Alert archive / Wyoming / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 29, NWS Riverton, WY

June 24, 2026Fremont County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Jun 24, 2026, 10:08 PM MDT for Fremont County, Wyoming. It was in force for 37 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 24, 2026, 10:08 PM MDT (04:08 UTC)
Expired: Jun 24, 2026, 10:45 PM MDT
In force: 37 min
Issued by: NWS Riverton, WY
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Fremont County, WY

The radar

The Riverton/Lander radar (KRIW), 13 km from the middle of the area, began a volume at 04:10 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

Grand Junction, CO (KGJT), launched 00:00Z, 4.1 hours before the alert went out and 435 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: 3811 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 13 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 Riverton, WY wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 24, 6:00 PM MDT, 4 hours 8 minutes earlier.

Area forecast discussion, Jun 24, 6:00 PM MDT, 4 hours 8 minutes before

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In the hours before

Special weather statement, Jun 24, 8:42 PM MDT, 1 hour 26 minutes before

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Special weather statement, Jun 24, 9:13 PM MDT, 55 minutes before

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      <div class="status" id="status">Temporary Notice</div>
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      <p id="message1">
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Special weather statement, Jun 24, 9:16 PM MDT, 52 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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        Please try again in a few minutes.
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Special weather statement, Jun 24, 9:28 PM MDT, 40 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.
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Special weather statement, Jun 24, 9:46 PM MDT, 22 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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Special weather statement, Jun 24, 9:54 PM MDT, 14 minutes before

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<html lang="en">
<head>
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  <title>Service Notice</title>
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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>
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</body>
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The office that day

Everything else NWS Riverton, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 24, 6:59 PM MDT	Special Weather Statement	RIW		31 min
Jun 24, 7:17 PM MDT	Special Weather Statement	RIW		28 min
Jun 24, 7:35 PM MDT	Special Weather Statement	RIW		25 min
Jun 24, 7:38 PM MDT	Special Weather Statement	RIW	Park	37 min
Jun 24, 8:34 PM MDT	Special Weather Statement	RIW		26 min
Jun 24, 8:41 PM MDT	Special Weather Statement	RIW	Natrona	34 min
Jun 24, 8:42 PM MDT	Special Weather Statement	RIW	Natrona	33 min
Jun 24, 9:00 PM MDT	Severe Thunderstorm Warning	RIW	Natrona	23 min
Jun 24, 9:13 PM MDT	Special Weather Statement	RIW		32 min
Jun 24, 9:16 PM MDT	Special Weather Statement	RIW	Hot Springs	29 min
Jun 24, 9:28 PM MDT	Special Weather Statement	RIW	Fremont	32 min
Jun 24, 9:33 PM MDT	Severe Thunderstorm Warning	RIW	Fremont	27 min
Jun 24, 9:46 PM MDT	Special Weather Statement	RIW	Hot Springs	44 min
Jun 24, 9:54 PM MDT	Special Weather Statement	RIW	Hot Springs	36 min
Jun 24, 9:57 PM MDT	Severe Thunderstorm Warning	RIW	Fremont	33 min
Jun 24, 10:37 PM MDT	Special Weather Statement	RIW	Big Horn	23 min
Jun 24, 10:40 PM MDT	Special Weather Statement	RIW	Fremont	35 min
Jun 24, 11:02 PM MDT	Areal Flood Advisory	RIW	Fremont	3 hr
Jun 24, 11:07 PM MDT	Special Weather Statement	RIW		23 min
Jun 24, 11:31 PM MDT	Areal Flood Advisory	RIW	Fremont	3 hr
Jun 25, 11:12 AM MDT	Special Weather Statement	RIW		33 min
Jun 25, 11:23 AM MDT	Special Weather Statement	RIW	Sublette	37 min
Jun 25, 11:32 AM MDT	Severe Thunderstorm Warning	RIW	Sublette	28 min
Jun 25, 12:00 PM MDT	Severe Thunderstorm Warning	RIW	Sublette	45 min
Jun 25, 12:40 PM MDT	Special Weather Statement	RIW	Johnson	50 min
Jun 25, 12:45 PM MDT	Severe Thunderstorm Warning	RIW	Fremont, Sublette, Sweetwater	45 min
Jun 25, 12:53 PM MDT	Special Weather Statement	RIW	Fremont	22 min
Jun 25, 1:02 PM MDT	Special Weather Statement	RIW	Hot Springs	43 min
Jun 25, 1:09 PM MDT	Special Weather Statement	RIW		51 min
Jun 25, 1:12 PM MDT	Severe Thunderstorm Warning	RIW	Fremont	48 min
Jun 25, 1:22 PM MDT	Severe Thunderstorm Warning	RIW	Natrona	23 min
Jun 25, 1:24 PM MDT	Special Weather Statement	RIW	Natrona	51 min
Jun 25, 1:30 PM MDT	Special Weather Statement	RIW	Washakie	45 min
Jun 25, 1:36 PM MDT	Severe Thunderstorm Warning	RIW	Fremont, Sweetwater	39 min
Jun 25, 1:38 PM MDT	Severe Thunderstorm Warning	RIW	Fremont, Hot Springs, Natrona, Washakie	52 min
Jun 25, 1:40 PM MDT	Severe Thunderstorm Warning	RIW	Natrona	35 min
Jun 25, 1:49 PM MDT	Tornado Warning	RIW	Fremont	41 min
Jun 25, 1:52 PM MDT	Special Weather Statement	RIW	Natrona	38 min
Jun 25, 1:59 PM MDT	Severe Thunderstorm Warning	RIW	Natrona	46 min
Jun 25, 2:00 PM MDT	Special Weather Statement	RIW	Sweetwater	30 min
Jun 25, 2:10 PM MDT	Severe Thunderstorm Warning Considerable damage threat	RIW	Natrona	50 min
Jun 25, 2:11 PM MDT	Severe Thunderstorm Warning	RIW	Fremont, Sweetwater	49 min
Jun 25, 2:16 PM MDT	Special Weather Statement	RIW	Johnson	29 min
Jun 25, 2:19 PM MDT	Special Weather Statement	RIW	Sweetwater	41 min
Jun 25, 2:39 PM MDT	Areal Flood Advisory	RIW	Natrona	3 hr
Jun 25, 2:40 PM MDT	Special Weather Statement	RIW	Johnson	35 min
Jun 25, 2:45 PM MDT	Special Weather Statement	RIW		30 min
Jun 25, 2:48 PM MDT	Severe Thunderstorm Warning	RIW	Sweetwater	42 min
Jun 25, 2:52 PM MDT	Severe Thunderstorm Warning Considerable damage threat	RIW	Natrona	68 min
Jun 25, 3:13 PM MDT	Special Weather Statement	RIW	Johnson	32 min
Jun 25, 3:33 PM MDT	Special Weather Statement	RIW		27 min
Jun 25, 4:48 PM MDT	Special Weather Statement	RIW	Sweetwater	42 min
Jun 25, 5:10 PM MDT	Special Weather Statement	RIW	Park	35 min
Jun 25, 5:40 PM MDT	Special Weather Statement	RIW		50 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.