Alert archive / Massachusetts / Tornado Warnings in 2018

Tornado Warning 5, NWS Boston/Norton, MA

June 18, 20184 counties in Massachusetts

NWS Boston/Norton, MA issued this tornado warning at Jun 18, 2018, 6:33 PM EDT for 4 counties in Massachusetts. It was in force for 24 min. 1 report 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, 6:33 PM EDT (22:33 UTC)
Expired: Jun 18, 2018, 6:57 PM EDT
In force: 24 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

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

The radar

The Boston radar (KBOX), 116 km from the middle of the area, began a volume at 22:37 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, 6:42 PM EDT	FUNNEL CLOUD	Granby, MA	CONFIRMED ROTATION ALOFT VIA MULTIPLE VIDEOS

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, 10.6 hours before the alert went out and 121 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.

879 
WFUS51 KBOX 182233
TORBOX
MAC011-013-015-027-182315-
/O.NEW.KBOX.TO.W.0005.180618T2233Z-180618T2315Z/

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

The National Weather Service in Boston/Norton has issued a

* Tornado Warning for...
  Western Worcester County in central Massachusetts...
  Southeastern Hampshire County in western Massachusetts...
  Southeastern Franklin County in western Massachusetts...
  East central Hampden County in western Massachusetts...

* Until 715 PM EDT.
    
* At 633 PM EDT, a severe thunderstorm capable of producing a tornado
  was located over Hadley, or near Northampton, moving east at 15
  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...
  Hadley around 640 PM EDT.
  South Hadley around 650 PM EDT.
  Amherst around 655 PM EDT.
  Granby around 705 PM EDT.
  Belchertown and Pelham around 715 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 4227 7259 4238 7257 4236 7225 4218 7231
TIME...MOT...LOC 2233Z 283DEG 12KT 4233 7261 

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

$$

KJC

2 follow-up statements

514 
WWUS51 KBOX 182249
SVSBOX

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

MAC011-027-182258-
/O.CAN.KBOX.TO.W.0005.000000T0000Z-180618T2315Z/
Worcester MA-Franklin MA-
649 PM EDT MON JUN 18 2018

...THE TORNADO WARNING FOR WESTERN WORCESTER AND SOUTHEASTERN
FRANKLIN COUNTIES IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

LAT...LON 4223 7246 4228 7244 4227 7228 4218 7231
TIME...MOT...LOC 2248Z 283DEG 12KT 4232 7254 

$$

MAC013-015-182315-
/O.CON.KBOX.TO.W.0005.000000T0000Z-180618T2315Z/
Hampshire MA-Hampden MA-
649 PM EDT MON JUN 18 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM EDT FOR
SOUTHEASTERN HAMPSHIRE AND EAST CENTRAL HAMPDEN COUNTIES...
    
At 648 PM EDT, a severe thunderstorm capable of producing a tornado
was located near Hadley, or near Amherst, moving east at 15 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, windows and vehicles will occur. Tree damage is 
         likely.

This dangerous storm will be near...
  Granby around 705 PM EDT.
  Belchertown and Ware around 715 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 4223 7246 4228 7244 4227 7228 4218 7231
TIME...MOT...LOC 2248Z 283DEG 12KT 4232 7254 

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

$$

KJC

382 
WWUS51 KBOX 182257
SVSBOX

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

MAC013-015-182307-
/O.CAN.KBOX.TO.W.0005.000000T0000Z-180618T2315Z/
Hampshire MA-Hampden MA-
657 PM EDT MON JUN 18 2018

...THE TORNADO WARNING FOR SOUTHEASTERN HAMPSHIRE AND EAST CENTRAL
HAMPDEN COUNTIES IS CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.

LAT...LON 4223 7246 4228 7244 4227 7228 4218 7231
TIME...MOT...LOC 2254Z 283DEG 12KT 4231 7250 

$$

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, 5:34 PM EDT	Tornado Warning	BOX	Franklin, Hampshire	26 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, 6:41 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.