Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 112, NWS Boston/Norton, MA

September 18, 2012Capitol Planning Region, Connecticut; Franklin County, Hampden County, Hampshire County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Sep 18, 2012, 8:18 PM EDT for Capitol Planning Region, Connecticut; Franklin County, Hampden County, Hampshire County, Massachusetts. It was in force for 57 min. 4 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: Sep 18, 2012, 8:18 PM EDT (00:18 UTC)
Expired: Sep 18, 2012, 9:15 PM EDT
In force: 57 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon

Counties Capitol Planning Region, CT, Franklin County, MA, Hampden County, MA, Hampshire County, MA

The radar

The Albany radar (KENX), 107 km from the middle of the area, began a volume at 00:21 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
Sep 18, 8:30 PM EDT	NON-TSTM WND GST 64	West Cummington, MA	2000 EL
Sep 18, 8:55 PM EDT	TSTM WND DMG	Barkhamsted, CT	TREES DOWN
Sep 18, 8:56 PM EDT	TSTM WND DMG	Westfield, MA	TREE AND WIRES ON EAST MOUNTAIN ROAD
Sep 18, 9:08 PM EDT	TSTM WND DMG	Southwick, MA	TREE AND WIRES DOWN ON FEEDING HILLS ROAD

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Sep 18, 7:54 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Albany, NY (KALY), launched 00:00Z, 0.3 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: 47 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 675 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: -4 m²/s²
0-3 km storm-relative helicity: 47 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

261 
WUUS51 KBOX 190018
SVRBOX
CTC003-013-MAC011-013-015-190115-
/O.NEW.KBOX.SV.W.0112.120919T0018Z-120919T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
818 PM EDT TUE SEP 18 2012

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  HARTFORD COUNTY IN NORTHERN CONNECTICUT...
  THIS INCLUDES THE CITIES OF...WINDSOR LOCKS...NEW BRITAIN...   
  MANCHESTER...HARTFORD...BRISTOL...
  NORTHWESTERN TOLLAND COUNTY IN NORTHERN CONNECTICUT...
  THIS INCLUDES THE CITY OF VERNON...
  FRANKLIN COUNTY IN WESTERN MASSACHUSETTS...
  THIS INCLUDES THE CITY OF GREENFIELD...
  HAMPDEN COUNTY IN WESTERN MASSACHUSETTS...
  THIS INCLUDES THE CITIES OF...SPRINGFIELD...CHICOPEE...
  HAMPSHIRE COUNTY IN WESTERN MASSACHUSETTS...
  THIS INCLUDES THE CITIES OF...NORTHAMPTON...AMHERST...

* UNTIL 915 PM EDT

* AT 811 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM GREAT BARRINGTON MASSACHUSETTS THROUGH DANBURY CONNECTICUT.   
  THE STORMS WERE MOVING NORTHEAST AT 50 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...
  GREENFIELD...NORTHAMPTON...SPRINGFIELD...HARTFORD...AND VERNON.

WHILE NOT IMMEDIATELY LIKELY...THUNDERSTORMS CAN SOMETIMES PRODUCE A 
TORNADO. REMAIN CALM...BUT TAKE COVER NOW. GO TO AN INTERIOR 
ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS.

&&

LAT...LON 4225 7301 4239 7307 4240 7301 4263 7296
      4268 7299 4270 7296 4270 7302 4274 7301
      4271 7233 4172 7246 4164 7250 4162 7271
      4154 7285 4155 7294 4180 7302 4181 7295
      4197 7290 4197 7303 4203 7302 4210 7308
TIME...MOT...LOC 0011Z 224DEG 45KT 4220 7330 4119 7345
          4009 7424

$$

WTB

1 follow-up statement

172 
WWUS51 KBOX 190102
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
902 PM EDT TUE SEP 18 2012

CTC003-013-MAC011-013-015-190115-
/O.CON.KBOX.SV.W.0112.000000T0000Z-120919T0115Z/
HARTFORD CT-TOLLAND CT-FRANKLIN MA-HAMPSHIRE MA-HAMPDEN MA-
902 PM EDT TUE SEP 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM EDT
FOR HAMPDEN...HAMPSHIRE...FRANKLIN...NORTHWESTERN TOLLAND AND
HARTFORD COUNTIES...

AT 900 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE 
EXTENDING FROM COLRAIN TO SOUTHINGTON...MOVING NORTHEAST AT 50 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 
ORANGE...NORTHAMPTON...SPRINGFIELD...HARTFORD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM PRODUCED A 64 MPH WIND GUST IN WEST CUMMINGTON 
MASSACHUSETTS. 

SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM 
WINDOWS! 

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 300 AM EDT
WEDNESDAY MORNING FOR NORTHERN CONNECTICUT AND MASSACHUSETTS AND
SOUTHERN NEW HAMPSHIRE AND CENTRAL RHODE ISLAND.

&&

LAT...LON 4225 7301 4239 7307 4240 7301 4263 7296
      4268 7299 4270 7296 4270 7302 4274 7301
      4271 7233 4172 7246 4164 7250 4162 7271
      4154 7285 4155 7294 4180 7302 4181 7295
      4197 7290 4197 7303 4203 7302 4210 7308
TIME...MOT...LOC 0059Z 224DEG 45KT 4263 7273 4162 7289
          4052 7370

$$

WTB

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 18, 8:52 PM EDT	Areal Flood Advisory	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	5 hr
Sep 18, 9:16 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	59 min
Sep 18, 10:16 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	59 min
Sep 18, 10:34 PM EDT	Special Weather Statement	BOX		86 min
Sep 18, 11:16 PM EDT	Severe Thunderstorm Warning	BOX	Northeastern Connecticut Planning Region	59 min
Sep 18, 11:27 PM EDT	Areal Flood Advisory	BOX	Northeastern Connecticut Planning Region	6 hr
Sep 19, 12:27 AM EDT	Areal Flood Warning	BOX	Hampshire	80 min
Sep 19, 12:37 AM EDT	Special Marine Warning	BOX		83 min
Sep 19, 12:49 AM EDT	Special Weather Statement	BOX	Norfolk, Suffolk	56 min
Sep 19, 1:01 AM EDT	Special Marine Warning	BOX		59 min
Sep 19, 1:35 AM EDT	Special Marine Warning	BOX		85 min
Sep 19, 1:59 AM EDT	Special Marine Warning	BOX		61 min
Sep 19, 2:18 AM EDT	Special Weather Statement	BOX	Barnstable, Bristol, Plymouth	87 min
Sep 19, 4:07 AM EDT	High Surf Advisory	BOX	Dukes, Nantucket	12 hr
Sep 19, 5:50 AM EDT	Small Craft Advisory	BOX		22 hr

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2012 Severe Thunderstorm Warnings in Connecticut, 2012 Every severe thunderstorm warning in 2012

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.