Alert archive / South Dakota / Mesoscale Discussions in 2004

Mesoscale Discussion 1679

July 14, 2004Carter County, Powder River County, Montana; 8 counties in South Dakota; 4 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jul 14, 2004, 9:07 PM MDT for Carter County, Powder River County, Montana; 8 counties in South Dakota; 4 counties in Wyoming. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: Jul 14, 2004, 9:07 PM MDT (03:07 UTC)
Expired: Jul 14, 2004, 10:00 PM MDT
In force: 53 min
Issued by: the Storm Prediction Center

Counties Carter County, MT, Powder River County, MT, Butte County, SD, Custer County, SD, Fall River County, SD, Harding County, SD, Lawrence County, SD, Meade County, SD, Oglala Lakota County, SD, Pennington County, SD, Campbell County, WY, Crook County, WY, Niobrara County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 135 km from the middle of the area, began a volume at 03:08 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

Rapid City, SD (KUNR), launched 00:00Z, 3.1 hours before the alert went out and 134 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: 2080 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 2050 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 101 m²/s²
0-3 km storm-relative helicity: 144 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 8.1

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
Jul 14, 6:49 PM MDT	Mesoscale Discussion	SPC	Carter, Powder River	86 min
Jul 14, 8:39 PM MDT	Mesoscale Discussion	SPC	Daniels, Richland, Roosevelt, Sheridan, Wibaux	96 min
Jul 15, 8:32 AM MDT	Mesoscale Discussion	SPC	Clay, Hanson, Hutchinson, Lincoln, McCook, Minnehaha and 3 more	118 min
Jul 15, 10:55 AM MDT	Mesoscale Discussion	SPC	Bon Homme, Charles Mix, Clay, Davison, Douglas, Hutchinson and 2 more	2 hr
Jul 15, 1:03 PM MDT	Mesoscale Discussion	SPC	Aurora, Bon Homme, Brule, Buffalo, Charles Mix, Davison and 7 more	2 hr
Jul 15, 2:00 PM MDT	Tornado Watch	SPC	Bon Homme, Charles Mix, Clay, Douglas, Hutchinson, Lincoln and 3 more	6 hr
Jul 15, 4:41 PM MDT	Mesoscale Discussion	SPC	Brookings, Clark, Codington, Day, Deuel, Grant and 10 more	94 min
Jul 15, 5:00 PM MDT	Severe Thunderstorm Watch	SPC	Clark, Codington, Day, Deuel, Grant, Hamlin and 2 more	5 hr
Jul 15, 1:53 PM MDT	Mesoscale Discussion	SPC	Albany, Goshen, Laramie, Platte	3 hr

Nearby

Mesoscale Discussions in South Dakota, 2004 Mesoscale Discussions in Wyoming, 2004 Mesoscale Discussions in Montana, 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.