Alert archive / Rhode Island / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 76, NWS Boston/Norton, MA

September 6, 20175 counties in Rhode Island; Northeastern Connecticut Planning Region, Connecticut; Bristol County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Sep 6, 2017, 10:04 AM EDT for 5 counties in Rhode Island; Northeastern Connecticut Planning Region, Connecticut; Bristol County, Massachusetts. It was in force for 41 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Sep 6, 2017, 10:04 AM EDT (14:04 UTC)
Expired: Sep 6, 2017, 10:45 AM EDT
In force: 41 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Northeastern Connecticut Planning Region, CT, Bristol County, MA, Bristol County, RI, Kent County, RI, Newport County, RI, Providence County, RI, Washington County, RI

The radar

The Boston radar (KBOX), 70 km from the middle of the area, began a volume at 14:06 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.

What was reported inside it

Time	Report	Where	Remark
Sep 6, 10:08 AM EDT	TSTM WND DMG	Westerly, RI	WIRES DOWN ON MAIN STREET
Sep 6, 10:30 AM EDT	TSTM WND DMG	1 Wsw Cowesett, RI	LARGE TREE AND WIRES DOWN ARE DOWN BLOCKING MAJOR POTTER ROAD
Sep 6, 10:30 AM EDT	TSTM WND DMG	Warwick, RI	TREE DOWN ON HOUSE ON TIDEWATER DRIVER

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 2.1 hours before the alert went out and 125 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: 497 J/kg
Mixed-layer CIN: -71 J/kg
Mixed-layer LCL: 832 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 132 m²/s²
0-3 km storm-relative helicity: 178 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

As transmitted.

333 
WUUS51 KBOX 061404
SVRBOX
CTC015-MAC005-RIC001-003-005-007-009-061445-
/O.NEW.KBOX.SV.W.0076.170906T1404Z-170906T1445Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Taunton MA
1004 AM EDT WED SEP 6 2017

The National Weather Service in Taunton has issued a

* Severe Thunderstorm Warning for...
  Southeastern Windham County in northern Connecticut...
  Southwestern Bristol County in southeastern Massachusetts...
  Washington County in Rhode Island...
  Newport County in Rhode Island...
  Kent County in Rhode Island...
  Southeastern Providence County in Rhode Island...
  Bristol County in Rhode Island...

* Until 1045 AM EDT

* At 1003 AM EDT, severe thunderstorms were located along a line
  extending from Sprague to Block Island, moving northeast at 55 mph.

  HAZARD...60 mph wind gusts and penny size hail. 

  SOURCE...Radar indicated. 

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

* Locations impacted include...
  Providence, Fall River, Warwick, Cranston, Pawtucket, East
  Providence, Coventry, Dartmouth, North Providence, South Kingstown,
  West Warwick, Johnston, North Kingstown, Newport, Bristol,
  Plainfield, Block Island, Westerly, Smithfield and Lincoln.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4120 7158 4135 7162 4129 7187 4133 7190
      4133 7184 4141 7184 4142 7180 4164 7179
      4164 7195 4198 7151 4158 7101 4145 7120
      4149 7122 4146 7123 4144 7130 4144 7141
      4135 7148 4134 7161 4123 7158 4122 7155
TIME...MOT...LOC 1403Z 217DEG 48KT 4164 7208 4122 7155 

HAIL...0.75IN
WIND...60MPH
 
$$

LEC

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 6, 9:57 AM EDT	Special Weather Statement	BOX	Washington	33 min
Sep 6, 10:42 AM EDT	Severe Thunderstorm Warning	BOX	Bristol, Newport, Providence	33 min
Sep 6, 10:45 AM EDT	Areal Flood Advisory	BOX	Bristol	60 min
Sep 5, 8:31 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	44 min
Sep 6, 9:30 AM EDT	Special Weather Statement	BOX	Essex	30 min
Sep 6, 9:45 AM EDT	Small Craft Advisory	BOX		25 hr
Sep 6, 10:00 AM EDT	Special Marine Warning	BOX		45 min
Sep 6, 10:16 AM EDT	Special Marine Warning	BOX		44 min
Sep 6, 11:08 AM EDT	Special Marine Warning	BOX		37 min
Sep 6, 11:10 AM EDT	Severe Thunderstorm Warning	BOX	Norfolk, Plymouth	35 min
Sep 6, 11:33 AM EDT	Special Weather Statement	BOX	Dukes	27 min
Sep 6, 11:44 AM EDT	Special Marine Warning	BOX		46 min
Sep 6, 11:46 AM EDT	Severe Thunderstorm Warning	BOX	Essex	29 min
Sep 6, 11:50 AM EDT	Special Weather Statement	BOX	Barnstable	25 min
Sep 6, 12:01 PM EDT	Special Marine Warning	BOX		59 min
Sep 6, 12:07 PM EDT	Special Weather Statement	BOX	Barnstable	38 min
Sep 6, 12:35 PM EDT	Special Weather Statement	BOX	Barnstable	25 min
Sep 6, 1:11 PM EDT	Special Weather Statement	BOX	Dukes	64 min
Sep 6, 1:39 PM EDT	Areal Flood Warning	BOX	Barnstable	111 min
Sep 6, 4:10 PM EDT	Special Marine Warning	BOX		65 min

Nearby

Severe Thunderstorm Warnings in Rhode Island, 2017 Severe Thunderstorm Warnings in Connecticut, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.