Alert archive / Massachusetts / Special Marine Warnings in 2021
Special Marine Warning 13, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this special marine warning at Jun 22, 2021, 3:07 PM EDT. It was in force for 53 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 22, 2021, 3:07 PM EDT (19:07 UTC)
- Expired
- Jun 22, 2021, 4:00 PM EDT
- In force
- 53 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 49.0 mph
The radar
The Boston radar (KBOX), 49 km from the middle of the area, began a volume at 19:07 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
Gray, ME (KGYX), launched 12:00Z, 7.1 hours before the alert went out and 191 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
- 47 J/kg
- Mixed-layer CIN
- -102 J/kg
- Mixed-layer LCL
- 851 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- -37 m²/s²
- 0-3 km storm-relative helicity
- 86 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.0
The text
As transmitted.
953
WHUS51 KBOX 221907
SMWBOX
ANZ250-251-222000-
/O.NEW.KBOX.MA.W.0013.210622T1907Z-210622T2000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Special Marine Warning
National Weather Service Boston/Norton MA
307 PM EDT Tue Jun 22 2021
The National Weather Service in Boston/Norton has issued a
* Special Marine Warning for...
Coastal waters east of Ipswich Bay and the Stellwagen Bank National
Marine Sanctuary...
Massachusetts Bay and Ipswich Bay...
* Until 400 PM EDT.
* At 307 PM EDT, a strong thunderstorm was located near Patience
Island, moving northeast at 35 knots.
HAZARD...Wind gusts to nearly 50 knots and small hail.
SOURCE...Radar.
IMPACT...Small craft could be damaged in briefly higher winds and
suddenly higher waves.
* Locations impacted include...
Boston Buoy 44013, Duxbury Pier Light, The Coastal Waters East Of
Boston Harbor, Scituate Harbor, Minot Light, Green Harbor, Ocean
Bluff-Brant Rock and Gurnet Point.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to safe harbor until hazardous weather passes.
&&
LAT...LON 4249 7059 4222 7002 4197 7069 4200 7073
4202 7069 4211 7068 4215 7075 4221 7074
4225 7082
TIME...MOT...LOC 1907Z 237DEG 36KT 4198 7089
HAIL...<.75IN
WIND...49KTS
$$
BL1 follow-up statement
256
FZUS71 KBOX 221934
MWSBOX
Marine Weather Statement
National Weather Service Boston/Norton MA
334 PM EDT Tue Jun 22 2021
ANZ250-251-222000-
/O.CON.KBOX.MA.W.0013.000000T0000Z-210622T2000Z/
334 PM EDT Tue Jun 22 2021
...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 400 PM EDT...
For the following areas...
Coastal waters east of Ipswich Bay and the Stellwagen Bank National
Marine Sanctuary...
Massachusetts Bay and Ipswich Bay...
At 334 PM EDT, a strong thunderstorm was located 8 nm northeast of
Ocean Bluff-Brant Rock, moving northeast at 45 knots.
HAZARD...Wind gusts to 40 knots and small hail.
SOURCE...Radar indicated.
IMPACT...Small craft could be damaged in briefly higher winds and
suddenly higher waves.
Locations impacted include...
Boston Buoy 44013, The Coastal Waters East Of Boston Harbor, Scituate
Harbor, Green Harbor and Ocean Bluff-Brant Rock.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to safe harbor until hazardous weather passes.
&&
LAT...LON 4249 7059 4222 7002 4200 7061 4202 7064
4211 7068 4215 7075 4216 7075 4221 7074
4223 7075
TIME...MOT...LOC 1934Z 236DEG 46KT 4217 7050
HAIL...<.75IN
WIND...40KTS
$$
BLThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 10:50 PM EDT | Special Weather Statement | BOX | Franklin | 40 min |
| Jun 22, 3:38 AM EDT | Rip Current Statement | BOX | Dukes, Nantucket | 15 hr |
| Jun 22, 1:52 PM EDT | Severe Thunderstorm Warning | BOX | Bristol | 38 min |
| Jun 22, 2:00 PM EDT | Severe Thunderstorm Warning | BOX | Bristol, Norfolk, Plymouth, Suffolk | 45 min |
| Jun 22, 2:14 PM EDT | Special Marine Warning | BOX | 31 min | |
| Jun 22, 2:33 PM EDT | Special Weather Statement | BOX | Plymouth | 42 min |
| Jun 22, 2:43 PM EDT | Special Weather Statement | BOX | Plymouth | 32 min |
| Jun 22, 3:06 PM EDT | Severe Thunderstorm Warning | BOX | Bristol, Plymouth | 23 min |
| Jun 22, 3:41 PM EDT | Special Marine Warning | BOX | 64 min | |
| Jun 22, 4:42 PM EDT | Special Weather Statement | BOX | Norfolk, Suffolk | 48 min |
| Jun 22, 1:39 PM EDT | Special Weather Statement | BOX | Bristol | 51 min |
| Jun 22, 1:41 PM EDT | Special Weather Statement | BOX | Bristol, Kent, Providence | 49 min |
Nearby
Special Marine Warnings in Massachusetts, 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.