Alert archive / South Dakota / Mesoscale Discussions in 2011

Mesoscale Discussion 1743

July 25, 201115 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 25, 2011, 9:33 PM CDT for 15 counties in South Dakota. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued: Jul 25, 2011, 9:33 PM CDT (02:33 UTC)
Expired: Jul 25, 2011, 10:30 PM CDT
In force: 57 min
Issued by: the Storm Prediction Center

Counties Beadle County, SD, Brookings County, SD, Buffalo County, SD, Hamlin County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Lyman County, SD, Miner County, SD, Moody County, SD, Sanborn County, SD, Sully County, SD

The radar

The Aberdeen radar (KABR), 118 km from the middle of the area, began a volume at 02:33 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

Aberdeen, SD (KABR), launched 00:00Z, 2.6 hours before the alert went out and 58 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: 2164 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: -41 m²/s²
0-3 km storm-relative helicity: 83 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
Jul 26, 10:45 AM CDT	Mesoscale Discussion	SPC	Campbell, Edmunds, Faulk, Hand, McPherson	60 min
Jul 26, 3:59 PM CDT	Mesoscale Discussion	SPC	Aurora, Beadle, Brown, Brule, Buffalo, Campbell and 27 more	2 hr
Jul 26, 5:06 PM CDT	Mesoscale Discussion	SPC	Mellette, Todd	84 min
Jul 26, 5:21 PM CDT	Tornado Watch	SPC	Brown, Buffalo, Campbell, Corson, Dewey, Edmunds and 12 more	5 hr
Jul 26, 5:43 PM CDT	Severe Thunderstorm Watch	SPC	Aurora, Beadle, Brule, Charles Mix, Douglas, Gregory and 4 more	7 hr

Nearby

Mesoscale Discussions in South Dakota, 2011 Every mesoscale discussion in 2011

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.