Alert archive / Wyoming / Mesoscale Discussions in 2004

Mesoscale Discussion 1356

June 20, 20044 states

The Storm Prediction Center issued this mesoscale discussion at Jun 20, 2004, 2:19 PM MDT for 4 states. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: Jun 20, 2004, 2:19 PM MDT (20:19 UTC)
Expired: Jun 20, 2004, 4:15 PM MDT
In force: 116 min
Issued by: the Storm Prediction Center

All 29 counties

Grand County, CO, Jackson County, CO, Larimer County, CO, Moffat County, CO, Routt County, CO, Bear Lake County, ID, Bonneville County, ID, Caribou County, ID, Fremont County, ID, Madison County, ID, Teton County, ID, Daggett County, UT, Albany County, WY, Big Horn County, WY, Campbell County, WY, Carbon County, WY, Converse County, WY, Fremont County, WY, Hot Springs County, WY, Johnson County, WY, Lincoln County, WY, Natrona County, WY, Park County, WY, Platte County, WY, Sublette County, WY, Sweetwater County, WY, Teton County, WY, Uinta County, WY, Washakie County, WY

The radar

The Riverton/Lander radar (KRIW), 21 km from the middle of the area, began a volume at 20:23 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, 8.3 hours before the alert went out and 16 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: 1038 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 169 m²/s²
0-3 km storm-relative helicity: 143 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 20, 12:48 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Boulder, Broomfield, Clear Creek, Denver and 9 more	117 min
Jun 20, 1:15 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Arapahoe, Baca, Bent, Broomfield, Cheyenne and 20 more	7 hr
Jun 20, 5:08 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Baca, Bent, Broomfield, Cheyenne and 20 more	2 hr
Jun 20, 4:13 PM MDT	Mesoscale Discussion	SPC	Goshen, Laramie, Platte	3 hr

Nearby

Mesoscale Discussions in Wyoming, 2004 Mesoscale Discussions in Idaho, 2004 Mesoscale Discussions in Colorado, 2004 Every mesoscale discussion in 2004

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.