Alert archive / New Jersey / Special Marine Warnings in 2021
Special Marine Warning 53, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this special marine warning at Jun 22, 2021, 12:51 PM EDT. It was in force for 114 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jun 22, 2021, 12:51 PM EDT (16:51 UTC)
- Expired
- Jun 22, 2021, 2:45 PM EDT
- In force
- 114 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), 46 km from the middle of the area, began a volume at 16:51 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 22, 1:32 PM EDT | MARINE TSTM WIND 44 | 1 Ssw North Cape May, NJ | AT CAPE MAY WEATHERFLOW GAUGE... PEAK GUST 48 MPH MEASURED AT 1:57 PM. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 12:00Z, 4.9 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
- 1075 J/kg
- Mixed-layer CIN
- -97 J/kg
- Mixed-layer LCL
- 1069 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 39 m²/s²
- 0-3 km storm-relative helicity
- 115 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.4
The text
As transmitted.
409
WHUS51 KPHI 221651
SMWPHI
ANZ430-431-221845-
/O.NEW.KPHI.MA.W.0053.210622T1651Z-210622T1845Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Mount Holly NJ
1251 PM EDT Tue Jun 22 2021
The National Weather Service in Mount Holly NJ has issued a
* Special Marine Warning for...
Delaware Bay...
* Until 245 PM EDT.
* At 1250 PM EDT, a surge of stronger winds was located along a line
extending from 22 nm east of Pea Patch Island to 13 nm east of
Miles River, moving east at 15 knots. Winds should remain elevated
for a couple of hours following the passage of the front.
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...
Brown Shoal Light, Fourteen Foot Bank Light, Slaughter Beach, Cape
Henlopen, East Point, Bowers Beach, Woodland Beach, Miah Maull
Light, Ship John Shoal Light, Brandywine Shoal Light, Fortesque
Beach, Sea Breeze, Cross Ledge Light, Cape May Point and Rehoboth
Beach.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to safe harbor immediately as gusty winds and high waves are
expected.
&&
LAT...LON 3930 7554 3948 7545 3946 7533 3943 7534
3944 7519 3927 7513 3926 7507 3929 7506
3942 7508 3941 7503 3930 7491 3923 7495
3913 7483 3872 7513 3881 7521 3879 7525
3882 7523 3905 7546 3918 7547 3923 7561
TIME...MOT...LOC 1650Z 281DEG 16KT 3969 7511 3873 7594
HAIL...0.00IN
WIND...>34KTS
$$
CMS3 follow-up statements
153
FZUS71 KPHI 221738
MWSPHI
Marine Weather Statement
National Weather Service Mount Holly NJ
138 PM EDT Tue Jun 22 2021
ANZ430-431-221845-
/O.CON.KPHI.MA.W.0053.000000T0000Z-210622T1845Z/
138 PM EDT Tue Jun 22 2021
...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 245 PM EDT...
For the following areas...
Delaware Bay waters north of East Point NJ to Slaughter Beach DE...
Delaware Bay waters south of East Point NJ to Slaughter Beach DE...
At 137 PM EDT, strong northwest winds were occurring on Delaware Bay
in response to a frontal passage. Gusts to 39 knots were observed
recently near the Cape May Ferry. These strong winds will likely
continue for the next hour.
HAZARD...Wind gusts to 40 knots.
SOURCE...Surface observations.
IMPACT...Small craft could be damaged in briefly higher winds and
suddenly higher waves.
Locations impacted include...
Brown Shoal Light, Fourteen Foot Bank Light, Slaughter Beach, Cape
Henlopen, East Point, Bowers Beach, Woodland Beach, Miah Maull Light,
Ship John Shoal Light, Brandywine Shoal Light, Fortesque Beach, Sea
Breeze, Cross Ledge Light, Cape May Point and Rehoboth Beach.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to safe harbor immediately as gusty winds and high waves are
expected.
&&
LAT...LON 3930 7554 3948 7545 3946 7533 3943 7534
3944 7519 3927 7513 3926 7507 3929 7506
3942 7508 3941 7503 3930 7491 3923 7495
3913 7483 3872 7513 3881 7521 3879 7525
3882 7523 3905 7546 3918 7547 3923 7561
TIME...MOT...LOC 1737Z 294DEG 28KT 3958 7476 3863 7559
HAIL...0.00IN
WIND...40KTS
$$
CMS489
FZUS71 KPHI 221759
MWSPHI
Marine Weather Statement
National Weather Service Mount Holly NJ
159 PM EDT Tue Jun 22 2021
ANZ430-431-221845-
/O.CON.KPHI.MA.W.0053.000000T0000Z-210622T1845Z/
159 PM EDT Tue Jun 22 2021
...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 245 PM EDT...
For the following areas...
Delaware Bay waters north of East Point NJ to Slaughter Beach DE...
Delaware Bay waters south of East Point NJ to Slaughter Beach DE...
At 158 PM EDT, strong winds continued across Delaware Bay. Gusts
were exceeding 40 knots at Cape May and at Lewes. These strong winds
will likely continue for the next hour.
HAZARD...Wind gusts to 40 knots.
SOURCE...Surface observations.
IMPACT...Small craft could be damaged in briefly higher winds and
suddenly higher waves.
Locations impacted include...
Brown Shoal Light, Fourteen Foot Bank Light, Slaughter Beach, Cape
Henlopen, East Point, Bowers Beach, Woodland Beach, Miah Maull Light,
Ship John Shoal Light, Brandywine Shoal Light, Fortesque Beach, Sea
Breeze, Cross Ledge Light, Cape May Point and Rehoboth Beach.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to safe harbor immediately as gusty winds and high waves are
expected.
&&
LAT...LON 3930 7554 3948 7545 3946 7533 3943 7534
3944 7519 3927 7513 3926 7507 3929 7506
3942 7508 3941 7503 3930 7491 3923 7495
3913 7483 3872 7513 3881 7521 3879 7525
3882 7523 3905 7546 3918 7547 3923 7561
TIME...MOT...LOC 1758Z 281DEG 16KT 3956 7465 3861 7549
HAIL...0.00IN
WIND...40KTS
$$
CMS723
FZUS71 KPHI 221842
MWSPHI
Marine Weather Statement
National Weather Service Mount Holly NJ
242 PM EDT Tue Jun 22 2021
ANZ430-431-221850-
/O.EXP.KPHI.MA.W.0053.000000T0000Z-210622T1845Z/
242 PM EDT Tue Jun 22 2021
...THE SPECIAL MARINE WARNING WILL EXPIRE AT 245 PM EDT...
The affected areas were...
Delaware Bay...
The stronger winds have diminished and are now confined to far lower
portions of Delaware Bay, where a special marine warning remains in
effect. Mariners should continue to exercise caution on Delaware
Bay, as frequent gusts up to 30 knots are still possible.
LAT...LON 3930 7554 3948 7545 3946 7533 3943 7534
3944 7519 3927 7513 3926 7507 3929 7506
3942 7508 3941 7503 3930 7491 3923 7495
3913 7483 3872 7513 3881 7521 3879 7525
3882 7523 3905 7546 3918 7547 3923 7561
TIME...MOT...LOC 1840Z 281DEG 16KT 3952 7442 3858 7526
$$
CMSThe 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 21, 10:01 PM EDT | Special Marine Warning | PHI | 29 min | |
| Jun 22, 11:46 AM EDT | Special Marine Warning | PHI | 44 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.