Alert archive / New Jersey / Special Marine Warnings in 2017

Special Marine Warning 21, NWS Philadelphia/Mount Holly

April 6, 2017

NWS Philadelphia/Mount Holly issued this special marine warning at Apr 6, 2017, 3:02 PM EDT. It was in force for 58 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 6, 2017, 3:02 PM EDT (19:02 UTC)
Expired
Apr 6, 2017, 4:00 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 Philadelphia radar (KDIX), 80 km from the middle of the area, began a volume at 19:01 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 6, 3:14 PM EDTMARINE TSTM WIND 49Ocean City, NJ

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

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 7.0 hours before the alert went out and 169 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 2017-04-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 61 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°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 2017-04-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -23 square meters per square second.1939587897117Sfc1 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
61 J/kg
Mixed-layer CIN
-145 J/kg
Mixed-layer LCL
1205 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
-23 m²/s²
0-3 km storm-relative helicity
70 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

417 
WHUS51 KPHI 061902
SMWPHI
ANZ450>455-470>473-475-062000-
/O.NEW.KPHI.MA.W.0021.170406T1902Z-170406T2000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
302 PM EDT THU APR 6 2017

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* SPECIAL MARINE WARNING FOR...
 
  COASTAL AND OUTER WATERS FROM SANDY HOOK NJ TO FENWICK ISLAND DE...

* UNTIL 400 PM EDT

* AT 300 PM EDT...STRONG THUNDERSTORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM NEAR BUOY 2FB TO 8 NM WEST OF ASSAWOMAN BAY...MOVING
  NORTHEAST 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...
  ATLANTIC CITY...FIVE FATHOMS BUOY...BUOY 2FB...FENWICK ISLAND...
  BUOY 4FB...SHIP BOTTOM...BUOY 3FB...DEEPWATER REEF...
  GARDEN STATE SOUTH REEF...AXEL CARLSON REEF...SILVERTON...
  HARVEY CEDARS...GREAT EGG REEF...OCEAN CITY REEF...
  INDIAN RIVER INLET BRIDGE...LAVALLETTE...OVERFALLS SHOAL...
  THE LUMP...BARNEGAT LIGHT AND NORTH BEACH HAVEN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO SAFE HARBOR UNTIL HAZARDOUS WEATHER PASSES.

&&

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 500 PM EDT FOR
SOUTHERN DELAWARE...AND SOUTHERN NEW JERSEY.

LAT...LON 3845 7506 3857 7513 3853 7520 3858 7528
      3927 7465 3922 7473 3934 7467 3947 7443
      3958 7451 3956 7437 3970 7422 3991 7413
      3995 7421 4014 7411 3993 7336 3971 7330
      3947 7338 3897 7374 3870 7415 3822 7431
TIME...MOT...LOC 1900Z 227DEG 29KT 3897 7458 3842 7525 

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

$$

33

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 6, 12:29 PM EDTSpecial Marine WarningPHI61 min
Apr 6, 1:00 PM EDTSpecial Weather StatementPHISalem60 min
Apr 6, 1:21 PM EDTSpecial Marine WarningPHI54 min
Apr 6, 1:33 PM EDTSpecial Marine WarningPHI57 min
Apr 6, 1:53 PM EDTSpecial Marine WarningPHI22 min
Apr 6, 2:07 PM EDTSpecial Weather StatementPHIAtlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 6 more53 min
Apr 6, 2:15 PM EDTSpecial Marine WarningPHI45 min
Apr 6, 2:24 PM EDTSpecial Marine WarningPHI36 min
Apr 6, 2:29 PM EDTAreal Flood AdvisoryPHIBurlington, Camden, Cumberland, Gloucester, Salem4 hr
Apr 6, 2:56 PM EDTSpecial Weather StatementPHICamden, Cumberland, Gloucester, Salem64 min
Apr 6, 3:09 PM EDTSpecial Marine WarningPHI51 min
Apr 6, 3:36 PM EDTSpecial Weather StatementPHIAtlantic, Monmouth, Ocean24 min
Apr 6, 3:56 PM EDTSpecial Weather StatementPHIMiddlesex, Monmouth, Ocean49 min
Apr 6, 3:57 PM EDTAreal Flood AdvisoryPHIMiddlesex, Monmouth, Morris, Ocean4 hr
Apr 6, 3:59 PM EDTSpecial Marine WarningPHI61 min
Apr 6, 4:26 PM EDTAreal Flood AdvisoryPHIHunterdon, Sussex, Warren4 hr
Apr 6, 7:41 PM EDTAreal Flood WarningPHIHunterdon, Somerset3 hr
Apr 6, 11:58 AM EDTAreal Flood AdvisoryPHIBerks, Carbon, Chester, Lehigh, Monroe, Montgomery and 1 more4 hr
Apr 6, 4:02 PM EDTAreal Flood AdvisoryPHIBerks, Carbon, Chester, Lehigh, Monroe, Montgomery and 1 more6 hr
Apr 6, 11:59 AM EDTSpecial Weather StatementPHICaroline31 min
Apr 6, 12:17 PM EDTSevere Thunderstorm WarningPHICaroline, Kent, Queen Anne's, Talbot24 min
Apr 6, 1:08 PM EDTSevere Thunderstorm WarningPHICaroline, Talbot40 min
Apr 6, 2:13 PM EDTSpecial Weather StatementPHIKent, Queen Anne's, Talbot47 min
Apr 6, 4:41 PM EDTSpecial Weather StatementPHITalbot34 min

Nearby

Special Marine Warnings in New Jersey, 2017Every special marine warning in 2017

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.