Special Marine Warning 104, NWS Philadelphia/Mount Holly

Issued

Jul 21, 2021, 5:52 PM EDT (21:52 UTC)

Expired

Jul 21, 2021, 6:45 PM EDT

In force

53 min

Issued by

NWS Philadelphia/Mount Holly

Area

Storm-based polygon

Hail

0.75 in

Wind

34.0 mph

The Dover AFB radar (KDOX), 102 km from the middle of the area, began a volume at 21:53 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.

436 
WHUS51 KPHI 212152
SMWPHI
ANZ453-454-473-475-212245-
/O.NEW.KPHI.MA.W.0104.210721T2152Z-210721T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
552 PM EDT Wed Jul 21 2021

The National Weather Service in Mount Holly NJ has issued a

* Special Marine Warning for...
  
Coastal waters from Great Egg Inlet NJ to Cape Henlopen DE out 20
nm...
Outer waters from Great Egg Inlet NJ to Fenwick Island DE out 20 to
40 nm...

* Until 645 PM EDT.

* At 552 PM EDT, a severe thunderstorm capable of producing
  waterspouts was located over Buoy 4fb, moving east at 40 knots.

  HAZARD...Waterspouts, wind gusts 34 knots or greater, and small 
           hail.

  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...
  Five Fathoms Buoy, Buoy 4fb, Buoy 3fb and Cape May Reef. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Frequent lightning is occurring with this storm. If caught on the
open water, stay below deck if possible and keep away from ungrounded
metal objects.

Report severe weather to the Coast Guard or the National Weather
Service.

&&

LAT...LON 3876 7477 3896 7472 3887 7387 3879 7395
      3876 7400 3872 7407 3870 7415 3866 7416
      3864 7418
TIME...MOT...LOC 2152Z 280DEG 39KT 3884 7465 

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

$$

MPS

667 
FZUS71 KPHI 212216
MWSPHI

Marine Weather Statement
National Weather Service Mount Holly NJ
616 PM EDT Wed Jul 21 2021

ANZ453-454-473-475-212245-
/O.CON.KPHI.MA.W.0104.000000T0000Z-210721T2245Z/
616 PM EDT Wed Jul 21 2021

...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 645 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...
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...

At 616 PM EDT, a severe thunderstorm capable of producing waterspouts
was located 11 nm east of Five Fathoms Buoy, moving east at 40 knots.

HAZARD...Waterspouts, wind gusts 34 knots or greater, and small 
         hail.

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.

The severe thunderstorm will remain over mainly open waters.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Frequent lightning is occurring with this storm. If caught on the
open water, stay below deck if possible and keep away from ungrounded
metal objects.

&&

LAT...LON 3880 7460 3895 7458 3887 7387 3879 7395
      3876 7400 3872 7407 3870 7415 3866 7416
      3864 7418
TIME...MOT...LOC 2216Z 280DEG 39KT 3879 7432 

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

$$

Gorse

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.