Special Marine Warning 133, NWS Philadelphia/Mount Holly

Issued

Sep 1, 2021, 7:44 PM EDT (23:44 UTC)

Expired

Sep 1, 2021, 8:45 PM EDT

In force

61 min

Issued by

NWS Philadelphia/Mount Holly

Area

Storm-based polygon

Hail

0.0 in

Wind

49.0 mph

The Dover AFB radar (KDOX), 49 km from the middle of the area, began a volume at 23:46 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.

821 
WHUS51 KPHI 012344
SMWPHI
ANZ430-431-453-454-020045-
/O.NEW.KPHI.MA.W.0133.210901T2344Z-210902T0045Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Special Marine Warning for...
  Delaware Bay...
  Coastal waters from Great Egg Inlet NJ to Cape Henlopen DE out 20
  nm...

* Until 845 PM EDT.

* At 744 PM EDT, severe thunderstorms capable of producing
  waterspouts were located along a line extending from near Bowers
  Beach to Slaughter Beach to 9 nm west of Rehoboth Beach, moving
  northeast at 40 knots.

  HAZARD...Waterspouts and wind gusts to nearly 50 knots.

  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...
  Brown Shoal Light, Fourteen Foot Bank Light, Slaughter Beach, Cape
  Henlopen, East Point, Bowers Beach, Cape May Point, Miah Maull
  Light, Ship John Shoal Light, Brandywine Shoal Light, Wildwood,
  Fortesque Beach, Sea Breeze, Sea Isle City, Cross Ledge Light and
  The Lump.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Move to safe harbor immediately as gusty winds and high waves are
expected.

&&

LAT...LON 3947 7524 3926 7508 3941 7509 3943 7501
      3932 7491 3923 7495 3915 7481 3924 7477
      3931 7485 3939 7478 3939 7476 3910 7463
      3880 7509 3857 7533 3875 7520 3876 7530
      3883 7529 3894 7541 3920 7553
TIME...MOT...LOC 2344Z 222DEG 38KT 3911 7538 3891 7531 3868 7529 

WATERSPOUT...POSSIBLE
HAIL...0.00IN
WIND...49KTS

$$

Staarmann

768 
FZUS71 KPHI 020031
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
831 PM EDT Wed Sep 1 2021

ANZ430-020040-
/O.CAN.KPHI.MA.W.0133.000000T0000Z-210902T0045Z/
831 PM EDT Wed Sep 1 2021

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

The affected areas were...
Upper Delaware Bay...

The thunderstorms have moved out of the warned area and no longer 
pose a significant threat to boaters.

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

LAT...LON 3911 7498 3928 7507 3930 7506 3941 7509
      3943 7501 3932 7491 3923 7495 3915 7481
      3916 7481 3920 7477 3925 7478 3931 7485
      3935 7478 3939 7478 3939 7476 3910 7463
      3877 7512
TIME...MOT...LOC 0030Z 230DEG 31KT 3935 7499 3915 7492 3890 7497 

$$

ANZ431-453-454-020045-
/O.CON.KPHI.MA.W.0133.000000T0000Z-210902T0045Z/
831 PM EDT Wed Sep 1 2021

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 845 PM EDT...

For the following areas...
Coastal waters from Cape May NJ to Cape Henlopen DE out 20 nm...
Coastal waters from Great Egg Inlet to Cape May NJ out 20 nm...
Delaware Bay waters south of East Point NJ to Slaughter Beach DE...

At 830 PM EDT, severe thunderstorms capable of producing waterspouts
were located along a line extending from 10 nm northeast of Fortesque
Beach to near East Point to near Cape May Point, moving northeast at
30 knots.

HAZARD...Waterspouts and wind gusts to 40 knots.

SOURCE...Radar indicated.

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...
Overfalls Shoal, Sea Isle City, Cape May Point, Wildwood, Cape
Henlopen and The Lump.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Move to safe harbor immediately as gusty winds and high waves are
expected.

&&

LAT...LON 3911 7498 3928 7507 3930 7506 3941 7509
      3943 7501 3932 7491 3923 7495 3915 7481
      3916 7481 3920 7477 3925 7478 3931 7485
      3935 7478 3939 7478 3939 7476 3910 7463
      3877 7512
TIME...MOT...LOC 0030Z 230DEG 31KT 3935 7499 3915 7492 3890 7497 

WATERSPOUT...POSSIBLE
HAIL...0.00IN
WIND...40KTS

$$

Staarmann

Special Marine Warnings in New Jersey, 2021Every special marine warning in 2021

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.