Alert archive / Nevada / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 6, NWS Las Vegas, NV

May 4, 2025Clark County, Nevada; Mohave County, Arizona

NWS Las Vegas, NV issued this severe thunderstorm warning at May 4, 2025, 11:05 AM PDT for Clark County, Nevada; Mohave County, Arizona. It was in force for 7 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: May 4, 2025, 11:05 AM PDT (18:05 UTC)
Expired: May 4, 2025, 11:12 AM PDT
In force: 7 min
Issued by: NWS Las Vegas, NV
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Mohave County, AZ, Clark County, NV

The radar

The Las Vegas radar (KESX), 54 km from the middle of the area, began a volume at 18:04 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

Las Vegas, NV (KVEF), launched 12:00Z, 6.1 hours before the alert went out and 113 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: 1884 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 76 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 Las Vegas, NV wrote its last area forecast discussion before this severe thunderstorm warning went out at May 4, 10:33 AM PDT, 32 minutes earlier.

Area forecast discussion, May 4, 10:33 AM PDT, 32 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>

In the hours before

Local storm report, May 4, 10:32 AM PDT, 33 minutes before

Preliminary Local Storm Report
National Weather Service Las Vegas NV
1032 AM PDT Sun May 4 2025

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0235 PM     Tstm Wnd Gst     3 SW Mercury            36.62N 116.03W
05/03/2025  M69 MPH          Nye                NV   ASOS

            Corrects previous tstm wnd gst report from 3
            SW Mercury. Desert Rock ASOS gusted to 69
            mph from a nearby thunderstorm.

&&

JS

The office that day

Everything else NWS Las Vegas, NV issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 4, 12:14 PM PDT	Areal Flood Advisory	VEF	San Bernardino	3 hr
May 4, 3:34 PM PDT	Flash Flood Warning Considerable damage threat	VEF	San Bernardino	4 hr
May 4, 4:56 PM PDT	Areal Flood Advisory	VEF	San Bernardino	3 hr
May 4, 10:42 AM PDT	Severe Thunderstorm Warning	VEF	Mohave	48 min
May 4, 1:47 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr
May 4, 3:07 PM PDT	Flash Flood Warning Considerable damage threat	VEF	Mohave	3 hr

Nearby

Severe Thunderstorm Warnings in Nevada, 2025 Severe Thunderstorm Warnings in Arizona, 2025 Every severe thunderstorm warning in 2025

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.