Alert archive / New Jersey / Special Marine Warnings in 2018

Special Marine Warning 21, NWS Philadelphia/Mount Holly

April 16, 2018

NWS Philadelphia/Mount Holly issued this special marine warning at Apr 16, 2018, 7:49 AM EDT. It was in force for 116 min. 1 report 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
Apr 16, 2018, 7:49 AM EDT (11:49 UTC)
Expired
Apr 16, 2018, 9:45 AM EDT
In force
116 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
0.0 in
Wind
34.0 mph

The radar

The Philadelphia radar (KDIX), 54 km from the middle of the area, began a volume at 11:50 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.

What was reported inside it

TimeReportWhereRemark
Apr 16, 8:47 AM EDTMARINE TSTM WIND 41Little Sheepshead Creek, NJ

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

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 11.8 hours before the alert went out and 181 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, Brookhaven, NY at 00:00Z on 2018-04-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLEL10008507005003002001001 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, Brookhaven, NY at 00:00Z on 2018-04-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 521 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
1 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
448 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
521 m²/s²
0-3 km storm-relative helicity
714 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

129 
WHUS51 KPHI 161149
SMWPHI
ANZ450>453-470>473-475-161345-
/O.NEW.KPHI.MA.W.0021.180416T1149Z-180416T1345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
749 AM EDT MON APR 16 2018

The National Weather Service in Mount Holly NJ has issued a

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

* Until 945 AM EDT

* At 748 AM EDT, strong thunderstorms were located along a line
  extending from Sea Isle City to near Delaware Lightship Buoy 44009
  to 10 nm southeast of Atlantic City Reef, moving north at 50 knots.

  HAZARD...Wind gusts 34 knots or greater. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Sea Girt Reef, Ship Bottom, Atlantic Highlands, Deepwater Reef,
  Garden State South Reef, Axel Carlson Reef, Harvey Cedars, Great
  Egg Reef, Lavallette, Barnegat Light, North Beach Haven, 28-
  Mile Wreck, Point Pleasant Beach, Seaside Park, Brigantine, Ocean
  Gate, Little Egg Reef, Atlantic City Reef, Barnegat Light Reef and
  Monmouth Beach.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor until hazardous weather passes.

&&

LAT...LON 4044 7398 4023 7362 3996 7338 3964 7331
      3936 7344 3902 7370 3870 7415 3822 7432
      3835 7471 3848 7472 3865 7443 3940 7438
      3957 7446 3956 7437 3970 7421 3991 7413
      3995 7421 3996 7413 4023 7401 4035 7410
TIME...MOT...LOC 1148Z 193DEG 53KT 3916 7471 3854 7467 3917 7407 

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

$$

JRK
1 follow-up statement
541 
FZUS71 KPHI 161340
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
940 AM EDT MON APR 16 2018

ANZ450>453-470>473-475-161350-
/O.EXP.KPHI.MA.W.0021.000000T0000Z-180416T1345Z/
940 AM EDT MON APR 16 2018

...THE SPECIAL MARINE WARNING WILL EXPIRE AT 945 AM EDT...

The affected areas were... 
Coastal waters from Great Egg Inlet to Cape May NJ out 20 nm...
Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20
nm...
Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20
nm...
Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 nm...
Waters from Cape May NJ to Fenwick Island DE out 20 to 40 nm...
Waters from Great Egg Inlet NJ to Cape May NJ out 20 to 40 nm...
Waters from Little Egg Inlet NJ to Great Egg Inlet NJ out 20 to 40 nm
from 20 to 40 NM...
Waters from Manasquan Inlet NJ to Little Egg Inlet NJ out 20 to 40
nm...
Waters from Sandy Hook NJ to Manasquan Inlet NJ out 20 to 40 nm...

The thunderstorms have weakened and no longer pose a significant
threat to boaters.

LAT...LON 4044 7398 4023 7362 3996 7338 3964 7331
      3936 7344 3902 7370 3870 7415 3822 7432
      3835 7471 3848 7472 3865 7443 3940 7438
      3957 7446 3956 7437 3970 7421 3991 7413
      3995 7421 3996 7413 4023 7401 4035 7410
TIME...MOT...LOC 1340Z 193DEG 53KT 3916 7471 3854 7467 3917 7407 

$$

JRK

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 16, 12:32 AM EDTWinter Weather AdvisoryPHISussex8 hr
Apr 16, 5:20 AM EDTSpecial Marine WarningPHI55 min
Apr 16, 5:34 AM EDTAreal Flood AdvisoryPHIGloucester, Salem4 hr
Apr 16, 5:52 AM EDTAreal Flood AdvisoryPHIBurlington, Camden, Gloucester, Mercer7 hr
Apr 16, 6:07 AM EDTSpecial Marine WarningPHI53 min
Apr 16, 6:30 AM EDTAreal Flood AdvisoryPHIHunterdon4 hr
Apr 16, 6:45 AM EDTSpecial Weather StatementPHICape May, Cumberland45 min
Apr 16, 6:49 AM EDTSpecial Marine WarningPHI86 min
Apr 16, 7:04 AM EDTFlash Flood WarningPHIGloucester, Salem4 hr
Apr 16, 7:26 AM EDTSpecial Weather StatementPHICamden, Gloucester, Mercer34 min
Apr 16, 8:13 AM EDTSpecial Marine WarningPHI62 min
Apr 16, 8:28 AM EDTSpecial Weather StatementPHIMiddlesex, Monmouth, Morris, Somerset, Sussex, Warren47 min
Apr 16, 9:08 AM EDTAreal Flood AdvisoryPHIHunterdon, Mercer, Middlesex, Monmouth, Morris, Ocean and 1 more4 hr
Apr 16, 9:26 AM EDTAreal Flood WarningPHIBurlington, Hunterdon, Mercer, Middlesex, Monmouth, Morris and 3 more4 hr
Apr 16, 1:18 PM EDTCoastal Flood AdvisoryPHIMiddlesex, Monmouth, Ocean13 hr
Apr 16, 1:31 PM EDTAreal Flood WarningPHIBurlington, Hunterdon, Mercer, Middlesex, Monmouth, Morris and 2 more4 hr
Apr 16, 2:45 PM EDTCoastal Flood WarningPHIBurlington, Camden, Gloucester, Mercer3 hr
Apr 16, 3:52 PM EDTSmall Craft AdvisoryPHI44 hr
Apr 16, 4:46 PM EDTRiver Flood WarningPHISomerset28 hr
Apr 16, 5:27 PM EDTAreal Flood WarningPHISomerset8 hr
Apr 16, 7:45 AM EDTRiver Flood WarningPHIDelaware4 hr
Apr 16, 8:44 AM EDTAreal Flood WarningPHIPhiladelphia2 hr
Apr 16, 10:45 AM EDTAreal Flood WarningPHIChester, Delaware, Montgomery, Philadelphia4 hr
Apr 16, 11:41 AM EDTRiver Flood WarningPHIBucks12 hr
Apr 16, 12:04 PM EDTSpecial Weather StatementPHIChester26 min
Apr 16, 2:27 PM EDTAreal Flood WarningPHIMontgomery, Philadelphia5 hr
Apr 16, 4:55 AM EDTSpecial Weather StatementPHIKent, New Castle50 min
Apr 16, 6:04 AM EDTSpecial Weather StatementPHIKent, Sussex26 min

Nearby

Special Marine Warnings in New Jersey, 2018Every special marine warning in 2018

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.