Alert archive / South Dakota / Mesoscale Discussions in 2004

Mesoscale Discussion 848

May 23, 20044 counties in Montana; 5 counties in South Dakota; Crook County, Sheridan County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at May 23, 2004, 2:09 PM MDT for 4 counties in Montana; 5 counties in South Dakota; Crook County, Sheridan County, Wyoming. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 23, 2004, 2:09 PM MDT (20:09 UTC)
Expired: May 23, 2004, 4:15 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Carter County, MT, Custer County, MT, Powder River County, MT, Rosebud County, MT, Butte County, SD, Custer County, SD, Lawrence County, SD, Meade County, SD, Pennington County, SD, Crook County, WY, Sheridan County, WY

The radar

The Rapid City radar (KUDX), 157 km from the middle of the area, began a volume at 20:09 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 265May 23, 3:00 PM MDT

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 8.2 hours before the alert went out and 156 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: 525 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 94 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
May 23, 3:00 PM MDT	Tornado Watch	SPC	Carter, Powder River	5 hr
May 23, 5:50 PM MDT	Mesoscale Discussion	SPC	Carter, Powder River	85 min

Nearby

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