Alert archive / Connecticut / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 52, NWS Boston/Norton, MA

July 12, 2017Northeastern Connecticut Planning Region, Connecticut; Providence County, Rhode Island; Worcester County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 12, 2017, 5:21 PM EDT for Northeastern Connecticut Planning Region, Connecticut; Providence County, Rhode Island; Worcester County, Massachusetts. It was in force for 35 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 12, 2017, 5:21 PM EDT (21:21 UTC)
Expired: Jul 12, 2017, 5:56 PM EDT
In force: 35 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Northeastern Connecticut Planning Region, CT, Worcester County, MA, Providence County, RI

The radar

The Boston radar (KBOX), 65 km from the middle of the area, began a volume at 21:20 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 12, 5:30 PM EDT	TSTM WND DMG	1 W Dudley, MA	TWO LARGE TREES DOWN ON LEMPICKI ROAD

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, 9.4 hours before the alert went out and 149 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: 529 J/kg
Mixed-layer CIN: -143 J/kg
Mixed-layer LCL: 1143 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 112 m²/s²
0-3 km storm-relative helicity: 145 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

As transmitted.

039 
WUUS51 KBOX 122121
SVRBOX
CTC015-MAC027-RIC007-122215-
/O.NEW.KBOX.SV.W.0052.170712T2121Z-170712T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Taunton MA
521 PM EDT WED JUL 12 2017

The National Weather Service in Taunton has issued a

* Severe Thunderstorm Warning for...
  Northeastern Windham County in northern Connecticut...
  Southeastern Worcester County in central Massachusetts...
  Northwestern Providence County in Rhode Island...

* Until 615 PM EDT

* At 521 PM EDT, a severe thunderstorm was located over Dudley, or 18
  miles south of Worcester, moving east at 20 mph.

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

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is possible. Expect damage to 
           trees and power lines. 

* Locations impacted include...
  Killingly, Webster, Southbridge, Burrillville, Northbridge, Oxford,
  Uxbridge, Charlton, North Smithfield, Dudley, Scituate, Glocester,
  Putnam, Thompson, Sturbridge, Sutton, Douglas, Woodstock, Mendon
  and Millville.

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 4198 7210 4199 7210 4211 7205 4211 7154
      4184 7166
TIME...MOT...LOC 2121Z 279DEG 17KT 4202 7194 

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

DUNTEN

1 follow-up statement

310 
WWUS51 KBOX 122156
SVSBOX

Severe Weather Statement
National Weather Service Taunton MA
556 PM EDT WED JUL 12 2017

CTC015-MAC027-RIC007-122205-
/O.CAN.KBOX.SV.W.0052.000000T0000Z-170712T2215Z/
Windham CT-Worcester MA-Providence RI-
556 PM EDT WED JUL 12 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WINDHAM...
SOUTHEASTERN WORCESTER AND NORTHWESTERN PROVIDENCE 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 4198 7210 4199 7210 4211 7205 4211 7154
      4184 7166
TIME...MOT...LOC 2155Z 279DEG 17KT 4199 7172 

$$

DUNTEN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 10:15 AM EDT	Flash Flood Watch	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	11 hr
Jul 12, 12:53 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	67 min
Jul 12, 1:07 PM EDT	Areal Flood Advisory	BOX	Capitol Planning Region	53 min
Jul 12, 1:22 PM EDT	Severe Thunderstorm Warning	BOX		38 min
Jul 12, 1:57 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	41 min
Jul 12, 3:27 PM EDT	Severe Thunderstorm Warning	BOX	Northeastern Connecticut Planning Region	63 min
Jul 12, 3:47 PM EDT	Areal Flood Advisory	BOX	Northeastern Connecticut Planning Region	58 min
Jul 12, 4:26 PM EDT	Flash Flood Warning	BOX	Northeastern Connecticut Planning Region	2 hr
Jul 12, 5:01 PM EDT	Special Weather Statement	BOX		44 min
Jul 12, 5:19 PM EDT	Areal Flood Advisory	BOX	Northeastern Connecticut Planning Region	56 min
Jul 12, 5:36 PM EDT	Flash Flood Warning	BOX	Northeastern Connecticut Planning Region	114 min
Jul 12, 5:43 PM EDT	Special Weather Statement	BOX		47 min
Jul 12, 12:34 PM EDT	Special Weather Statement	BOX	Bristol	41 min
Jul 12, 2:32 PM EDT	Special Weather Statement	BOX	Providence	43 min
Jul 12, 2:53 PM EDT	Flash Flood Warning	BOX	Providence	112 min
Jul 12, 3:03 PM EDT	Special Weather Statement	BOX	Providence	42 min
Jul 12, 3:10 PM EDT	Severe Thunderstorm Warning	BOX	Providence	50 min
Jul 12, 3:26 PM EDT	Flash Flood Warning	BOX	Bristol, Newport, Providence	2 hr
Jul 12, 3:44 PM EDT	Severe Thunderstorm Warning	BOX	Providence	35 min
Jul 12, 4:26 PM EDT	Special Weather Statement	BOX	Kent	49 min
Jul 12, 4:38 PM EDT	Severe Thunderstorm Warning	BOX	Kent, Washington	31 min
Jul 12, 11:01 AM EDT	Special Weather Statement	BOX	Suffolk	29 min
Jul 12, 12:01 PM EDT	Special Weather Statement	BOX	Franklin	44 min
Jul 12, 12:05 PM EDT	Special Weather Statement	BOX	Worcester	40 min
Jul 12, 12:24 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Norfolk, Worcester	51 min
Jul 12, 12:25 PM EDT	Areal Flood Advisory	BOX	Franklin	65 min
Jul 12, 12:36 PM EDT	Special Weather Statement	BOX	Hampden	39 min
Jul 12, 12:44 PM EDT	Areal Flood Advisory	BOX	Middlesex, Norfolk, Worcester	61 min
Jul 12, 12:46 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Norfolk	44 min
Jul 12, 12:50 PM EDT	Special Weather Statement	BOX	Middlesex	40 min
Jul 12, 1:19 PM EDT	Areal Flood Advisory	BOX	Hampden	56 min
Jul 12, 1:39 PM EDT	Special Weather Statement	BOX	Worcester	51 min
Jul 12, 1:39 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Norfolk, Plymouth	51 min
Jul 12, 1:41 PM EDT	Special Weather Statement	BOX	Middlesex	49 min
Jul 12, 1:47 PM EDT	Special Weather Statement	BOX	Hampden	43 min
Jul 12, 1:52 PM EDT	Areal Flood Advisory	BOX	Bristol, Norfolk, Plymouth	53 min
Jul 12, 2:35 PM EDT	Areal Flood Advisory	BOX	Bristol, Plymouth	55 min
Jul 12, 3:04 PM EDT	Areal Flood Advisory	BOX	Middlesex, Norfolk, Worcester	56 min
Jul 12, 3:36 PM EDT	Special Weather Statement	BOX	Hampshire	39 min
Jul 12, 3:53 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Plymouth	34 min
Jul 12, 4:01 PM EDT	Special Weather Statement	BOX	Hampden	44 min
Jul 12, 4:06 PM EDT	Areal Flood Advisory	BOX	Bristol, Plymouth	114 min
Jul 12, 4:16 PM EDT	Special Weather Statement	BOX	Plymouth	44 min
Jul 12, 4:18 PM EDT	Areal Flood Advisory	BOX	Norfolk, Plymouth, Suffolk	57 min
Jul 12, 4:24 PM EDT	Special Marine Warning	BOX		66 min
Jul 12, 4:32 PM EDT	Special Marine Warning	BOX		58 min
Jul 12, 4:36 PM EDT	Areal Flood Advisory	BOX	Franklin, Hampden, Hampshire	114 min
Jul 12, 4:39 PM EDT	Special Marine Warning	BOX		66 min
Jul 12, 4:48 PM EDT	Special Weather Statement	BOX	Middlesex	42 min
Jul 12, 4:53 PM EDT	Flash Flood Warning	BOX	Hampden, Hampshire	112 min
Jul 12, 5:00 PM EDT	Areal Flood Advisory	BOX	Essex, Middlesex	60 min
Jul 12, 5:36 PM EDT	Special Weather Statement	BOX	Middlesex	39 min
Jul 12, 5:42 PM EDT	Flash Flood Warning	BOX	Middlesex	2 hr
Jul 12, 6:10 PM EDT	Special Weather Statement	BOX	Middlesex	35 min
Jul 12, 6:20 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Norfolk, Suffolk	25 min
Jul 12, 6:29 PM EDT	Flash Flood Warning	BOX	Middlesex, Norfolk, Suffolk	2 hr
Jul 12, 6:39 PM EDT	Special Weather Statement	BOX	Norfolk	36 min
Jul 12, 7:05 PM EDT	Special Weather Statement	BOX	Suffolk	25 min
Jul 12, 7:35 PM EDT	Areal Flood Warning	BOX	Middlesex	115 min

Nearby

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