Alert archive / New Jersey / Special Marine Warnings in 2021
Special Marine Warning 14, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this special marine warning at May 4, 2021, 8:34 PM EDT. It was in force for 56 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
- May 4, 2021, 8:34 PM EDT (00:34 UTC)
- Expired
- May 4, 2021, 9:30 PM EDT
- In force
- 56 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.0 in
- Wind
- 34.0 mph
The radar
The Philadelphia radar (KDIX), 87 km from the middle of the area, began a volume at 00:33 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 00:00Z, 0.6 hours before the alert went out and 168 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.
- Mixed-layer CAPE
- 361 J/kg
- Mixed-layer CIN
- -95 J/kg
- Mixed-layer LCL
- 1356 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 106 m²/s²
- 0-3 km storm-relative helicity
- 118 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted.
656
WHUS51 KPHI 050034
SMWPHI
ANZ452>454-472-473-475-050130-
/O.NEW.KPHI.MA.W.0014.210505T0034Z-210505T0130Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
834 PM EDT Tue May 4 2021
The National Weather Service in Mount Holly NJ has issued a
* Special Marine Warning for...
Coastal waters from Little Egg Inlet NJ to Cape Henlopen DE out 20
nm...
Outer waters from Little Egg Inlet NJ to Fenwick Island DE out 20 to
40 nm...
* Until 930 PM EDT.
* At 833 PM EDT, strong thunderstorms were located along a line
extending from near Wildwood to 8 nm north of Delaware Lightship
Buoy 44009, moving northeast at 40 knots.
HAZARD...Wind gusts 34 knots or greater.
SOURCE...Radar.
IMPACT...Small craft could be damaged in briefly higher winds and
suddenly higher waves.
* Locations impacted include...
Atlantic City, Five Fathoms Buoy, Buoy 2fb, Atlantic City Reef,
Great Egg Inlet, Deepwater Reef, Great Egg Reef, Ocean City Reef,
The Lump, 28-Mile Wreck, Buoy Ge, Brigantine and Sea Isle City.
LAT...LON 3897 7375 3860 7452 3897 7464 3909 7480
3930 7461 3948 7435 3948 7434 3949 7435
3949 7434 3900 7372
TIME...MOT...LOC 0033Z 242DEG 41KT 3902 7476 3861 7475
HAIL...0.00IN
WIND...>34KTS
$$
Meola1 follow-up statement
121
FZUS71 KPHI 050120
MWSPHI
Marine Weather Statement
National Weather Service Mount Holly NJ
920 PM EDT Tue May 4 2021
ANZ452>454-472-473-475-050130-
/O.EXP.KPHI.MA.W.0014.000000T0000Z-210505T0130Z/
920 PM EDT Tue May 4 2021
...THE SPECIAL MARINE WARNING WILL EXPIRE AT 930 PM EDT...
The affected areas were...
Coastal waters from Little Egg Inlet NJ to Cape Henlopen DE out 20
nm...
Outer waters from Little Egg Inlet NJ to Fenwick Island DE out 20 to
40 nm...
The thunderstorms have weakened and no longer pose a significant
threat to boaters.
LAT...LON 3897 7375 3860 7452 3897 7464 3909 7480
3930 7461 3948 7435 3948 7434 3949 7435
3949 7434 3900 7372
TIME...MOT...LOC 0120Z 223DEG 28KT 3923 7437 3882 7437
$$
MeolaThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 4, 8:12 PM EDT | Special Marine Warning | PHI | 63 min | |
| May 5, 3:16 AM EDT | Small Craft Advisory | PHI | 30 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.