Alert archive / New Jersey / Special Marine Warnings in 2021

Special Marine Warning 40, NWS Philadelphia/Mount Holly

June 9, 2021

NWS Philadelphia/Mount Holly issued this special marine warning at Jun 9, 2021, 3:48 PM EDT. It was in force for 57 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, 3:48 PM EDT (19:48 UTC)
Expired
Jun 9, 2021, 4:45 PM EDT
In force
57 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), 50 km from the middle of the area, began a volume at 19:50 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, 7.8 hours before the alert went out and 73 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.

531 
WHUS51 KPHI 091948
SMWPHI
ANZ454-455-092045-
/O.NEW.KPHI.MA.W.0040.210609T1948Z-210609T2045Z/

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

* Until 445 PM EDT.

* At 348 PM EDT, a strong thunderstorm was located over Bethany
  Beach, moving southeast at 5 knots.

  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...
  Rehoboth Beach, Bethany Beach, Fenwick Island and Indian River
  Inlet Bridge.

LAT...LON 3842 7495 3846 7504 3845 7507 3845 7510
      3851 7511 3852 7511 3875 7513 3873 7482
      3842 7490
TIME...MOT...LOC 1948Z 304DEG 7KT 3854 7509 

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

$$

JEO
1 follow-up statement
615 
FZUS71 KPHI 092040
MWSPHI

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

ANZ454-455-092049-
/O.EXP.KPHI.MA.W.0040.000000T0000Z-210609T2045Z/
440 PM EDT Wed Jun 9 2021

...THE SPECIAL MARINE WARNING WILL EXPIRE AT 445 PM EDT...

The affected areas were... 

Coastal waters from Cape May NJ to Fenwick Island DE out 20 nm...

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

LAT...LON 3842 7495 3846 7504 3845 7507 3845 7510
      3851 7511 3852 7511 3875 7513 3873 7482
      3842 7490
TIME...MOT...LOC 2039Z 304DEG 7KT 3849 7499 

$$

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, 2:47 PM EDTSpecial Marine WarningPHI58 min
Jun 9, 3:32 PM EDTSpecial Weather StatementPHIBurlington28 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.