Alert archive / New York / Special Marine Warnings in 2021

Special Marine Warning 21, NWS New York, NY

June 30, 2021

NWS New York, NY issued this special marine warning at Jun 30, 2021, 9:38 PM EDT. It was in force for 67 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 30, 2021, 9:38 PM EDT (01:38 UTC)
Expired
Jun 30, 2021, 10:45 PM EDT
In force
67 min
Issued by
NWS New York, NY
Area
Storm-based polygon
Hail
0.75 in
Wind
34.0 mph

The radar

The Philadelphia radar (KDIX), 87 km from the middle of the area, began a volume at 01:40 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

Brookhaven, NY (KOKX), launched 00:00Z, 1.6 hours before the alert went out and 91 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 2021-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1308 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, Brookhaven, NY at 00:00Z on 2021-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 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
1308 J/kg
Mixed-layer CIN
-130 J/kg
Mixed-layer LCL
1402 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
99 m²/s²
Significant tornado parameter
0.1
Supercell composite
2.1

Open this sounding in Storm Lab

The text

As transmitted.

527 
WHUS51 KOKX 010138
SMWOKX
ANZ338-345-355-010245-
/O.NEW.KOKX.MA.W.0021.210701T0138Z-210701T0245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service New York NY
938 PM EDT Wed Jun 30 2021

The National Weather Service in Upton NY has issued a

* Special Marine Warning for...
  
  Sandy Hook NJ to Fire Island Inlet NY out 20 NM...

  New York Harbor...
  Long Island South Shore Bays...

* Until 1045 PM EDT.

* At 938 PM EDT, a strong thunderstorm was located near Upper New
  York Harbor, moving east at 25 knots.

  HAZARD...Wind gusts 34 knots or greater and small hail.

  SOURCE...Radar indicated.

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

* The strong thunderstorm will be near...
  The Verrazano Narrows Bridge around 945 PM EDT.
  Upper New York Harbor and Lower New York Harbor around 950 PM EDT.
  Rockaway Inlet around 1000 PM EDT.
  Jamaica Bay around 1010 PM EDT.
  Barnum Island and Island Park around 1030 PM EDT.
  Middle Bay around 1035 PM EDT.
  East Bay and Jones Inlet around 1040 PM EDT.
  South Oyster Bay and Jones Beach around 1045 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor until hazardous weather passes.

&&

LAT...LON 4056 7413 4059 7409 4067 7413 4073 7403
      4071 7398 4062 7402 4059 7397 4064 7393
      4067 7382 4062 7372 4065 7370 4064 7364
      4067 7355 4067 7341 4054 7338 4050 7420
      4053 7421
TIME...MOT...LOC 0138Z 266DEG 26KT 4066 7413 

HAIL...<.75IN
WIND...>34KTS

$$

MW
1 follow-up statement
342 
FZUS71 KOKX 010217
MWSOKX

Marine Weather Statement
National Weather Service New York NY
1017 PM EDT Wed Jun 30 2021

ANZ338-010227-
/O.CAN.KOKX.MA.W.0021.000000T0000Z-210701T0245Z/
1017 PM EDT Wed Jun 30 2021

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

The affected areas were...
New York Harbor...

  New York Harbor...

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

LAT...LON 4054 7394 4057 7394 4057 7396 4059 7397
      4064 7393 4067 7382 4062 7372 4065 7370
      4064 7364 4067 7355 4067 7341 4054 7338
      4051 7397 4052 7397
TIME...MOT...LOC 0217Z 266DEG 26KT 4068 7376 

$$

ANZ345-355-010245-
/O.CON.KOKX.MA.W.0021.000000T0000Z-210701T0245Z/
1017 PM EDT Wed Jun 30 2021

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 1045 PM EDT...

For the following areas...
Sandy Hook NJ to Fire Island Inlet NY out 20 nm...
South Shore Bays from Jones Inlet through Shinnecock Bay...

At 1017 PM EDT, a strong thunderstorm was located near Jamaica Bay,
moving east at 25 knots.

HAZARD...Wind gusts 34 knots or greater and small hail.

SOURCE...Radar indicated.

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

The strong thunderstorm will be near...
  Island Park around 1025 PM EDT.
  Barnum Island around 1030 PM EDT.
  Middle Bay and Jones Inlet around 1035 PM EDT.
  East Bay and Jones Beach around 1040 PM EDT.
  South Oyster Bay around 1050 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Move to safe harbor until hazardous weather passes.

&&

LAT...LON 4054 7394 4057 7394 4057 7396 4059 7397
      4064 7393 4067 7382 4062 7372 4065 7370
      4064 7364 4067 7355 4067 7341 4054 7338
      4051 7397 4052 7397
TIME...MOT...LOC 0217Z 266DEG 26KT 4068 7376 

HAIL...<.75IN
WIND...>34KTS

$$

JM

The office that day

Everything else NWS New York, NY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 30, 8:29 PM EDTSpecial Marine WarningOKX61 min
Jun 30, 8:31 PM EDTSpecial Weather StatementOKXNassau44 min
Jun 30, 8:37 PM EDTSevere Thunderstorm WarningOKXSuffolk38 min
Jun 30, 8:41 PM EDTSpecial Weather StatementOKXBronx, New York49 min
Jun 30, 8:55 PM EDTSpecial Marine WarningOKX35 min
Jun 30, 9:06 PM EDTSpecial Weather StatementOKXNassau39 min
Jun 30, 9:07 PM EDTSpecial Weather StatementOKXRichmond38 min
Jun 30, 9:24 PM EDTSevere Thunderstorm WarningOKXNassau, Suffolk29 min
Jun 30, 9:30 PM EDTSpecial Marine WarningOKX60 min
Jun 30, 9:39 PM EDTSevere Thunderstorm WarningOKXKings, Nassau, New York, Queens, Richmond51 min
Jun 30, 9:57 PM EDTSpecial Weather StatementOKXBronx, New York33 min
Jun 30, 10:00 PM EDTSpecial Marine WarningOKX45 min
Jun 30, 10:22 PM EDTSpecial Weather StatementOKXNassau23 min
Jun 30, 10:45 PM EDTSpecial Weather StatementOKXNassau45 min
Jun 30, 11:27 PM EDTSpecial Weather StatementOKXSuffolk93 min
Jul 1, 10:47 AM EDTFlash Flood WatchOKXBronx, Kings, Nassau, New York, Queens, Richmond and 1 more10 hr
Jul 1, 7:42 PM EDTSpecial Marine WarningOKX50 min
Jun 30, 9:00 PM EDTSpecial Weather StatementOKX30 min

Nearby

Special Marine Warnings in New York, 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.