Alert archive / New Jersey / Special Marine Warnings in 2021

Special Marine Warning 124, NWS Philadelphia/Mount Holly

August 27, 2021

NWS Philadelphia/Mount Holly issued this special marine warning at Aug 27, 2021, 4:46 PM EDT. It was in force for 43 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: Aug 27, 2021, 4:46 PM EDT (20:46 UTC)
Expired: Aug 27, 2021, 5:29 PM EDT
In force: 43 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), 85 km from the middle of the area, began a volume at 20:48 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.8 hours before the alert went out and 173 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: 780 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 983 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 41 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

213 
WHUS51 KPHI 272046
SMWPHI
ANZ430-272145-
/O.NEW.KPHI.MA.W.0124.210827T2046Z-210827T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
446 PM EDT Fri Aug 27 2021

The National Weather Service in Mount Holly NJ has issued a

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

* Until 545 PM EDT.

* At 446 PM EDT, a strong thunderstorm was located over Reedy Point.
  The strong thunderstorm was nearly stationary.

  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...
  Pea Patch Island, Stony Point and Reedy Point. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor until hazardous weather passes.

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

&&

LAT...LON 3967 7562 3969 7549 3945 7546 3942 7562
TIME...MOT...LOC 2046Z 277DEG 4KT 3955 7556 

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

$$

Gorse

1 follow-up statement

756 
FZUS71 KPHI 272129
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
529 PM EDT Fri Aug 27 2021

ANZ430-272138-
/O.CAN.KPHI.MA.W.0124.000000T0000Z-210827T2145Z/
529 PM EDT Fri Aug 27 2021

...THE SPECIAL MARINE WARNING IS CANCELLED...

The affected areas were... 
Upper Delaware Bay...

The thunderstorm has weakened and no longer poses a significant
threat to boaters.

LAT...LON 3967 7562 3969 7549 3945 7546 3942 7562
TIME...MOT...LOC 2128Z 277DEG 4KT 3954 7550 

$$

Gorse

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 27, 1:33 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden	83 min
Aug 27, 2:18 PM EDT	Small Craft Advisory	PHI		44 hr
Aug 27, 2:28 PM EDT	Special Weather Statement	PHI	Atlantic	47 min
Aug 27, 2:33 PM EDT	Areal Flood Advisory	PHI	Warren	109 min
Aug 27, 2:37 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	38 min
Aug 27, 2:38 PM EDT	Severe Thunderstorm Warning	PHI	Warren	35 min
Aug 27, 2:59 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	46 min
Aug 27, 3:07 PM EDT	Severe Thunderstorm Warning	PHI	Warren	24 min
Aug 27, 3:16 PM EDT	Special Weather Statement	PHI	Burlington	44 min
Aug 27, 3:30 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Ocean	45 min
Aug 27, 3:38 PM EDT	Special Weather Statement	PHI	Camden	52 min
Aug 27, 3:45 PM EDT	Special Weather Statement	PHI	Ocean	30 min
Aug 27, 3:54 PM EDT	Special Weather Statement	PHI	Atlantic	51 min
Aug 27, 3:59 PM EDT	Special Weather Statement	PHI	Ocean	46 min
Aug 27, 4:06 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester	39 min
Aug 27, 4:37 PM EDT	Areal Flood Advisory	PHI	Gloucester	106 min
Aug 27, 4:56 PM EDT	Special Weather Statement	PHI	Atlantic	34 min
Aug 27, 5:02 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Cumberland	29 min
Aug 27, 5:09 PM EDT	Areal Flood Advisory	PHI	Atlantic, Cape May, Cumberland	2 hr
Aug 27, 5:21 PM EDT	Special Weather Statement	PHI	Middlesex	39 min
Aug 27, 5:29 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Middlesex, Monmouth, Somerset	3 hr
Aug 27, 5:44 PM EDT	Flash Flood Warning	PHI	Middlesex	4 hr
Aug 27, 6:52 PM EDT	Areal Flood Advisory	PHI	Salem	98 min
Aug 27, 1:20 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	2 hr
Aug 27, 1:36 PM EDT	Special Weather Statement	PHI	Monroe	24 min
Aug 27, 1:52 PM EDT	Severe Thunderstorm Warning	PHI	Chester	53 min
Aug 27, 2:12 PM EDT	Special Weather Statement	PHI	Northampton	33 min
Aug 27, 2:18 PM EDT	Areal Flood Advisory	PHI	Chester	93 min
Aug 27, 2:32 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe, Northampton	28 min
Aug 27, 2:42 PM EDT	Severe Thunderstorm Warning	PHI	Chester	14 min
Aug 27, 3:44 PM EDT	Special Weather Statement	PHI	Delaware	31 min
Aug 27, 6:29 PM EDT	Areal Flood Advisory	PHI	Berks	3 hr
Aug 27, 6:41 PM EDT	Special Weather Statement	PHI	Berks	34 min
Aug 27, 7:17 PM EDT	Flash Flood Warning	PHI	Berks	3 hr
Aug 27, 3:48 PM EDT	Areal Flood Advisory	PHI	New Castle	102 min
Aug 27, 5:11 PM EDT	Areal Flood Advisory	PHI	New Castle	3 hr
Aug 27, 5:39 PM EDT	Special Weather Statement	PHI	New Castle	36 min
Aug 27, 6:10 PM EDT	Areal Flood Advisory	PHI	New Castle	2 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.