Alert archive / Utah / Mesoscale Discussions in 2003

Mesoscale Discussion 1423

June 20, 20036 counties in Colorado; 8 counties in Utah; 6 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jun 20, 2003, 12:17 PM MDT for 6 counties in Colorado; 8 counties in Utah; 6 counties in Wyoming. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Jun 20, 2003, 12:17 PM MDT (18:17 UTC)
Expired: Jun 20, 2003, 2:15 PM MDT
In force: 118 min
Issued by: the Storm Prediction Center

Counties Garfield County, CO, Mesa County, CO, Moffat County, CO, Montrose County, CO, Rio Blanco County, CO, San Miguel County, CO, Carbon County, UT, Daggett County, UT, Duchesne County, UT, Emery County, UT, Grand County, UT, Summit County, UT, Uintah County, UT, Wasatch County, UT, Fremont County, WY, Hot Springs County, WY, Lincoln County, WY, Sublette County, WY, Sweetwater County, WY, Uinta County, WY

The radar

The Riverton/Lander radar (KRIW), 218 km from the middle of the area, began a volume at 18:18 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

Salt Lake City I, UT (KSLC), launched 12:00Z, 6.3 hours before the alert went out and 223 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: 3 J/kg
Mixed-layer CIN: -318 J/kg
Mixed-layer LCL: 3115 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 152 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, 12:45 PM MDT	Tornado Watch	SPC	Adams, Arapahoe, Baca, Bent, Cheyenne, Crowley and 18 more	7 hr
Jun 20, 2:53 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Bent, Cheyenne, Crowley, Elbert and 8 more	97 min
Jun 20, 11:36 AM MDT	Mesoscale Discussion	SPC	Park, Teton	114 min
Jun 20, 1:41 PM MDT	Mesoscale Discussion	SPC	Albany, Goshen, Laramie, Platte	2 hr
Jun 20, 2:25 PM MDT	Severe Thunderstorm Watch	SPC	Campbell, Crook, Goshen, Laramie, Niobrara, Platte and 1 more	7 hr
Jun 20, 5:45 PM MDT	Mesoscale Discussion	SPC	Crook, Weston	60 min

Nearby

Mesoscale Discussions in Utah, 2003 Mesoscale Discussions in Colorado, 2003 Mesoscale Discussions in Wyoming, 2003 Every mesoscale discussion in 2003

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.