Alert archive / New Jersey / Special Marine Warnings in 2021
Special Marine Warning 113, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this special marine warning at Aug 13, 2021, 9:26 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
- Aug 13, 2021, 9:26 PM EDT (01:26 UTC)
- Expired
- Aug 13, 2021, 10:30 PM EDT
- In force
- 64 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.0 in
- Wind
- 34.0 mph
The radar
The Dover AFB radar (KDOX), 60 km from the middle of the area, began a volume at 01:26 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, 1.4 hours before the alert went out and 88 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
- 2917 J/kg
- Mixed-layer CIN
- -55 J/kg
- Mixed-layer LCL
- 1083 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 46 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
561
WHUS51 KPHI 140126
SMWPHI
ANZ431-453>455-475-140230-
/O.NEW.KPHI.MA.W.0113.210814T0126Z-210814T0230Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
926 PM EDT Fri Aug 13 2021
The National Weather Service in Mount Holly NJ has issued a
* Special Marine Warning for...
Lower Delaware Bay...
Coastal waters from Great Egg Inlet NJ to Fenwick Island DE out 20
nm...
Outer waters from Cape May NJ to Fenwick Island DE out 20 to 40
nm...
* Until 1030 PM EDT.
* At 926 PM EDT, a strong thunderstorm was located near Cape
Henlopen, moving east at 15 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...
Five Fathoms Buoy, Fenwick Island, Buoy 4fb, Buoy 3fb, Cape
Henlopen, Rehoboth Beach, Cape May Point, Indian River Inlet
Bridge, Overfalls Shoal, Cape May Reef, Bethany Beach, Delaware
Lightship Buoy 44009 and Buoy 2ms.
LAT...LON 3835 7471 3845 7503 3845 7509 3883 7520
3899 7496 3895 7461 3854 7446 3833 7463
TIME...MOT...LOC 0126Z 271DEG 14KT 3876 7514
HAIL...0.00IN
WIND...>34KTS
$$
NC1 follow-up statement
446
FZUS71 KPHI 140221
MWSPHI
Marine Weather Statement
National Weather Service Mount Holly NJ
1021 PM EDT Fri Aug 13 2021
ANZ431-453>455-475-140230-
/O.EXP.KPHI.MA.W.0113.000000T0000Z-210814T0230Z/
1021 PM EDT Fri Aug 13 2021
...THE SPECIAL MARINE WARNING WILL EXPIRE AT 1030 PM EDT...
The affected areas were...
Lower Delaware Bay...
Coastal waters from Great Egg Inlet NJ to Fenwick Island DE out 20
nm...
Outer waters from Cape May NJ to Fenwick Island DE out 20 to 40 nm...
The thunderstorm has weakened and no longer poses a significant
threat to boaters.
LAT...LON 3835 7471 3845 7503 3845 7509 3883 7520
3899 7496 3895 7461 3854 7446 3833 7463
TIME...MOT...LOC 0220Z 271DEG 14KT 3876 7488
$$
NCThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 8:04 PM EDT | Special Weather Statement | PHI | Sussex | 41 min |
| Aug 13, 8:28 PM EDT | Special Weather Statement | PHI | Sussex | 62 min |
| Aug 13, 8:40 PM EDT | Areal Flood Advisory | PHI | Sussex | 62 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.