
/O.NEW.KPHI.MA.W.0036.210608T2339Z-210609T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
739 PM EDT Tue Jun 8 2021

The National Weather Service in Mount Holly NJ has issued a

* Special Marine Warning for...
  Delaware Bay...
  Coastal waters from Great Egg Inlet NJ to Cape Henlopen DE out 20
  nm...

* Until 845 PM EDT.

* At 739 PM EDT, a strong thunderstorm was located over Brown Shoal
  Light, moving east at 15 knots.

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

  SOURCE...Radar.

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

* Locations impacted include...
  Overfalls Shoal, Brown Shoal Light, Buoy 3fb, Slaughter Beach, Cape
  May Reef, Cape Henlopen, Cape May Point, Buoy 2ms, Brandywine Shoal
  Light and Wildwood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor until hazardous weather passes.

&&

LAT...LON 3913 7474 3886 7466 3878 7505 3880 7509
      3878 7509 3877 7513 3879 7520 3888 7529
      3896 7535
TIME...MOT...LOC 2339Z 257DEG 17KT 3895 7507 

HAIL...<.75IN
WIND...49KTS

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 8, 1:27 PM EDT	Areal Flood Advisory	PHI	Warren	3 hr
Jun 8, 1:49 PM EDT	Special Weather Statement	PHI	Warren	26 min
Jun 8, 1:54 PM EDT	Areal Flood Advisory	PHI	Morris, Sussex	95 min
Jun 8, 2:19 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer	2 hr
Jun 8, 2:29 PM EDT	Special Weather Statement	PHI	Morris	16 min
Jun 8, 2:48 PM EDT	Special Weather Statement	PHI	Hunterdon, Morris, Somerset	27 min
Jun 8, 3:13 PM EDT	Special Weather Statement	PHI	Hunterdon, Somerset	32 min
Jun 8, 3:14 PM EDT	Areal Flood Advisory	PHI	Middlesex, Somerset	74 min
Jun 8, 4:12 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	48 min
Jun 8, 4:14 PM EDT	Special Marine Warning	PHI		91 min
Jun 8, 4:44 PM EDT	Special Weather Statement	PHI	Salem	31 min
Jun 8, 4:47 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	43 min
Jun 8, 4:54 PM EDT	Special Marine Warning	PHI		96 min
Jun 8, 4:56 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Camden, Gloucester	49 min
Jun 8, 4:58 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	47 min
Jun 8, 5:30 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Salem	45 min
Jun 8, 5:43 PM EDT	Special Weather Statement	PHI	Ocean	32 min
Jun 8, 6:01 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Ocean	44 min
Jun 8, 6:22 PM EDT	Special Marine Warning	PHI		83 min
Jun 8, 7:52 PM EDT	Special Weather Statement	PHI	Cape May	38 min
Jun 8, 11:54 AM EDT	Areal Flood Advisory	PHI	Monroe	2 hr
Jun 8, 12:34 PM EDT	Flash Flood Warning	PHI	Monroe	2 hr
Jun 8, 12:40 PM EDT	Special Weather Statement	PHI	Monroe	35 min
Jun 8, 1:09 PM EDT	Special Weather Statement	PHI	Monroe	21 min
Jun 8, 1:17 PM EDT	Special Weather Statement	PHI	Chester	13 min
Jun 8, 1:18 PM EDT	Areal Flood Advisory	PHI	Chester, Delaware, Montgomery, Philadelphia	3 hr
Jun 8, 1:24 PM EDT	Special Weather Statement	PHI	Delaware	21 min
Jun 8, 1:35 PM EDT	Flash Flood Warning	PHI	Chester, Delaware, Montgomery	5 hr
Jun 8, 2:07 PM EDT	Special Weather Statement	PHI	Bucks	23 min
Jun 8, 2:43 PM EDT	Special Weather Statement	PHI	Montgomery	32 min
Jun 8, 3:15 PM EDT	Special Weather Statement	PHI	Chester	30 min
Jun 8, 3:21 PM EDT	Flash Flood Warning	PHI	Chester, Montgomery	3 hr
Jun 8, 3:43 PM EDT	Special Weather Statement	PHI	Chester	32 min
Jun 8, 4:20 PM EDT	Special Weather Statement	PHI	Chester	25 min
Jun 8, 4:25 PM EDT	River Flood Warning	PHI	Chester	11 hr
Jun 8, 6:21 PM EDT	Areal Flood Warning	PHI	Chester, Delaware	15 hr
Jun 8, 7:14 PM EDT	River Flood Warning	PHI	Chester, Delaware	18 hr
Jun 8, 7:43 PM EDT	Special Weather Statement	PHI	Sussex	32 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.