Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 21, NWS Boston/Norton, MA

June 12, 2015Hampden County, Hampshire County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jun 12, 2015, 10:09 PM EDT for Hampden County, Hampshire County, Massachusetts. It was in force for 51 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
Jun 12, 2015, 10:09 PM EDT (02:09 UTC)
Expired
Jun 12, 2015, 11:00 PM EDT
In force
51 min
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon

Counties Hampden County, MA, Hampshire County, MA

The radar

The Albany radar (KENX), 98 km from the middle of the area, began a volume at 02:10 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 00:00Z, 2.2 hours before the alert went out and 87 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-pSkew-T log-p diagram, Albany, NY at 00:00Z on 2015-06-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 293 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Albany, NY at 00:00Z on 2015-06-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 262 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
293 J/kg
Mixed-layer CIN
-121 J/kg
Mixed-layer LCL
1499 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
262 m²/s²
0-3 km storm-relative helicity
360 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.6

Open this sounding in Storm Lab

The text

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

423 
WUUS51 KBOX 130209
SVRBOX
MAC013-015-130300-
/O.NEW.KBOX.SV.W.0021.150613T0209Z-150613T0300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
1009 PM EDT FRI JUN 12 2015

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN HAMPSHIRE COUNTY IN WESTERN MASSACHUSETTS...
  WESTERN HAMPDEN COUNTY IN WESTERN MASSACHUSETTS...

* UNTIL 1100 PM EDT

* AT 1008 PM EDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
  THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 
  MPH. THESE STORMS WERE LOCATED FROM PITTSFIELD MASSACHUSETTS TO 
  HOUSATONIC NEW YORK TO LIVINGSTON NEW YORK...AND WAS MOVING EAST 
  AT 45 MPH.

* SOME LOCATIONS IMPACTED INCLUDE...
  WESTFIELD...NORTHAMPTON...EASTHAMPTON...SOUTHAMPTON...
  WILLIAMSBURG...HUNTINGTON...RUSSELL...WESTHAMPTON...GRANVILLE...
  CHESTER...BLANDFORD...CHESTERFIELD...WORTHINGTON...MONTGOMERY...
  MIDDLEFIELD AND TOLLAND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS AND LARGE HAIL. GO
INDOORS AND STAY AWAY FROM WINDOWS.  DRIVERS SHOULD PREPARE FOR LOW
VISIBILITY AND AVOID FLOODED ROADS.

&&

LAT...LON 4212 7306 4215 7307 4215 7303 4231 7300
      4231 7303 4233 7306 4238 7307 4238 7301
      4245 7299 4236 7265 4218 7273 4216 7276
      4205 7293 4206 7306 4210 7307
TIME...MOT...LOC 0208Z 277DEG 39KT 4246 7329 4225 7338 4212 7374 
$$
FIELD
1 follow-up statement
307 
WWUS51 KBOX 130230
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
1030 PM EDT FRI JUN 12 2015

MAC013-015-130300-
/O.CON.KBOX.SV.W.0021.000000T0000Z-150613T0300Z/
HAMPSHIRE MA-HAMPDEN MA-
1030 PM EDT FRI JUN 12 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM EDT
FOR SOUTHWESTERN HAMPSHIRE AND WESTERN HAMPDEN COUNTIES...

AT 1029 PM EDT...DOPPLER RADAR INDICATED A LINE OF STRONG AND 
POTENTIALLY SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS 
OF 50 TO 60 MPH. THESE STORMS WERE LOCATED FROM NEAR WORTHINGTON TO 
OTIS TO NEAR SHEFFIELD...MOVING EAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE...
WESTFIELD...NORTHAMPTON...EASTHAMPTON...SOUTHAMPTON...WILLIAMSBURG...
HUNTINGTON...RUSSELL...WESTHAMPTON...GRANVILLE...CHESTER...
BLANDFORD...CHESTERFIELD...WORTHINGTON...MONTGOMERY...MIDDLEFIELD AND
TOLLAND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS AND DESTRUCTIVE HAIL. GO
INSIDE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR
BUSINESS. DRIVERS SHOULD EXPECT POOR VISIBILITY AND AVOID FLOODED
ROADS.

&&

LAT...LON 4233 7306 4238 7304 4238 7301 4244 7299
      4242 7287 4236 7265 4218 7273 4216 7276
      4205 7293 4206 7306 4210 7307 4212 7306
      4215 7307 4215 7303 4231 7300 4231 7303
TIME...MOT...LOC 0229Z 280DEG 41KT 4242 7299 4221 7308 4208 7344 

$$
FIELD

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 12, 8:59 PM EDTSpecial Weather StatementBOXFranklin46 min
Jun 12, 9:13 PM EDTDense Fog AdvisoryBOXBarnstable, Bristol, Dukes, Nantucket, Plymouth5 hr
Jun 12, 9:28 PM EDTSpecial Weather StatementBOXFranklin47 min
Jun 12, 9:58 PM EDTSevere Thunderstorm WarningBOXFranklin, Hampshire47 min
Jun 12, 10:26 PM EDTSpecial Weather StatementBOXHampden, Worcester64 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2015Every severe thunderstorm warning in 2015

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.