Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 73, NWS Boston/Norton, MA

September 5, 2017Franklin County, Worcester County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Sep 5, 2017, 5:42 PM EDT for Franklin County, Worcester County, Massachusetts. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 5, 2017, 5:42 PM EDT (21:42 UTC)
Expired: Sep 5, 2017, 6:30 PM EDT
In force: 48 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Franklin County, MA, Worcester County, MA

The radar

The Albany radar (KENX), 133 km from the middle of the area, began a volume at 21:44 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.

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 9.7 hours before the alert went out and 113 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: 44 J/kg
Mixed-layer CIN: -330 J/kg
Mixed-layer LCL: 962 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 129 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted.

326 
WUUS51 KBOX 052142
SVRBOX
MAC011-027-052230-
/O.NEW.KBOX.SV.W.0073.170905T2142Z-170905T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Taunton MA
542 PM EDT TUE SEP 5 2017

The National Weather Service in Taunton has issued a

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

* Until 630 PM EDT

* At 541 PM EDT, a severe thunderstorm was located over Gill, or near
  Greenfield, moving northeast at 35 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...
  Greenfield, Orange, Deerfield, Montague, Winchester, Northfield,
  Bernardston, Shelburne, Erving, Colrain, Gill, Royalston, Richmond,
  Wendell, Warwick, Leyden and South Vernon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4273 7251 4272 7216 4271 7215 4253 7257
      4261 7270 4273 7252
TIME...MOT...LOC 2141Z 234DEG 30KT 4265 7253 

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

DUNTEN

2 follow-up statements

012 
WWUS51 KBOX 052158
SVSBOX

Severe Weather Statement
National Weather Service Taunton MA
558 PM EDT TUE SEP 5 2017

MAC011-027-052230-
/O.CON.KBOX.SV.W.0073.000000T0000Z-170905T2230Z/
Worcester MA-Franklin MA-
558 PM EDT TUE SEP 5 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM EDT
FOR NORTHWESTERN WORCESTER AND NORTHEASTERN FRANKLIN COUNTIES...

At 557 PM EDT, a severe thunderstorm was located over Northfield, or
8 miles northeast of Greenfield, moving northeast at 30 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...
Orange, Winchester, Northfield, Bernardston, Erving, Gill, Royalston,
Richmond, Wendell, Warwick and South Vernon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4272 7216 4271 7215 4258 7244 4267 7254
      4273 7247
TIME...MOT...LOC 2157Z 234DEG 21KT 4266 7245 

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

DUNTEN

950 
WWUS51 KBOX 052223
SVSBOX

Severe Weather Statement
National Weather Service Taunton MA
623 PM EDT TUE SEP 5 2017

MAC011-027-052232-
/O.EXP.KBOX.SV.W.0073.000000T0000Z-170905T2230Z/
Worcester MA-Franklin MA-
623 PM EDT TUE SEP 5 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN WORCESTER AND
NORTHEASTERN FRANKLIN COUNTIES WILL EXPIRE AT 630 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning will be allowed to expire.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Taunton.

LAT...LON 4272 7216 4271 7215 4258 7244 4267 7254
      4273 7247
TIME...MOT...LOC 2222Z 234DEG 30KT 4278 7223 

$$

DUNTEN

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 5, 3:40 PM EDT	Flash Flood Watch	BOX	Barnstable, Bristol, Essex, Middlesex, Norfolk, Plymouth and 2 more	37 hr
Sep 5, 4:30 PM EDT	Special Weather Statement	BOX	Franklin	45 min
Sep 5, 5:24 PM EDT	Special Weather Statement	BOX	Franklin	51 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.