Alert archive / North Carolina / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 136, NWS Raleigh, NC

July 29, 2020Wake County, North Carolina

NWS Raleigh, NC issued this severe thunderstorm warning at Jul 29, 2020, 5:17 PM EDT for Wake County, North Carolina. It was in force for 43 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 29, 2020, 5:17 PM EDT (21:17 UTC)
Expired: Jul 29, 2020, 6:00 PM EDT
In force: 43 min
Issued by: NWS Raleigh, NC
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Wake County, NC

The radar

The Raleigh/Durham radar (KRAX), 20 km from the middle of the area, began a volume at 21:19 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

Newport, NC (KMHX), launched 12:00Z, 9.3 hours before the alert went out and 196 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: 1999 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 663 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 50 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Raleigh, NC wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 28, 7:20 PM EDT, 21 hours 57 minutes earlier.

Area forecast discussion, Jul 28, 7:20 PM EDT, 21 hours 57 minutes before

<!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>

The office that day

Everything else NWS Raleigh, NC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 28, 8:27 PM EDT	Special Weather Statement	RAH	Chatham	63 min
Jul 28, 9:22 PM EDT	Special Weather Statement	RAH	Harnett	53 min
Jul 28, 10:11 PM EDT	Areal Flood Advisory	RAH	Cumberland, Harnett	3 hr
Jul 29, 1:01 AM EDT	Special Weather Statement	RAH	Davidson, Randolph	59 min
Jul 29, 2:45 PM EDT	Special Weather Statement	RAH	Durham, Franklin, Orange	60 min
Jul 29, 2:57 PM EDT	Special Weather Statement	RAH	Richmond	63 min
Jul 29, 4:06 PM EDT	Special Weather Statement	RAH	Franklin, Wake	69 min
Jul 29, 4:34 PM EDT	Areal Flood Advisory	RAH	Orange	3 hr
Jul 29, 5:10 PM EDT	Areal Flood Advisory	RAH	Wake	2 hr
Jul 29, 5:29 PM EDT	Areal Flood Advisory	RAH	Cumberland, Sampson	2 hr
Jul 29, 5:38 PM EDT	Special Weather Statement	RAH	Randolph	67 min
Jul 29, 5:55 PM EDT	Special Weather Statement	RAH	Guilford	65 min
Jul 29, 6:20 PM EDT	Areal Flood Advisory	RAH	Guilford	2 hr
Jul 29, 6:56 PM EDT	Special Weather Statement	RAH	Davidson	79 min
Jul 29, 7:30 PM EDT	Areal Flood Advisory	RAH	Davidson, Guilford, Randolph	2 hr

Nearby

Severe Thunderstorm Warnings in North Carolina, 2020 Every severe thunderstorm warning in 2020

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.