Alert archive / New York / Mesoscale Discussions in 2012

Mesoscale Discussion 1931

September 8, 2012Berkshire County, Hampden County, Hampshire County, Massachusetts; Bergen County, Hudson County, New Jersey; 9 counties in New York

The Storm Prediction Center issued this mesoscale discussion at Sep 8, 2012, 1:30 PM EDT for Berkshire County, Hampden County, Hampshire County, Massachusetts; Bergen County, Hudson County, New Jersey; 9 counties in New York. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued
Sep 8, 2012, 1:30 PM EDT (17:30 UTC)
Expired
Sep 8, 2012, 2:30 PM EDT
In force
60 min
Issued by
the Storm Prediction Center

Counties Berkshire County, MA, Hampden County, MA, Hampshire County, MA, Bergen County, NJ, Hudson County, NJ, Bronx County, NY, Dutchess County, NY, Kings County, NY, Nassau County, NY, New York County, NY, Putnam County, NY, Queens County, NY, Rockland County, NY, Westchester County, NY

The radar

The Brookhaven radar (KOKX), 89 km from the middle of the area, began a volume at 17:31 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

Brookhaven, NY (KOKX), launched 12:00Z, 5.5 hours before the alert went out and 89 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-pSkew-T log-p diagram, Brookhaven, NY at 12:00Z on 2012-09-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 173 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2012-09-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 103 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
173 J/kg
Mixed-layer CIN
-96 J/kg
Mixed-layer LCL
793 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
103 m²/s²
0-3 km storm-relative helicity
120 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.1

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.

IssuedProductOfficeCountiesLasted
Sep 8, 10:39 AM EDTMesoscale DiscussionSPC2 hr
Sep 8, 11:18 AM EDTTornado WatchSPCGreater Bridgeport Planning Region, Capitol Planning Region, Northwest Hills Planning Region, Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region10 hr
Sep 8, 12:40 PM EDTTornado WatchSPCNorthwest Hills Planning Region7 hr
Sep 8, 3:55 PM EDTMesoscale DiscussionSPC65 min
Sep 8, 4:47 PM EDTSevere Thunderstorm WatchSPCCapitol Planning Region, Northeastern Connecticut Planning Region6 hr
Sep 8, 6:17 PM EDTMesoscale DiscussionSPC58 min
Sep 8, 2:46 PM EDTMesoscale DiscussionSPCBerkshire59 min
Sep 8, 7:53 PM EDTMesoscale DiscussionSPCBristol, Dukes, Essex, Middlesex, Norfolk, Plymouth and 2 more97 min
Sep 8, 12:15 PM EDTSevere Thunderstorm WatchSPCAtlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more9 hr
Sep 8, 2:12 PM EDTMesoscale DiscussionSPCBurlington, Camden, Cumberland, Essex, Gloucester, Hunterdon and 8 more93 min
Sep 8, 4:22 PM EDTMesoscale DiscussionSPCAtlantic, Burlington, Camden, Cape May, Cumberland, Essex and 11 more53 min
Sep 8, 12:57 AM EDTMesoscale DiscussionSPCChautauqua2 hr
Sep 8, 8:42 AM EDTMesoscale DiscussionSPCBroome, Cayuga, Chemung, Chenango, Cortland, Herkimer and 13 more93 min
Sep 8, 10:03 AM EDTSevere Thunderstorm WatchSPCAllegany, Cattaraugus, Cayuga, Chemung, Franklin, Genesee and 16 more5 hr
Sep 8, 11:38 AM EDTMesoscale DiscussionSPCAlbany, Broome, Chemung, Chenango, Cortland, Delaware and 18 more97 min

Nearby

Mesoscale Discussions in New York, 2012Mesoscale Discussions in Connecticut, 2012Mesoscale Discussions in Massachusetts, 2012Every 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.