Alert archive / Wyoming / Special Weather Statements in 2021

Special Weather Statement, NWS Riverton, WY

August 15, 2021Natrona County, Wyoming

NWS Riverton, WY issued this special weather statement at Aug 15, 2021, 6:22 PM MDT for Natrona County, Wyoming. It was in force for 23 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 15, 2021, 6:22 PM MDT (00:22 UTC)
Expired: Aug 15, 2021, 6:45 PM MDT
In force: 23 min
Issued by: NWS Riverton, WY
Hail: 0.50 in
Wind: 50

County Natrona County, WY

The radar

The Riverton/Lander radar (KRIW), 182 km from the middle of the area, began a volume at 00:25 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

Denver, CO (KDNR), launched 00:00Z, 0.4 hours before the alert went out and 412 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: 57 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 3276 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: 19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 15, 6:44 PM MDT	Special Weather Statement	RIW	Natrona	31 min
Aug 16, 2:24 AM MDT	Fire Weather Watch	RIW	Fremont, Hot Springs, Johnson, Lincoln, Natrona, Sublette and 3 more	11 hr
Aug 16, 2:24 AM MDT	Red Flag Warning	RIW	Fremont, Hot Springs, Park, Teton	19 hr
Aug 16, 1:50 PM MDT	Red Flag Warning	RIW	Fremont, Hot Springs, Johnson, Lincoln, Natrona, Sublette and 3 more	31 hr

Nearby

Special Weather Statements in Wyoming, 2021 Every special weather statement in 2021

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.