Alert archive / New York / Mesoscale Discussions in 2018

Mesoscale Discussion 104

March 1, 201812 counties in New York; Ashtabula County, Geauga County, Lake County, Ohio; 7 counties in Pennsylvania

The Storm Prediction Center issued this mesoscale discussion at Mar 1, 2018, 8:43 PM EST for 12 counties in New York; Ashtabula County, Geauga County, Lake County, Ohio; 7 counties in Pennsylvania. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Mar 1, 2018, 8:43 PM EST (01:43 UTC)
Expired: Mar 2, 2018, 2:45 AM EST
In force: 6 hr
Issued by: the Storm Prediction Center

All 22 counties

Allegany County, NY, Cattaraugus County, NY, Chautauqua County, NY, Erie County, NY, Genesee County, NY, Livingston County, NY, Monroe County, NY, Niagara County, NY, Ontario County, NY, Orleans County, NY, Steuben County, NY, Wyoming County, NY, Ashtabula County, OH, Geauga County, OH, Lake County, OH, Crawford County, PA, Erie County, PA, Forest County, PA, McKean County, PA, Potter County, PA, Venango County, PA, Warren County, PA

The radar

The Buffalo radar (KBUF), 80 km from the middle of the area, began a volume at 01:44 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

Pittsburgh, PA (KAGC), launched 00:00Z, 1.7 hours before the alert went out and 225 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: 19 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 615 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 239 m²/s²
0-3 km storm-relative helicity: 242 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

<!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
Mar 2, 3:15 AM EST	Mesoscale Discussion	SPC	Albany, Broome, Chenango, Columbia, Cortland, Delaware and 19 more	6 hr

Nearby

Mesoscale Discussions in New York, 2018 Mesoscale Discussions in Pennsylvania, 2018 Mesoscale Discussions in Ohio, 2018 Every mesoscale discussion in 2018

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.