Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 1, NWS Boston/Norton, MA

February 25, 2017Franklin County, Hampshire County, Worcester County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Feb 25, 2017, 7:18 PM EST for Franklin County, Hampshire County, Worcester County, Massachusetts. It was in force for 42 min. 15 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: Feb 25, 2017, 7:18 PM EST (00:18 UTC)
Expired: Feb 25, 2017, 8:00 PM EST
In force: 42 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Boston radar (KBOX), 126 km from the middle of the area, began a volume at 00:20 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
Feb 25, 7:18 PM EST	TORNADO	Goshen, MA	AN EF-1 TORNADO TOCHED DOWN BRIEFLY IN GOSHEN. SEVERAL PINE TREES WERE SNAPPED MID-WAY AND TWO HOMES WERE DAMAGED BY TREES FALLING ONTO THEM ON PINE ROAD...JUST TO THE EAST OF HAMMOND POND.
Feb 25, 7:20 PM EST	TORNADO	Conway, MA	* 1 INJ * AN EF-1 TORNADO TOUCHDOWN IN CONWAY WITH A PATH LENGTH OF 5 MILES. 12-14 HOMES WERE SEVERELY DAMAGED AND HUNDREDS OF TREES WERE KNOCKED DOWN.
Feb 25, 7:30 PM EST	TSTM WND DMG	Conway, MA	* 1 INJ * TREE ON A HOUSE ON SOUTH DEERFIELD RD. OTHER TREES DOWN NEAR TOWN HALL. TREE THROUGH WINDSHIELD OF A CAR.
Feb 25, 7:31 PM EST	TSTM WND DMG	Conway, MA	MULTIPLE TREES AND WIRES DOWN BLOCKING GRAVES ROAD
Feb 25, 7:31 PM EST	TSTM WND DMG	Conway, MA	SEVERAL TREES DOWN ON HOOSIC ROAD AND MAIN POLAND ROAD
Feb 25, 7:35 PM EST	TSTM WND DMG	Montague, MA	TREE DOWN ON WIRES ON SWAMP RD
Feb 25, 7:35 PM EST	TSTM WND DMG	Montague, MA	TREES DOWN ON NORTH LEVERETT ROAD
Feb 25, 7:36 PM EST	TSTM WND DMG	Conway, MA	TREE BLOCKING SHELBURNE FALLS RD BY CEMETERY HILL RD.
Feb 25, 7:39 PM EST	TSTM WND DMG	Conway, MA	MULTIPLE TREES AND WIRES DOWN ON SHELBURNE FALLS RD.
Feb 25, 7:40 PM EST	TSTM WND DMG	Conway, MA	MULTIPLE TREES DOWN ON BARTELS FERRY ROAD.
Feb 25, 7:40 PM EST	TSTM WND DMG	Deerfield, MA	DOWNED TREE BLOCKING RIVER RD IN SOUTHERN PART OF TOWN.
Feb 25, 7:40 PM EST	TSTM WND DMG	Deerfield, MA	TREE AND WIRES DOWN ACROSS OLD MAIN RD. TREE AND WIRES DOWN ACROSS UPPER RD.
Feb 25, 7:45 PM EST	TSTM WND DMG	Sunderland, MA	TREE DOWN ON SOUTH MAIN ST
Feb 25, 7:50 PM EST	TSTM WND DMG	Warwick, MA	TREE AND WIRES DOWN ON ROBBINS RD NEAR RTE 78
Feb 25, 7:50 PM EST	TSTM WND DMG	Whately, MA	TREE DOWN IN LEFT LANE OF I-91 NORTHBOUND

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

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 0.3 hours before the alert went out and 186 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: 9 J/kg
Mixed-layer CIN: -191 J/kg
Mixed-layer LCL: 462 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 227 m²/s²
0-3 km storm-relative helicity: 266 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

091 
WUUS51 KBOX 260018
SVRBOX
MAC011-015-027-260100-
/O.NEW.KBOX.SV.W.0001.170226T0018Z-170226T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Taunton MA
718 PM EST SAT FEB 25 2017

The National Weather Service in Taunton has issued a

* Severe Thunderstorm Warning for...
  Northwestern Worcester County in central Massachusetts...
  Central Hampshire County in western Massachusetts...
  Northeastern Franklin County in western Massachusetts...

* Until 800 PM EST

* At 718 PM EST, a severe thunderstorm was located over Chesterfield,
  or near Northampton, moving northeast at 55 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to roofs, siding, and trees. 

* Locations impacted include...
  Amherst, Northampton, Orange, Deerfield, Gardner, Easthampton,
  Athol, Winchendon, Montague, Templeton, Westminster, Ashburnham,
  Southampton, Hadley, Sunderland, Hatfield, Northfield,
  Williamsburg, Huntington and Conway.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4240 7294 4272 7226 4271 7199 4258 7189
      4225 7281
TIME...MOT...LOC 0018Z 240DEG 47KT 4237 7279 

HAIL...<.75IN
WIND...60MPH
 
$$

Belk

1 follow-up statement

718 
WWUS51 KBOX 260053
SVSBOX

Severe Weather Statement
National Weather Service Taunton MA
753 PM EST SAT FEB 25 2017

MAC011-015-027-260102-
/O.EXP.KBOX.SV.W.0001.000000T0000Z-170226T0100Z/
Worcester MA-Hampshire MA-Franklin MA-
753 PM EST SAT FEB 25 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN WORCESTER...
CENTRAL HAMPSHIRE AND NORTHEASTERN FRANKLIN COUNTIES WILL EXPIRE AT
800 PM EST...
                
The storm which prompted the warning has weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore the warning will be allowed to expire.  However gusty winds
are still possible with this thunderstorm.

LAT...LON 4240 7294 4272 7226 4271 7199 4258 7189
      4225 7281
TIME...MOT...LOC 0052Z 240DEG 47KT 4258 7229 

$$

Belk

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 25, 7:40 PM EST	Special Weather Statement	BOX	Franklin	35 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2017 Every severe thunderstorm warning in 2017

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.