Alert archive / New Jersey / Special Marine Warnings in 2021

Special Marine Warning 131, NWS Philadelphia/Mount Holly

September 1, 2021

NWS Philadelphia/Mount Holly issued this special marine warning at Sep 1, 2021, 5:33 PM EDT. It was in force for 27 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
Sep 1, 2021, 5:33 PM EDT (21:33 UTC)
Expired
Sep 1, 2021, 6:00 PM EDT
In force
27 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
0.0 in
Wind
34.0 mph

The radar

The Dover AFB radar (KDOX), 72 km from the middle of the area, began a volume at 21:35 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, 9.6 hours before the alert went out and 171 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 2021-09-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 515 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 2021-09-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 57 square meters per square second.193958Sfc1 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
515 J/kg
Mixed-layer CIN
-76 J/kg
Mixed-layer LCL
955 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
57 m²/s²
0-3 km storm-relative helicity
89 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.3

Open this sounding in Storm Lab

The text

As transmitted.

201 
WHUS51 KPHI 012133
SMWPHI
ANZ430-012200-
/O.NEW.KPHI.MA.W.0131.210901T2133Z-210901T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
533 PM EDT Wed Sep 1 2021

The National Weather Service in Mount Holly NJ has issued a

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

* Until 600 PM EDT.

* At 533 PM EDT, a severe thunderstorm capable of producing
  waterspouts was located near Woodland Beach, or near Stony Point,
  moving northeast at 35 knots.

  HAZARD...Waterspouts and wind gusts 34 knots or greater.

  SOURCE...Radar.

  IMPACT...Waterspouts can easily overturn boats and create locally 
           hazardous seas. Small craft could be damaged in briefly 
           higher winds and suddenly higher waves.

* Locations impacted include...
  Woodland Beach, Stony Point, Pea Patch Island and Reedy Point. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1000 PM EDT for central and
northern Delaware...southern New Jersey...and the adjacent coastal
waters.

&&

LAT...LON 3950 7562 3973 7552 3969 7543 3961 7535
      3951 7539 3948 7533 3943 7534 3943 7529
      3924 7548 3928 7557 3930 7554 3940 7562
TIME...MOT...LOC 2133Z 213DEG 34KT 3936 7554 

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

$$

Staarmann

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 1, 3:23 AM EDTGale WarningPHI32 hr
Sep 1, 3:23 AM EDTSmall Craft AdvisoryPHI41 hr
Sep 1, 4:34 AM EDTRip Current StatementPHIAtlantic, Cape May, Monmouth, Ocean39 hr
Sep 1, 7:58 AM EDTSevere Thunderstorm WarningPHIBurlington, Ocean47 min
Sep 1, 8:39 AM EDTSevere Thunderstorm WarningPHIMonmouth, Ocean39 min
Sep 1, 9:11 AM EDTSpecial Marine WarningPHI64 min
Sep 1, 11:24 AM EDTAreal Flood AdvisoryPHISussex, Warren3 hr
Sep 1, 4:04 PM EDTAreal Flood WarningPHIWarren24 hr
Sep 1, 4:12 PM EDTFlash Flood WarningPHIHunterdon, Warren7 hr
Sep 1, 4:27 PM EDTRiver Flood WarningPHIMorris, Somerset6 days
Sep 1, 4:27 PM EDTRiver Flood WarningPHIEssex, Morris, Passaic8 days
Sep 1, 4:27 PM EDTRiver Flood WarningPHIEssex, Morris, Passaic6 days
Sep 1, 4:27 PM EDTRiver Flood WarningPHIEssex, Passaic21 days
Sep 1, 4:33 PM EDTRiver Flood WarningPHIMorris, Passaic46 hr
Sep 1, 4:40 PM EDTRiver Flood WarningPHIHunterdon, Somerset36 hr
Sep 1, 4:40 PM EDTRiver Flood WarningPHISomerset22 hr
Sep 1, 4:40 PM EDTRiver Flood WarningPHIMiddlesex, Somerset42 hr
Sep 1, 4:40 PM EDTRiver Flood WarningPHIMiddlesex, Somerset48 hr
Sep 1, 4:41 PM EDTRiver Flood WarningPHISomerset61 hr
Sep 1, 5:13 PM EDTSevere Thunderstorm WarningPHIHunterdon, Mercer47 min
Sep 1, 5:26 PM EDTFlash Flood WarningPHIBurlington, Camden, Gloucester, Salem9 hr
Sep 1, 5:34 PM EDTTornado WarningPHIMercer26 min
Sep 1, 5:35 PM EDTTornado WarningPHICumberland, Salem25 min
Sep 1, 5:42 PM EDTFlash Flood WarningPHIHunterdon, Mercer, Morris, Somerset, Warren10 hr
Sep 1, 5:57 PM EDTTornado WarningPHIGloucester, Salem33 min
Sep 1, 5:57 PM EDTTornado WarningPHIHunterdon, Mercer, Somerset33 min
Sep 1, 6:05 PM EDTFlash Flood WarningPHIHunterdon, Mercer, Middlesex, Morris, Somerset10 hr
Sep 1, 6:08 PM EDTFlash Flood WarningPHIHunterdon, Morris, Somerset, Sussex, Warren6 hr
Sep 1, 6:14 PM EDTSpecial Marine WarningPHI61 min
Sep 1, 6:20 PM EDTTornado WarningPHIHunterdon, Mercer, Somerset40 min
Sep 1, 6:22 PM EDTTornado Warning Tornado observedPHIBurlington, Camden, Gloucester23 min
Sep 1, 6:42 PM EDTTornado WarningPHIBurlington, Camden33 min
Sep 1, 6:59 PM EDTSevere Thunderstorm WarningPHIHunterdon, Mercer, Middlesex, Monmouth, Morris, Somerset61 min
Sep 1, 7:04 PM EDTTornado Warning EmergencyTornado observedCatastrophic damage threatPHIBurlington, Mercer26 min
Sep 1, 7:22 PM EDTTornado WarningPHIHunterdon, Mercer11 min
Sep 1, 7:28 PM EDTTornado WarningPHIMercer, Middlesex, Morris, Somerset47 min
Sep 1, 7:31 PM EDTFlash Flood Warning EmergencyCatastrophic damage threatPHIHunterdon, Mercer, Somerset4 hr
Sep 1, 7:44 PM EDTSpecial Marine WarningPHI61 min
Sep 1, 6:19 AM EDTAreal Flood AdvisoryPHIChester, Delaware116 min
Sep 1, 6:49 AM EDTFlash Flood WarningPHIChester, Delaware, Philadelphia86 min
Sep 1, 12:07 PM EDTFlash Flood WarningPHICarbon, Monroe4 hr
Sep 1, 1:29 PM EDTFlash Flood WarningPHIBerks, Lehigh6 hr
Sep 1, 2:53 PM EDTFlash Flood WarningPHIBerks, Chester, Delaware, Montgomery9 hr
Sep 1, 3:55 PM EDTRiver Flood WarningPHIMontgomery36 hr
Sep 1, 3:55 PM EDTRiver Flood WarningPHIChester, Montgomery, Philadelphia43 hr
Sep 1, 3:55 PM EDTRiver Flood WarningPHIMontgomery, Philadelphia41 hr
Sep 1, 3:55 PM EDTRiver Flood WarningPHIPhiladelphia39 hr
Sep 1, 3:55 PM EDTRiver Flood WarningPHIBerks24 hr
Sep 1, 4:02 PM EDTRiver Flood WarningPHIMonroe24 hr
Sep 1, 4:10 PM EDTRiver Flood WarningPHIMonroe19 hr
Sep 1, 4:12 PM EDTRiver Flood WarningPHILehigh, Northampton25 hr
Sep 1, 4:12 PM EDTRiver Flood WarningPHILehigh, Northampton24 hr
Sep 1, 4:12 PM EDTRiver Flood WarningPHICarbon15 hr
Sep 1, 4:13 PM EDTTornado WarningPHIChester32 min
Sep 1, 4:20 PM EDTRiver Flood WarningPHIMontgomery22 hr
Sep 1, 4:21 PM EDTRiver Flood WarningPHIBucks29 hr
Sep 1, 4:42 PM EDTFlash Flood Warning EmergencyConsiderable damage threatPHIChester, Delaware, Montgomery6 hr
Sep 1, 5:07 PM EDTRiver Flood WarningPHIChester17 hr
Sep 1, 5:15 PM EDTTornado WarningPHIDelaware, Montgomery, Philadelphia30 min
Sep 1, 6:38 PM EDTRiver Flood WarningPHIChester, Delaware26 hr
Sep 1, 7:05 PM EDTFlash Flood Warning EmergencyCatastrophic damage threatPHIBucks8 hr
Sep 1, 7:23 PM EDTAreal Flood WarningPHIBerks, Lehigh14 hr
Sep 1, 7:53 PM EDTRiver Flood WarningPHIDelaware13 hr
Sep 1, 8:03 AM EDTRiver Flood WarningPHINew Castle4 hr
Sep 1, 4:59 PM EDTTornado WarningPHIKent, Sussex46 min
Sep 1, 5:01 PM EDTTornado WarningPHIKent, New Castle44 min
Sep 1, 5:16 PM EDTSevere Thunderstorm WarningPHIKent, Sussex44 min
Sep 1, 6:03 PM EDTSevere Thunderstorm WarningPHIKent, Sussex42 min
Sep 1, 6:08 PM EDTRiver Flood WarningPHINew Castle18 hr
Sep 1, 6:15 PM EDTRiver Flood WarningPHINew Castle9 hr
Sep 1, 6:24 PM EDTTornado WarningPHINew Castle16 min
Sep 1, 6:38 PM EDTRiver Flood WarningPHINew Castle28 hr
Sep 1, 6:57 PM EDTSevere Thunderstorm WarningPHIKent, Sussex63 min
Sep 1, 7:44 PM EDTRiver Flood WarningPHINew Castle11 hr

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.