Alert archive / New Jersey / Special Marine Warnings in 2021

Special Marine Warning 38, NWS Philadelphia/Mount Holly

June 9, 2021

NWS Philadelphia/Mount Holly issued this special marine warning at Jun 9, 2021, 1:46 PM EDT. It was in force for 59 min. 2 reports 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: Jun 9, 2021, 1:46 PM EDT (17:46 UTC)
Expired: Jun 9, 2021, 2:45 PM EDT
In force: 59 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 40.0 mph

The radar

The Dover AFB radar (KDOX), 75 km from the middle of the area, began a volume at 17:47 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
Jun 9, 2:00 PM EDT	MARINE TSTM WIND 60	3 Se Port Penn, DE	NJ WEATHERNET SITE NJ74.
Jun 9, 2:11 PM EDT	TSTM WND GST 60	Lower Alloways Creek, NJ	NJ WEATHERNET SITE NJ74.

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

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 5.8 hours before the alert went out and 171 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: 193 J/kg
Mixed-layer CIN: -128 J/kg
Mixed-layer LCL: 1225 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: -75 m²/s²
0-3 km storm-relative helicity: 3 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

773 
WHUS51 KPHI 091746
SMWPHI
ANZ430-091845-
/O.NEW.KPHI.MA.W.0038.210609T1746Z-210609T1845Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
146 PM EDT Wed Jun 9 2021

The National Weather Service in Mount Holly NJ has issued a

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

* Until 245 PM EDT.

* At 146 PM EDT, a strong thunderstorm was located over Stony Point.
  The strong thunderstorm was nearly stationary.

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

  SOURCE...Radar.

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

* Locations impacted include...
  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 3957 7560 3960 7549 3941 7543 3937 7552
      3946 7560
TIME...MOT...LOC 1746Z 325DEG 3KT 3948 7555 

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

$$

Gorse

1 follow-up statement

189 
FZUS71 KPHI 091810
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
210 PM EDT Wed Jun 9 2021

ANZ430-091845-
/O.CON.KPHI.MA.W.0038.000000T0000Z-210609T1845Z/
210 PM EDT Wed Jun 9 2021

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 245 PM EDT...

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

At 209 PM EDT, a strong thunderstorm was located over Stony Point.
The strong thunderstorm was nearly stationary.

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...
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 3957 7560 3960 7549 3941 7543 3937 7552
      3946 7560
TIME...MOT...LOC 1809Z 326DEG 3KT 3945 7553 

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

$$

Gorse

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 8, 8:40 PM EDT	Special Marine Warning	PHI		65 min
Jun 9, 1:48 PM EDT	Special Weather Statement	PHI	Salem	27 min
Jun 9, 1:52 PM EDT	Special Weather Statement	PHI	Atlantic	23 min
Jun 9, 2:07 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester, Salem	23 min
Jun 9, 2:14 PM EDT	Special Weather Statement	PHI	Salem	31 min
Jun 9, 2:21 PM EDT	Flash Flood Warning	PHI	Cumberland, Gloucester, Salem	73 min
Jun 9, 2:47 PM EDT	Special Marine Warning	PHI		58 min
Jun 9, 3:32 PM EDT	Special Weather Statement	PHI	Burlington	28 min
Jun 9, 3:48 PM EDT	Special Marine Warning	PHI		57 min
Jun 9, 3:49 PM EDT	Flash Flood Warning	PHI	Burlington	3 hr
Jun 9, 3:51 PM EDT	Special Weather Statement	PHI	Hunterdon	24 min
Jun 9, 5:32 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Monmouth	28 min
Jun 9, 6:46 PM EDT	Special Marine Warning	PHI		59 min
Jun 9, 6:50 PM EDT	Areal Flood Advisory	PHI	Monmouth, Ocean	87 min
Jun 9, 7:42 PM EDT	Special Marine Warning	PHI		63 min
Jun 9, 4:54 PM EDT	Flash Flood Warning	PHI	Berks, Montgomery	112 min
Jun 9, 5:27 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh, Northampton	23 min
Jun 8, 8:15 PM EDT	Special Weather Statement	PHI	Sussex	45 min
Jun 9, 7:54 AM EDT	River Flood Warning	PHI	New Castle	5 hr
Jun 9, 1:35 PM EDT	Special Weather Statement	PHI	New Castle	25 min
Jun 9, 2:26 PM EDT	Severe Thunderstorm Warning	PHI	Kent	64 min
Jun 9, 2:28 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	62 min
Jun 9, 3:11 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	64 min
Jun 9, 3:24 PM EDT	Areal Flood Advisory	PHI	Sussex	3 hr
Jun 9, 4:32 PM EDT	Areal Flood Advisory	PHI	Sussex	108 min
Jun 9, 4:37 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	27 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.