Alert archive / Wyoming / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 31, NWS Riverton, WY

June 13, 2013Big Horn County, Park County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Jun 13, 2013, 6:09 PM MDT for Big Horn County, Park County, Wyoming. It was in force for 36 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 13, 2013, 6:09 PM MDT (00:09 UTC)
Expired: Jun 13, 2013, 6:45 PM MDT
In force: 36 min
Issued by: NWS Riverton, WY
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Big Horn County, WY, Park County, WY

The radar

The Billings radar (KBLX), 149 km from the middle of the area, began a volume at 00:12 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 13, 1:06 PM MDT	Severe Thunderstorm Watch	SPC	12 hr

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 0.2 hours before the alert went out and 444 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: 159 J/kg
Mixed-layer CIN: -208 J/kg
Mixed-layer LCL: 1608 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 85 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 13, 2:54 PM MDT, 3 hours 15 minutes earlier.

Area forecast discussion, Jun 13, 2:54 PM MDT, 3 hours 15 minutes before

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Hazardous weather outlook, Jun 13, 3:08 PM MDT, 3 hours 1 minute before

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In the hours before

Special weather statement, Jun 13, 4:53 PM MDT, 1 hour 16 minutes before

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Special weather statement, Jun 13, 4:58 PM MDT, 1 hour 11 minutes before

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Special weather statement, Jun 13, 5:04 PM MDT, 1 hour 5 minutes before

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Special weather statement, Jun 13, 5:33 PM MDT, 36 minutes before

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Special weather statement, Jun 13, 5:35 PM MDT, 34 minutes before

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Special weather statement, Jun 13, 5:44 PM MDT, 25 minutes before

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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 13, 6:20 PM MDT	Special Weather Statement	RIW		40 min
Jun 13, 6:26 PM MDT	Severe Thunderstorm Warning	RIW	Johnson, Natrona	49 min
Jun 13, 6:57 PM MDT	Special Weather Statement	RIW		33 min
Jun 13, 8:05 PM MDT	Special Weather Statement	RIW	Teton	40 min
Jun 13, 8:10 PM MDT	Special Weather Statement	RIW	Park	50 min
Jun 13, 8:36 PM MDT	Severe Thunderstorm Warning	RIW	Teton	24 min
Jun 13, 9:00 PM MDT	Severe Thunderstorm Warning	RIW	Fremont, Park, Teton	45 min
Jun 13, 9:51 PM MDT	Severe Thunderstorm Warning	RIW	Park	24 min
Jun 13, 10:12 PM MDT	Severe Thunderstorm Warning	RIW	Big Horn, Park	63 min
Jun 13, 10:58 PM MDT	Special Weather Statement	RIW	Fremont	47 min
Jun 13, 11:20 PM MDT	Special Weather Statement	RIW	Big Horn	40 min
Jun 14, 2:22 AM MDT	Special Weather Statement	RIW	Big Horn	38 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2013 Every severe thunderstorm warning in 2013

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.