Alert archive / Wyoming / Severe Thunderstorm Warnings in 2005

Severe Thunderstorm Warning 59, NWS Riverton, WY

September 23, 2005Sweetwater County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Sep 23, 2005, 7:20 PM MDT for Sweetwater County, Wyoming. It was in force for 40 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: Sep 23, 2005, 7:20 PM MDT (01:20 UTC)
Expired: Sep 23, 2005, 8:00 PM MDT
In force: 40 min
Issued by: NWS Riverton, WY
Area: Counties, with a storm outline in the text

County Sweetwater County, WY

The radar

The Riverton/Lander radar (KRIW), 160 km from the middle of the area, began a volume at 01:23 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

Salt Lake City I, UT (KSLC), launched 00:00Z, 1.3 hours before the alert went out and 271 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: 3591 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 222 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 Sep 23, 3:01 PM MDT, 4 hours 19 minutes earlier.

Area forecast discussion, Sep 23, 3:01 PM MDT, 4 hours 19 minutes before

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Hazardous weather outlook, Sep 23, 5:00 AM MDT, 14 hours 20 minutes before

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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
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        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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The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 24, 4:31 PM MDT	Severe Thunderstorm Warning	RIW	Fremont	29 min
Sep 24, 4:58 PM MDT	Severe Thunderstorm Warning	RIW	Fremont	32 min
Sep 24, 5:28 PM MDT	Severe Thunderstorm Warning	RIW	Fremont	32 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2005 Every severe thunderstorm warning in 2005

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.