Alert archive / Connecticut / Tornado Warnings in 2018

Tornado Warning 1, NWS Boston/Norton, MA

May 15, 2018Capitol Planning Region, Connecticut

NWS Boston/Norton, MA issued this tornado warning at May 15, 2018, 3:36 PM EDT for Capitol Planning Region, Connecticut. It was in force for 24 min. 3 reports 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: May 15, 2018, 3:36 PM EDT (19:36 UTC)
Expired: May 15, 2018, 4:00 PM EDT
In force: 24 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.5 in

County Capitol Planning Region, CT

The radar

The Albany radar (KENX), 121 km from the middle of the area, began a volume at 19:40 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
May 15, 4:00 PM EDT	HAIL 1	East Hartland, CT
May 15, 4:00 PM EDT	HAIL 1.75	Hartland, CT
May 15, 4:06 PM EDT	HAIL 2	East Hartland, CT

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

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

Issued	Product	Office	Lasted
May 15, 2:23 PM EDT	Tornado Watch	SPC	4 hr

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 7.6 hours before the alert went out and 113 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: 932 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 103 m²/s²
0-3 km storm-relative helicity: 259 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

116 
WFUS51 KBOX 151936
TORBOX
CTC003-152000-
/O.NEW.KBOX.TO.W.0001.180515T1936Z-180515T2000Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Boston/Norton MA
336 PM EDT TUE MAY 15 2018

The National Weather Service in Boston/Norton has issued a

* Tornado Warning for...
  Northwestern Hartford County in northern Connecticut...

* Until 400 PM EDT.
    
* At 335 PM EDT, a severe thunderstorm capable of producing a tornado
  was located over Norfolk, or 9 miles north of Torrington, moving
  east at 40 mph.

  HAZARD...Tornado and ping pong ball size hail.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur. Tree 
           damage is likely.

* This dangerous storm will be near...
  Hartland around 350 PM EDT.
  Simsbury, Granby, Canton and East Granby around 400 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4204 7301 4203 7281 4200 7281 4200 7277
      4203 7275 4203 7268 4175 7271 4183 7294
      4188 7295 4190 7291 4197 7289 4197 7303
TIME...MOT...LOC 1935Z 278DEG 36KT 4197 7315 

TORNADO...RADAR INDICATED
HAIL...1.50IN

$$

Sipprell

The office that day

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

Issued	Product	Office	Counties	Lasted
May 15, 3:06 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	54 min
May 15, 3:46 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region	59 min
May 15, 4:02 PM EDT	Tornado Warning	BOX	Capitol Planning Region	28 min
May 15, 4:42 PM EDT	Severe Thunderstorm Warning	BOX	Capitol Planning Region, Northeastern Connecticut Planning Region	63 min
May 15, 5:31 PM EDT	Special Weather Statement	BOX		59 min
May 15, 5:48 PM EDT	Severe Thunderstorm Warning	BOX	Northeastern Connecticut Planning Region	27 min

Nearby

Tornado Warnings in Connecticut, 2018 Every tornado warning in 2018 Tornadoes in 2018

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.