Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 98, NWS Boston/Norton, MA

August 18, 2012Newport County, Rhode Island; Barnstable County, Bristol County, Plymouth County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 18, 2012, 4:47 AM EDT for Newport County, Rhode Island; Barnstable County, Bristol County, Plymouth County, Massachusetts. It was in force for 58 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 18, 2012, 4:47 AM EDT (08:47 UTC)
Expired
Aug 18, 2012, 5:45 AM EDT
In force
58 min
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon

Counties Barnstable County, MA, Bristol County, MA, Plymouth County, MA, Newport County, RI

The radar

The Boston radar (KBOX), 38 km from the middle of the area, began a volume at 08:50 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 00:00Z, 8.8 hours before the alert went out and 64 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 00:00Z on 2012-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 287 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, Chatham, MA at 00:00Z on 2012-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 43 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
287 J/kg
Mixed-layer CIN
-52 J/kg
Mixed-layer LCL
1077 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
43 m²/s²
0-3 km storm-relative helicity
69 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.

904 
WUUS51 KBOX 180847
SVRBOX
MAC001-005-023-RIC005-180945-
/O.NEW.KBOX.SV.W.0098.120818T0847Z-120818T0945Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
447 AM EDT SAT AUG 18 2012

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN NEWPORT COUNTY IN RHODE ISLAND...
  WEST CENTRAL BARNSTABLE COUNTY IN SOUTHEAST MASSACHUSETTS...
  SOUTHERN BRISTOL COUNTY IN SOUTHEAST MASSACHUSETTS...
  THIS INCLUDES THE CITIES OF...NEW BEDFORD...FALL RIVER...
  PLYMOUTH COUNTY IN SOUTHEAST MASSACHUSETTS...
  THIS INCLUDES THE CITY OF PLYMOUTH...

* UNTIL 545 AM EDT

* AT 445 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  WESTPORT...OR NEAR FALL RIVER...AND WAS MOVING NORTHEAST AT 35 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...BERKLEY...FREETOWN...
  ACUSHNET...LAKEVILLE...MATTAPOISETT...MIDDLEBOROUGH...ROCHESTER...
  MARION...WAREHAM...HALIFAX...PLYMPTON...CARVER...BOURNE...KINGSTON
  AND SANDWICH.

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 4170 7064 4171 7064 4169 7068 4171 7067
      4172 7071 4168 7071 4168 7074 4167 7074
      4157 7110 4176 7123 4211 7073 4201 7066
      4201 7069 4199 7069 4197 7066 4199 7066
      4197 7064 4174 7047
TIME...MOT...LOC 0846Z 243DEG 29KT 4170 7104

$$

MD
2 follow-up statements
058 
WWUS51 KBOX 180915
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
515 AM EDT SAT AUG 18 2012

RIC005-180925-
/O.CAN.KBOX.SV.W.0098.000000T0000Z-120818T0945Z/
NEWPORT RI-
515 AM EDT SAT AUG 18 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN NEWPORT COUNTY IS
CANCELLED...

LAT...LON 4170 7064 4171 7064 4169 7068 4171 7067
      4172 7071 4168 7071 4168 7074 4167 7074
      4163 7089 4185 7107 4211 7073 4201 7066
      4201 7069 4199 7069 4197 7066 4199 7066
      4197 7064 4174 7047
TIME...MOT...LOC 0915Z 243DEG 29KT 4180 7076

$$

MAC001-005-023-180945-
/O.CON.KBOX.SV.W.0098.000000T0000Z-120818T0945Z/
PLYMOUTH MA-BRISTOL MA-BARNSTABLE MA-
515 AM EDT SAT AUG 18 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 AM EDT
FOR WEST CENTRAL BARNSTABLE...EAST CENTRAL BRISTOL AND PLYMOUTH
COUNTIES IN SOUTHEAST MASSACHUSETTS...

AT 511 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR ROCHESTER...OR 11 MILES NORTHEAST OF NEW BEDFORD...
MOVING NORTHEAST AT 35 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
HALIFAX...PLYMPTON...CARVER...BOURNE...KINGSTON...PLYMOUTH AND
SANDWICH

LAT...LON 4170 7064 4171 7064 4169 7068 4171 7067
      4172 7071 4168 7071 4168 7074 4167 7074
      4163 7089 4185 7107 4211 7073 4201 7066
      4201 7069 4199 7069 4197 7066 4199 7066
      4197 7064 4174 7047
TIME...MOT...LOC 0915Z 243DEG 29KT 4180 7076

$$

MD
645 
WWUS51 KBOX 180942
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
542 AM EDT SAT AUG 18 2012

MAC001-005-023-180952-
/O.EXP.KBOX.SV.W.0098.000000T0000Z-120818T0945Z/
PLYMOUTH MA-BRISTOL MA-BARNSTABLE MA-
542 AM EDT SAT AUG 18 2012

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL BARNSTABLE...EAST
CENTRAL BRISTOL AND PLYMOUTH COUNTIES IN SOUTHEAST MASSACHUSETTS WILL
EXPIRE AT 545 AM EDT...

LAT...LON 4170 7064 4171 7064 4169 7068 4171 7067
      4172 7071 4168 7071 4168 7074 4167 7074
      4163 7089 4185 7107 4211 7073 4201 7066
      4201 7069 4199 7069 4197 7066 4199 7066
      4197 7064 4174 7047
TIME...MOT...LOC 0942Z 243DEG 29KT 4190 7050

$$

MD

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 17, 10:54 PM EDTSpecial Weather StatementBOXProvidence51 min
Aug 17, 8:04 PM EDTSpecial Weather StatementBOXHampden56 min
Aug 17, 8:35 PM EDTSpecial Weather StatementBOXMiddlesex, Worcester55 min
Aug 17, 8:37 PM EDTSevere Thunderstorm WarningBOXMiddlesex, Worcester34 min
Aug 17, 9:24 PM EDTSpecial Weather StatementBOXSuffolk36 min
Aug 17, 11:22 PM EDTSpecial Weather StatementBOXNorfolk23 min
Aug 18, 3:34 AM EDTSpecial Marine WarningBOX56 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2012Severe Thunderstorm Warnings in Rhode Island, 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.