Alert archive / Wyoming / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 52, NWS Riverton, WY

June 27, 2026Big Horn County, Johnson County, Washakie County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Jun 27, 2026, 5:55 PM MDT for Big Horn County, Johnson County, Washakie County, Wyoming. It was in force for 35 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: Jun 27, 2026, 5:55 PM MDT (23:55 UTC)
Expired: Jun 27, 2026, 6:30 PM MDT
In force: 35 min
Issued by: NWS Riverton, WY
Area: Storm-based polygon
Damage threat: Considerable
Hail: 0.75 in
Wind: 70.0 mph

Counties Big Horn County, WY, Johnson County, WY, Washakie County, WY

The radar

The Riverton/Lander radar (KRIW), 148 km from the middle of the area, began a volume at 23:55 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 27, 1:02 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

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 Riverton, WY wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 27, 4:40 PM MDT, 1 hour 15 minutes earlier.

Area forecast discussion, Jun 27, 4:40 PM MDT, 1 hour 15 minutes before

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In the hours before

Local storm report, Jun 27, 5:45 PM MDT, 10 minutes before

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Local storm report, Jun 27, 5:47 PM MDT, 8 minutes before

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Local storm report, Jun 27, 5:48 PM MDT, 7 minutes before

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      <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.
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      <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.
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Local storm report, Jun 27, 5:49 PM MDT, 6 minutes before

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<body>
  <main class="wrap">
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      <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.
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Local storm report, Jun 27, 5:50 PM MDT, 5 minutes before

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<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>
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Local storm report, Jun 27, 5:54 PM MDT, 1 minute before

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<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 Riverton, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 27, 11:31 AM MDT	Special Weather Statement	RIW		29 min
Jun 27, 12:57 PM MDT	Special Weather Statement	RIW	Johnson	33 min
Jun 27, 12:59 PM MDT	Special Weather Statement	RIW		31 min
Jun 27, 1:09 PM MDT	Severe Thunderstorm Warning	RIW	Johnson	36 min
Jun 27, 1:20 PM MDT	Special Weather Statement	RIW		25 min
Jun 27, 2:30 PM MDT	Severe Thunderstorm Warning	RIW	Fremont	30 min
Jun 27, 2:51 PM MDT	Special Weather Statement	RIW	Johnson	24 min
Jun 27, 3:13 PM MDT	Severe Thunderstorm Warning	RIW	Fremont, Natrona	47 min
Jun 27, 3:14 PM MDT	Special Weather Statement	RIW	Sublette	31 min
Jun 27, 3:33 PM MDT	Severe Thunderstorm Warning	RIW	Fremont	27 min
Jun 27, 3:54 PM MDT	Severe Thunderstorm Warning	RIW	Fremont	36 min
Jun 27, 4:15 PM MDT	Severe Thunderstorm Warning	RIW	Fremont	30 min
Jun 27, 4:36 PM MDT	Severe Thunderstorm Warning	RIW	Fremont	24 min
Jun 27, 4:47 PM MDT	Special Weather Statement	RIW	Johnson	28 min
Jun 27, 5:23 PM MDT	Special Weather Statement	RIW	Hot Springs	22 min
Jun 27, 5:25 PM MDT	Special Weather Statement	RIW	Johnson	35 min
Jun 27, 5:48 PM MDT	Severe Thunderstorm Warning Considerable damage threat	RIW	Johnson	31 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2026 Every severe thunderstorm warning in 2026

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.