Alert archive / New Jersey / Special Marine Warnings in 2025
Special Marine Warning 21, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this special marine warning at Apr 26, 2025, 7:56 PM EDT. It was in force for 64 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
- Apr 26, 2025, 7:56 PM EDT (23:56 UTC)
- Expired
- Apr 26, 2025, 9:00 PM EDT
- In force
- 64 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 49.0 mph
The radar
The Dover AFB radar (KDOX), 55 km from the middle of the area, began a volume at 23:57 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, 11.9 hours before the alert went out and 72 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
- 266 J/kg
- Mixed-layer CIN
- -62 J/kg
- Mixed-layer LCL
- 921 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 129 m²/s²
- 0-3 km storm-relative helicity
- 110 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
267
WHUS51 KPHI 262356
SMWPHI
ANZ455-475-270100-
/O.NEW.KPHI.MA.W.0021.250426T2356Z-250427T0100Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
756 PM EDT Sat Apr 26 2025
The National Weather Service in Mount Holly NJ has issued a
* Special Marine Warning for...
Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm...
Outer waters from Cape May NJ to Fenwick Island DE out 20 to 40
nm...
* Until 900 PM EDT.
* At 756 PM EDT, a strong thunderstorm was located 11 nm west of
Bethany Beach, moving east at 35 knots.
HAZARD...Wind gusts to nearly 50 knots and small hail.
SOURCE...Radar.
IMPACT...Small craft could be damaged in briefly higher winds and
suddenly higher waves.
* Locations impacted include...
Bethany Beach, Fenwick Island, Delaware Lightship Buoy 44009, and
Indian River Inlet Bridge.
LAT...LON 3832 7464 3845 7503 3845 7510 3851 7511
3853 7515 3851 7523 3856 7533 3860 7534
3861 7534 3865 7437 3830 7441
TIME...MOT...LOC 2356Z 273DEG 36KT 3849 7530
HAIL...<.75IN
WIND...49KTS
$$
RCM3 follow-up statements
286
FZUS71 KPHI 270023
MWSPHI
Marine Weather Statement
National Weather Service Mount Holly NJ
823 PM EDT Sat Apr 26 2025
ANZ455-475-270100-
/O.CON.KPHI.MA.W.0021.000000T0000Z-250427T0100Z/
823 PM EDT Sat Apr 26 2025
...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 900 PM EDT...
For the following areas...
Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm...
Waters from Cape May NJ to Fenwick Island DE out 20 to 40 nm...
At 823 PM EDT, a strong thunderstorm was located near Fenwick Island,
moving east at 35 knots.
HAZARD...Wind gusts to nearly 50 knots and small hail.
SOURCE...Radar indicated.
IMPACT...Small craft could be damaged in briefly higher winds and
suddenly higher waves.
Locations impacted include...
Bethany Beach, Fenwick Island, Delaware Lightship Buoy 44009, and
Indian River Inlet Bridge.
LAT...LON 3832 7462 3845 7503 3845 7510 3851 7511
3853 7515 3861 7516 3865 7437 3830 7441
TIME...MOT...LOC 0023Z 273DEG 36KT 3847 7495
HAIL...<.75IN
WIND...49KTS
$$
RCM402
FZUS71 KPHI 270030
MWSPHI
Marine Weather Statement
National Weather Service Mount Holly NJ
830 PM EDT Sat Apr 26 2025
ANZ455-475-270100-
/O.CON.KPHI.MA.W.0021.000000T0000Z-250427T0100Z/
830 PM EDT Sat Apr 26 2025
...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 900 PM EDT...
For the following areas...
Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm...
Waters from Cape May NJ to Fenwick Island DE out 20 to 40 nm...
At 830 PM EDT, a strong thunderstorm was located 7 nm west of
Delaware Lightship Buoy 44009, moving east at 35 knots.
HAZARD...Wind gusts to nearly 50 knots and small hail.
SOURCE...Radar indicated.
IMPACT...Small craft could be damaged in briefly higher winds and
suddenly higher waves.
Locations impacted include...
Delaware Lightship Buoy 44009.
LAT...LON 3832 7462 3845 7503 3851 7502 3854 7503
3861 7504 3865 7437 3830 7441
TIME...MOT...LOC 0030Z 273DEG 36KT 3847 7486
HAIL...<.75IN
WIND...49KTS
$$
RCM626
FZUS71 KPHI 270053
MWSPHI
Marine Weather Statement
National Weather Service Mount Holly NJ
853 PM EDT Sat Apr 26 2025
ANZ455-475-270102-
/O.EXP.KPHI.MA.W.0021.000000T0000Z-250427T0100Z/
853 PM EDT Sat Apr 26 2025
...THE SPECIAL MARINE WARNING WILL EXPIRE AT 900 PM EDT...
The affected areas were...
Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm...
The thunderstorm is moving out of the area and will soon pose no
further significant threat to boaters.
LAT...LON 3832 7462 3845 7503 3851 7502 3854 7503
3861 7504 3865 7437 3830 7441
TIME...MOT...LOC 0052Z 273DEG 36KT 3846 7463
$$
RCMThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 26, 12:43 PM EDT | Special Marine Warning | PHI | 29 min | |
| Apr 26, 4:36 PM EDT | Special Marine Warning | PHI | 54 min | |
| Apr 26, 5:12 PM EDT | Special Marine Warning | PHI | 68 min | |
| Apr 26, 5:16 PM EDT | Severe Thunderstorm Warning | PHI | Ocean | 27 min |
| Apr 26, 5:29 PM EDT | Tornado Warning | PHI | Ocean | 14 min |
| Apr 26, 5:48 PM EDT | Special Marine Warning | PHI | 58 min | |
| Apr 26, 3:48 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 42 min |
| Apr 26, 7:55 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 34 min |
Nearby
Special Marine Warnings in New Jersey, 2025Every special marine warning in 2025
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.