Alert archive / New Hampshire / Mesoscale Discussions in 2013

Mesoscale Discussion 1882

September 12, 20136 states

The Storm Prediction Center issued this mesoscale discussion at Sep 12, 2013, 3:26 PM EDT for 6 states. It was in force for 64 min.

The area

The outline as issued.

The facts

Issued: Sep 12, 2013, 3:26 PM EDT (19:26 UTC)
Expired: Sep 12, 2013, 4:30 PM EDT
In force: 64 min
Issued by: the Storm Prediction Center

All 29 counties

Berkshire County, MA, Essex County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Worcester County, MA, Cumberland County, ME, Knox County, ME, Lincoln County, ME, Sagadahoc County, ME, York County, ME, Belknap County, NH, Carroll County, NH, Cheshire County, NH, Grafton County, NH, Hillsborough County, NH, Merrimack County, NH, Rockingham County, NH, Strafford County, NH, Sullivan County, NH, Columbia County, NY, Dutchess County, NY, Orange County, NY, Putnam County, NY, Ulster County, NY, Pike County, PA, Bennington County, VT, Windham County, VT

The radar

The Albany radar (KENX), 112 km from the middle of the area, began a volume at 19:26 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 nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 7.4 hours before the alert went out and 97 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: 261 J/kg
Mixed-layer CIN: -114 J/kg
Mixed-layer LCL: 802 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

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
Sep 12, 12:24 PM EDT	Mesoscale Discussion	SPC		66 min
Sep 12, 12:37 PM EDT	Severe Thunderstorm Watch	SPC	Northwest Hills Planning Region	7 hr
Sep 12, 1:03 PM EDT	Severe Thunderstorm Watch	SPC	Greater Bridgeport Planning Region, Capitol Planning Region, Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region, Northeastern Connecticut Planning Region	9 hr
Sep 11, 9:44 PM EDT	Mesoscale Discussion	SPC	Androscoggin, Aroostook, Cumberland, Franklin, Kennebec, Lincoln and 7 more	61 min
Sep 12, 12:02 PM EDT	Mesoscale Discussion	SPC	Albany, Broome, Chemung, Chenango, Cortland, Delaware and 12 more	58 min
Sep 12, 2:41 PM EDT	Mesoscale Discussion	SPC	Albany, Broome, Chemung, Chenango, Cortland, Delaware and 18 more	64 min
Sep 12, 4:24 PM EDT	Mesoscale Discussion	SPC	Bronx, Kings, Nassau, New York, Queens, Richmond and 1 more	66 min
Sep 12, 2:50 PM EDT	Severe Thunderstorm Watch	SPC	Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more	6 hr

Nearby

Mesoscale Discussions in New Hampshire, 2013 Mesoscale Discussions in Connecticut, 2013 Mesoscale Discussions in Massachusetts, 2013 Every mesoscale discussion in 2013

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.