Alert archive / Connecticut / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 21, NWS Boston/Norton, MA

July 16, 2023Capitol Planning Region, Connecticut

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 16, 2023, 9:15 AM EDT for Capitol Planning Region, Connecticut. It was in force for 45 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 16, 2023, 9:15 AM EDT (13:15 UTC)
Expired: Jul 16, 2023, 10:00 AM EDT
In force: 45 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

County Capitol Planning Region, CT

The radar

The Brookhaven radar (KOKX), 115 km from the middle of the area, began a volume at 13:19 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 16, 8:21 AM EDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 1.3 hours before the alert went out and 115 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: 236 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 766 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 193 m²/s²
0-3 km storm-relative helicity: 223 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 6.0

Open this sounding in Storm Lab

The text

As transmitted.

458 
WUUS51 KBOX 161315
SVRBOX
CTC003-161400-
/O.NEW.KBOX.SV.W.0021.230716T1315Z-230716T1400Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
915 AM EDT Sun Jul 16 2023

The National Weather Service in Boston/Norton has issued a

* Severe Thunderstorm Warning for...
  Central Hartford County in northern Connecticut...

* Until 1000 AM EDT.

* At 915 AM EDT, a severe thunderstorm was located over Plainville,
  or near Farmington, moving northeast at 30 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Hartford, New Britain, West Hartford, Bristol, East Hartford,
  Enfield, Southington, Newington, Windsor, Wethersfield, South
  Windsor, Farmington, Simsbury, Bloomfield, Berlin, Avon,
  Plainville, Suffield, Ellington and Windsor Locks.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 300 PM EDT for northern
Connecticut.

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.

A Tornado Watch remains in effect until 300 PM EDT for northern
Connecticut.

&&

LAT...LON 4201 7274 4195 7249 4195 7250 4194 7251
      4191 7251 4190 7252 4160 7279 4168 7298
TIME...MOT...LOC 1315Z 213DEG 27KT 4169 7287 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

KC

1 follow-up statement

609 
WWUS51 KBOX 161356
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
956 AM EDT Sun Jul 16 2023

CTC003-161406-
/O.EXP.KBOX.SV.W.0021.000000T0000Z-230716T1400Z/
Hartford CT-
956 AM EDT Sun Jul 16 2023

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL HARTFORD COUNTY WILL
EXPIRE AT 1000 AM EDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.

A Tornado Watch remains in effect until 300 PM EDT for northern
Connecticut.

LAT...LON 4201 7274 4195 7249 4195 7250 4194 7251
      4191 7251 4190 7252 4160 7279 4168 7298
TIME...MOT...LOC 1356Z 213DEG 27KT 4191 7268 

$$

KC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 8:54 AM EDT	Special Weather Statement	BOX		51 min
Jul 16, 9:23 AM EDT	Flash Flood Warning	BOX	Capitol Planning Region	3 hr
Jul 16, 9:51 AM EDT	Special Weather Statement	BOX		54 min
Jul 16, 10:16 AM EDT	Severe Thunderstorm Warning	BOX	Northeastern Connecticut Planning Region	44 min
Jul 16, 10:49 AM EDT	Flash Flood Warning	BOX	Northeastern Connecticut Planning Region	3 hr
Jul 16, 11:43 AM EDT	Special Weather Statement	BOX		47 min
Jul 16, 1:36 PM EDT	Flash Flood Warning	BOX	Northeastern Connecticut Planning Region	6 hr
Jul 16, 3:40 PM EDT	River Flood Warning	BOX	Capitol Planning Region	11 hr
Jul 16, 4:02 PM EDT	Areal Flood Warning	BOX	Northeastern Connecticut Planning Region	3 hr
Jul 16, 7:51 PM EDT	River Flood Warning	BOX	Capitol Planning Region	25 hr
Jul 16, 7:51 PM EDT	River Flood Warning	BOX	Capitol Planning Region	36 hr

Nearby

Severe Thunderstorm Warnings in Connecticut, 2023 Every severe thunderstorm warning in 2023

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.