Alert archive / South Dakota / Mesoscale Discussions in 2003

Mesoscale Discussion 1085

May 23, 20037 counties in Nebraska; 9 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 23, 2003, 4:48 PM CDT for 7 counties in Nebraska; 9 counties in South Dakota. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: May 23, 2003, 4:48 PM CDT (21:48 UTC)
Expired: May 23, 2003, 5:45 PM CDT
In force: 57 min
Issued by: the Storm Prediction Center

Counties Boyd County, NE, Brown County, NE, Garfield County, NE, Holt County, NE, Keya Paha County, NE, Loup County, NE, Rock County, NE, Gregory County, SD, Haakon County, SD, Jackson County, SD, Jones County, SD, Lyman County, SD, Mellette County, SD, Stanley County, SD, Todd County, SD, Tripp County, SD

The radar

The North Platte radar (KLNX), 156 km from the middle of the area, began a volume at 21:49 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.

Severe Thunderstorm Watch 422May 23, 5:25 PM CDT

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 9.8 hours before the alert went out and 198 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: 1422 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 130 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 22, 8:48 PM CDT	Mesoscale Discussion	SPC	Arthur, Chase, Dawson, Dundy, Frontier, Furnas and 9 more	87 min
May 23, 2:54 PM CDT	Mesoscale Discussion	SPC	Banner, Box Butte, Cheyenne, Dawes, Garden, Kimball and 4 more	2 hr
May 23, 5:25 PM CDT	Severe Thunderstorm Watch	SPC	Cherry, Grant, Hooker, Sheridan, Thomas	6 hr
May 23, 6:50 PM CDT	Mesoscale Discussion	SPC	Cherry, Grant, Hooker, Sheridan, Thomas	85 min

Nearby

Mesoscale Discussions in South Dakota, 2003 Mesoscale Discussions in Nebraska, 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.