Alert archive / Wyoming / Mesoscale Discussions in 2024

Mesoscale Discussion 1306

June 17, 2024Carter County, Powder River County, Montana; 7 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jun 17, 2024, 2:45 PM MDT for Carter County, Powder River County, Montana; 7 counties in Wyoming. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Jun 17, 2024, 2:45 PM MDT (20:45 UTC)
Expired: Jun 17, 2024, 4:15 PM MDT
In force: 90 min
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch possible
Chance of a watch: 60%

Counties Carter County, MT, Powder River County, MT, Campbell County, WY, Converse County, WY, Crook County, WY, Johnson County, WY, Niobrara County, WY, Sheridan County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 173 km from the middle of the area, began a volume at 20:45 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 430Jun 17, 4:30 PM MDT

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 8.8 hours before the alert went out and 169 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: 2056 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: 123 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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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 17, 4:32 PM MDT	Severe Thunderstorm Watch	SPC	Carter, Custer, Fallon, Powder River	5 hr
Jun 17, 5:55 PM MDT	Mesoscale Discussion	SPC	Carter, Powder River	95 min
Jun 16, 7:38 PM MDT	Mesoscale Discussion	SPC	Goshen	2 hr

Nearby

Mesoscale Discussions in Wyoming, 2024 Mesoscale Discussions in Montana, 2024 Every mesoscale discussion in 2024

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.