Alert archive / Wyoming / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 76, NWS Riverton, WY

September 17, 2013Fremont County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Sep 17, 2013, 3:16 PM MDT for Fremont County, Wyoming. It was in force for 44 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 17, 2013, 3:16 PM MDT (21:16 UTC)
Expired: Sep 17, 2013, 4:00 PM MDT
In force: 44 min
Issued by: NWS Riverton, WY
Area: Storm-based polygon
Hail: 1.0 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 21:17 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
Sep 17, 1:30 PM MDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Riverton, WY (KRIW), launched 12:00Z, 9.3 hours before the alert went out and 19 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: 271 J/kg
Mixed-layer CIN: -142 J/kg
Mixed-layer LCL: 2086 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 104 m²/s²
0-3 km storm-relative helicity: 96 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 Sep 17, 2:21 PM MDT, 55 minutes earlier.

Area forecast discussion, Sep 17, 2:21 PM MDT, 55 minutes before

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Hazardous weather outlook, Sep 17, 1:38 PM MDT, 1 hour 38 minutes before

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In the hours before

Special weather statement, Sep 17, 2:28 PM MDT, 48 minutes before

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Special weather statement, Sep 17, 2:33 PM MDT, 43 minutes before

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Special weather statement, Sep 17, 2:45 PM MDT, 31 minutes before

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Special weather statement, Sep 17, 2:48 PM MDT, 28 minutes before

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Special weather statement, Sep 17, 2:59 PM MDT, 17 minutes before

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Special weather statement, Sep 17, 3:11 PM MDT, 5 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
Sep 16, 6:16 PM MDT	Special Weather Statement	RIW	Sublette	29 min
Sep 16, 6:25 PM MDT	Special Weather Statement	RIW		35 min
Sep 16, 6:44 PM MDT	Special Weather Statement	RIW	Sublette	31 min
Sep 16, 6:48 PM MDT	Special Weather Statement	RIW	Fremont	27 min
Sep 16, 6:52 PM MDT	Special Weather Statement	RIW	Teton	38 min
Sep 17, 7:22 AM MDT	Special Weather Statement	RIW	Teton	53 min
Sep 17, 8:42 AM MDT	Special Weather Statement	RIW		63 min
Sep 17, 8:46 AM MDT	Special Weather Statement	RIW	Teton	59 min
Sep 17, 9:32 AM MDT	Special Weather Statement	RIW		58 min
Sep 17, 9:35 AM MDT	Special Weather Statement	RIW		40 min
Sep 17, 10:09 AM MDT	Special Weather Statement	RIW		51 min
Sep 17, 10:52 AM MDT	Special Weather Statement	RIW	Teton	53 min
Sep 17, 10:55 AM MDT	Special Weather Statement	RIW	Teton	65 min
Sep 17, 10:57 AM MDT	Special Weather Statement	RIW		48 min
Sep 17, 11:06 AM MDT	Special Weather Statement	RIW	Sweetwater	54 min
Sep 17, 11:15 AM MDT	Special Weather Statement	RIW	Sublette	45 min
Sep 17, 11:39 AM MDT	Special Weather Statement	RIW	Teton	51 min
Sep 17, 11:50 AM MDT	Special Weather Statement	RIW	Teton	40 min
Sep 17, 11:53 AM MDT	Special Weather Statement	RIW		52 min
Sep 17, 12:02 PM MDT	Special Weather Statement	RIW	Sublette	58 min
Sep 17, 12:05 PM MDT	Special Weather Statement	RIW	Sweetwater	55 min
Sep 17, 12:31 PM MDT	Special Weather Statement	RIW		59 min
Sep 17, 12:34 PM MDT	Special Weather Statement	RIW	Lincoln	56 min
Sep 17, 12:40 PM MDT	Special Weather Statement	RIW	Park	65 min
Sep 17, 12:45 PM MDT	Special Weather Statement	RIW	Sweetwater	60 min
Sep 17, 12:47 PM MDT	Special Weather Statement	RIW		58 min
Sep 17, 12:49 PM MDT	Severe Thunderstorm Warning	RIW	Fremont, Sublette	56 min
Sep 17, 12:52 PM MDT	Severe Thunderstorm Warning	RIW	Sweetwater	53 min
Sep 17, 12:57 PM MDT	Severe Thunderstorm Warning	RIW	Lincoln	63 min
Sep 17, 12:59 PM MDT	Severe Thunderstorm Warning	RIW	Lincoln, Sublette	61 min
Sep 17, 1:10 PM MDT	Special Weather Statement	RIW		65 min
Sep 17, 1:24 PM MDT	Special Weather Statement	RIW	Sublette	66 min
Sep 17, 1:43 PM MDT	Special Weather Statement	RIW	Park	62 min
Sep 17, 1:46 PM MDT	Special Weather Statement	RIW	Hot Springs	59 min
Sep 17, 1:48 PM MDT	Special Weather Statement	RIW		27 min
Sep 17, 1:50 PM MDT	Special Weather Statement	RIW		40 min
Sep 17, 2:08 PM MDT	Areal Flood Advisory	RIW	Lincoln, Sublette	112 min
Sep 17, 2:09 PM MDT	Special Weather Statement	RIW	Lincoln	66 min
Sep 17, 2:18 PM MDT	Special Weather Statement	RIW		57 min
Sep 17, 2:19 PM MDT	Special Weather Statement	RIW		56 min
Sep 17, 2:21 PM MDT	Severe Thunderstorm Warning	RIW	Lincoln, Sublette, Teton	54 min
Sep 17, 2:24 PM MDT	Severe Thunderstorm Warning	RIW	Fremont, Sublette, Teton	66 min
Sep 17, 2:28 PM MDT	Special Weather Statement	RIW	Lincoln	62 min
Sep 17, 2:33 PM MDT	Special Weather Statement	RIW	Fremont	42 min
Sep 17, 2:45 PM MDT	Special Weather Statement	RIW	Fremont	45 min
Sep 17, 2:48 PM MDT	Special Weather Statement	RIW		42 min
Sep 17, 2:50 PM MDT	Severe Thunderstorm Warning	RIW	Big Horn, Park	55 min
Sep 17, 2:59 PM MDT	Special Weather Statement	RIW	Teton	61 min
Sep 17, 3:11 PM MDT	Special Weather Statement	RIW	Fremont	49 min
Sep 17, 3:26 PM MDT	Special Weather Statement	RIW		64 min
Sep 17, 3:27 PM MDT	Special Weather Statement	RIW	Hot Springs	48 min
Sep 17, 3:29 PM MDT	Special Weather Statement	RIW		61 min
Sep 17, 3:44 PM MDT	Severe Thunderstorm Warning	RIW	Big Horn	61 min
Sep 17, 3:55 PM MDT	Special Weather Statement	RIW	Lincoln	65 min
Sep 17, 3:59 PM MDT	Special Weather Statement	RIW	Fremont	46 min
Sep 17, 4:01 PM MDT	Severe Thunderstorm Warning	RIW	Park, Teton	59 min
Sep 17, 4:04 PM MDT	Special Weather Statement	RIW		41 min
Sep 17, 4:08 PM MDT	Special Weather Statement	RIW	Teton	67 min
Sep 17, 4:16 PM MDT	Special Weather Statement	RIW	Lincoln	59 min
Sep 17, 4:18 PM MDT	Special Weather Statement	RIW	Hot Springs	27 min
Sep 17, 4:21 PM MDT	Special Weather Statement	RIW		54 min
Sep 17, 4:24 PM MDT	Special Weather Statement	RIW	Hot Springs	36 min
Sep 17, 4:34 PM MDT	Special Weather Statement	RIW	Big Horn	41 min
Sep 17, 4:36 PM MDT	Special Weather Statement	RIW	Sublette	54 min
Sep 17, 4:40 PM MDT	Special Weather Statement	RIW		50 min
Sep 17, 4:50 PM MDT	Special Weather Statement	RIW	Big Horn	40 min
Sep 17, 4:55 PM MDT	Special Weather Statement	RIW		65 min
Sep 17, 5:05 PM MDT	Special Weather Statement	RIW	Lincoln	40 min
Sep 17, 5:07 PM MDT	Special Weather Statement	RIW	Hot Springs	38 min
Sep 17, 5:17 PM MDT	Special Weather Statement	RIW	Lincoln	58 min
Sep 17, 5:26 PM MDT	Special Weather Statement	RIW	Fremont	49 min
Sep 17, 5:31 PM MDT	Special Weather Statement	RIW	Big Horn	44 min
Sep 17, 5:33 PM MDT	Special Weather Statement	RIW	Sublette	42 min
Sep 17, 5:41 PM MDT	Special Weather Statement	RIW	Sublette	49 min
Sep 17, 5:55 PM MDT	Special Weather Statement	RIW	Fremont	50 min
Sep 17, 5:58 PM MDT	Special Weather Statement	RIW		62 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.