Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 4, NWS Boston/Norton, MA

May 15, 2018Hampden County, Hampshire County, Massachusetts; Capitol Planning Region, Connecticut

NWS Boston/Norton, MA issued this severe thunderstorm warning at May 15, 2018, 3:06 PM EDT for Hampden County, Hampshire County, Massachusetts; Capitol Planning Region, Connecticut. It was in force for 54 min. 6 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, 2018, 3:06 PM EDT (19:06 UTC)
Expired: May 15, 2018, 4:00 PM EDT
In force: 54 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Tornado: Possible
Hail: 2.0 in
Wind: 60.0 mph

Counties Capitol Planning Region, CT, Hampden County, MA, Hampshire County, MA

The radar

The Albany radar (KENX), 112 km from the middle of the area, began a volume at 19:05 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
May 15, 4:00 PM EDT	HAIL 1	East Hartland, CT
May 15, 4:00 PM EDT	HAIL 1.75	Hartland, CT
May 15, 4:05 PM EDT	HAIL 0.88	Granville, MA	TRAINED SPOTTER
May 15, 4:06 PM EDT	HAIL 2	East Hartland, CT
May 15, 4:10 PM EDT	HAIL 0.88	Granville, MA
May 15, 4:10 PM EDT	HAIL 1.5	Southwick, MA	TRAINED SPOTTER

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, 2:23 PM EDT	Tornado Watch	SPC	4 hr

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 7.1 hours before the alert went out and 106 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: 932 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 103 m²/s²
0-3 km storm-relative helicity: 259 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

990 
WUUS51 KBOX 151906
SVRBOX
CTC003-MAC013-015-152000-
/O.NEW.KBOX.SV.W.0004.180515T1906Z-180515T2000Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
306 PM EDT TUE MAY 15 2018

The National Weather Service in Boston/Norton has issued a

* Severe Thunderstorm Warning for...
  Northwestern Hartford County in northern Connecticut...
  Southwestern Hampshire County in western Massachusetts...
  Southwestern Hampden County in western Massachusetts...

* Until 400 PM EDT.

* At 305 PM EDT, a severe thunderstorm was located near Copake, or 12
  miles southwest of Great Barrington, moving east at 40 mph.

  HAZARD...Up to two inch hail and 60 mph wind gusts.

  SOURCE...Trained weather spotters.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           damage to trees and power lines.

* Locations impacted include...
  Hartford, New Britain, West Hartford, Westfield, Holyoke,
  Newington, Windsor, Agawam, West Springfield, Farmington, Simsbury,
  Bloomfield, Avon, Easthampton, Suffield, Windsor Locks, Granby,
  Canton, Southwick and Burlington.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a dangerous storm. Prepare immediately for large destructive
hail capable of producing significant damage. People outside should
move to shelter inside a strong building,  and stay away from
windows.

&&

A Tornado Watch remains in effect until 900 PM EDT for northern
Connecticut...and western Massachusetts.

LAT...LON 4215 7307 4215 7303 4226 7300 4229 7265
      4169 7272 4178 7302 4180 7301 4181 7295
      4188 7295 4190 7291 4197 7289 4197 7303
      4204 7301 4204 7306
TIME...MOT...LOC 1905Z 272DEG 33KT 4206 7350 

TORNADO...POSSIBLE
HAIL...2.00IN
WIND...60MPH
 
$$

Sipprell

The office that day

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

Issued	Product	Office	Counties	Lasted
May 15, 11:08 AM EDT	Special Weather Statement	BOX	Franklin, Hampshire	37 min
May 15, 3:13 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire	47 min
May 15, 3:33 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire, Worcester	42 min
May 15, 3:46 PM EDT	Severe Thunderstorm Warning	BOX	Hampden	59 min
May 15, 4:31 PM EDT	Special Weather Statement	BOX	Middlesex	44 min
May 15, 4:59 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Suffolk, Worcester	31 min
May 15, 5:03 PM EDT	Special Marine Warning	BOX		57 min
May 15, 5:27 PM EDT	Special Weather Statement	BOX	Norfolk	48 min
May 15, 5:37 PM EDT	Special Marine Warning	BOX		83 min
May 15, 6:14 PM EDT	Special Weather Statement	BOX	Bristol, Dukes, Plymouth	61 min
May 15, 6:21 PM EDT	Special Marine Warning	BOX		70 min
May 15, 6:56 PM EDT	Special Marine Warning	BOX		34 min
May 15, 3:36 PM EDT	Tornado Warning	BOX	Capitol Planning Region	24 min
May 15, 4:02 PM EDT	Tornado Warning	BOX	Capitol Planning Region	28 min
May 15, 4:42 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	63 min
May 15, 5:31 PM EDT	Special Weather Statement	BOX		59 min
May 15, 5:48 PM EDT	Severe Thunderstorm Warning	BOX	Northeastern Connecticut Planning Region	27 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2018 Severe Thunderstorm Warnings in Connecticut, 2018 Every severe thunderstorm warning in 2018

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.