Alert archive / New Jersey / Special Marine Warnings in 2021
Special Marine Warning 51, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this special marine warning at Jun 21, 2021, 10:01 PM EDT. It was in force for 29 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
- Jun 21, 2021, 10:01 PM EDT (02:01 UTC)
- Expired
- Jun 21, 2021, 10:30 PM EDT
- In force
- 29 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 34.0 mph
The radar
The Dover AFB radar (KDOX), 55 km from the middle of the area, began a volume at 02:04 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, 2.0 hours before the alert went out and 153 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
- 1131 J/kg
- Mixed-layer CIN
- -101 J/kg
- Mixed-layer LCL
- 1172 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 106 m²/s²
- 0-3 km storm-relative helicity
- 165 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
546
WHUS51 KPHI 220201
SMWPHI
ANZ430-431-220230-
/O.NEW.KPHI.MA.W.0051.210622T0201Z-210622T0230Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
1001 PM EDT Mon Jun 21 2021
The National Weather Service in Mount Holly NJ has issued a
* Special Marine Warning for...
Delaware Bay...
* Until 1030 PM EDT.
* At 1000 PM EDT, a strong thunderstorm was located near Ship John
Shoal Light, moving east at 40 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...
Fortesque Beach, Sea Breeze, Fourteen Foot Bank Light, East Point,
Bowers Beach, Woodland Beach, Miah Maull Light, Ship John Shoal
Light and Cross Ledge Light.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
&&
LAT...LON 3945 7533 3943 7534 3943 7530 3946 7520
3935 7518 3930 7512 3927 7513 3922 7491
3896 7529 3910 7547 3918 7547 3920 7554
3946 7556
TIME...MOT...LOC 0200Z 263DEG 38KT 3926 7544
HAIL...<.75IN
WIND...>34KTS
$$
NCThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 8:13 PM EDT | Severe Thunderstorm Warning | PHI | Morris, Sussex, Warren | 62 min |
| Jun 21, 8:31 PM EDT | Special Marine Warning | PHI | 59 min | |
| Jun 22, 11:46 AM EDT | Special Marine Warning | PHI | 44 min | |
| Jun 22, 12:51 PM EDT | Special Marine Warning | PHI | 114 min | |
| Jun 22, 1:25 PM EDT | Special Marine Warning | PHI | 65 min | |
| Jun 22, 1:47 PM EDT | Special Marine Warning | PHI | 118 min | |
| Jun 22, 2:27 PM EDT | Special Marine Warning | PHI | 93 min | |
| Jun 22, 3:05 PM EDT | Small Craft Advisory | PHI | 15 hr | |
| Jun 22, 3:26 PM EDT | Special Marine Warning | PHI | 68 min | |
| Jun 21, 9:28 PM EDT | Special Weather Statement | PHI | Kent | 47 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.