Alert archive / South Dakota / Mesoscale Discussions in 2004

Mesoscale Discussion 1856

August 3, 20044 states

The Storm Prediction Center issued this mesoscale discussion at Aug 3, 2004, 1:53 PM MDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 3, 2004, 1:53 PM MDT (19:53 UTC)
Expired: Aug 3, 2004, 4:00 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Carter County, MT, Custer County, MT, Fallon County, MT, Powder River County, MT, Prairie County, MT, Wibaux County, MT, Adams County, ND, Bowman County, ND, Golden Valley County, ND, Slope County, ND, Butte County, SD, Custer County, SD, Harding County, SD, Lawrence County, SD, Meade County, SD, Pennington County, SD, Perkins County, SD, Campbell County, WY, Crook County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 147 km from the middle of the area, began a volume at 19:57 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 12:00Z, 7.9 hours before the alert went out and 149 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: 23 J/kg
Mixed-layer CIN: -432 J/kg
Mixed-layer LCL: 757 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: 44 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
Aug 2, 8:07 PM MDT	Mesoscale Discussion	SPC	Carter, Custer, Fallon, Powder River	53 min
Aug 2, 6:47 PM MDT	Mesoscale Discussion	SPC	Aurora, Bennett, Bon Homme, Brule, Buffalo, Charles Mix and 19 more	58 min
Aug 3, 1:02 AM MDT	Mesoscale Discussion	SPC	Aurora, Beadle, Bon Homme, Brule, Buffalo, Charles Mix and 17 more	118 min
Aug 3, 1:30 AM MDT	Mesoscale Discussion	SPC	Haakon, Hughes, Jones, Meade, Stanley, Ziebach	2 hr
Aug 3, 2:00 AM MDT	Severe Thunderstorm Watch	SPC	Buffalo, Haakon, Hughes, Hyde, Jones, Lyman and 4 more	5 hr
Aug 3, 4:04 AM MDT	Mesoscale Discussion	SPC	Buffalo, Haakon, Hughes, Hyde, Jones, Lyman and 2 more	116 min
Aug 3, 6:21 AM MDT	Mesoscale Discussion	SPC	Aurora, Beadle, Brule, Buffalo, Davison, Douglas and 17 more	54 min
Aug 3, 7:00 AM MDT	Severe Thunderstorm Watch	SPC	Aurora, Beadle, Brule, Buffalo, Davison, Douglas and 14 more	5 hr
Aug 3, 9:48 AM MDT	Mesoscale Discussion	SPC	Lincoln, Minnehaha, Moody, Turner	87 min

Nearby

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