Alert archive / New Jersey / Special Marine Warnings in 2021
Special Marine Warning 65, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this special marine warning at Jul 4, 2021, 5:39 PM EDT. It was in force for 66 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
- Jul 4, 2021, 5:39 PM EDT (21:39 UTC)
- Expired
- Jul 4, 2021, 6:45 PM EDT
- In force
- 66 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 34.0 mph
The radar
The Philadelphia radar (KDIX), 44 km from the middle of the area, began a volume at 21:40 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 12:00Z, 9.7 hours before the alert went out and 189 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 519 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 104 m²/s²
- 0-3 km storm-relative helicity
- 114 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
339
WHUS51 KPHI 042139
SMWPHI
ANZ451-042245-
/O.NEW.KPHI.MA.W.0065.210704T2139Z-210704T2245Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
539 PM EDT Sun Jul 4 2021
The National Weather Service in Mount Holly NJ has issued a
* Special Marine Warning for...
Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20
nm...
* Until 645 PM EDT.
* At 539 PM EDT, a strong thunderstorm was located near Beach Haven,
moving southeast at 10 knots.
HAZARD...Wind gusts 34 knots or greater and small hail.
SOURCE...Radar.
IMPACT...Small craft could be damaged in briefly higher winds and
suddenly higher waves.
* Locations impacted include...
Beach Haven, North Beach Haven, Garden State South Reef, Little Egg
Reef and Ship Bottom.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to safe harbor until hazardous weather passes.
Report severe weather to the Coast Guard or the National Weather
Service.
&&
LAT...LON 3945 7420 3955 7443 3957 7442 3958 7440
3960 7440 3967 7430 3964 7406
TIME...MOT...LOC 2139Z 297DEG 10KT 3960 7434
HAIL...<.75IN
WIND...>34KTS
$$
MPS2 follow-up statements
851
FZUS71 KPHI 042158
MWSPHI
Marine Weather Statement
National Weather Service Mount Holly NJ
558 PM EDT Sun Jul 4 2021
ANZ451-042245-
/O.CON.KPHI.MA.W.0065.000000T0000Z-210704T2245Z/
558 PM EDT Sun Jul 4 2021
...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 645 PM EDT...
For the following areas...
Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20
nm...
At 558 PM EDT, a strong thunderstorm was located over Beach Haven,
moving southeast at 10 knots.
HAZARD...Wind gusts 34 knots or greater and small hail.
SOURCE...Radar indicated.
IMPACT...Small craft could be damaged in briefly higher winds and
suddenly higher waves.
Locations impacted include...
Beach Haven, Little Egg Reef and North Beach Haven.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to safe harbor until hazardous weather passes.
Report severe weather to the Coast Guard or the National Weather
Service.
&&
LAT...LON 3954 7414 3945 7420 3954 7441 3962 7426
3955 7412
TIME...MOT...LOC 2158Z 316DEG 12KT 3954 7429
HAIL...<.75IN
WIND...>34KTS
$$
MPS062
FZUS71 KPHI 042235
MWSPHI
Marine Weather Statement
National Weather Service Mount Holly NJ
635 PM EDT Sun Jul 4 2021
ANZ451-042245-
/O.EXP.KPHI.MA.W.0065.000000T0000Z-210704T2245Z/
635 PM EDT Sun Jul 4 2021
...THE SPECIAL MARINE WARNING WILL EXPIRE AT 645 PM EDT...
The affected areas were...
Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20
nm...
The thunderstorm has weakened and no longer poses a significant
threat to boaters.
LAT...LON 3954 7414 3945 7420 3954 7441 3962 7426
3955 7412
TIME...MOT...LOC 2235Z 297DEG 10KT 3949 7417
$$
MPSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 1:25 AM EDT | Dense Fog Advisory | PHI | Hunterdon, Warren | 7 hr |
| Jul 4, 3:01 PM EDT | Special Weather Statement | PHI | Ocean | 29 min |
| Jul 4, 3:02 PM EDT | Special Weather Statement | PHI | Burlington | 28 min |
| Jul 4, 3:04 PM EDT | Special Weather Statement | PHI | Ocean | 26 min |
| Jul 4, 3:28 PM EDT | Special Weather Statement | PHI | Burlington | 32 min |
| Jul 4, 4:05 PM EDT | Special Weather Statement | PHI | Burlington | 25 min |
| Jul 4, 4:39 PM EDT | Special Weather Statement | PHI | Ocean | 36 min |
| Jul 4, 5:38 PM EDT | Special Weather Statement | PHI | Ocean | 37 min |
| Jul 4, 6:23 PM EDT | Special Weather Statement | PHI | Atlantic | 37 min |
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.