Alert archive / South Dakota / Mesoscale Discussions in 2003

Mesoscale Discussion 1873

July 17, 20036 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 17, 2003, 10:15 PM MDT for 6 counties in South Dakota. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Jul 17, 2003, 10:15 PM MDT (04:15 UTC)
Expired: Jul 17, 2003, 11:45 PM MDT
In force: 90 min
Issued by: the Storm Prediction Center

Counties Butte County, SD, Harding County, SD, Lawrence County, SD, Meade County, SD, Pennington County, SD, Perkins County, SD

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 4.3 hours before the alert went out and 103 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: 2273 J/kg
Mixed-layer CIN: -197 J/kg
Mixed-layer LCL: 1551 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: -51 m²/s²
0-3 km storm-relative helicity: -28 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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 17, 6:19 PM MDT	Mesoscale Discussion	SPC	Bennett, Todd	116 min
Jul 17, 6:41 PM MDT	Mesoscale Discussion	SPC	Harding, Perkins, Ziebach	94 min
Jul 17, 8:05 PM MDT	Severe Thunderstorm Watch	SPC	Butte, Harding, Lawrence, Meade, Pennington, Perkins	5 hr
Jul 18, 3:30 PM MDT	Mesoscale Discussion	SPC	Butte, Custer, Fall River, Harding, Lawrence, Meade and 3 more	90 min
Jul 18, 3:45 PM MDT	Severe Thunderstorm Watch	SPC	Butte, Custer, Fall River, Harding, Lawrence, Meade and 3 more	5 hr

Nearby

Mesoscale Discussions in South Dakota, 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.