Alert archive / Rhode Island / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 87, NWS Boston/Norton, MA

August 10, 2012Bristol County, Massachusetts; Bristol County, Kent County, Providence County, Rhode Island

NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 10, 2012, 5:33 PM EDT for Bristol County, Massachusetts; Bristol County, Kent County, Providence County, Rhode Island. It was in force for 27 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 10, 2012, 5:33 PM EDT (21:33 UTC)
Expired
Aug 10, 2012, 6:00 PM EDT
In force
27 min
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon

Counties Bristol County, MA, Bristol County, RI, Kent County, RI, Providence County, RI

The radar

The Boston radar (KBOX), 25 km from the middle of the area, began a volume at 21:35 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
Aug 10, 3:31 PM EDTTornado WatchSPC5 hr

The nearest sounding before it

Chatham, MA (KCHH), launched 12:00Z, 9.6 hours before the alert went out and 115 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 2012-08-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 424 joules per kilogram.LCLLFCEL10008507005003002001001 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 2012-08-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 60 square meters per square second.19395878Sfc1 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
424 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
475 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
60 m²/s²
0-3 km storm-relative helicity
77 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.

921 
WUUS51 KBOX 102133
SVRBOX
MAC005-RIC001-003-007-102200-
/O.NEW.KBOX.SV.W.0087.120810T2133Z-120810T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
533 PM EDT FRI AUG 10 2012

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN BRISTOL COUNTY IN RHODE ISLAND...
  THIS INCLUDES THE CITY OF BARRINGTON...
  EXTREME NORTHEASTERN KENT COUNTY IN RHODE ISLAND...
  SOUTHEASTERN PROVIDENCE COUNTY IN RHODE ISLAND...
  WEST CENTRAL BRISTOL COUNTY IN SOUTHEAST MASSACHUSETTS...

* UNTIL 600 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 BARRINGTON...AND WAS MOVING
  NORTH AT 25 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...EAST PROVIDENCE...
  SEEKONK...REHOBOTH AND PAWTUCKET.

A TORNADO WATCH IS ALSO IN EFFECT. SEVERE THUNDERSTORMS CAN PRODUCE
TORNADOES WITH LITTLE OR NO ADVANCED WARNING. REMAIN CALM...BUT TAKE
COVER NOW. GO TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY
BUILDING. AVOID WINDOWS.

DOPPLER RADAR INDICATED WEAK ROTATION WITHIN THIS STORM. WHILE NOT
IMMEDIATELY LIKELY...A TORNADO MAY DEVELOP. REMAIN CALM...BUT TAKE
COVER NOW. GO TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY
BUILDING. AVOID WINDOWS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM EDT FRIDAY EVENING FOR
NORTHERN CONNECTICUT AND MASSACHUSETTS AND CENTRAL RHODE ISLAND.

&&

LAT...LON 4175 7139 4177 7139 4178 7138 4178 7139
      4192 7137 4191 7121 4172 7128
TIME...MOT...LOC 2133Z 191DEG 22KT 4175 7134

$$
FIELD

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 10, 4:31 AM EDTSmall Craft AdvisoryBOX3 days
Aug 10, 10:57 AM EDTSpecial Weather StatementBOXHampshire63 min
Aug 10, 11:07 AM EDTSpecial Weather StatementBOXHampshire53 min
Aug 10, 11:35 AM EDTSpecial Weather StatementBOXHampden55 min
Aug 10, 11:40 AM EDTSpecial Weather StatementBOXFranklin65 min
Aug 10, 11:45 AM EDTSpecial Weather StatementBOXFranklin60 min
Aug 10, 11:52 AM EDTAreal Flood AdvisoryBOXFranklin, Hampden, Hampshire6 hr
Aug 10, 12:29 PM EDTSpecial Weather StatementBOXHampshire61 min
Aug 10, 1:15 PM EDTSevere Thunderstorm WarningBOXHampden, Hampshire30 min
Aug 10, 2:29 PM EDTSpecial Weather StatementBOXWorcester61 min
Aug 10, 3:13 PM EDTSpecial Marine WarningBOX92 min
Aug 10, 3:36 PM EDTAreal Flood AdvisoryBOXBristol, Hampden, Hampshire, Middlesex, Norfolk, Plymouth and 2 more2 hr
Aug 10, 4:45 PM EDTSpecial Marine WarningBOX30 min
Aug 10, 4:45 PM EDTSevere Thunderstorm WarningBOXHampden, Worcester45 min
Aug 10, 5:00 PM EDTTornado WarningBOXHampden, Hampshire45 min
Aug 10, 5:03 PM EDTSpecial Marine WarningBOX87 min
Aug 10, 5:09 PM EDTFlash Flood WarningBOXBristol, Plymouth3 hr
Aug 10, 5:16 PM EDTSevere Thunderstorm WarningBOXBristol, Plymouth59 min
Aug 10, 5:20 PM EDTSpecial Marine WarningBOX25 min
Aug 10, 5:27 PM EDTFlash Flood WarningBOXFranklin, Hampden, Hampshire, Middlesex, Norfolk, Suffolk and 1 more3 hr
Aug 10, 5:31 PM EDTSevere Thunderstorm WarningBOXHampden, Worcester44 min
Aug 10, 5:45 PM EDTSevere Thunderstorm WarningBOXFranklin, Hampden, Hampshire, Worcester45 min
Aug 10, 5:47 PM EDTSpecial Weather StatementBOXMiddlesex43 min
Aug 10, 5:55 PM EDTFlash Flood WarningBOXEssex3 hr
Aug 10, 6:08 PM EDTSpecial Marine WarningBOX52 min
Aug 10, 6:23 PM EDTSevere Thunderstorm WarningBOXBristol, Middlesex, Norfolk, Plymouth, Suffolk37 min
Aug 10, 6:46 PM EDTSpecial Weather StatementBOXBristol44 min
Aug 10, 7:45 PM EDTSpecial Marine WarningBOX30 min
Aug 10, 3:10 PM EDTSpecial Weather StatementBOXBristol, Kent, Newport, Washington50 min
Aug 10, 3:41 PM EDTSevere Thunderstorm WarningBOXWashington19 min
Aug 10, 4:09 PM EDTSevere Thunderstorm WarningBOXNewport, Washington36 min
Aug 10, 4:43 PM EDTSevere Thunderstorm WarningBOXBristol, Kent, Newport, Washington62 min
Aug 10, 4:56 PM EDTFlash Flood WarningBOXKent, Providence, Washington2 hr
Aug 10, 4:57 PM EDTFlash Flood WarningBOXKent, Providence, Washington2 hr

Nearby

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