Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 113, NWS Boston/Norton, MA

September 6, 2014Hillsborough County, New Hampshire; Essex County, Middlesex County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Sep 6, 2014, 4:18 PM EDT for Hillsborough County, New Hampshire; Essex County, Middlesex County, Massachusetts. It was in force for 57 min. 13 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 6, 2014, 4:18 PM EDT (20:18 UTC)
Expired
Sep 6, 2014, 5:15 PM EDT
In force
57 min
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon

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

The radar

The Boston radar (KBOX), 87 km from the middle of the area, began a volume at 20:18 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

TimeReportWhereRemark
Sep 6, 4:37 PM EDTTSTM WND DMGBrookline, NHLARGE LIMB DOWN AT SILVER BEACH
Sep 6, 4:40 PM EDTTSTM WND DMGPelham, NHTREE DOWN ON OLD BRIDGE AND BRIDGE ROADS... ALSO ON MARSH AND ALBERT STREET.
Sep 6, 4:43 PM EDTTSTM WND DMGNashua, NHTREES AND WIRES DOWN ON HARRIS ROAD AND JILL DRIVE
Sep 6, 4:45 PM EDTTSTM WND DMGHudson, NHTREES DOWN. EXACT LOCATIONS UKNOWN AT THIS TIME.
Sep 6, 4:57 PM EDTTSTM WND DMGLowell, MATREE DOWN ON PERSON... INJURING LEG ON THE VFW PARKWAY AT AIKEN STREET IN THE BEAVER BROOK AREA
Sep 6, 4:57 PM EDTTSTM WND DMGLowell, MATREES DOWN ON VFW PARKWAY WITH PERSON TRAPPED
Sep 6, 4:58 PM EDTTSTM WND DMGDracut, MATREE AND POWER LINES DOWN ON HARLEM STREET
Sep 6, 4:58 PM EDTHAIL 0.88Dracut, MA
Sep 6, 5:00 PM EDTTSTM WND DMGMethuen, MALARGE TREE LIMBS DOWN ON OAK STREET
Sep 6, 5:00 PM EDTTSTM WND DMGPepperell, MA6 IN DIAMETER LIMBS DOWN AND WIRES DOWN ON NASHUA RD AND DOW ST.
Sep 6, 5:03 PM EDTTSTM WND DMGDracut, MATREE AND WIRES DOWN ON BRIDGE STREET
Sep 6, 5:20 PM EDTTSTM WND DMGHollis, NHTREES AND WIRES DOWN ON DOW ROAD
Sep 6, 5:20 PM EDTTSTM WND DMGMethuen, MAMULTIPLE TREES DOWN ACROSS TOWN.

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.

IssuedProductOfficeLasted
Sep 6, 1:22 PM EDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Gray, ME (KGYX), launched 12:00Z, 8.3 hours before the alert went out and 160 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 2014-09-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 494 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 2014-09-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 127 square meters per square second.1939Sfc1 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
494 J/kg
Mixed-layer CIN
-168 J/kg
Mixed-layer LCL
989 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
127 m²/s²
0-3 km storm-relative helicity
121 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

Open this sounding in Storm Lab

The text

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

578 
WUUS51 KBOX 062018
SVRBOX
MAC009-017-NHC011-062115-
/O.NEW.KBOX.SV.W.0113.140906T2018Z-140906T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
418 PM EDT SAT SEP 6 2014

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN MIDDLESEX COUNTY IN NORTHEASTERN MASSACHUSETTS...
  WEST CENTRAL ESSEX COUNTY IN NORTHEASTERN MASSACHUSETTS...
  SOUTHEASTERN HILLSBOROUGH COUNTY IN SOUTHERN NEW HAMPSHIRE...

* UNTIL 515 PM EDT

* AT 417 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN 
  EXCESS OF 60 MPH. THIS STORM WAS LOCATED OVER ASHBY...AND WAS 
  MOVING EAST AT 35 MPH.

* SOME LOCATIONS IMPACTED INCLUDE...
  LOWELL...NASHUA...LAWRENCE...METHUEN...BILLERICA...CHELMSFORD...
  ANDOVER...DRACUT...TEWKSBURY...HUDSON...WESTFORD...PELHAM...
  PEPPERELL...TYNGSBOROUGH...GROTON...TOWNSEND...HOLLIS...NEW
  IPSWICH...BROOKLINE AND DUNSTABLE.

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.

WHILE NOT IMMEDIATELY LIKELY...A SHORT LIVED TORNADO IS POSSIBLE IN 
ADDITION TO WIND DAMAGE. GO TO AN INTERIOR ROOM ON THE LOWEST FLOOR 
OF YOUR HOME OR BUSINESS.

&&

LAT...LON 4259 7117 4267 7186 4269 7188 4275 7188
      4277 7131 4276 7127 4274 7124 4275 7122
      4274 7119 4277 7118
TIME...MOT...LOC 2017Z 273DEG 30KT 4269 7182 
$$

JWD

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 6, 3:05 PM EDTSpecial Weather StatementBOXCheshire40 min
Sep 6, 3:08 PM EDTSevere Thunderstorm WarningBOXCheshire, Hillsborough31 min
Sep 6, 4:29 PM EDTTornado WarningBOXHillsborough31 min
Sep 6, 4:59 PM EDTSevere Thunderstorm WarningBOXHillsborough61 min
Sep 6, 6:19 AM EDTSmall Craft AdvisoryBOX13 hr
Sep 6, 3:35 PM EDTSpecial Weather StatementBOXFranklin40 min
Sep 6, 3:38 PM EDTSpecial Weather StatementBOXWorcester52 min
Sep 6, 3:48 PM EDTSpecial Weather StatementBOXEssex27 min
Sep 6, 3:52 PM EDTSpecial Marine WarningBOX53 min
Sep 6, 4:00 PM EDTSevere Thunderstorm WarningBOXFranklin, Worcester60 min
Sep 6, 4:22 PM EDTTornado WarningBOXFranklin, Worcester24 min
Sep 6, 5:00 PM EDTSpecial Marine WarningBOX60 min
Sep 6, 5:03 PM EDTSevere Thunderstorm WarningBOXMiddlesex, Worcester42 min
Sep 6, 5:36 PM EDTSpecial Weather StatementBOXEssex, Middlesex, Norfolk, Worcester84 min
Sep 6, 5:43 PM EDTSevere Thunderstorm WarningBOXFranklin, Hampshire, Worcester26 min
Sep 6, 5:50 PM EDTSevere Thunderstorm WarningBOXEssex, Middlesex40 min
Sep 6, 5:55 PM EDTSpecial Marine WarningBOX65 min
Sep 6, 6:01 PM EDTSpecial Weather StatementBOXWorcester44 min
Sep 6, 6:02 PM EDTSpecial Weather StatementBOXSuffolk43 min
Sep 6, 6:06 PM EDTSpecial Marine WarningBOX54 min
Sep 6, 6:08 PM EDTAreal Flood AdvisoryBOXEssex, Middlesex, Norfolk, Suffolk112 min
Sep 6, 6:25 PM EDTSpecial Weather StatementBOXMiddlesex50 min
Sep 6, 7:38 PM EDTSpecial Weather StatementBOXPlymouth52 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2014Severe Thunderstorm Warnings in New Hampshire, 2014Every severe thunderstorm warning in 2014

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.