Alert archive / Rhode Island / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 39, NWS Boston/Norton, MA

July 11, 2017Bristol County, Rhode Island; Bristol County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 11, 2017, 9:23 AM EDT for Bristol County, Rhode Island; Bristol County, Massachusetts. It was in force for 37 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 11, 2017, 9:23 AM EDT (13:23 UTC)
Expired: Jul 11, 2017, 10:00 AM EDT
In force: 37 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Bristol County, MA, Bristol County, RI

The radar

The Boston radar (KBOX), 36 km from the middle of the area, began a volume at 13:23 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, 1.4 hours before the alert went out and 114 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 798 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 124 m²/s²
0-3 km storm-relative helicity: 144 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

533 
WUUS51 KBOX 111323
SVRBOX
MAC005-RIC001-111400-
/O.NEW.KBOX.SV.W.0039.170711T1323Z-170711T1400Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Taunton MA
923 AM EDT TUE JUL 11 2017

The National Weather Service in Taunton has issued a

* Severe Thunderstorm Warning for...
  West central Bristol County in southeastern Massachusetts...
  Bristol County in Rhode Island...

* Until 1000 AM EDT

* At 923 AM EDT, a severe thunderstorm was located near Warwick,
  moving northeast at 25 mph.

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to trees and power lines. 

* Locations impacted include...
  Fall River, Warwick, Bristol, Somerset, Barrington, Swansea,
  Tiverton, Rehoboth, Warren and Prudence Island.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

&&

LAT...LON 4165 7142 4166 7141 4166 7145 4170 7138
      4167 7137 4172 7136 4167 7135 4166 7132
      4169 7131 4172 7135 4180 7123 4170 7111
      4163 7127 4162 7130 4163 7133 4161 7133
      4159 7137
TIME...MOT...LOC 1323Z 237DEG 23KT 4164 7138 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

Frank

1 follow-up statement

837 
WWUS51 KBOX 111346
SVSBOX

Severe Weather Statement
National Weather Service Taunton MA
946 AM EDT TUE JUL 11 2017

MAC005-RIC001-111400-
/O.CON.KBOX.SV.W.0039.000000T0000Z-170711T1400Z/
Bristol MA-Bristol RI-
946 AM EDT TUE JUL 11 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 AM EDT
FOR CENTRAL BRISTOL AND SOUTHEASTERN BRISTOL COUNTIES...

At 945 AM EDT, a severe thunderstorm was located over Bristol, moving
northeast at 25 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to trees and power lines. 

Locations impacted include...
Fall River, Warwick, Bristol, Somerset, Swansea and Prudence Island. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4161 7138 4162 7135 4165 7138 4161 7139
      4162 7140 4166 7141 4166 7144 4170 7139
      4167 7138 4172 7136 4167 7135 4167 7127
      4175 7116 4170 7111 4168 7120 4162 7129
      4163 7133 4161 7133 4159 7137
TIME...MOT...LOC 1345Z 238DEG 23KT 4167 7123 

HAIL...<.75IN
WIND...60MPH
 
$$

Frank

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 6:22 AM EDT	Special Weather Statement	BOX	Providence	38 min
Jul 11, 6:35 AM EDT	Areal Flood Warning	BOX	Providence	115 min
Jul 11, 8:22 AM EDT	Special Weather Statement	BOX	Bristol, Kent	53 min
Jul 11, 8:55 AM EDT	Areal Flood Warning	BOX	Bristol, Kent, Providence	2 hr
Jul 11, 9:49 AM EDT	Severe Thunderstorm Warning	BOX	Newport	26 min
Jul 11, 7:12 AM EDT	Special Weather Statement	BOX	Plymouth	93 min
Jul 11, 9:13 AM EDT	Special Marine Warning	BOX		62 min

Nearby

Severe Thunderstorm Warnings in Rhode Island, 2017 Severe Thunderstorm Warnings in Massachusetts, 2017 Every severe thunderstorm warning in 2017

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.