Alert archive / New Jersey / Special Marine Warnings in 2021

Special Marine Warning 17, NWS Philadelphia/Mount Holly

May 8, 2021

NWS Philadelphia/Mount Holly issued this special marine warning at May 8, 2021, 3:53 PM EDT. It was in force for 56 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
May 8, 2021, 3:53 PM EDT (19:53 UTC)
Expired
May 8, 2021, 4:49 PM EDT
In force
56 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), 52 km from the middle of the area, began a volume at 19:55 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, 7.9 hours before the alert went out and 70 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 2021-05-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2021-05-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 47 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1134 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
47 m²/s²
0-3 km storm-relative helicity
47 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

045 
WHUS51 KPHI 081953
SMWPHI
ANZ455-475-082100-
/O.NEW.KPHI.MA.W.0017.210508T1953Z-210508T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
353 PM EDT Sat May 8 2021

The National Weather Service in Mount Holly NJ has issued a

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

* Until 500 PM EDT.

* At 352 PM EDT, a shower was located near Bethany Beach, moving east
  at 30 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...
  Bethany Beach, Fenwick Island and Delaware Lightship Buoy 44009. 

LAT...LON 3845 7503 3845 7510 3851 7511 3853 7514
      3850 7522 3854 7527 3863 7524 3850 7454
      3831 7460
TIME...MOT...LOC 1952Z 284DEG 32KT 3850 7519 

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

$$

SFJ
2 follow-up statements
084 
FZUS71 KPHI 082031
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
431 PM EDT Sat May 8 2021

ANZ455-475-082100-
/O.CON.KPHI.MA.W.0017.000000T0000Z-210508T2100Z/
431 PM EDT Sat May 8 2021

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 500 PM EDT...

For the following areas...
Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm...
Waters from Cape May NJ to Fenwick Island DE out 20 to 40 nm...

At 431 PM EDT, a shower was located near Delaware Lightship Buoy
44009, moving east at 30 knots.

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...
Delaware Lightship Buoy 44009.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor until hazardous weather passes.

&&

LAT...LON 3840 7487 3857 7490 3850 7454 3831 7460
TIME...MOT...LOC 2031Z 284DEG 32KT 3841 7476 

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

$$

SFJ
046 
FZUS71 KPHI 082049 RRA
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
449 PM EDT Sat May 8 2021

ANZ455-475-082059-
/O.CAN.KPHI.MA.W.0017.000000T0000Z-210508T2100Z/
449 PM EDT Sat May 8 2021

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

The affected areas were... 

Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm...
Outer waters from Cape May NJ to Fenwick Island DE out 20 to 40 nm...

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

LAT...LON 3840 7487 3857 7490 3850 7454 3831 7460
TIME...MOT...LOC 2047Z 284DEG 32KT 3837 7456 

$$

SFJ

The office that day

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

IssuedProductOfficeCountiesLasted
May 8, 11:22 AM EDTSpecial Weather StatementPHIMonmouth38 min
May 8, 1:12 PM EDTSpecial Weather StatementPHIMonmouth33 min
May 8, 1:15 PM EDTAreal Flood AdvisoryPHIMiddlesex, Monmouth58 min
May 8, 1:45 PM EDTSpecial Weather StatementPHIOcean15 min
May 8, 2:01 PM EDTSpecial Weather StatementPHIOcean14 min
May 8, 2:34 PM EDTSmall Craft AdvisoryPHI7 hr
May 8, 2:42 PM EDTSpecial Weather StatementPHIMiddlesex, Monmouth, Morris48 min
May 8, 2:47 PM EDTSpecial Marine WarningPHI31 min
May 8, 3:04 PM EDTSpecial Weather StatementPHISalem26 min
May 8, 3:23 PM EDTSpecial Weather StatementPHISalem37 min
May 8, 3:43 PM EDTSpecial Marine WarningPHI62 min
May 8, 3:46 PM EDTSpecial Weather StatementPHISomerset29 min
May 8, 4:01 PM EDTSpecial Marine WarningPHI48 min
May 8, 4:16 PM EDTSpecial Weather StatementPHICumberland29 min
May 8, 4:21 PM EDTSpecial Weather StatementPHIHunterdon, Middlesex, Somerset24 min
May 8, 4:28 PM EDTSpecial Marine WarningPHI62 min
May 8, 4:46 PM EDTSpecial Weather StatementPHIHunterdon, Mercer, Middlesex, Somerset29 min
May 8, 5:22 PM EDTSpecial Marine WarningPHI53 min
May 8, 3:39 PM EDTSpecial Weather StatementPHIKent36 min
May 8, 3:54 PM EDTSpecial Weather StatementPHISussex36 min
May 8, 4:15 PM EDTSpecial Weather StatementPHISussex30 min
May 8, 4:33 PM EDTSpecial Weather StatementPHISussex27 min
May 8, 5:56 PM EDTSpecial Weather StatementPHIKent34 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.