Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 13, NWS Boston/Norton, MA

May 15, 20204 counties in Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at May 15, 2020, 8:06 PM EDT for 4 counties in Massachusetts. It was in force for 54 min. 3 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: May 15, 2020, 8:06 PM EDT (00:06 UTC)
Expired: May 15, 2020, 9:00 PM EDT
In force: 54 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

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

What was reported inside it

Time	Report	Where	Remark
May 15, 8:33 PM EDT	TSTM WND DMG	Holyoke, MA	HOUSES WITH PARTIALLY COLLAPSED ROOF AND DOWNED POWER LINES ON WEST ST
May 15, 8:41 PM EDT	TSTM WND GST 63	Worcester Ap, MA
May 15, 8:41 PM EDT	NON-TSTM WND GST 63	Worcester Ap, MA

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
May 15, 3:32 PM EDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Albany, NY (KALY), launched 00:00Z, 0.1 hours before the alert went out and 129 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: 1029 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: -7 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

904 
WUUS51 KBOX 160006
SVRBOX
MAC011-013-015-027-160100-
/O.NEW.KBOX.SV.W.0013.200516T0006Z-200516T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
806 PM EDT Fri May 15 2020

The National Weather Service in Boston/Norton has issued a

* Severe Thunderstorm Warning for...
  Southwestern Worcester County in central Massachusetts...
  Southeastern Hampshire County in western Massachusetts...
  Southeastern Franklin County in western Massachusetts...
  Hampden County in western Massachusetts...

* Until 900 PM EDT.

* At 805 PM EDT, a severe thunderstorm was located over Granby, or
  near Chicopee, moving east at 45 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...
  Worcester, Springfield, Chicopee, Westfield, Holyoke, Amherst,
  Northampton, Agawam, West Springfield, Ludlow, South Hadley,
  Holden, Southbridge, Auburn, Easthampton, Longmeadow, East
  Longmeadow, Belchertown, Wilbraham and Oxford.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1000 PM EDT for western and
central Massachusetts.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4204 7288 4239 7261 4234 7185 4204 7190
TIME...MOT...LOC 0005Z 282DEG 41KT 4224 7254 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$

Frank

2 follow-up statements

100 
WWUS51 KBOX 160036
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
836 PM EDT Fri May 15 2020

MAC011-160045-
/O.CAN.KBOX.SV.W.0013.000000T0000Z-200516T0100Z/
Franklin MA-
836 PM EDT Fri May 15 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN FRANKLIN COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 1000 PM EDT for western and
central Massachusetts.

LAT...LON 4204 7263 4237 7224 4234 7185 4204 7190
TIME...MOT...LOC 0035Z 282DEG 41KT 4217 7208 

$$

MAC013-015-027-160100-
/O.CON.KBOX.SV.W.0013.000000T0000Z-200516T0100Z/
Worcester MA-Hampshire MA-Hampden MA-
836 PM EDT Fri May 15 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR SOUTHWESTERN WORCESTER...SOUTHEASTERN HAMPSHIRE AND SOUTHEASTERN
HAMPDEN COUNTIES...

At 835 PM EDT, a severe thunderstorm was located over Brookfield, or
15 miles southwest of Worcester, moving east at 45 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated. Trees and powerlines have been reported 
         downed in Agawam and Belchertown from these storms.

IMPACT...Expect wind damage to trees and power lines. Minor hail 
         damage to vehicles is possible.

Locations impacted include...
Worcester, Springfield, Agawam, Ludlow, Holden, Southbridge, Auburn,
Longmeadow, East Longmeadow, Belchertown, Wilbraham, Oxford,
Charlton, Palmer, Spencer, Dudley, Leicester, Ware, Sturbridge and
Monson.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1000 PM EDT for western and
central Massachusetts.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4204 7263 4237 7224 4234 7185 4204 7190
TIME...MOT...LOC 0035Z 282DEG 41KT 4217 7208 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$

Loconto

807 
WWUS51 KBOX 160056
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
856 PM EDT Fri May 15 2020

MAC013-015-027-160104-
/O.EXP.KBOX.SV.W.0013.000000T0000Z-200516T0100Z/
Worcester MA-Hampshire MA-Hampden MA-
856 PM EDT Fri May 15 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN WORCESTER...
SOUTHEASTERN HAMPSHIRE AND SOUTHEASTERN HAMPDEN COUNTIES WILL EXPIRE
AT 900 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

A Tornado Watch remains in effect until 1000 PM EDT for western and
central Massachusetts.

Remember, a Severe Thunderstorm Warning still remains in effect for
southern Worcester County until 915 PM.

LAT...LON 4204 7263 4237 7224 4234 7185 4204 7190
TIME...MOT...LOC 0054Z 282DEG 41KT 4213 7185 

$$

Loconto

The office that day

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

Issued	Product	Office	Counties	Lasted
May 15, 8:08 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex, Norfolk, Worcester	52 min
May 15, 8:15 PM EDT	Severe Thunderstorm Warning	BOX	Hampden	60 min
May 15, 8:34 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Hampshire, Middlesex, Norfolk, Worcester	41 min
May 15, 8:48 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex, Suffolk	35 min
May 15, 8:55 PM EDT	Special Marine Warning	BOX		35 min
May 15, 8:59 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Essex, Middlesex, Norfolk, Plymouth, Suffolk and 1 more	61 min
May 15, 9:17 PM EDT	Special Marine Warning	BOX		28 min

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.