Alert archive / New Jersey / Mesoscale Discussions in 2019

Mesoscale Discussion 693

May 19, 201917 counties in New Jersey; 15 counties in New York; 11 counties in Pennsylvania

The Storm Prediction Center issued this mesoscale discussion at May 19, 2019, 6:55 PM EDT for 17 counties in New Jersey; 15 counties in New York; 11 counties in Pennsylvania. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: May 19, 2019, 6:55 PM EDT (22:55 UTC)
Expired: May 19, 2019, 8:30 PM EDT
In force: 95 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 43 counties

Bergen County, NJ, Burlington County, NJ, Camden County, NJ, Essex County, NJ, Gloucester County, NJ, Hudson County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Ocean County, NJ, Passaic County, NJ, Somerset County, NJ, Sussex County, NJ, Union County, NJ, Warren County, NJ, Bronx County, NY, Columbia County, NY, Dutchess County, NY, Greene County, NY, Kings County, NY, Nassau County, NY, New York County, NY, Orange County, NY, Putnam County, NY, Queens County, NY, Richmond County, NY, Rockland County, NY, Sullivan County, NY, Ulster County, NY, Westchester County, NY, Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Delaware County, PA, Lehigh County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA, Pike County, PA

The radar

The Philadelphia radar (KDIX), 116 km from the middle of the area, began a volume at 23:05 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

Brookhaven, NY (KOKX), launched 12:00Z, 10.9 hours before the alert went out and 144 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1318 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 80 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
May 19, 1:27 PM EDT	Mesoscale Discussion	SPC	Warren	2 hr
May 19, 2:36 PM EDT	Severe Thunderstorm Watch	SPC	Hunterdon, Mercer, Somerset, Warren	8 hr
May 19, 12:51 PM EDT	Mesoscale Discussion	SPC	Broome, Cayuga, Chemung, Chenango, Cortland, Delaware and 23 more	114 min
May 19, 1:51 PM EDT	Severe Thunderstorm Watch	SPC	Albany, Broome, Cayuga, Chemung, Chenango, Columbia and 32 more	9 hr
May 19, 4:07 PM EDT	Mesoscale Discussion	SPC	Cayuga, Essex, Fulton, Hamilton, Herkimer, Lewis and 8 more	83 min
May 19, 4:41 PM EDT	Mesoscale Discussion	SPC	Adams, Berks, Carbon, Chester, Columbia, Cumberland and 23 more	94 min

Nearby

Mesoscale Discussions in New Jersey, 2019 Mesoscale Discussions in New York, 2019 Mesoscale Discussions in Pennsylvania, 2019 Every mesoscale discussion in 2019

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.