Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 2, NWS Boston/Norton, MA

May 4, 2018Franklin County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at May 4, 2018, 5:54 PM EDT for Franklin County, Massachusetts. It was in force for 18 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: May 4, 2018, 5:54 PM EDT (21:54 UTC)
Expired: May 4, 2018, 6:12 PM EDT
In force: 18 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Franklin County, MA

The radar

The Albany radar (KENX), 94 km from the middle of the area, began a volume at 21:55 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

Albany, NY (KALY), launched 12:00Z, 9.9 hours before the alert went out and 75 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: 812 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 147 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

525 
WUUS51 KBOX 042154
SVRBOX
MAC011-042300-
/O.NEW.KBOX.SV.W.0002.180504T2154Z-180504T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
554 PM EDT FRI MAY 4 2018

The National Weather Service in Boston/Norton has issued a

* Severe Thunderstorm Warning for...
  Northwestern Franklin County in western Massachusetts...

* Until 700 PM EDT.

* At 553 PM EDT, a severe thunderstorm was located over Hawley, or 10
  miles southeast of North Adams, moving northeast at 65 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Northfield, Bernardston, Buckland, Shelburne, Colrain, Charlemont,
  Leyden, Heath, Rowe, Hawley and Hoosac Tunnel.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 4269 7296 4270 7295 4271 7295 4274 7288
      4272 7248 4255 7292 4258 7297 4263 7295
      4266 7295 4267 7296 4266 7298 4267 7300
TIME...MOT...LOC 2153Z 237DEG 55KT 4262 7292 

HAIL...0.75IN
WIND...60MPH
 
$$

md

1 follow-up statement

187 
WWUS51 KBOX 042212
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
612 PM EDT FRI MAY 4 2018

MAC011-042221-
/O.CAN.KBOX.SV.W.0002.000000T0000Z-180504T2300Z/
Franklin MA-
612 PM EDT FRI MAY 4 2018

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN FRANKLIN COUNTY
IS CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

LAT...LON 4269 7296 4270 7295 4271 7295 4274 7288
      4272 7248 4255 7292 4258 7297 4263 7295
      4266 7295 4267 7296 4266 7298 4267 7300
TIME...MOT...LOC 2209Z 237DEG 55KT 4277 7260 

$$

md

The office that day

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

Issued	Product	Office	Counties	Lasted
May 3, 9:46 PM EDT	Small Craft Advisory	BOX		51 hr
May 4, 3:38 AM EDT	Wind Advisory	BOX	Essex, Franklin, Hampden, Hampshire, Middlesex, Norfolk and 2 more	27 hr
May 4, 3:24 PM EDT	Gale Warning	BOX		15 hr
May 4, 5:45 PM EDT	Special Weather Statement	BOX	Franklin	30 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2018 Every severe thunderstorm warning 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.