Alert archive / Wyoming / Mesoscale Discussions in 2020

Mesoscale Discussion 767

May 30, 20204 states

The Storm Prediction Center issued this mesoscale discussion at May 30, 2020, 1:45 PM MDT for 4 states. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: May 30, 2020, 1:45 PM MDT (19:45 UTC)
Expired: May 30, 2020, 3:15 PM MDT
In force: 90 min
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch unlikely
Chance of a watch: 5%

All 21 counties

Larimer County, CO, Clark County, ID, Fremont County, ID, Madison County, ID, Teton County, ID, Carbon County, MT, Gallatin County, MT, Madison County, MT, Park County, MT, Albany County, WY, Big Horn County, WY, Converse County, WY, Fremont County, WY, Hot Springs County, WY, Johnson County, WY, Laramie County, WY, Natrona County, WY, Park County, WY, Platte County, WY, Teton County, WY, Washakie County, WY

The radar

The Riverton/Lander radar (KRIW), 31 km from the middle of the area, began a volume at 19:47 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

Riverton, WY (KRIW), launched 12:00Z, 7.8 hours before the alert went out and 32 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: 1995 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 101 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
May 29, 6:08 PM MDT	Mesoscale Discussion	SPC	Logan	97 min
May 30, 5:22 PM MDT	Severe Thunderstorm Watch	SPC	Benewah, Bonner, Boundary, Kootenai, Latah, Lewis and 2 more	5 hr
May 30, 5:00 PM MDT	Mesoscale Discussion	SPC	Broadwater, Cascade, Granite, Jefferson, Lewis and Clark, Meagher and 3 more	90 min

Nearby

Mesoscale Discussions in Wyoming, 2020 Mesoscale Discussions in Idaho, 2020 Mesoscale Discussions in Montana, 2020 Every mesoscale discussion in 2020

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.