Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 110, NWS Boston/Norton, MA

September 13, 2021Essex County, Middlesex County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Sep 13, 2021, 3:14 AM EDT for Essex County, Middlesex County, Massachusetts. It was in force for 31 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
Sep 13, 2021, 3:14 AM EDT (07:14 UTC)
Expired
Sep 13, 2021, 3:45 AM EDT
In force
31 min
Issued by
NWS Boston/Norton, MA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Essex County, MA, Middlesex County, MA

The radar

The Boston radar (KBOX), 75 km from the middle of the area, began a volume at 07:14 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

TimeReportWhereRemark
Sep 13, 3:30 AM EDTTSTM WND DMG1 Sse Danvers, MALARGE TREE LIMB DOWNED BLOCKING PART OF ASH ST IN DANVERS. RELAYED BY AMATEUR RADIO.
Sep 13, 3:38 AM EDTTSTM WND DMG1 Se Danvers, MAPHOTO FROM AJ BURNETT WCVB ON TWITTER OF A LARGE TREE LIMB DOWNED ON FOWLER ST IN DANVERS WHICH DAMAGED A PICKUP TRUCK. TIME ESTIMATED.
Sep 13, 3:38 AM EDTTSTM WND DMG1 Se Danvers, MAPHOTO FROM MEDIA ON TWITTER OF A LARGE TREE LIMB DOWNED ON FOWLER ST IN DANVERS WHICH DAMAGED A PICKUP TRUCK. TIME ESTIMATED.

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

The nearest sounding before it

Gray, ME (KGYX), launched 00:00Z, 7.2 hours before the alert went out and 151 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-pSkew-T log-p diagram, Gray, ME at 00:00Z on 2021-09-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 59 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Gray, ME at 00:00Z on 2021-09-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 66 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
59 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
1125 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
66 m²/s²
0-3 km storm-relative helicity
114 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

As transmitted.

579 
WUUS51 KBOX 130714
SVRBOX
MAC009-017-130745-
/O.NEW.KBOX.SV.W.0110.210913T0714Z-210913T0745Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Boston/Norton MA
314 AM EDT Mon Sep 13 2021

The National Weather Service in Boston/Norton has issued a

* Severe Thunderstorm Warning for...
  Southern Essex County in northeastern Massachusetts...
  East central Middlesex County in northeastern Massachusetts...

* Until 345 AM EDT.

* At 314 AM EDT, a severe thunderstorm was located over North
  Reading, or near Peabody, moving east at 55 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Expect wind damage to trees and power lines. Minor hail 
           damage to vehicles is possible.

* Locations impacted include...
  Lynn, Peabody, Salem, Beverly, Woburn, Andover, Tewksbury,
  Gloucester, North Andover, Danvers, Wakefield, Reading, Wilmington,
  Marblehead, North Reading, Swampscott, Ipswich, Lynnfield,
  Middleton and Boxford.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4265 7059 4258 7066 4260 7065 4261 7068
      4258 7070 4254 7090 4253 7088 4250 7089
      4252 7085 4248 7089 4253 7119 4264 7118
      4265 7068 4264 7069 4265 7067
TIME...MOT...LOC 0714Z 275DEG 49KT 4258 7107 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

BL
2 follow-up statements
448 
WWUS51 KBOX 130727
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
327 AM EDT Mon Sep 13 2021

MAC017-130736-
/O.CAN.KBOX.SV.W.0110.000000T0000Z-210913T0745Z/
Middlesex MA-
327 AM EDT Mon Sep 13 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL MIDDLESEX COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4265 7059 4258 7066 4260 7065 4261 7068
      4258 7070 4254 7090 4253 7088 4250 7089
      4252 7098 4263 7096 4265 7068 4264 7069
      4265 7067
TIME...MOT...LOC 0726Z 275DEG 47KT 4256 7087 

$$

MAC009-130745-
/O.CON.KBOX.SV.W.0110.000000T0000Z-210913T0745Z/
Essex MA-
327 AM EDT Mon Sep 13 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 AM EDT
FOR SOUTHEASTERN ESSEX COUNTY...

At 326 AM EDT, a severe thunderstorm was located over Beverly, moving
east at 55 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Expect wind damage to trees and power lines. Minor hail 
         damage to vehicles is possible.

Locations impacted include...
Peabody, Salem, Beverly, Gloucester, Danvers, Hamilton, Rockport,
Topsfield, Manchester, Wenham and Essex.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4265 7059 4258 7066 4260 7065 4261 7068
      4258 7070 4254 7090 4253 7088 4250 7089
      4252 7098 4263 7096 4265 7068 4264 7069
      4265 7067
TIME...MOT...LOC 0726Z 275DEG 47KT 4256 7087 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

BL
287 
WWUS51 KBOX 130742
SVSBOX

Severe Weather Statement
National Weather Service Boston/Norton MA
342 AM EDT Mon Sep 13 2021

MAC009-130752-
/O.EXP.KBOX.SV.W.0110.000000T0000Z-210913T0745Z/
Essex MA-
342 AM EDT Mon Sep 13 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ESSEX COUNTY WILL
EXPIRE AT 345 AM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

LAT...LON 4265 7059 4258 7066 4260 7065 4261 7068
      4258 7070 4254 7090 4253 7088 4250 7089
      4252 7098 4263 7096 4265 7068 4264 7069
      4265 7067
TIME...MOT...LOC 0742Z 275DEG 49KT 4254 7061 

$$

BL

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 13, 2:44 AM EDTSpecial Weather StatementBOXEssex46 min
Sep 13, 3:17 AM EDTSpecial Marine WarningBOX43 min
Sep 13, 3:51 AM EDTSpecial Marine WarningBOX25 min
Sep 13, 5:24 AM EDTSpecial Weather StatementBOXEssex66 min
Sep 13, 5:34 AM EDTSevere Thunderstorm WarningBOXEssex, Middlesex31 min
Sep 13, 5:39 AM EDTSpecial Marine WarningBOX66 min
Sep 13, 8:02 AM EDTSpecial Marine WarningBOX43 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2021Every severe thunderstorm warning in 2021

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.