Alert archive / Connecticut / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 82, NWS Boston/Norton, MA

August 11, 2016

NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 11, 2016, 2:19 PM EDT. It was in force for 43 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: Aug 11, 2016, 2:19 PM EDT (18:19 UTC)
Expired: Aug 11, 2016, 3:02 PM EDT
In force: 43 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

The radar

The Boston radar (KBOX), 108 km from the middle of the area, began a volume at 18:22 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

Brookhaven, NY (KOKX), launched 12:00Z, 6.3 hours before the alert went out and 123 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: 1804 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 802 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 114 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

350 
WUUS51 KBOX 111819
SVRBOX
CTC013-111915-
/O.NEW.KBOX.SV.W.0082.160811T1819Z-160811T1915Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
219 PM EDT THU AUG 11 2016

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN TOLLAND COUNTY IN NORTHERN CONNECTICUT...

* UNTIL 315 PM EDT

* AT 217 PM EDT...A SEVERE THUNDERSTORM WAS LOCATED OVER ENFIELD...
  MOVING SOUTHEAST AT 15 MPH.

  HAZARD...60 MPH WIND GUSTS AND QUARTER SIZE HAIL. TORRENTIAL RAIN. 

  SOURCE...RADAR INDICATED. 

  IMPACT...HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE 
           TO TREES AND POWER LINES. LOCALIZED STREET FLOODING.

* LOCATIONS IMPACTED INCLUDE...
  VERNON...MANSFIELD...ELLINGTON...TOLLAND...COVENTRY...STAFFORD...
  SOMERS...WILLINGTON AND UNION.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING. DO NOT DRIVE THROUGH FLOODED AREAS.

&&

LAT...LON 4191 7251 4194 7251 4195 7249 4201 7250
      4199 7220 4178 7231 4190 7252
TIME...MOT...LOC 1817Z 295DEG 15KT 4198 7256 

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

2 follow-up statements

299 
WWUS51 KBOX 111845
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
245 PM EDT THU AUG 11 2016

CTC013-111915-
/O.CON.KBOX.SV.W.0082.000000T0000Z-160811T1915Z/
TOLLAND CT-
245 PM EDT THU AUG 11 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR NORTHWESTERN TOLLAND COUNTY...

AT 243 PM EDT...A POTENTIALLY SEVERE THUNDERSTORM WAS LOCATED OVER
ELLINGTON...OR NEAR VERNON...MOVING SOUTHEAST AT 20 MPH. THE STORM
HAD WEAKENED BUT STILL WAS CAPABLE OF PRODUCING LOCALIZED LARGE HAIL
AND DAMAGING WIND GUSTS.

HAZARD...POSSIBLE 60 MPH WIND GUSTS AND QUARTER SIZE HAIL. 

SOURCE...RADAR INDICATED. 

IMPACT...TREES AND WIRES MAY BE DOWNED. POSSIBLE HAIL DAMAGE TO
         CROPS. 

LOCATIONS IMPACTED INCLUDE...
VERNON...MANSFIELD...ELLINGTON...TOLLAND...COVENTRY...STAFFORD...
SOMERS AND WILLINGTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4190 7251 4199 7245 4194 7223 4178 7231
      4183 7240
TIME...MOT...LOC 1843Z 303DEG 19KT 4191 7244 

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

572 
WWUS51 KBOX 111902
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
302 PM EDT THU AUG 11 2016

CTC013-111912-
/O.CAN.KBOX.SV.W.0082.000000T0000Z-160811T1915Z/
TOLLAND CT-
302 PM EDT THU AUG 11 2016

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN TOLLAND COUNTY 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 FOR TOLLAND COUNTY HAS BEEN CANCELLED.

LAT...LON 4190 7251 4199 7245 4194 7223 4178 7231
      4183 7240
TIME...MOT...LOC 1901Z 295DEG 15KT 4188 7234 

$$
FIELD

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 1:47 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	58 min
Aug 11, 3:44 PM EDT	Heat Advisory	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	27 hr
Aug 11, 3:59 PM EDT	Areal Flood Advisory	BOX	Capitol Planning Region	46 min
Aug 11, 4:15 PM EDT	Severe Thunderstorm Warning	BOX	Northeastern Connecticut Planning Region	60 min
Aug 11, 4:22 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	38 min
Aug 11, 4:34 PM EDT	Areal Flood Warning	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	116 min
Aug 11, 4:41 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	49 min
Aug 11, 5:29 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	61 min
Aug 11, 5:51 PM EDT	Areal Flood Advisory	BOX	Capitol Planning Region	114 min
Aug 11, 6:15 PM EDT	Flash Flood Warning	BOX	Capitol Planning Region	2 hr
Aug 11, 6:19 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	56 min

Nearby

Severe Thunderstorm Warnings in Connecticut, 2016 Every severe thunderstorm warning in 2016

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.