Alert archive / Rhode Island / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 84, NWS Boston/Norton, MA

July 17, 2021Bristol County, Kent County, Providence County, Rhode Island; Bristol County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 17, 2021, 6:05 PM EDT for Bristol County, Kent County, Providence County, Rhode Island; Bristol County, Massachusetts. It was in force for 26 min. 1 report 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: Jul 17, 2021, 6:05 PM EDT (22:05 UTC)
Expired: Jul 17, 2021, 6:31 PM EDT
In force: 26 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

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

The radar

The Boston radar (KBOX), 20 km from the middle of the area, began a volume at 22:07 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
Jul 17, 6:11 PM EDT	TSTM WND DMG	Seekonk, MA	TREE DOWN ON ARCADE AVE NEAR VALLEY STREET

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, 10.1 hours before the alert went out and 171 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: 1203 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 1054 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 46 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

As transmitted.

316 
WUUS51 KBOX 172205
SVRBOX
MAC005-RIC001-003-007-172300-
/O.NEW.KBOX.SV.W.0084.210717T2205Z-210717T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
605 PM EDT Sat Jul 17 2021

The National Weather Service in Boston/Norton has issued a

* Severe Thunderstorm Warning for...
  Central Bristol County in southeastern Massachusetts...
  Northeastern Kent County in Rhode Island...
  Southeastern Providence County in Rhode Island...
  Northern Bristol County in Rhode Island...

* Until 700 PM EDT.

* At 604 PM EDT, a severe thunderstorm was located over East
  Providence, moving east at 15 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Expect wind damage to trees and power lines. Minor hail 
           damage to vehicles is possible.

* Locations impacted include...
  Providence, Fall River, Warwick, Cranston, Pawtucket, Taunton, East
  Providence, North Providence, Attleboro, Norton, Somerset,
  Barrington, Swansea, Seekonk, Raynham, Rehoboth, Warren, Lakeville,
  Freetown and Dighton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4174 7142 4187 7143 4198 7106 4195 7103
      4183 7101 4181 7103 4174 7100 4174 7113
      4177 7111 4179 7112 4174 7114 4174 7128
      4176 7128 4174 7129 4173 7132 4175 7136
      4179 7137 4178 7139 4174 7138
TIME...MOT...LOC 2204Z 256DEG 13KT 4181 7136 

HAIL...1.00IN
WIND...60MPH
 
$$

Chai

1 follow-up statement

817 
WWUS51 KBOX 172231
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
631 PM EDT Sat Jul 17 2021

MAC005-RIC001-003-007-172241-
/O.CAN.KBOX.SV.W.0084.000000T0000Z-210717T2300Z/
Bristol MA-Kent RI-Providence RI-Bristol RI-
631 PM EDT Sat Jul 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL BRISTOL...NORTHEASTERN
KENT...SOUTHEASTERN PROVIDENCE AND NORTHERN BRISTOL COUNTIES IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.  However heavy rain is
still possible with this thunderstorm.

LAT...LON 4174 7142 4187 7143 4198 7106 4195 7103
      4183 7101 4181 7103 4174 7100 4174 7113
      4177 7111 4179 7112 4174 7114 4174 7128
      4176 7128 4174 7129 4173 7132 4175 7136
      4179 7137 4178 7139 4174 7138
TIME...MOT...LOC 2229Z 256DEG 13KT 4183 7123 

$$

Chai

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 2:14 PM EDT	Special Weather Statement	BOX	Bristol	46 min
Jul 17, 2:39 PM EDT	Areal Flood Warning	BOX	Kent, Providence	111 min
Jul 17, 2:46 PM EDT	Special Weather Statement	BOX	Providence	44 min
Jul 17, 2:53 PM EDT	Severe Thunderstorm Warning	BOX	Providence	52 min
Jul 17, 3:26 PM EDT	Severe Thunderstorm Warning	BOX	Providence	64 min
Jul 17, 3:36 PM EDT	Areal Flood Warning	BOX	Kent, Providence	114 min
Jul 17, 4:06 PM EDT	Flash Flood Warning	BOX	Kent, Providence	4 hr
Jul 17, 4:29 PM EDT	Severe Thunderstorm Warning	BOX	Kent, Providence	61 min
Jul 17, 5:30 PM EDT	Flash Flood Warning	BOX	Providence	3 hr
Jul 17, 5:49 PM EDT	Special Weather Statement	BOX	Bristol	41 min
Jul 17, 2:37 PM EDT	Special Weather Statement	BOX	Franklin	38 min
Jul 17, 2:45 PM EDT	Special Weather Statement	BOX	Plymouth	45 min
Jul 17, 2:53 PM EDT	Special Weather Statement	BOX	Hampshire	52 min
Jul 17, 4:05 PM EDT	Severe Thunderstorm Warning	BOX	Worcester	34 min
Jul 17, 4:15 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Worcester	60 min
Jul 17, 4:34 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	36 min
Jul 17, 4:38 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Hampshire	67 min
Jul 17, 4:48 PM EDT	Flash Flood Warning	BOX	Worcester	3 hr
Jul 17, 4:58 PM EDT	Flash Flood Warning	BOX	Hampden	2 hr
Jul 17, 5:10 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	65 min
Jul 17, 5:34 PM EDT	Special Weather Statement	BOX	Hampshire	41 min
Jul 17, 5:35 PM EDT	Flash Flood Warning	BOX	Hampden, Hampshire	3 hr
Jul 17, 6:04 PM EDT	Flash Flood Warning	BOX	Hampden, Hampshire	3 hr
Jul 17, 7:49 PM EDT	Areal Flood Warning	BOX	Hampden, Worcester	116 min

Nearby

Severe Thunderstorm Warnings in Rhode Island, 2021 Severe Thunderstorm Warnings in Massachusetts, 2021 Every severe thunderstorm warning in 2021

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.