Alert archive / New Jersey / Special Marine Warnings in 2021
Special Marine Warning 5, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this special marine warning at Mar 18, 2021, 11:23 PM EDT. It was in force for 20 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
- Mar 18, 2021, 11:23 PM EDT (03:23 UTC)
- Expired
- Mar 18, 2021, 11:43 PM EDT
- In force
- 20 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), 106 km from the middle of the area, began a volume at 03:24 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, 3.4 hours before the alert went out and 114 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
- 791 J/kg
- Mixed-layer CIN
- -41 J/kg
- Mixed-layer LCL
- 450 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 155 m²/s²
- 0-3 km storm-relative helicity
- 251 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.3
The text
As transmitted.
776
WHUS51 KPHI 190323
SMWPHI
ANZ475-190400-
/O.NEW.KPHI.MA.W.0005.210319T0323Z-210319T0400Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
1123 PM EDT Thu Mar 18 2021
The National Weather Service in Mount Holly NJ has issued a
* Special Marine Warning for...
Outer waters from Cape May NJ to Fenwick Island DE out 20 to 40 nm...
* Until midnight EDT.
* At 1122 PM EDT, a strong thunderstorm was located 13 nm north of
Chicken Bone, 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.
* The strong thunderstorm will remain over mainly open waters.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
Move to safe harbor until hazardous weather passes.
&&
LAT...LON 3850 7449 3864 7417 3861 7417 3857 7420
3851 7426 3843 7426 3837 7427 3836 7427
3833 7439
TIME...MOT...LOC 0322Z 246DEG 42KT 3845 7436
HAIL...0.00IN
WIND...>34KTS
$$
MPS1 follow-up statement
670
FZUS71 KPHI 190343
MWSPHI
Marine Weather Statement
National Weather Service Mount Holly NJ
1143 PM EDT Thu Mar 18 2021
ANZ475-190353-
/O.CAN.KPHI.MA.W.0005.000000T0000Z-210319T0400Z/
1143 PM EDT Thu Mar 18 2021
...THE SPECIAL MARINE WARNING IS CANCELLED...
The affected areas were...
Outer waters from Cape May NJ to Fenwick Island DE out 20 to 40 nm...
The thunderstorm has moved out of the area and no longer poses a
significant threat to boaters.
LAT...LON 3850 7449 3864 7417 3861 7417 3857 7420
3851 7426 3843 7426 3837 7427 3836 7427
3833 7439
TIME...MOT...LOC 0341Z 246DEG 42KT 3855 7407
$$
MPSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 19, 12:52 PM 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.