Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 2, NWS Boston/Norton, MA

March 29, 2020Franklin County, Hampshire County, Worcester County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Mar 29, 2020, 8:47 PM EDT for Franklin County, Hampshire County, Worcester County, Massachusetts. It was in force for 36 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: Mar 29, 2020, 8:47 PM EDT (00:47 UTC)
Expired: Mar 29, 2020, 9:23 PM EDT
In force: 36 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Franklin County, MA, Hampshire County, MA, Worcester County, MA

The radar

The Albany radar (KENX), 107 km from the middle of the area, began a volume at 00:50 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

Albany, NY (KALY), launched 00:00Z, 0.8 hours before the alert went out and 88 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 684 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 431 m²/s²
0-3 km storm-relative helicity: 708 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

As transmitted.

745 
WUUS51 KBOX 300047
SVRBOX
MAC011-015-027-300145-
/O.NEW.KBOX.SV.W.0002.200330T0047Z-200330T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
847 PM EDT Sun Mar 29 2020

The National Weather Service in Boston/Norton has issued a

* Severe Thunderstorm Warning for...
  Northwestern Worcester County in central Massachusetts...
  Northwestern Hampshire County in western Massachusetts...
  Franklin County in western Massachusetts...

* Until 945 PM EDT.

* At 847 PM EDT, a severe thunderstorm was located over Hawley, or 13
  miles southeast of North Adams, moving east at 60 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Minor hail damage to vehicles is possible.

* Locations impacted include...
  Greenfield, Orange, Deerfield, Monroe, Athol, Montague, Sunderland,
  Northfield, Bernardston, Buckland, Conway, Shelburne, Leverett,
  Erving, Ashfield, Colrain, Gill, Charlemont, Royalston and Goshen.

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.

&&

LAT...LON 4272 7224 4254 7220 4246 7297 4250 7298
      4266 7295 4267 7300 4270 7295 4270 7302
      4274 7302
TIME...MOT...LOC 0047Z 253DEG 53KT 4258 7290 

HAIL...1.00IN
WIND...<50MPH
 
$$

Loconto

2 follow-up statements

438 
WWUS51 KBOX 300106
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
906 PM EDT Sun Mar 29 2020

MAC027-300115-
/O.CAN.KBOX.SV.W.0002.000000T0000Z-200330T0145Z/
Worcester MA-
906 PM EDT Sun Mar 29 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN WORCESTER COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved away 
from the warned area. Therefore, the warning has been cancelled.

LAT...LON 4272 7246 4252 7246 4246 7297 4251 7294
      4266 7291 4273 7291
TIME...MOT...LOC 0105Z 253DEG 53KT 4266 7254 

$$

MAC011-015-300145-
/O.CON.KBOX.SV.W.0002.000000T0000Z-200330T0145Z/
Hampshire MA-Franklin MA-
906 PM EDT Sun Mar 29 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM EDT
FOR NORTHWESTERN HAMPSHIRE AND NORTHWESTERN FRANKLIN COUNTIES...

At 905 PM EDT, a severe thunderstorm was located over Bernardston, or
near Greenfield, moving east at 60 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Minor hail damage to vehicles is possible.

Locations impacted include...
Greenfield, Deerfield, Montague, Northfield, Bernardston, Buckland,
Conway, Shelburne, Erving, Ashfield, Colrain, Gill, Charlemont,
Goshen, Cummington, Leyden, Heath, Plainfield, Rowe and Hawley.

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.

&&

LAT...LON 4272 7246 4252 7246 4246 7297 4251 7294
      4266 7291 4273 7291
TIME...MOT...LOC 0105Z 253DEG 53KT 4266 7254 

HAIL...1.00IN
WIND...<50MPH
 
$$

Loconto

109 
WWUS51 KBOX 300123 RRA
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
923 PM EDT Sun Mar 29 2020

MAC011-015-300133-
/O.CAN.KBOX.SV.W.0002.000000T0000Z-200330T0145Z/
Hampshire MA-Franklin MA-
923 PM EDT Sun Mar 29 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN HAMPSHIRE AND
NORTHWESTERN FRANKLIN COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.  However small hail is
still possible with this thunderstorm.

LAT...LON 4272 7246 4252 7246 4246 7297 4251 7294
      4266 7291 4273 7291
TIME...MOT...LOC 0118Z 253DEG 53KT 4274 7219 

$$

Loconto

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 29, 8:12 PM EDT	Special Weather Statement	BOX	Middlesex	48 min
Mar 29, 8:23 PM EDT	Special Weather Statement	BOX	Essex, Middlesex	52 min
Mar 29, 8:34 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	26 min
Mar 29, 8:38 PM EDT	Special Weather Statement	BOX	Franklin	37 min
Mar 29, 8:39 PM EDT	Special Weather Statement	BOX	Bristol	51 min
Mar 29, 8:41 PM EDT	Special Marine Warning	BOX		34 min
Mar 29, 8:52 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Norfolk, Worcester	38 min
Mar 29, 8:55 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Norfolk, Worcester	30 min
Mar 29, 9:02 PM EDT	Special Weather Statement	BOX	Bristol, Plymouth	43 min
Mar 29, 9:14 PM EDT	Special Marine Warning	BOX		31 min
Mar 29, 9:24 PM EDT	Special Weather Statement	BOX	Plymouth	36 min
Mar 29, 9:27 PM EDT	Special Weather Statement	BOX	Norfolk	48 min
Mar 29, 9:38 PM EDT	Special Marine Warning	BOX		37 min
Mar 29, 9:44 PM EDT	Special Weather Statement	BOX	Bristol	31 min
Mar 29, 9:45 PM EDT	Special Marine Warning	BOX		60 min
Mar 29, 9:45 PM EDT	Special Weather Statement	BOX	Worcester	45 min
Mar 29, 9:47 PM EDT	Special Marine Warning	BOX		43 min
Mar 29, 9:52 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Plymouth	38 min
Mar 29, 9:53 PM EDT	Special Weather Statement	BOX	Suffolk	37 min
Mar 29, 10:13 PM EDT	Severe Thunderstorm Warning	BOX	Barnstable, Bristol, Plymouth	19 min
Mar 29, 10:16 PM EDT	Special Marine Warning	BOX		44 min
Mar 29, 10:48 PM EDT	Special Marine Warning	BOX		42 min
Mar 29, 10:54 PM EDT	Special Weather Statement	BOX	Barnstable	36 min
Mar 30, 3:59 AM EDT	Small Craft Advisory	BOX		31 hr
Mar 30, 3:55 PM EDT	Small Craft Advisory	BOX		19 hr

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2020 Every severe thunderstorm warning in 2020

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.