Alert archive / Wyoming / Mesoscale Discussions in 2018

Mesoscale Discussion 653

June 6, 201810 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jun 6, 2018, 1:35 PM MDT for 10 counties in Wyoming. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued
Jun 6, 2018, 1:35 PM MDT (19:35 UTC)
Expired
Jun 6, 2018, 3:30 PM MDT
In force
115 min
Issued by
the Storm Prediction Center
Chance of a watch
40%

Counties Big Horn County, WY, Campbell County, WY, Converse County, WY, Fremont County, WY, Hot Springs County, WY, Johnson County, WY, Natrona County, WY, Platte County, WY, Sheridan County, WY, Washakie County, WY

The radar

The Riverton/Lander radar (KRIW), 123 km from the middle of the area, began a volume at 19:34 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, 7.6 hours before the alert went out and 117 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-pSkew-T log-p diagram, Riverton, WY at 12:00Z on 2018-06-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 549 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Riverton, WY at 12:00Z on 2018-06-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 68 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
549 J/kg
Mixed-layer CIN
-205 J/kg
Mixed-layer LCL
1849 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
68 m²/s²
0-3 km storm-relative helicity
96 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

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.

IssuedProductOfficeCountiesLasted
Jun 6, 4:46 PM MDTSevere Thunderstorm WatchSPCAlbany, Goshen, Laramie, Platte8 hr

Nearby

Mesoscale Discussions in Wyoming, 2018Every mesoscale discussion in 2018

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.