Alert archive / Massachusetts / Tornado Warnings in 2021

Tornado Warning 1, NWS Boston/Norton, MA

June 30, 2021Franklin County, Worcester County, Massachusetts

NWS Boston/Norton, MA issued this tornado warning at Jun 30, 2021, 4:45 PM EDT for Franklin County, Worcester County, Massachusetts. It was in force for 26 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: Jun 30, 2021, 4:45 PM EDT (20:45 UTC)
Expired: Jun 30, 2021, 5:11 PM EDT
In force: 26 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Franklin County, MA, Worcester County, MA

The radar

The Boston radar (KBOX), 107 km from the middle of the area, began a volume at 20:46 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 30, 4:55 PM EDT	TSTM WND DMG	Warwick, MA	TREE DOWN BLOCKING ORANGE ROAD
Jun 30, 5:00 PM EDT	TSTM WND DMG	Athol, MA	TREE DOWN ON HOUSE ON JERI DRIVE. TREE DOWN ON METROPLOLITAN COURT
Jun 30, 5:00 PM EDT	TSTM WND DMG	Orange, MA	TREE BRANCH DOWN ON WIRES ON WARWICK RD
Jun 30, 5:15 PM EDT	TSTM WND DMG	Athol, MA	TRANSFORMER BLOWN, WIRES ACROSS ROAD ON PEQUOIG AVE

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 30, 3:21 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 8.8 hours before the alert went out and 147 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 113 J/kg
Mixed-layer CIN: -257 J/kg
Mixed-layer LCL: 1162 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 98 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

063 
WFUS51 KBOX 302045
TORBOX
MAC011-027-302130-
/O.NEW.KBOX.TO.W.0001.210630T2045Z-210630T2130Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Boston/Norton MA
445 PM EDT Wed Jun 30 2021

The National Weather Service in Boston/Norton has issued a

* Tornado Warning for...
  Northwestern Worcester County in central Massachusetts...
  Northeastern Franklin County in western Massachusetts...

* Until 530 PM EDT.
    
* At 444 PM EDT, a severe thunderstorm capable of producing a tornado
  was located near Orange, moving east at 35 mph.

  HAZARD...Tornado and quarter size hail.

  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...
  Phillipston around 450 PM EDT.
  Templeton around 455 PM EDT.
  Gardner and Winchendon around 500 PM EDT.
  Westminster and Ashburnham around 510 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 4271 7190 4269 7188 4253 7182 4255 7232
      4272 7237
TIME...MOT...LOC 2044Z 260DEG 40KT 4264 7225 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Frank

4 follow-up statements

045 
WWUS51 KBOX 302048
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
448 PM EDT Wed Jun 30 2021

MAC011-027-302130-
/O.CON.KBOX.TO.W.0001.000000T0000Z-210630T2130Z/
Worcester MA-Franklin MA-
448 PM EDT Wed Jun 30 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM EDT FOR
NORTHWESTERN WORCESTER AND NORTHEASTERN FRANKLIN COUNTIES...
    
At 447 PM EDT, a severe thunderstorm capable of producing a tornado
was located near Royalston, moving east at 25 mph.

HAZARD...Tornado and quarter size hail.

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...
  Templeton around 505 PM EDT.
  Winchendon around 510 PM EDT.
  Gardner around 515 PM EDT.
  Westminster and Ashburnham around 530 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.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4271 7190 4269 7188 4258 7185 4257 7226
      4272 7230
TIME...MOT...LOC 2047Z 260DEG 20KT 4265 7220 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Frank

257 
WWUS51 KBOX 302056
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
456 PM EDT Wed Jun 30 2021

MAC011-302105-
/O.CAN.KBOX.TO.W.0001.000000T0000Z-210630T2130Z/
Franklin MA-
456 PM EDT Wed Jun 30 2021

...THE TORNADO WARNING FOR NORTHEASTERN FRANKLIN COUNTY IS
CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
central and northeastern Massachusetts.

LAT...LON 4271 7190 4269 7188 4258 7185 4257 7217
      4272 7220
TIME...MOT...LOC 2055Z 259DEG 20KT 4267 7207 

$$

MAC027-302130-
/O.CON.KBOX.TO.W.0001.000000T0000Z-210630T2130Z/
Worcester MA-
456 PM EDT Wed Jun 30 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM EDT FOR
NORTHWESTERN WORCESTER COUNTY...
    
At 455 PM EDT, a severe thunderstorm capable of producing a tornado
was located over Winchendon, or 11 miles south of Jaffrey, moving
east at 25 mph.

HAZARD...Tornado and quarter size hail.

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...
  Gardner around 510 PM EDT.
  Ashburnham around 520 PM EDT.
  Westminster around 525 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.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4271 7190 4269 7188 4258 7185 4257 7217
      4272 7220
TIME...MOT...LOC 2055Z 259DEG 20KT 4267 7207 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Frank

108 
WWUS51 KBOX 302102
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
502 PM EDT Wed Jun 30 2021

MAC027-302130-
/O.CON.KBOX.TO.W.0001.000000T0000Z-210630T2130Z/
Worcester MA-
502 PM EDT Wed Jun 30 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM EDT FOR NORTH
CENTRAL WORCESTER COUNTY...
    
At 501 PM EDT, a severe thunderstorm capable of producing a tornado
was located near Ashburnham, or 9 miles northwest of Fitchburg,
moving east at 25 mph.

HAZARD...Tornado and quarter size hail.

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...
  Westminster and Ashburnham around 515 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.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4271 7190 4269 7188 4258 7185 4257 7206
      4272 7211
TIME...MOT...LOC 2101Z 256DEG 19KT 4266 7198 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Frank

057 
WWUS51 KBOX 302111
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
511 PM EDT Wed Jun 30 2021

MAC027-302119-
/O.CAN.KBOX.TO.W.0001.000000T0000Z-210630T2130Z/
Worcester MA-
511 PM EDT Wed Jun 30 2021

...THE TORNADO WARNING FOR NORTH CENTRAL WORCESTER COUNTY IS
CANCELLED...
                
The storm which prompted the warning appears to be more of a 
damaging straight line wind threat as opposed to a tornado. 
Therefore, the tornado warning has been cancelled. However, a severe 
thunderstorm warning for damaging wind gusts remains in effect.

LAT...LON 4271 7190 4269 7188 4258 7185 4257 7206
      4272 7211
TIME...MOT...LOC 2108Z 260DEG 40KT 4268 7185 

$$

Frank

The office that day

Everything else NWS Boston/Norton, MA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 30, 2:29 AM EDT	Small Craft Advisory	BOX		18 hr
Jun 30, 3:40 PM EDT	Special Weather Statement	BOX	Hampshire	65 min
Jun 30, 3:42 PM EDT	Special Weather Statement	BOX	Franklin	63 min
Jun 30, 3:48 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire	57 min
Jun 30, 4:03 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire	57 min
Jun 30, 4:32 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Middlesex, Worcester	58 min
Jun 30, 4:39 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire, Worcester	66 min
Jun 30, 5:00 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	30 min
Jun 30, 5:13 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	62 min
Jun 30, 5:25 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex	49 min
Jun 30, 5:26 PM EDT	Special Marine Warning	BOX		64 min
Jun 30, 5:29 PM EDT	Severe Thunderstorm Warning	BOX	Worcester	44 min
Jun 30, 5:43 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex	51 min
Jun 30, 5:54 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Norfolk, Suffolk, Worcester	53 min
Jun 30, 5:58 PM EDT	Special Marine Warning	BOX		62 min
Jun 30, 6:11 PM EDT	Special Weather Statement	BOX	Norfolk	49 min
Jun 30, 6:12 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Norfolk, Plymouth, Suffolk, Worcester	47 min
Jun 30, 6:22 PM EDT	Special Marine Warning	BOX		53 min
Jun 30, 6:31 PM EDT	Special Marine Warning	BOX		59 min
Jun 30, 6:45 PM EDT	Severe Thunderstorm Warning	BOX	Hampden	60 min
Jun 30, 6:57 PM EDT	Special Marine Warning	BOX		33 min
Jun 30, 7:15 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Worcester	60 min

Nearby

Tornado Warnings in Massachusetts, 2021 Every tornado warning in 2021 Tornadoes 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.