Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 99, NWS Boston/Norton, MA

August 8, 2011Barnstable County, Bristol County, Plymouth County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 8, 2011, 3:40 PM EDT for Barnstable County, Bristol County, Plymouth County, Massachusetts. It was in force for 31 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: Aug 8, 2011, 3:40 PM EDT (19:40 UTC)
Expired: Aug 8, 2011, 4:11 PM EDT
In force: 31 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon

Counties Barnstable County, MA, Bristol County, MA, Plymouth County, MA

The radar

The Boston radar (KBOX), 45 km from the middle of the area, began a volume at 19:42 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, 7.7 hours before the alert went out and 62 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: 551 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 629 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 70 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

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

314 
WUUS51 KBOX 081940
SVRBOX
MAC001-005-023-082030-
/O.NEW.KBOX.SV.W.0099.110808T1940Z-110808T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
340 PM EDT MON AUG 8 2011

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WEST CENTRAL BARNSTABLE COUNTY IN SOUTHEAST MASSACHUSETTS...
  EAST CENTRAL BRISTOL COUNTY IN SOUTHEAST MASSACHUSETTS...
  SOUTH CENTRAL PLYMOUTH COUNTY IN SOUTHEAST MASSACHUSETTS...

* UNTIL 430 PM EDT

* AT 337 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 ROCHESTER...OR 8 MILES
  NORTH OF NEW BEDFORD...AND WAS MOVING SOUTHEAST AT 30 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...WAREHAM...MATTAPOISETT...
  MARION AND BOURNE.

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.

&&

LAT...LON 4176 7052 4160 7066 4166 7065 4169 7068
      4172 7068 4172 7071 4167 7071 4167 7072
      4168 7074 4164 7076 4165 7079 4161 7081
      4175 7094 4182 7086
TIME...MOT...LOC 1940Z 307DEG 24KT 4175 7086

$$

THOMPSON

1 follow-up statement

258 
WWUS51 KBOX 082011
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
411 PM EDT MON AUG 8 2011

MAC001-005-023-082020-
/O.CAN.KBOX.SV.W.0099.000000T0000Z-110808T2030Z/
PLYMOUTH MA-BRISTOL MA-BARNSTABLE MA-
411 PM EDT MON AUG 8 2011

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL BARNSTABLE...EAST
CENTRAL BRISTOL AND SOUTH CENTRAL PLYMOUTH COUNTIES IN SOUTHEAST
MASSACHUSETTS IS CANCELLED...

THIS STORM HAS WEAKENED. HOWEVER...ADDITIONAL STRONG THUNDERSTORMS 
MAY AFFECT THE AREA AFTER 5 PM.

LAT...LON 4176 7052 4160 7066 4166 7065 4169 7068
      4172 7068 4172 7071 4167 7071 4167 7072
      4168 7074 4164 7076 4165 7079 4161 7081
      4175 7094 4182 7086
TIME...MOT...LOC 2010Z 307DEG 24KT 4163 7065

$$

THOMPSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 8, 12:48 AM EDT	Areal Flood Advisory	BOX	Franklin, Middlesex, Worcester	3 hr
Aug 8, 1:16 AM EDT	Special Weather Statement	BOX	Middlesex	44 min
Aug 8, 2:45 AM EDT	Special Weather Statement	BOX	Essex	45 min
Aug 8, 2:43 PM EDT	Special Weather Statement	BOX	Suffolk	47 min
Aug 8, 2:52 PM EDT	Special Weather Statement	BOX	Bristol	38 min
Aug 8, 3:16 PM EDT	Special Weather Statement	BOX	Bristol	44 min
Aug 8, 3:46 PM EDT	Special Marine Warning	BOX		44 min
Aug 8, 4:00 PM EDT	Special Weather Statement	BOX	Bristol	45 min
Aug 8, 4:03 PM EDT	Special Marine Warning	BOX		42 min
Aug 8, 4:32 PM EDT	Special Marine Warning	BOX		43 min
Aug 8, 4:36 PM EDT	Severe Thunderstorm Warning	BOX	Dukes	24 min
Aug 8, 4:40 PM EDT	Areal Flood Advisory	BOX	Bristol, Plymouth	109 min
Aug 8, 5:26 PM EDT	Special Marine Warning	BOX		49 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2011 Every severe thunderstorm warning in 2011

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.