Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 100, NWS Boston/Norton, MA

September 7, 2012Franklin County, Hampshire County, Worcester County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Sep 7, 2012, 7:34 PM EDT for Franklin County, Hampshire County, Worcester County, Massachusetts. It was in force for 26 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 7, 2012, 7:34 PM EDT (23:34 UTC)
Expired: Sep 7, 2012, 8:00 PM EDT
In force: 26 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon

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

The radar

The Boston radar (KBOX), 105 km from the middle of the area, began a volume at 23:36 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, 11.6 hours before the alert went out and 131 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: 14 J/kg
Mixed-layer CIN: -291 J/kg
Mixed-layer LCL: 1354 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: -64 m²/s²
0-3 km storm-relative helicity: 67 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.

124 
WUUS51 KBOX 072334
SVRBOX
MAC011-015-027-080000-
/O.NEW.KBOX.SV.W.0100.120907T2334Z-120908T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
734 PM EDT FRI SEP 7 2012

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WEST CENTRAL WORCESTER COUNTY IN CENTRAL MASSACHUSETTS...
  EXTREME SOUTHEASTERN FRANKLIN COUNTY IN WESTERN MASSACHUSETTS...
  EAST CENTRAL HAMPSHIRE COUNTY IN WESTERN MASSACHUSETTS...

* UNTIL 800 PM EDT

* AT 732 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN         
  EXCESS OF 60 MPH AND HAIL UP TO QUARTER SIZE. THIS STORM           
  WAS LOCATED OVER EAST CENTRAL HAMPSHIRE COUNTY...OR 12 MILES       
  SOUTHEAST OF AMHERST...AND WAS MOVING NORTHEAST AT 5 MPH.

* THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL
  AREAS OF THE INDICATEDCOUNTIES.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT LIGHTNING WAS
OCCURRING WITH THIS STORM. GET INDOORS OR INSIDE A VEHICLE NOW! DO
NOT SEEK SHELTER UNDER TREES. IF YOU CAN HEAR THUNDER...YOU ARE CLOSE
ENOUGH TO BE STRUCK BY LIGHTNING.

&&

LAT...LON 4240 7231 4227 7217 4226 7234 4231 7240
TIME...MOT...LOC 2333Z 243DEG 4KT 4229 7232

$$

SIPPRELL

1 follow-up statement

742 
WWUS51 KBOX 072359
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
759 PM EDT FRI SEP 7 2012

MAC011-015-027-080009-
/O.EXP.KBOX.SV.W.0100.000000T0000Z-120908T0000Z/
WORCESTER MA-FRANKLIN MA-HAMPSHIRE MA-
759 PM EDT FRI SEP 7 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL HAMPSHIRE...
EXTREME SOUTHEASTERN FRANKLIN AND WEST CENTRAL WORCESTER COUNTIES
WILL EXPIRE AT 800 PM EDT...

THE STORM HAS MOVED OUT OF THE WARNED REGION...CONTINUING TO MOVE 
NORTHEASTWARD INTO NORTH-CENTRAL WORCESTER COUNTY.

LAT...LON 4240 7231 4227 7217 4226 7234 4231 7240
TIME...MOT...LOC 2359Z 243DEG 4KT 4230 7229

$$

SIPPRELL

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 7, 4:39 PM EDT	High Surf Advisory	BOX	Barnstable, Bristol, Dukes, Essex, Nantucket, Norfolk and 1 more	4 days
Sep 7, 4:42 PM EDT	Small Craft Advisory	BOX		4 days
Sep 7, 5:46 PM EDT	Special Weather Statement	BOX	Middlesex	59 min
Sep 7, 5:59 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex, Norfolk, Suffolk	46 min
Sep 7, 6:14 PM EDT	Special Weather Statement	BOX	Suffolk	31 min
Sep 7, 6:42 PM EDT	Areal Flood Advisory	BOX	Middlesex, Norfolk, Suffolk	55 min
Sep 7, 7:12 PM EDT	Special Weather Statement	BOX	Worcester	48 min
Sep 7, 7:20 PM EDT	Areal Flood Advisory	BOX	Essex, Middlesex, Norfolk, Suffolk	100 min
Sep 7, 7:53 PM EDT	Special Weather Statement	BOX	Worcester	52 min
Sep 7, 7:57 PM EDT	Areal Flood Advisory	BOX	Franklin, Hampshire, Worcester	93 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.