Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 49, NWS Boston/Norton, MA

July 7, 2014Middlesex County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 7, 2014, 6:11 PM EDT for Middlesex County, Massachusetts. It was in force for 34 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
Jul 7, 2014, 6:11 PM EDT (22:11 UTC)
Expired
Jul 7, 2014, 6:45 PM EDT
In force
34 min
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon

County Middlesex County, MA

The radar

The Boston radar (KBOX), 54 km from the middle of the area, began a volume at 22:12 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

Chatham, MA (KCHH), launched 12:00Z, 10.2 hours before the alert went out and 134 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, Chatham, MA at 12:00Z on 2014-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Chatham, MA at 12:00Z on 2014-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 55 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1151 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
55 m²/s²
0-3 km storm-relative helicity
60 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.

849 
WUUS51 KBOX 072211
SVRBOX
MAC017-072245-
/O.NEW.KBOX.SV.W.0049.140707T2211Z-140707T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
611 PM EDT MON JUL 7 2014

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL MIDDLESEX COUNTY IN NORTHEAST MASSACHUSETTS...

* UNTIL 645 PM EDT

* AT 610 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 CONCORD...OR 7 MILES WEST OF
  LEXINGTON...AND WAS MOVING EAST AT 40 MPH.

* SOME LOCATIONS IMPACTED INCLUDE...
  CAMBRIDGE...NEWTON...WALTHAM...MEDFORD...ARLINGTON...WOBURN...
  WATERTOWN...LEXINGTON...BELMONT...BURLINGTON...ACTON...STONEHAM...
  WINCHESTER...CONCORD...SUDBURY...BEDFORD...WAYLAND...WESTON...
  LINCOLN AND CARLISLE.

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 4250 7111 4236 7115 4235 7117 4237 7142
      4253 7140
TIME...MOT...LOC 2210Z 267DEG 40KT 4244 7138 
$$

FRANK
2 follow-up statements
644 
WWUS51 KBOX 072224
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
624 PM EDT MON JUL 7 2014

MAC017-072245-
/O.CON.KBOX.SV.W.0049.000000T0000Z-140707T2245Z/
MIDDLESEX MA-
624 PM EDT MON JUL 7 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR EAST CENTRAL MIDDLESEX COUNTY...

AT 624 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 LEXINGTON...MOVING EAST AT 40 MPH.

LOCATIONS IMPACTED INCLUDE...
CAMBRIDGE...NEWTON...WALTHAM...MEDFORD...ARLINGTON...WOBURN...
WATERTOWN...LEXINGTON...BELMONT...BURLINGTON...STONEHAM...
WINCHESTER...CONCORD...SUDBURY...BEDFORD...WAYLAND...WESTON AND
LINCOLN.

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 4250 7111 4236 7115 4235 7117 4238 7138
      4249 7135
TIME...MOT...LOC 2224Z 268DEG 33KT 4243 7124 

$$

JWD
713 
WWUS51 KBOX 072238
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
638 PM EDT MON JUL 7 2014

MAC017-072247-
/O.EXP.KBOX.SV.W.0049.000000T0000Z-140707T2245Z/
MIDDLESEX MA-
638 PM EDT MON JUL 7 2014

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL MIDDLESEX COUNTY
WILL EXPIRE AT 645 PM EDT...
        
THE STORM WHICH PROMPTED THE WARNING WAS MOVING OUT OF THE AREA. 
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE AT 645 PM.

A SEVERE THUNDERSTORM WARNING IS IN EFFECT UNTIL 7 PM FOR LOCATIONS 
FARTHER TO THE EAST...INCLUDING BOSTON.

&&

LAT...LON 4250 7111 4236 7115 4235 7117 4238 7138
      4249 7135
TIME...MOT...LOC 2236Z 267DEG 40KT 4243 7124 

$$

JWD

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 7, 2:25 PM EDTSpecial Weather StatementBOXFranklin65 min
Jul 7, 2:41 PM EDTSevere Thunderstorm WarningBOXFranklin49 min
Jul 7, 3:21 PM EDTSevere Thunderstorm WarningBOXFranklin, Worcester28 min
Jul 7, 3:46 PM EDTSevere Thunderstorm WarningBOXFranklin, Middlesex, Worcester44 min
Jul 7, 4:21 PM EDTSevere Thunderstorm WarningBOXMiddlesex, Worcester39 min
Jul 7, 4:24 PM EDTFlash Flood WarningBOXMiddlesex, Worcester111 min
Jul 7, 4:41 PM EDTSevere Thunderstorm WarningBOXFranklin, Worcester37 min
Jul 7, 4:48 PM EDTTornado WarningBOXMiddlesex, Worcester42 min
Jul 7, 5:12 PM EDTSevere Thunderstorm WarningBOXMiddlesex, Worcester36 min
Jul 7, 5:29 PM EDTSevere Thunderstorm WarningBOXEssex, Middlesex, Suffolk46 min
Jul 7, 5:32 PM EDTSpecial Marine WarningBOX58 min
Jul 7, 5:40 PM EDTSevere Thunderstorm WarningBOXMiddlesex, Worcester36 min
Jul 7, 5:51 PM EDTTornado WarningBOXMiddlesex, Suffolk24 min
Jul 7, 6:33 PM EDTSevere Thunderstorm WarningBOXEssex, Middlesex, Suffolk27 min
Jul 7, 6:36 PM EDTSpecial Marine WarningBOX24 min
Jul 7, 6:52 PM EDTSpecial Weather StatementBOXFranklin, Hampshire, Worcester83 min
Jul 7, 7:16 PM EDTSevere Thunderstorm WarningBOXFranklin, Hampden, Hampshire44 min

Nearby

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