Alert archive / New Jersey / Special Marine Warnings in 2021

Special Marine Warning 140, NWS Philadelphia/Mount Holly

October 16, 2021

NWS Philadelphia/Mount Holly issued this special marine warning at Oct 16, 2021, 6:09 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: Oct 16, 2021, 6:09 PM EDT (22:09 UTC)
Expired: Oct 16, 2021, 7:15 PM EDT
In force: 66 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.0 in
Wind: 34.0 mph

The radar

The Dover AFB radar (KDOX), 79 km from the middle of the area, began a volume at 22:11 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, 10.2 hours before the alert went out and 88 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: 914 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 50 m²/s²
0-3 km storm-relative helicity: 191 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

712 
WHUS51 KPHI 162209
SMWPHI
ANZ454-455-475-162315-
/O.NEW.KPHI.MA.W.0140.211016T2209Z-211016T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
609 PM EDT Sat Oct 16 2021

The National Weather Service in Mount Holly NJ has issued a

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

* Until 715 PM EDT.

* At 607 PM EDT, showers were located along a line extending from 7 
  nm southwest of Buoy 2ms to near Fenwick Island, moving east at 35 
  knots.

  HAZARD...Wind gusts 34 knots or greater.

  SOURCE...Radar.

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

* Locations impacted include...
  Rehoboth Beach, Bethany Beach, Fenwick Island, Delaware Lightship
  Buoy 44009 and Indian River Inlet Bridge.

LAT...LON 3822 7433 3845 7503 3845 7510 3851 7511
      3853 7514 3850 7521 3877 7518 3869 7415
      3861 7417 3851 7426 3834 7427 3822 7431
TIME...MOT...LOC 2207Z 270DEG 28KT 3873 7492 3841 7496 

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

$$

Fitzsimmons

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 16, 10:35 AM EDT	Coastal Flood Statement	PHI	Ocean	2 hr
Oct 16, 3:22 PM EDT	Special Marine Warning	PHI		113 min
Oct 16, 3:31 PM EDT	Severe Thunderstorm Warning	PHI	Salem	18 min
Oct 16, 3:41 PM EDT	Special Weather Statement	PHI	Hunterdon, Sussex, Warren	49 min
Oct 16, 4:02 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Morris, Somerset	43 min
Oct 16, 4:18 PM EDT	Special Weather Statement	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Mercer and 1 more	57 min
Oct 16, 5:10 PM EDT	Special Marine Warning	PHI		95 min
Oct 16, 5:29 PM EDT	Special Marine Warning	PHI		91 min
Oct 16, 6:52 PM EDT	Coastal Flood Statement	PHI	Ocean	4 hr
Oct 16, 1:39 PM EDT	Special Weather Statement	PHI	Berks	51 min
Oct 16, 2:32 PM EDT	Special Weather Statement	PHI	Berks, Lehigh	58 min
Oct 16, 2:44 PM EDT	Special Weather Statement	PHI	Chester	61 min
Oct 16, 3:40 PM EDT	Special Weather Statement	PHI	New Castle	50 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.