Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 56, NWS Boston/Norton, MA

July 18, 2012Barnstable County, Plymouth County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 18, 2012, 4:42 PM EDT for Barnstable County, Plymouth County, Massachusetts. It was in force for 36 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: Jul 18, 2012, 4:42 PM EDT (20:42 UTC)
Expired: Jul 18, 2012, 5:18 PM EDT
In force: 36 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon

Counties Barnstable County, MA, Plymouth County, MA

The radar

The Boston radar (KBOX), 80 km from the middle of the area, began a volume at 20:44 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jul 18, 12:20 PM EDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Chatham, MA (KCHH), launched 12:00Z, 8.7 hours before the alert went out and 22 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: 1521 J/kg
Mixed-layer CIN: -208 J/kg
Mixed-layer LCL: 1597 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 48 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

746 
WUUS51 KBOX 182042
SVRBOX
MAC001-023-182145-
/O.NEW.KBOX.SV.W.0056.120718T2042Z-120718T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
ISSUED BY NATIONAL WEATHER SERVICE NEW YORK NY
442 PM EDT WED JUL 18 2012

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BARNSTABLE COUNTY IN SOUTHEAST MASSACHUSETTS...
  SOUTHEASTERN PLYMOUTH COUNTY IN SOUTHEAST MASSACHUSETTS...

* UNTIL 545 PM EDT...

* AT 439 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED NEAR SANDWICH...OR 14 MILES
  NORTH OF FALMOUTH...AND MOVING EAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  SANDWICH BY 445 PM...
  BARNSTABLE BY 505 PM...
  YARMOUTH BY 510 PM...
  DENNIS BY 515 PM...
  HARWICH AND BREWSTER BY 525 PM...
  ORLEANS BY 530 PM...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

STRONG WINDS WILL PRECEDE RAIN...LIGHTNING AND THUNDER. DO NOT WAIT 
FOR THE SOUND OF THUNDER BEFORE TAKING COVER. SEEK SHELTER 
IMMEDIATELY INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4183 6993 4206 7009 4209 7023 4206 7027
      4201 7011 4179 7003 4172 7027 4176 7045
      4183 7054 4152 7067 4155 7047 4163 7041
      4160 7039 4160 7026 4165 6998 4154 7003
      4154 6999 4170 6992
TIME...MOT...LOC 2041Z 275DEG 31KT 4175 7058

$$

JST

1 follow-up statement

219 
WWUS51 KBOX 182118
SVSBOX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
ISSUED BY NATIONAL WEATHER SERVICE NEW YORK NY
518 PM EDT WED JUL 18 2012

MAC001-023-182126-
/O.CAN.KBOX.SV.W.0056.000000T0000Z-120718T2145Z/
PLYMOUTH MA-BARNSTABLE MA-
518 PM EDT WED JUL 18 2012

...THE SEVERE THUNDERSTORM WARNING FOR BARNSTABLE AND EXTREME
SOUTHEASTERN PLYMOUTH COUNTIES IS CANCELLED...

THE THUNDERSTORMS HAVE WEAKENED AS THEY MOVED EAST. RESIDENTS OF THE 
OUTER CAPE WILL STILL SEE HEAVY RAIN AND FREQUENT LIGHTNING THROUGH 
545 PM.  

LAT...LON 4170 6992 4154 6999 4154 7003 4165 6998
      4160 7026 4160 7039 4163 7041 4155 7047
      4152 7067 4183 7054 4176 7045 4172 7027
      4179 7003 4201 7011 4206 7027 4209 7023
      4206 7009 4183 6993
TIME...MOT...LOC 2116Z 275DEG 31KT 4172 7018

$$

JST

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 8:23 PM EDT	Special Weather Statement	BOX	Essex	67 min
Jul 18, 12:37 PM EDT	Special Weather Statement	BOX	Middlesex	53 min
Jul 18, 12:41 PM EDT	Heat Advisory	BOX	Bristol, Essex, Franklin, Hampden, Hampshire, Middlesex and 2 more	6 hr
Jul 18, 12:54 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex	66 min
Jul 18, 1:21 PM EDT	Special Marine Warning	BOX		84 min
Jul 18, 1:29 PM EDT	Flash Flood Warning	BOX	Essex, Middlesex	98 min
Jul 18, 1:43 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex, Suffolk	36 min
Jul 18, 1:45 PM EDT	Special Marine Warning	BOX		60 min
Jul 18, 1:50 PM EDT	Special Weather Statement	BOX	Hampden	40 min
Jul 18, 2:04 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Hampshire, Worcester	56 min
Jul 18, 2:04 PM EDT	Tornado Warning	BOX	Essex, Suffolk	12 min
Jul 18, 2:21 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex, Suffolk	39 min
Jul 18, 2:21 PM EDT	Severe Thunderstorm Warning	BOX	Hampden	54 min
Jul 18, 2:24 PM EDT	Flash Flood Warning	BOX	Hampden, Worcester	3 hr
Jul 18, 2:30 PM EDT	Special Marine Warning	BOX		90 min
Jul 18, 2:39 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Middlesex, Norfolk, Plymouth, Suffolk, Worcester	51 min
Jul 18, 2:44 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Norfolk, Worcester	61 min
Jul 18, 3:09 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Norfolk, Worcester	51 min
Jul 18, 3:46 PM EDT	Severe Thunderstorm Warning	BOX	Barnstable, Bristol, Norfolk, Plymouth	59 min
Jul 18, 4:04 PM EDT	Special Marine Warning	BOX		56 min
Jul 18, 4:25 PM EDT	Special Marine Warning	BOX		80 min
Jul 18, 5:08 PM EDT	Special Weather Statement	BOX	Norfolk, Suffolk	52 min
Jul 18, 5:24 PM EDT	Flash Flood Warning	BOX	Middlesex, Norfolk, Suffolk	78 min
Jul 18, 5:27 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Norfolk, Plymouth, Suffolk	48 min
Jul 18, 5:30 PM EDT	Special Marine Warning	BOX		54 min
Jul 18, 6:08 PM EDT	Special Marine Warning	BOX		67 min
Jul 18, 6:27 PM EDT	Special Weather Statement	BOX	Essex	33 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 2012 Every severe thunderstorm warning in 2012

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.