Alert archive / Connecticut / Mesoscale Discussions in 2004

Mesoscale Discussion 1465

July 2, 20044 states

The Storm Prediction Center issued this mesoscale discussion at Jul 2, 2004, 11:54 AM EDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 2, 2004, 11:54 AM EDT (15:54 UTC)
Expired: Jul 2, 2004, 2:00 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Essex County, MA, Middlesex County, MA, Worcester County, MA, Androscoggin County, ME, Cumberland County, ME, Kennebec County, ME, Lincoln County, ME, Oxford County, ME, Sagadahoc County, ME, York County, ME, Rockingham County, NH, Strafford County, NH, Nassau County, NY, Queens County, NY

The radar

The Portland,ME radar (KGYX), 103 km from the middle of the area, began a volume at 15:54 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.

Severe Thunderstorm Watch 533Jul 2, 12:40 PM EDT

The nearest sounding before it

Gray, ME (KGYX), launched 12:00Z, 3.9 hours before the alert went out and 103 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: 23 J/kg
Mixed-layer CIN: -187 J/kg
Mixed-layer LCL: 1396 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 83 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	Lasted
Jul 2, 12:40 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jul 2, 2:09 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 2, 3:55 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 2, 5:46 PM EDT	Mesoscale Discussion	SPC	59 min

Nearby

Mesoscale Discussions in Connecticut, 2004 Mesoscale Discussions in Maine, 2004 Mesoscale Discussions in Massachusetts, 2004 Every mesoscale discussion in 2004

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.