Alert archive / Massachusetts / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 37, NWS Boston/Norton, MA

July 1, 2012Barnstable County, Plymouth County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 1, 2012, 3:40 PM EDT for Barnstable County, Plymouth County, Massachusetts. It was in force for 50 min. 1 report 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: Jul 1, 2012, 3:40 PM EDT (19:40 UTC)
Expired: Jul 1, 2012, 4:30 PM EDT
In force: 50 min
Issued by: NWS Boston/Norton, MA
Area: Storm-based polygon

Counties Barnstable County, MA, Plymouth County, MA

The radar

The Boston radar (KBOX), 41 km from the middle of the area, began a volume at 19:40 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

Time	Report	Where	Remark
Jul 1, 3:52 PM EDT	TSTM WND DMG	Plymouth, MA	WIRES DOWN ON COURT STREET

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

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 1, 1:35 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Chatham, MA (KCHH), launched 12:00Z, 7.7 hours before the alert went out and 63 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: 121 J/kg
Mixed-layer CIN: -78 J/kg
Mixed-layer LCL: 1755 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: 68 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.

985 
WUUS51 KBOX 011940
SVRBOX
MAC001-023-012030-
/O.NEW.KBOX.SV.W.0037.120701T1940Z-120701T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
ISSUED BY NATIONAL WEATHER SERVICE NEW YORK NY
340 PM EDT SUN JUL 1 2012

THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A

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

* UNTIL 430 PM EDT...

* AT 335 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  KINGSTON...OR NEAR PLYMOUTH...AND MOVING EAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL
  AREAS OF THE INDICATED COUNTIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

LAT...LON 4202 7021 4203 7025 4192 7054 4185 7052
      4183 7054 4193 7095 4209 7094 4207 7064
      4200 7059 4198 7064 4195 7063 4195 7059
      4192 7053 4204 7024 4204 7021
TIME...MOT...LOC 1940Z 284DEG 24KT 4197 7070

$$

JM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 1, 3:04 PM EDT	Severe Thunderstorm Warning	BOX	Norfolk, Worcester	41 min
Jul 1, 3:06 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Hampshire	39 min
Jul 1, 3:42 PM EDT	Special Marine Warning	BOX		48 min
Jul 1, 3:44 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Worcester	46 min
Jul 1, 3:48 PM EDT	Special Marine Warning	BOX		27 min
Jul 1, 4:34 PM EDT	Severe Thunderstorm Warning	BOX	Bristol	41 min
Jul 1, 4:56 PM EDT	Special Marine Warning	BOX		34 min
Jul 1, 5:02 PM EDT	Special Marine Warning	BOX		43 min
Jul 1, 5:33 PM EDT	Special Marine Warning	BOX		27 min
Jul 1, 5:43 PM EDT	Special Weather Statement	BOX	Dukes	47 min
Jul 1, 5:52 PM EDT	Special Marine Warning	BOX		38 min
Jul 1, 6:11 PM EDT	Special Marine Warning	BOX		49 min
Jul 1, 6:56 PM EDT	Special Marine Warning	BOX		49 min
Jul 1, 7:03 PM EDT	Special Marine Warning	BOX		57 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.