Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 45, NWS Boston/Norton, MA

August 3, 2018Franklin County, Worcester County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 3, 2018, 5:19 PM EDT for Franklin County, Worcester County, Massachusetts. It was in force for 27 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, 5:19 PM EDT (21:19 UTC)
Expired: Aug 3, 2018, 5:46 PM EDT
In force: 27 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Franklin County, MA, Worcester County, MA

The radar

The Boston radar (KBOX), 121 km from the middle of the area, began a volume at 21:21 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, 9.3 hours before the alert went out and 131 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.

087 
WUUS51 KBOX 032119
SVRBOX
MAC011-027-032215-
/O.NEW.KBOX.SV.W.0045.180803T2119Z-180803T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
519 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...
  Northeastern Franklin County in western Massachusetts...

* Until 615 PM EDT.

* At 519 PM EDT, a severe thunderstorm was located over Erving, or
  near Orange, moving northeast at 35 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Orange, Winchendon, Northfield, Fitzwilliam, Erving, Gill,
  Royalston, Wendell, Warwick and Rindge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4272 7203 4271 7199 4257 7244 4264 7249
      4272 7239
TIME...MOT...LOC 2119Z 235DEG 29KT 4263 7241 

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

Sipprell

1 follow-up statement

913 
WWUS51 KBOX 032146
SVSBOX

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

MAC011-027-032156-
/O.CAN.KBOX.SV.W.0045.000000T0000Z-180803T2215Z/
Worcester MA-Franklin MA-
546 PM EDT FRI AUG 3 2018

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN WORCESTER AND
NORTHEASTERN FRANKLIN COUNTIES 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 has been cancelled.

However, heavy rain and gusty winds continue. There is the threat of 
flooding which continues to be monitored. 

LAT...LON 4272 7203 4271 7199 4257 7244 4264 7249
      4272 7239
TIME...MOT...LOC 2144Z 235DEG 29KT 4275 7217 

$$

Sipprell

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, 5:20 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, 6:27 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	48 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.