Alert archive / Massachusetts / Tornado Warnings in 2021
Tornado Warning 3, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this tornado warning at Aug 19, 2021, 12:49 PM EDT for Essex County, Middlesex County, Suffolk County, Massachusetts. It was in force for 39 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
- Aug 19, 2021, 12:49 PM EDT (16:49 UTC)
- Expired
- Aug 19, 2021, 1:28 PM EDT
- In force
- 39 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
Counties Essex County, MA, Middlesex County, MA, Suffolk County, MA
The radar
The Boston radar (KBOX), 61 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.
The nearest sounding before it
Gray, ME (KGYX), launched 12:00Z, 4.8 hours before the alert went out and 166 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
- 110 J/kg
- Mixed-layer CIN
- -40 J/kg
- Mixed-layer LCL
- 884 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 36 m²/s²
- 0-3 km storm-relative helicity
- 68 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
398
WFUS51 KBOX 191649
TORBOX
MAC009-017-025-191745-
/O.NEW.KBOX.TO.W.0003.210819T1649Z-210819T1745Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Boston/Norton MA
1249 PM EDT Thu Aug 19 2021
The National Weather Service in Boston/Norton has issued a
* Tornado Warning for...
North central Suffolk County in eastern Massachusetts...
South central Essex County in northeastern Massachusetts...
East central Middlesex County in northeastern Massachusetts...
* Until 145 PM EDT.
* At 1249 PM EDT, a severe thunderstorm capable of producing a
tornado was located over Revere, moving northeast at 15 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* This dangerous storm will be near...
Lynn and Nahant around 105 PM EDT.
Swampscott around 120 PM EDT.
Salem around 125 PM EDT.
Marblehead around 130 PM EDT.
Beverly around 145 PM EDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4257 7080 4253 7078 4255 7082 4254 7090
4254 7087 4250 7089 4252 7085 4250 7085
4246 7094 4242 7091 4245 7094 4245 7097
4241 7099 4237 7097 4237 7099 4238 7101
4235 7099 4245 7114 4262 7086
TIME...MOT...LOC 1649Z 240DEG 13KT 4242 7102
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
Chai2 follow-up statements
506
WWUS51 KBOX 191711
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
111 PM EDT Thu Aug 19 2021
MAC025-191721-
/O.CAN.KBOX.TO.W.0003.000000T0000Z-210819T1745Z/
Suffolk MA-
111 PM EDT Thu Aug 19 2021
...THE TORNADO WARNING FOR NORTH CENTRAL SUFFOLK COUNTY IS
CANCELLED...
The tornadic thunderstorm which prompted the warning has moved out
of the warned area. Therefore, the warning has been cancelled.
LAT...LON 4257 7080 4253 7078 4255 7082 4254 7090
4254 7087 4251 7089 4252 7085 4250 7085
4249 7094 4250 7106 4262 7086
TIME...MOT...LOC 1711Z 240DEG 13KT 4246 7093
$$
MAC009-017-191745-
/O.CON.KBOX.TO.W.0003.000000T0000Z-210819T1745Z/
Essex MA-Middlesex MA-
111 PM EDT Thu Aug 19 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 145 PM EDT FOR SOUTH
CENTRAL ESSEX AND EASTERN MIDDLESEX COUNTIES...
At 111 PM EDT, a severe thunderstorm capable of producing a tornado
was located over Swampscott, or over Lynn, moving northeast at 15
mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This dangerous storm will be near...
Salem around 125 PM EDT.
Marblehead around 130 PM EDT.
Beverly around 150 PM EDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4257 7080 4253 7078 4255 7082 4254 7090
4254 7087 4251 7089 4252 7085 4250 7085
4249 7094 4250 7106 4262 7086
TIME...MOT...LOC 1711Z 240DEG 13KT 4246 7093
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
Chai999
WWUS51 KBOX 191728
SVSBOX
Severe Weather Statement
National Weather Service Boston/Norton MA
128 PM EDT Thu Aug 19 2021
MAC009-017-191738-
/O.CAN.KBOX.TO.W.0003.000000T0000Z-210819T1745Z/
Essex MA-Middlesex MA-
128 PM EDT Thu Aug 19 2021
...THE TORNADO WARNING FOR SOUTH CENTRAL ESSEX AND EASTERN MIDDLESEX
COUNTIES IS CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled. However heavy rain is still possible with this
thunderstorm.
LAT...LON 4257 7080 4253 7078 4255 7082 4254 7090
4254 7087 4251 7089 4252 7085 4250 7085
4249 7094 4250 7106 4262 7086
TIME...MOT...LOC 1727Z 240DEG 13KT 4249 7086
$$
ChaiThe office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 8:14 AM EDT | Flash Flood Warning | BOX | Hampden, Worcester | 3 hr |
| Aug 19, 9:18 AM EDT | Flash Flood Warning | BOX | Hampden, Hampshire, Worcester | 3 hr |
| Aug 19, 10:14 AM EDT | Severe Thunderstorm Warning | BOX | Middlesex, Worcester | 44 min |
| Aug 19, 10:21 AM EDT | Tornado Warning | BOX | Middlesex, Worcester | 29 min |
| Aug 19, 10:46 AM EDT | Flash Flood Warning | BOX | Essex, Middlesex, Norfolk, Suffolk, Worcester | 3 hr |
| Aug 19, 11:36 AM EDT | Severe Thunderstorm Warning | BOX | Essex, Middlesex, Norfolk, Suffolk, Worcester | 54 min |
| Aug 19, 11:40 AM EDT | Flash Flood Warning | BOX | Essex, Middlesex | 3 hr |
| Aug 19, 12:32 PM EDT | Severe Thunderstorm Warning | BOX | Essex, Middlesex, Norfolk, Suffolk | 58 min |
| Aug 19, 12:33 PM EDT | Special Marine Warning | BOX | 57 min | |
| Aug 19, 1:18 PM EDT | Tornado Warning | BOX | Middlesex, Worcester | 27 min |
| Aug 19, 1:37 PM EDT | Special Weather Statement | BOX | Essex | 38 min |
| Aug 19, 1:38 PM EDT | Special Marine Warning | BOX | 67 min | |
| Aug 19, 1:46 PM EDT | Special Weather Statement | BOX | Barnstable | 59 min |
| Aug 19, 1:48 PM EDT | Special Marine Warning | BOX | 57 min | |
| Aug 19, 1:54 PM EDT | Special Weather Statement | BOX | Middlesex | 51 min |
| Aug 19, 2:23 PM EDT | Severe Thunderstorm Warning | BOX | Middlesex | 37 min |
Nearby
Tornado Warnings in Massachusetts, 2021Every tornado warning in 2021Tornadoes 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.