Alert archive / New Jersey / Special Marine Warnings in 2021
Special Marine Warning 2, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this special marine warning at Jan 20, 2021, 1:00 PM EST. It was in force for 65 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
- Jan 20, 2021, 1:00 PM EST (18:00 UTC)
- Expired
- Jan 20, 2021, 2:05 PM EST
- In force
- 65 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.0 in
- Wind
- 40.0 mph
The radar
The Philadelphia radar (KDIX), 74 km from the middle of the area, began a volume at 18:00 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, 6.0 hours before the alert went out and 143 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
- 1247 m above ground
- 0-6 km bulk shear
- 74 kt
- 0-1 km storm-relative helicity
- -7 m²/s²
- 0-3 km storm-relative helicity
- 195 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
627
WHUS51 KPHI 201800
SMWPHI
ANZ450>452-470>473-202000-
/O.NEW.KPHI.MA.W.0002.210120T1800Z-210120T2000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
100 PM EST Wed Jan 20 2021
The National Weather Service in Mount Holly NJ has issued a
* Special Marine Warning for...
Coastal waters from Sandy Hook to Great Egg Inlet NJ out 20 nm...
Outer waters from Sandy Hook to Cape May NJ out 20 to 40 nm...
* Until 300 PM EST.
* At 1256 PM EST, showers were located along a line extending from 6
nm northeast of Shark River Reef to 8 nm southeast of Barnegat
Light Reef to Little Egg Inlet, moving southeast at 30 knots.
HAZARD...Wind gusts to 40 knots.
SOURCE...Radar.
IMPACT...Small craft could be damaged in briefly higher winds and
suddenly higher waves.
* Locations impacted include...
Beach Haven, Barnegat Light, North Beach Haven, Garden State North
Reef, Little Egg Reef, Shark River Reef, Little Egg Inlet, Ship
Bottom, Barnegat Light Reef, Garden State South Reef, Harvey Cedars
and Brigantine.
LAT...LON 3956 7334 3936 7344 3894 7378 3947 7444
3989 7401 4027 7368 4026 7365 3994 7337
3982 7331 3971 7330
TIME...MOT...LOC 1756Z 308DEG 28KT 4020 7360 3974 7387 3948 7431
HAIL...0.00IN
WIND...40KTS
$$
Robertson2 follow-up statements
446
FZUS71 KPHI 201829
MWSPHI
Marine Weather Statement
National Weather Service Mount Holly NJ
129 PM EST Wed Jan 20 2021
ANZ450-201839-
/O.CAN.KPHI.MA.W.0002.000000T0000Z-210120T2000Z/
129 PM EST Wed Jan 20 2021
...THE SPECIAL MARINE WARNING IS CANCELLED...
The affected areas were...
Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 nm...
The showers have moved out of the warned area and no longer pose a
significant threat to boaters.
LAT...LON 3895 7377 3935 7422 3968 7373 4008 7350
3994 7337 3982 7331 3971 7330 3956 7334
3936 7344
TIME...MOT...LOC 1829Z 308DEG 28KT 4007 7338 3961 7365 3935 7409
$$
ANZ451-452-470>473-202000-
/O.CON.KPHI.MA.W.0002.000000T0000Z-210120T2000Z/
129 PM EST Wed Jan 20 2021
...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 300 PM EST...
For the following areas...
Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20
nm...
Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20
nm...
Waters from Great Egg Inlet NJ to Cape May NJ out 20 to 40 nm...
Waters from Little Egg Inlet NJ to Great Egg Inlet NJ out 20 to 40 nm
from 20 to 40 NM...
Waters from Manasquan Inlet NJ to Little Egg Inlet NJ out 20 to 40
nm...
Waters from Sandy Hook NJ to Manasquan Inlet NJ out 20 to 40 nm...
At 129 PM EST, showers were located along a line extending from 14 nm
southwest of Buoy 44025 to 18 nm east of Garden State North Reef to 9
nm northeast of Atlantic City Reef, moving southeast at 30 knots.
HAZARD...Wind gusts to 40 knots.
SOURCE...Radar indicated.
IMPACT...Small craft could be damaged in briefly higher winds and
suddenly higher waves.
The showers will remain over mainly open waters.
LAT...LON 3895 7377 3935 7422 3968 7373 4008 7350
3994 7337 3982 7331 3971 7330 3956 7334
3936 7344
TIME...MOT...LOC 1829Z 308DEG 28KT 4007 7338 3961 7365 3935 7409
HAIL...0.00IN
WIND...40KTS
$$
Robertson492
FZUS71 KPHI 201905
MWSPHI
Marine Weather Statement
National Weather Service Mount Holly NJ
205 PM EST Wed Jan 20 2021
ANZ451-452-470>473-201914-
/O.CAN.KPHI.MA.W.0002.000000T0000Z-210120T2000Z/
205 PM EST Wed Jan 20 2021
...THE SPECIAL MARINE WARNING IS CANCELLED...
The affected areas were...
Coastal waters from Manasquan Inlet to Great Egg Inlet NJ out 20
nm...
Outer waters from Sandy Hook to Cape May NJ out 20 to 40 nm...
The showers have weakened and no longer pose a significant threat to
boaters.
LAT...LON 3895 7377 3935 7422 3968 7373 4008 7350
3994 7337 3982 7331 3971 7330 3956 7334
3936 7344
TIME...MOT...LOC 1900Z 308DEG 28KT 3992 7313 3946 7340 3920 7384
$$
RobertsonThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 20, 9:52 AM EST | Special Weather Statement | PHI | Hunterdon, Somerset, Warren | 53 min |
| Jan 20, 10:42 AM EST | Special Weather Statement | PHI | Hunterdon, Mercer, Middlesex, Monmouth, Morris, Somerset | 63 min |
| Jan 20, 12:02 PM EST | Special Marine Warning | PHI | 58 min | |
| Jan 20, 8:56 AM EST | Special Weather Statement | PHI | Carbon, Monroe | 49 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.