Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 104, NWS Boston/Norton, MA

September 8, 2012Essex County, Middlesex County, Worcester County, Massachusetts; Hillsborough County, New Hampshire

NWS Boston/Norton, MA issued this severe thunderstorm warning at Sep 8, 2012, 5:32 PM EDT for Essex County, Middlesex County, Worcester County, Massachusetts; Hillsborough County, New Hampshire. It was in force for 36 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 8, 2012, 5:32 PM EDT (21:32 UTC)
Expired
Sep 8, 2012, 6:08 PM EDT
In force
36 min
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon

Counties Essex County, MA, Middlesex County, MA, Worcester County, MA, Hillsborough County, NH

The radar

The Boston radar (KBOX), 88 km from the middle of the area, began a volume at 21:36 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 watch it was issued in

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

IssuedProductOfficeLasted
Sep 8, 4:47 PM EDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Gray, ME (KGYX), launched 12:00Z, 9.5 hours before the alert went out and 152 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, Gray, ME at 12:00Z on 2012-09-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1021 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Gray, ME at 12:00Z on 2012-09-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 176 square meters per square second.193958Sfc1 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
1021 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
466 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
176 m²/s²
0-3 km storm-relative helicity
216 m²/s²
Significant tornado parameter
0.9
Supercell composite
7.2

Open this sounding in Storm Lab

The text

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

272 
WUUS51 KBOX 082132
SVRBOX
MAC009-017-027-NHC011-082230-
/O.NEW.KBOX.SV.W.0104.120908T2132Z-120908T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
532 PM EDT SAT SEP 8 2012

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN WORCESTER COUNTY IN CENTRAL MASSACHUSETTS...
  NORTHWESTERN ESSEX COUNTY IN EASTERN MASSACHUSETTS...
  NORTH CENTRAL MIDDLESEX COUNTY IN SOUTHEAST MASSACHUSETTS...
  THIS INCLUDES THE CITY OF LOWELL...
  SOUTHEASTERN HILLSBOROUGH COUNTY IN SOUTHERN NEW HAMPSHIRE...

* UNTIL 630 PM EDT

* AT 531 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED NEAR LITTLETON...OR 12 MILES
  SOUTHWEST OF LOWELL...AND WAS MOVING NORTHEAST AT 40 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...WESTFORD...CHELMSFORD...
  DUNSTABLE...TYNGSBORO...DRACUT...HUDSON AND PELHAM.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS AND LARGE HAIL...AS WELL
AS DEADLY LIGHTNING AND TORRENTIAL RAIN. GET TO SAFE SHELTER NOW...
INSIDE A STURDY BUILDING OR IN A VEHICLE. DO NOT SEEK SHELTER UNDER
TREES. IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY
LIGHTNING. DRIVERS SHOULD BE ALERT FOR PONDING OF WATER AND AVOID
FLOODED ROADS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT
SATURDAY EVENING FOR NORTHERN CONNECTICUT AND MASSACHUSETTS AND
SOUTHERN NEW HAMPSHIRE AND CENTRAL RHODE ISLAND.

&&

LAT...LON 4247 7154 4251 7161 4284 7143 4283 7138
      4278 7134 4274 7119 4279 7119 4282 7116
      4283 7113 4281 7107 4286 7103 4287 7097
TIME...MOT...LOC 2132Z 213DEG 34KT 4255 7152

$$

NOCERA
1 follow-up statement
018 
WWUS51 KBOX 082208
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
608 PM EDT SAT SEP 8 2012

MAC009-017-027-NHC011-082218-
/O.CAN.KBOX.SV.W.0104.000000T0000Z-120908T2230Z/
MIDDLESEX MA-WORCESTER MA-HILLSBOROUGH NH-ESSEX MA-
608 PM EDT SAT SEP 8 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN ESSEX...
SOUTHEASTERN HILLSBOROUGH...NORTHEASTERN WORCESTER AND NORTH CENTRAL
MIDDLESEX COUNTIES IS CANCELLED...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT
SATURDAY EVENING FOR NORTHERN CONNECTICUT AND MASSACHUSETTS AND
SOUTHERN NEW HAMPSHIRE AND CENTRAL RHODE ISLAND.

LAT...LON 4247 7154 4251 7161 4284 7143 4283 7138
      4278 7134 4274 7119 4279 7119 4282 7116
      4283 7113 4281 7107 4286 7103 4287 7097
TIME...MOT...LOC 2208Z 213DEG 34KT 4284 7127

$$

NOCERA

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 8, 2:06 PM EDTSpecial Weather StatementBOXFranklin24 min
Sep 8, 2:30 PM EDTSevere Thunderstorm WarningBOXHampden, Hampshire45 min
Sep 8, 3:51 PM EDTSpecial Weather StatementBOXHampden24 min
Sep 8, 5:09 PM EDTSpecial Weather StatementBOXMiddlesex51 min
Sep 8, 5:45 PM EDTSevere Thunderstorm WarningBOXFranklin, Hampden, Hampshire, Worcester60 min
Sep 8, 5:56 PM EDTSevere Thunderstorm WarningBOXHampden, Hampshire64 min
Sep 8, 6:31 PM EDTSevere Thunderstorm WarningBOXFranklin, Hampden, Hampshire, Middlesex, Worcester59 min
Sep 8, 6:50 PM EDTSevere Thunderstorm WarningBOXHampden, Hampshire25 min
Sep 8, 6:58 PM EDTSevere Thunderstorm WarningBOXFranklin, Hampden, Hampshire, Worcester32 min
Sep 8, 7:15 PM EDTSevere Thunderstorm WarningBOXHampden, Hampshire30 min
Sep 8, 7:30 PM EDTSevere Thunderstorm WarningBOXFranklin, Hampden, Hampshire, Middlesex, Worcester60 min
Sep 8, 4:09 PM EDTSpecial Weather StatementBOXCheshire51 min
Sep 8, 4:30 PM EDTSevere Thunderstorm WarningBOXCheshire, Hillsborough45 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2012Severe Thunderstorm Warnings in New Hampshire, 2012Every 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.