Alert archive / Massachusetts / Mesoscale Discussions in 2011

Mesoscale Discussion 1056

June 1, 2011Bristol County, Dukes County, Plymouth County, Massachusetts; Bristol County, Newport County, Rhode Island

The Storm Prediction Center issued this mesoscale discussion at Jun 1, 2011, 5:47 PM EDT for Bristol County, Dukes County, Plymouth County, Massachusetts; Bristol County, Newport County, Rhode Island. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Jun 1, 2011, 5:47 PM EDT (21:47 UTC)
Expired: Jun 1, 2011, 6:45 PM EDT
In force: 58 min
Issued by: the Storm Prediction Center

Counties Bristol County, MA, Dukes County, MA, Plymouth County, MA, Bristol County, RI, Newport County, RI

The radar

The Boston radar (KBOX), 31 km from the middle of the area, began a volume at 21:50 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 416Jun 1, 7:40 PM EDT

The nearest sounding before it

Chatham, MA (KCHH), launched 12:00Z, 9.8 hours before the alert went out and 93 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1250 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 141 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 1, 10:02 AM EDT	Severe Thunderstorm Watch	SPC	Berkshire	7 hr
Jun 1, 12:26 PM EDT	Mesoscale Discussion	SPC	Berkshire, Franklin, Hampden, Hampshire, Middlesex, Worcester	64 min
Jun 1, 12:58 PM EDT	Tornado Watch	SPC	Bristol, Essex, Franklin, Hampden, Hampshire, Middlesex and 4 more	7 hr
Jun 1, 4:17 PM EDT	Mesoscale Discussion	SPC	Berkshire, Franklin, Hampden, Hampshire, Middlesex, Worcester	88 min
Jun 1, 7:09 PM EDT	Mesoscale Discussion	SPC	Berkshire, Bristol, Essex, Franklin, Hampden, Hampshire and 4 more	96 min
Jun 1, 7:40 PM EDT	Tornado Watch	SPC	Bristol, Essex, Franklin, Hampden, Hampshire, Middlesex and 4 more	2 hr

Nearby

Mesoscale Discussions in Massachusetts, 2011 Mesoscale Discussions in Rhode Island, 2011 Every mesoscale discussion in 2011

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.