Alert archive / New Jersey / Special Marine Warnings in 2021

Special Marine Warning 145, NWS Philadelphia/Mount Holly

November 18, 2021

NWS Philadelphia/Mount Holly issued this special marine warning at Nov 18, 2021, 8:44 PM EST. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Nov 18, 2021, 8:44 PM EST (01:44 UTC)
Expired: Nov 18, 2021, 10:45 PM EST
In force: 2 hr
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.0 in
Wind: 34.0 mph

The radar

The Philadelphia radar (KDIX), 41 km from the middle of the area, began a volume at 01:46 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

Brookhaven, NY (KOKX), launched 00:00Z, 1.7 hours before the alert went out and 139 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: 1212 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 226 m²/s²
0-3 km storm-relative helicity: 240 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

460 
WHUS51 KPHI 190144
SMWPHI
ANZ450>452-470>472-190345-
/O.NEW.KPHI.MA.W.0145.211119T0144Z-211119T0345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
844 PM EST Thu Nov 18 2021

The National Weather Service in Mount Holly NJ has issued a

* Special Marine Warning for...
  Coastal and outer waters from Sandy Hook to Great Egg Inlet NJ...

* Until 1045 PM EST.

* At 843 PM EST, a front was located along a line extending from near
  Sandy Hook to 6 nm north of Atlantic City, moving east at 45 knots.

  HAZARD...Wind gusts 34 knots or greater and a sharp wind shift to 
           northwest.

  SOURCE...Radar.

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

* Locations impacted include...
  Sea Girt Reef, Atlantic City, Ship Bottom, Garden State South Reef,
  Axel Carlson Reef, Silverton, Harvey Cedars, Great Egg Reef,
  Lavallette, Barnegat Light, North Beach Haven, Point Pleasant
  Beach, Seaside Park, Brigantine, Ocean Gate, Little Egg Reef,
  Atlantic City Reef, Great Egg Inlet, Barnegat Light Reef and
  Monmouth Beach.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor immediately as gusty winds and high waves are
expected.

&&

LAT...LON 4024 7363 3995 7338 3908 7378 3930 7459
      3976 7421 3993 7416 4026 7400 4043 7397
TIME...MOT...LOC 0143Z 263DEG 46KT 4044 7392 3949 7450 

HAIL...0.00IN
WIND...>34KTS

$$

JEO

The office that day

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

Issued	Product	Office	Lasted
Nov 18, 10:37 PM EST	Special Marine Warning	PHI	53 min
Nov 19, 3:03 AM EST	Small Craft Advisory	PHI	22 hr
Nov 19, 6:01 AM EST	Small Craft Advisory	PHI	19 hr

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.