Alert archive / New Jersey / Special Marine Warnings in 2021
Special Marine Warning 147, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this special marine warning at Dec 6, 2021, 7:20 PM EST. It was in force for 47 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
- Dec 6, 2021, 7:20 PM EST (00:20 UTC)
- Expired
- Dec 6, 2021, 8:07 PM EST
- In force
- 47 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.0 in
- Wind
- 40.0 mph
The radar
The Dover AFB radar (KDOX), 82 km from the middle of the area, began a volume at 00:23 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
Washington/Dulle, VA (KIAD), launched 00:00Z, 0.3 hours before the alert went out and 177 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
- 4 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 1686 m above ground
- 0-6 km bulk shear
- 84 kt
- 0-1 km storm-relative helicity
- 11 m²/s²
- 0-3 km storm-relative helicity
- 90 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
625
WHUS51 KPHI 070020
SMWPHI
ANZ430-070145-
/O.NEW.KPHI.MA.W.0147.211207T0020Z-211207T0145Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
720 PM EST Mon Dec 6 2021
The National Weather Service in Mount Holly NJ has issued a
* Special Marine Warning for...
Upper Delaware Bay...
* Until 845 PM EST.
* At 718 PM EST, heavy showers were located along a line extending
from 22 nm north of Pea Patch Island to near Aberdeen Proving
Ground, moving east at 40 knots.
HAZARD...Wind gusts to 40 knots and an abrupt wind shift to the
west northwest.
SOURCE...Radar.
IMPACT...Small craft could be damaged in briefly higher winds and
suddenly higher waves.
* Locations impacted include...
Woodland Beach, Stony Point, Pea Patch Island and Reedy Point.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to safe harbor immediately as gusty winds and high waves are
expected.
&&
LAT...LON 3961 7562 3974 7557 3972 7544 3969 7544
3968 7542 3960 7539 3950 7550 3934 7529
3931 7553 3946 7561 3950 7562
TIME...MOT...LOC 0018Z 268DEG 38KT 3995 7546 3942 7612
HAIL...0.00IN
WIND...40KTS
$$
Gorse2 follow-up statements
831
FZUS71 KPHI 070048
MWSPHI
Marine Weather Statement
National Weather Service Mount Holly NJ
748 PM EST Mon Dec 6 2021
ANZ430-070145-
/O.CON.KPHI.MA.W.0147.000000T0000Z-211207T0145Z/
748 PM EST Mon Dec 6 2021
...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 845 PM EST...
For the following areas...
Delaware Bay waters north of East Point NJ to Slaughter Beach DE...
At 747 PM EST, heavy showers were located along a line extending
from 15 nm northeast of Pea Patch Island to 13 nm west of Woodland
Beach, moving east at 35 knots.
HAZARD...Wind gusts to 40 knots and an abrupt wind shift to the west
northwest.
SOURCE...Radar indicated.
IMPACT...Small craft could be damaged in briefly higher winds and
suddenly higher waves.
Locations impacted include...
Woodland Beach, Stony Point, Pea Patch Island and Reedy Point.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to safe harbor immediately as gusty winds and high waves are
expected.
&&
LAT...LON 3961 7562 3974 7557 3972 7544 3969 7544
3968 7542 3960 7539 3950 7550 3934 7529
3931 7553 3946 7561 3950 7562
TIME...MOT...LOC 0047Z 283DEG 34KT 3973 7528 3934 7576
HAIL...0.00IN
WIND...40KTS
$$
Gorse113
FZUS71 KPHI 070107
MWSPHI
Marine Weather Statement
National Weather Service Mount Holly NJ
807 PM EST Mon Dec 6 2021
ANZ430-070117-
/O.CAN.KPHI.MA.W.0147.000000T0000Z-211207T0145Z/
807 PM EST Mon Dec 6 2021
...THE SPECIAL MARINE WARNING IS CANCELLED...
The affected areas were...
Upper Delaware Bay...
The band of heavy showers will clear the warned area shortly. Also,
a Gale Warning is now in effect.
LAT...LON 3961 7562 3974 7557 3972 7544 3969 7544
3968 7542 3960 7539 3950 7550 3934 7529
3931 7553 3946 7561 3950 7562
TIME...MOT...LOC 0103Z 268DEG 38KT 3974 7505 3935 7553
$$
GorseThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 7, 1:56 AM EST | Small Craft Advisory | PHI | 8 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.