Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 102, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 14, 2021, 12:08 PM EDT for Barnstable County, Plymouth County, Massachusetts. It was in force for 27 min. 4 reports 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
- Aug 14, 2021, 12:08 PM EDT (16:08 UTC)
- Expired
- Aug 14, 2021, 12:35 PM EDT
- In force
- 27 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Barnstable County, MA, Plymouth County, MA
The radar
The Boston radar (KBOX), 57 km from the middle of the area, began a volume at 16:10 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 |
|---|---|---|---|
| Aug 14, 12:15 PM EDT | TSTM WND DMG | Bourne, MA | 2 LARGE LIMBS DOWN ON PURITAN ROAD AT WALL ST |
| Aug 14, 12:15 PM EDT | TSTM WND DMG | Bourne, MA | TWO TREES DOWN ON WIRES ON SNOW CIRCLE |
| Aug 14, 12:20 PM EDT | MARINE TSTM WIND 50 | Sandwich, MA | |
| Aug 14, 12:22 PM EDT | TSTM WND DMG | Sandwich, MA | MANY LARGE BRANCHES DOWN ON SANDWICH ROAD AT BEN ABBEY DRIVE. LARGE BRANCHES WERE ALSO DOWN ON WIRES ON TYLER DRIVE. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 4.1 hours before the alert went out and 218 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
- 748 J/kg
- Mixed-layer CIN
- -93 J/kg
- Mixed-layer LCL
- 1208 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 90 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
765
WUUS51 KBOX 141608
SVRBOX
MAC001-023-141715-
/O.NEW.KBOX.SV.W.0102.210814T1608Z-210814T1715Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
1208 PM EDT Sat Aug 14 2021
The National Weather Service in Boston/Norton has issued a
* Severe Thunderstorm Warning for...
Central Barnstable County in southeastern Massachusetts...
Southeastern Plymouth County in southeastern Massachusetts...
* Until 115 PM EDT.
* At 1208 PM EDT, a severe thunderstorm was located over Bourne, or 8
miles northeast of Marion, moving east at 25 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Expect wind damage to trees and power lines. Minor hail
damage to vehicles is possible.
* Locations impacted include...
Plymouth, Barnstable, Brewster, Yarmouth, Wareham, Sandwich,
Bourne, Dennis, Mashpee and Harwich.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4166 7063 4168 7063 4166 7065 4172 7063
4170 7062 4175 7063 4174 7066 4173 7064
4170 7065 4170 7067 4181 7072 4186 7053
4182 7054 4176 7047 4172 7030 4172 7035
4171 7033 4178 7005 4168 7003
TIME...MOT...LOC 1608Z 257DEG 21KT 4176 7061
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Chai3 follow-up statements
627
WWUS51 KBOX 141626
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
1226 PM EDT Sat Aug 14 2021
MAC001-023-141715-
/O.CON.KBOX.SV.W.0102.000000T0000Z-210814T1715Z/
Barnstable MA-Plymouth MA-
1226 PM EDT Sat Aug 14 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 115 PM EDT
FOR CENTRAL BARNSTABLE AND SOUTHEASTERN PLYMOUTH COUNTIES...
At 1224 PM EDT, a severe thunderstorm was located near Sandwich, or
10 miles southeast of Plymouth, moving east at 25 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated and train spotter reported. Weather station
reported a sustained 40 mph wind with 50 mph gust at
Sandwich Marina.
IMPACT...Expect wind damage to trees and power lines. Minor hail
damage to vehicles is possible.
Locations impacted include...
Plymouth, Barnstable, Brewster, Yarmouth, Wareham, Sandwich, Bourne,
Dennis, Mashpee and Harwich.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4166 7063 4168 7063 4166 7065 4172 7063
4170 7062 4175 7063 4174 7066 4173 7064
4170 7065 4170 7067 4181 7072 4186 7053
4182 7054 4176 7047 4172 7030 4172 7035
4171 7033 4178 7005 4168 7003
TIME...MOT...LOC 1624Z 257DEG 21KT 4178 7049
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Chai654
WWUS51 KBOX 141628
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
1228 PM EDT Sat Aug 14 2021
MAC001-023-141715-
/O.CON.KBOX.SV.W.0102.000000T0000Z-210814T1715Z/
Barnstable MA-Plymouth MA-
1228 PM EDT Sat Aug 14 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 115 PM EDT
FOR CENTRAL BARNSTABLE AND SOUTHEASTERN PLYMOUTH COUNTIES...
At 1226 PM EDT, a severe thunderstorm was located near Sandwich, or
10 miles northwest of Barnstable, moving east at 25 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated and public. At 1222 PM, amateur radio
reported tree down on Sandwich Road at Ben Abbey Drive as
well as tree down on 6 Tyler Drive.
IMPACT...Expect wind damage to trees and power lines. Minor hail
damage to vehicles is possible.
Locations impacted include...
Plymouth, Barnstable, Brewster, Yarmouth, Wareham, Sandwich, Bourne,
Dennis, Mashpee and Harwich.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4166 7063 4168 7063 4166 7065 4172 7063
4170 7062 4175 7063 4174 7066 4173 7064
4170 7065 4170 7067 4181 7072 4186 7053
4182 7054 4176 7047 4172 7030 4172 7035
4171 7033 4178 7005 4168 7003
TIME...MOT...LOC 1626Z 257DEG 21KT 4178 7047
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Chai424
WWUS51 KBOX 141635
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
1235 PM EDT Sat Aug 14 2021
MAC001-023-141645-
/O.CAN.KBOX.SV.W.0102.000000T0000Z-210814T1715Z/
Barnstable MA-Plymouth MA-
1235 PM EDT Sat Aug 14 2021
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL BARNSTABLE AND
SOUTHEASTERN PLYMOUTH COUNTIES IS CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.
LAT...LON 4166 7063 4168 7063 4166 7065 4172 7063
4170 7062 4175 7063 4174 7066 4173 7064
4170 7065 4170 7067 4181 7072 4186 7053
4182 7054 4176 7047 4172 7030 4172 7035
4171 7033 4178 7005 4168 7003
TIME...MOT...LOC 1634Z 257DEG 21KT 4179 7040
$$
ChaiThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 8:48 PM EDT | Special Weather Statement | BOX | Franklin | 57 min |
| Aug 14, 12:04 PM EDT | Special Weather Statement | BOX | Barnstable | 56 min |
| Aug 14, 12:07 PM EDT | Special Marine Warning | BOX | 68 min |
Nearby
Severe Thunderstorm Warnings in Massachusetts, 2021Every severe thunderstorm 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.