Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 49, NWS Boston/Norton, MA

August 3, 2018Middlesex County, Worcester County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 3, 2018, 6:27 PM EDT for Middlesex County, Worcester County, Massachusetts. It was in force for 48 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 3, 2018, 6:27 PM EDT (22:27 UTC)
Expired: Aug 3, 2018, 7:15 PM EDT
In force: 48 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Middlesex County, MA, Worcester County, MA

The radar

The Boston radar (KBOX), 89 km from the middle of the area, began a volume at 22:26 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, 10.5 hours before the alert went out and 162 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: 98 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 716 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 54 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

376 
WUUS51 KBOX 032227
SVRBOX
MAC017-027-032315-
/O.NEW.KBOX.SV.W.0049.180803T2227Z-180803T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
627 PM EDT FRI AUG 3 2018

The National Weather Service in Boston/Norton has issued a

* Severe Thunderstorm Warning for...
  Northwestern Worcester County in central Massachusetts...
  Northwestern Middlesex County in northeastern Massachusetts...

* Until 715 PM EDT.

* At 627 PM EDT, a severe thunderstorm was located over Barre, or 13
  miles southeast of Orange, moving northeast at 30 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Nashua, Leominster, Fitchburg, Gardner, Pepperell, Tyngsborough,
  Groton, Winchendon, Lunenburg, Townsend, Lancaster, Templeton,
  Rutland, Sterling, Hollis, Westminster, Shirley, Ashburnham, Barre
  and Hubbardston.

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 4270 7141 4241 7189 4235 7217 4248 7229
      4272 7196
TIME...MOT...LOC 2227Z 221DEG 25KT 4244 7213 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

Sipprell

1 follow-up statement

858 
WWUS51 KBOX 032311
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
711 PM EDT FRI AUG 3 2018

MAC017-027-032321-
/O.EXP.KBOX.SV.W.0049.000000T0000Z-180803T2315Z/
Worcester MA-Middlesex MA-
711 PM EDT FRI AUG 3 2018

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN WORCESTER AND
NORTHWESTERN MIDDLESEX COUNTIES WILL EXPIRE AT 715 PM 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.  However heavy rain is still possible with this
thunderstorm.

LAT...LON 4270 7141 4241 7189 4235 7217 4248 7229
      4272 7196
TIME...MOT...LOC 2311Z 221DEG 25KT 4267 7186 

$$

Frank

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 3, 3:30 AM EDT	Heat Advisory	BOX	Bristol, Essex, Middlesex, Norfolk, Plymouth, Suffolk	15 hr
Aug 3, 12:56 PM EDT	Special Weather Statement	BOX	Worcester	34 min
Aug 3, 1:02 PM EDT	Special Weather Statement	BOX	Worcester	28 min
Aug 3, 1:07 PM EDT	Severe Thunderstorm Warning	BOX	Worcester	23 min
Aug 3, 1:11 PM EDT	Special Weather Statement	BOX	Norfolk	34 min
Aug 3, 1:43 PM EDT	Areal Flood Advisory	BOX	Suffolk	62 min
Aug 3, 1:47 PM EDT	Special Weather Statement	BOX	Norfolk, Suffolk	43 min
Aug 3, 1:53 PM EDT	Special Marine Warning	BOX		42 min
Aug 3, 2:41 PM EDT	Flash Flood Watch	BOX	Bristol, Essex, Franklin, Hampden, Hampshire, Middlesex and 3 more	25 hr
Aug 3, 2:58 PM EDT	Special Weather Statement	BOX	Franklin	47 min
Aug 3, 3:05 PM EDT	Special Marine Warning	BOX		25 min
Aug 3, 3:35 PM EDT	Small Craft Advisory	BOX		32 hr
Aug 3, 3:59 PM EDT	Special Weather Statement	BOX	Franklin	46 min
Aug 3, 5:08 PM EDT	Flash Flood Warning	BOX	Franklin, Hampden, Hampshire	112 min
Aug 3, 5:14 PM EDT	Special Weather Statement	BOX	Franklin	31 min
Aug 3, 5:16 PM EDT	Special Weather Statement	BOX	Franklin	29 min
Aug 3, 5:19 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Worcester	27 min
Aug 3, 5:20 PM EDT	Tornado Warning	BOX	Franklin, Worcester	25 min
Aug 3, 5:34 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Worcester	13 min
Aug 3, 5:50 PM EDT	Special Weather Statement	BOX	Hampden, Hampshire	55 min
Aug 3, 5:59 PM EDT	Flash Flood Warning	BOX	Franklin, Hampshire, Worcester	71 min
Aug 3, 6:03 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire, Worcester	27 min
Aug 3, 6:04 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire, Worcester	41 min
Aug 3, 7:08 PM EDT	Areal Flood Advisory	BOX	Worcester	21 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.