Alert archive / New Jersey / Special Marine Warnings in 2021

Special Marine Warning 39, NWS Philadelphia/Mount Holly

June 9, 2021

NWS Philadelphia/Mount Holly issued this special marine warning at Jun 9, 2021, 2:47 PM EDT. It was in force for 58 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 9, 2021, 2:47 PM EDT (18:47 UTC)
Expired
Jun 9, 2021, 3:45 PM EDT
In force
58 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), 42 km from the middle of the area, began a volume at 18:47 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.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 6.8 hours before the alert went out and 142 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-pSkew-T log-p diagram, Wallops Is Stn, VA at 12:00Z on 2021-06-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 795 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Wallops Is Stn, VA at 12:00Z on 2021-06-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
795 J/kg
Mixed-layer CIN
-87 J/kg
Mixed-layer LCL
967 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
31 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

752 
WHUS51 KPHI 091847
SMWPHI
ANZ430-431-091945-
/O.NEW.KPHI.MA.W.0039.210609T1847Z-210609T1945Z/

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

The National Weather Service in Mount Holly NJ has issued a

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

* Until 345 PM EDT.

* At 247 PM EDT, a severe thunderstorm was located near Bowers Beach,
  moving north at 10 knots.

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

  SOURCE...Radar.

  IMPACT...Small craft could be damaged in briefly higher winds and 
           suddenly higher waves. Large hail could result in 
           structural damage.

* Locations impacted include...
  Fortesque Beach, Sea Breeze, Fourteen Foot Bank Light, East Point,
  Bowers Beach, Woodland Beach, Miah Maull Light, Ship John Shoal
  Light, Cross Ledge Light and Slaughter Beach.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor until hazardous weather passes.

&&

LAT...LON 3943 7547 3919 7498 3891 7530 3909 7547
      3918 7547 3919 7549
TIME...MOT...LOC 1847Z 200DEG 11KT 3912 7543 

HAIL...>.75IN
WIND...40KTS

$$

JEO
1 follow-up statement
754 
FZUS71 KPHI 091947
MWSPHI

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

ANZ430-431-091957-
/O.EXP.KPHI.MA.W.0039.000000T0000Z-210609T1945Z/
347 PM EDT Wed Jun 9 2021

...THE SPECIAL MARINE WARNING EXPIRED AT 345 PM EDT...

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

The thunderstorm has weakened and moved out of the warned area 
and no longer poses a significant threat to boaters.

LAT...LON 3943 7547 3919 7498 3891 7530 3909 7547
      3918 7547 3919 7549
TIME...MOT...LOC 1947Z 200DEG 11KT 3929 7535 

$$

JEO

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 8, 8:40 PM EDTSpecial Marine WarningPHI65 min
Jun 9, 1:46 PM EDTSpecial Marine WarningPHI59 min
Jun 9, 1:48 PM EDTSpecial Weather StatementPHISalem27 min
Jun 9, 1:52 PM EDTSpecial Weather StatementPHIAtlantic23 min
Jun 9, 2:07 PM EDTSevere Thunderstorm WarningPHIGloucester, Salem23 min
Jun 9, 2:14 PM EDTSpecial Weather StatementPHISalem31 min
Jun 9, 2:21 PM EDTFlash Flood WarningPHICumberland, Gloucester, Salem73 min
Jun 9, 3:32 PM EDTSpecial Weather StatementPHIBurlington28 min
Jun 9, 3:48 PM EDTSpecial Marine WarningPHI57 min
Jun 9, 3:49 PM EDTFlash Flood WarningPHIBurlington3 hr
Jun 9, 3:51 PM EDTSpecial Weather StatementPHIHunterdon24 min
Jun 9, 5:32 PM EDTSevere Thunderstorm WarningPHIBurlington, Mercer, Monmouth28 min
Jun 9, 6:46 PM EDTSpecial Marine WarningPHI59 min
Jun 9, 6:50 PM EDTAreal Flood AdvisoryPHIMonmouth, Ocean87 min
Jun 9, 7:42 PM EDTSpecial Marine WarningPHI63 min
Jun 9, 4:54 PM EDTFlash Flood WarningPHIBerks, Montgomery112 min
Jun 9, 5:27 PM EDTSevere Thunderstorm WarningPHIBerks, Lehigh, Northampton23 min
Jun 8, 8:15 PM EDTSpecial Weather StatementPHISussex45 min
Jun 9, 7:54 AM EDTRiver Flood WarningPHINew Castle5 hr
Jun 9, 1:35 PM EDTSpecial Weather StatementPHINew Castle25 min
Jun 9, 2:26 PM EDTSevere Thunderstorm WarningPHIKent64 min
Jun 9, 2:28 PM EDTSevere Thunderstorm WarningPHISussex62 min
Jun 9, 3:11 PM EDTSevere Thunderstorm WarningPHISussex64 min
Jun 9, 3:24 PM EDTAreal Flood AdvisoryPHISussex3 hr
Jun 9, 4:32 PM EDTAreal Flood AdvisoryPHISussex108 min
Jun 9, 4:37 PM EDTSevere Thunderstorm WarningPHIKent, Sussex27 min

Nearby

Special Marine Warnings in New Jersey, 2021Every 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.