Alert archive / Massachusetts / Tornado Warnings in 2018

Tornado Warning 3, NWS Boston/Norton, MA

June 18, 2018Franklin County, Hampshire County, Massachusetts

NWS Boston/Norton, MA issued this tornado warning at Jun 18, 2018, 5:34 PM EDT for Franklin County, Hampshire County, Massachusetts. It was in force for 26 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, 5:34 PM EDT (21:34 UTC)
Expired: Jun 18, 2018, 6:00 PM EDT
In force: 26 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Franklin County, MA, Hampshire County, MA

The radar

The Albany radar (KENX), 114 km from the middle of the area, began a volume at 21:34 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 18, 5:42 PM EDT	TSTM WND DMG	Conway, MA	TREE AND WIRES DOWN ON SHELBURNE FALLS ROAD
Jun 18, 5:46 PM EDT	TSTM WND DMG	Whately, MA	2 TREES ASND WIRES DOWN ON NORTH STREET

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, 9.6 hours before the alert went out and 97 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: 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.

091 
WFUS51 KBOX 182134
TORBOX
MAC011-015-182200-
/O.NEW.KBOX.TO.W.0003.180618T2134Z-180618T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Boston/Norton MA
534 PM EDT MON JUN 18 2018

The National Weather Service in Boston/Norton has issued a

* Tornado Warning for...
  Central Hampshire County in western Massachusetts...
  Central Franklin County in western Massachusetts...

* Until 600 PM EDT.
    
* At 534 PM EDT, a severe thunderstorm capable of producing a tornado
  was located near Conway, or 10 miles north of Northampton, moving
  east at 55 mph.

  HAZARD...Tornado.

  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#commaOrEllipsis()windows#commaOrEllipsis()and 
           vehicles will occur.  Tree damage is likely.

* This dangerous storm will be near...
  Whately around 540 PM EDT.
  Hadley, Sunderland and Hatfield around 545 PM EDT.
  Amherst and Leverett around 550 PM EDT.
  Shutesbury and Pelham around 555 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 4242 7286 4256 7282 4254 7242 4234 7247
TIME...MOT...LOC 2134Z 278DEG 49KT 4247 7275 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

KJC

2 follow-up statements

144 
WWUS51 KBOX 182137
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
537 PM EDT MON JUN 18 2018

MAC011-015-182200-
/O.CON.KBOX.TO.W.0003.000000T0000Z-180618T2200Z/
Hampshire MA-Franklin MA-
537 PM EDT MON JUN 18 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 600 PM EDT FOR CENTRAL
HAMPSHIRE AND CENTRAL FRANKLIN COUNTIES...
    
At 536 PM EDT, a severe thunderstorm capable of producing a tornado
was located over Stephentown, or 9 miles east of Nassau, and is
nearly stationary.

HAZARD...Tornado.

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 and vehicles will occur.  Tree damage is likely.

Locations impacted include...
Amherst, Deerfield, Montague, Hadley, Sunderland, Hatfield,
Williamsburg, Conway, Leverett, Shutesbury, Ashfield, Whately,
Pelham, Chesterfield, Goshen and Wendell.

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 4242 7286 4256 7282 4254 7242 4234 7247
TIME...MOT...LOC 2136Z 278DEG 49KT 4254 7342 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

JWD/KJC

027 
WWUS51 KBOX 182151
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
551 PM EDT MON JUN 18 2018

MAC011-015-182201-
/O.EXP.KBOX.TO.W.0003.000000T0000Z-180618T2200Z/
Hampshire MA-Franklin MA-
551 PM EDT MON JUN 18 2018

...THE TORNADO WARNING FOR CENTRAL HAMPSHIRE AND CENTRAL FRANKLIN
COUNTIES WILL EXPIRE AT 600 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.

LAT...LON 4242 7286 4256 7282 4254 7242 4234 7247
TIME...MOT...LOC 2151Z 278DEG 49KT 4252 7319 

$$

KJC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 18, 4:22 PM EDT	Special Weather Statement	BOX	Franklin	38 min
Jun 18, 4:38 PM EDT	Severe Thunderstorm Warning	BOX	Franklin	52 min
Jun 18, 4:49 PM EDT	Severe Thunderstorm Warning	BOX	Franklin	41 min
Jun 18, 5:10 PM EDT	Special Weather Statement	BOX	Worcester	35 min
Jun 18, 5:13 PM EDT	Special Weather Statement	BOX	Hampden	47 min
Jun 18, 5:23 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	52 min
Jun 18, 5:44 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Hampshire, Worcester	33 min
Jun 18, 5:49 PM EDT	Tornado Warning	BOX	Hampden, Hampshire, Worcester	26 min
Jun 18, 6:15 PM EDT	Special Marine Warning	BOX		60 min
Jun 18, 6:16 PM EDT	Special Weather Statement	BOX	Essex, Middlesex	44 min
Jun 18, 6:20 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire, Worcester	40 min
Jun 18, 6:26 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex, Suffolk, Worcester	49 min
Jun 18, 6:31 PM EDT	Special Marine Warning	BOX		59 min
Jun 18, 6:33 PM EDT	Tornado Warning	BOX	Franklin, Hampden, Hampshire, Worcester	24 min
Jun 18, 6:41 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex	50 min
Jun 18, 7:23 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Norfolk, Worcester	29 min
Jun 18, 7:59 PM EDT	Severe Thunderstorm Warning	BOX	Hampden	46 min

Nearby

Tornado Warnings in Massachusetts, 2018 Every tornado warning in 2018 Tornadoes 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.