Alert archive / Rhode Island / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 40, NWS Boston/Norton, MA

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

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 11, 2017, 9:49 AM EDT for Newport County, Rhode Island; Bristol County, Massachusetts. It was in force for 26 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, 9:49 AM EDT (13:49 UTC)
Expired: Jul 11, 2017, 10:15 AM EDT
In force: 26 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, Newport County, RI

The radar

The Boston radar (KBOX), 27 km from the middle of the area, began a volume at 13:51 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, 1.8 hours before the alert went out and 90 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.

477 
WUUS51 KBOX 111349
SVRBOX
MAC005-RIC005-111430-
/O.NEW.KBOX.SV.W.0040.170711T1349Z-170711T1430Z/

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

The National Weather Service in Taunton has issued a

* Severe Thunderstorm Warning for...
  Central Bristol County in southeastern Massachusetts...
  Northeastern Newport County in Rhode Island...

* Until 1030 AM EDT

* At 948 AM EDT, a severe thunderstorm was located near Somerset, or
  near 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...
  New Bedford, Fall River, Dartmouth, Bristol, Somerset, Portsmouth,
  Swansea, Tiverton, Westport, Warren, Acushnet, Freetown and
  Rochester.

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.

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

&&

LAT...LON 4160 7122 4165 7126 4167 7124 4170 7124
      4182 7104 4180 7102 4178 7102 4179 7092
      4176 7091 4176 7090 4171 7086 4170 7087
TIME...MOT...LOC 1348Z 238DEG 23KT 4169 7118 

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

Frank

1 follow-up statement

403 
WWUS51 KBOX 111415
SVSBOX

Severe Weather Statement
National Weather Service Taunton MA
1015 AM EDT TUE JUL 11 2017

MAC005-RIC005-111424-
/O.CAN.KBOX.SV.W.0040.000000T0000Z-170711T1430Z/
Bristol MA-Newport RI-
1015 AM EDT TUE JUL 11 2017

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL BRISTOL AND
NORTHEASTERN NEWPORT COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened and no longer 
poses an immediate threat to life or property.  Therefore the 
warning has been cancelled.  However heavy rain is still possible.

LAT...LON 4160 7122 4165 7126 4167 7124 4170 7124
      4182 7104 4180 7102 4178 7102 4179 7092
      4176 7091 4176 7090 4171 7086 4170 7087
TIME...MOT...LOC 1412Z 238DEG 23KT 4178 7099 

$$

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, 9:23 AM EDT	Severe Thunderstorm Warning	BOX	Bristol	37 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.