Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 13, NWS Boston/Norton, MA

June 18, 2018Franklin County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jun 18, 2018, 4:49 PM EDT for Franklin County, Massachusetts. It was in force for 41 min. 2 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 18, 2018, 4:49 PM EDT (20:49 UTC)
Expired
Jun 18, 2018, 5:30 PM EDT
In force
41 min
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Franklin County, MA

The radar

The Albany radar (KENX), 106 km from the middle of the area, began a volume at 20:49 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

TimeReportWhereRemark
Jun 18, 5:19 PM EDTHAIL 1Ashfield, MANICKEL TO QUARTER SIZED HAIL ON HAWLEY ROAD
Jun 18, 5:31 PM EDTTSTM WND DMGAshfield, MAWIRES AND TRANSFORMER DOWN ON CONWAY ROAD

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

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 8.8 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-pSkew-T log-p diagram, Albany, NY at 12:00Z on 2018-06-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Albany, NY at 12:00Z on 2018-06-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 167 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1 J/kg
Mixed-layer CIN
-297 J/kg
Mixed-layer LCL
1389 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
167 m²/s²
0-3 km storm-relative helicity
159 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

558 
WUUS51 KBOX 182049
SVRBOX
MAC011-182130-
/O.NEW.KBOX.SV.W.0013.180618T2049Z-180618T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
449 PM EDT MON JUN 18 2018

The National Weather Service in Boston/Norton has issued a

* Severe Thunderstorm Warning for...
  Central Franklin County in western Massachusetts...

* Until 530 PM EDT.

* At 448 PM EDT, a severe thunderstorm was located near Savoy, or
  near North Adams, moving east at 40 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is possible. Expect damage to 
           trees and power lines.

* Locations impacted include...
  Amherst, Greenfield, Deerfield, Montague, Sunderland, Buckland,
  Conway, Shelburne, Leverett, Erving, Ashfield, Colrain, Gill,
  Whately, Charlemont, Goshen, Wendell, Heath, Plainfield and Rowe.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4267 7299 4260 7241 4243 7249 4242 7260
      4244 7270 4245 7270 4245 7277 4246 7276
      4248 7287 4254 7288 4256 7297 4266 7295
TIME...MOT...LOC 2048Z 280DEG 37KT 4261 7305 

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

KJC

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 18, 4:22 PM EDTSpecial Weather StatementBOXFranklin38 min
Jun 18, 4:38 PM EDTSevere Thunderstorm WarningBOXFranklin52 min
Jun 18, 5:10 PM EDTSpecial Weather StatementBOXWorcester35 min
Jun 18, 5:13 PM EDTSpecial Weather StatementBOXHampden47 min
Jun 18, 5:23 PM EDTSevere Thunderstorm WarningBOXMiddlesex, Worcester52 min
Jun 18, 5:34 PM EDTTornado WarningBOXFranklin, Hampshire26 min
Jun 18, 5:44 PM EDTSevere Thunderstorm WarningBOXHampden, Hampshire, Worcester33 min
Jun 18, 5:49 PM EDTTornado WarningBOXHampden, Hampshire, Worcester26 min
Jun 18, 6:15 PM EDTSpecial Marine WarningBOX60 min
Jun 18, 6:16 PM EDTSpecial Weather StatementBOXEssex, Middlesex44 min
Jun 18, 6:20 PM EDTSevere Thunderstorm WarningBOXFranklin, Hampden, Hampshire, Worcester40 min
Jun 18, 6:26 PM EDTSevere Thunderstorm WarningBOXEssex, Middlesex, Suffolk, Worcester49 min
Jun 18, 6:31 PM EDTSpecial Marine WarningBOX59 min
Jun 18, 6:33 PM EDTTornado WarningBOXFranklin, Hampden, Hampshire, Worcester24 min
Jun 18, 6:41 PM EDTSevere Thunderstorm WarningBOXEssex, Middlesex50 min
Jun 18, 7:23 PM EDTSevere Thunderstorm WarningBOXHampden, Norfolk, Worcester29 min
Jun 18, 7:59 PM EDTSevere Thunderstorm WarningBOXHampden46 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2018Every 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.