Alert archive / New York / Mesoscale Discussions in 2012

Mesoscale Discussion 1962

September 18, 201217 counties in New York

The Storm Prediction Center issued this mesoscale discussion at Sep 18, 2012, 12:57 PM EDT for 17 counties in New York. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Sep 18, 2012, 12:57 PM EDT (16:57 UTC)
Expired: Sep 18, 2012, 2:30 PM EDT
In force: 93 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

Counties Albany County, NY, Broome County, NY, Chemung County, NY, Chenango County, NY, Columbia County, NY, Cortland County, NY, Delaware County, NY, Greene County, NY, Madison County, NY, Montgomery County, NY, Otsego County, NY, Rensselaer County, NY, Schenectady County, NY, Schoharie County, NY, Tioga County, NY, Tompkins County, NY, Ulster County, NY

The radar

The Albany radar (KENX), 75 km from the middle of the area, began a volume at 16:59 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.

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 5.0 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: 2 J/kg
Mixed-layer CIN: -126 J/kg
Mixed-layer LCL: 572 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 251 m²/s²
0-3 km storm-relative helicity: 226 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
Sep 18, 11:14 AM EDT	Mesoscale Discussion	SPC	Bronx, Dutchess, Kings, Nassau, New York, Orange and 5 more	91 min
Sep 18, 11:19 AM EDT	Mesoscale Discussion	SPC	Albany, Broome, Chenango, Delaware, Fulton, Greene and 8 more	86 min
Sep 18, 12:10 PM EDT	Tornado Watch	SPC	Bronx, Kings, New York, Orange, Queens, Richmond and 2 more	9 hr
Sep 18, 1:21 PM EDT	Tornado Watch	SPC	Broome, Chenango, Cortland, Delaware, Madison, Oneida and 4 more	5 hr
Sep 18, 1:56 PM EDT	Mesoscale Discussion	SPC	Kings, New York, Orange, Richmond, Rockland	64 min
Sep 18, 2:10 PM EDT	Mesoscale Discussion	SPC	Clinton, Essex, Franklin, Fulton, Hamilton, Herkimer and 6 more	95 min
Sep 18, 3:26 PM EDT	Mesoscale Discussion	SPC	Albany, Columbia, Dutchess, Essex, Franklin, Fulton and 11 more	34 min
Sep 18, 3:38 PM EDT	Tornado Watch	SPC	Albany, Columbia, Dutchess, Fulton, Greene, Hamilton and 13 more	8 hr
Sep 18, 4:21 PM EDT	Mesoscale Discussion	SPC	Albany, Bronx, Chenango, Columbia, Delaware, Dutchess and 24 more	114 min
Sep 18, 6:08 PM EDT	Mesoscale Discussion	SPC	Bronx, Kings, New York, Queens, Richmond	67 min
Sep 18, 7:42 PM EDT	Mesoscale Discussion	SPC	Bronx, Kings, Nassau, Putnam, Queens, Suffolk and 1 more	63 min

Nearby

Mesoscale Discussions in New York, 2012 Every mesoscale discussion 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.