Alert archive / South Dakota / Mesoscale Discussions in 2014

Mesoscale Discussion 1435

July 22, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Jul 22, 2014, 6:21 PM MDT for 4 states. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: Jul 22, 2014, 6:21 PM MDT (00:21 UTC)
Expired: Jul 22, 2014, 8:15 PM MDT
In force: 114 min
Issued by: the Storm Prediction Center

Counties Carter County, MT, Powder River County, MT, Adams County, ND, Bowman County, ND, Hettinger County, ND, Slope County, ND, Butte County, SD, Custer County, SD, Fall River County, SD, Harding County, SD, Lawrence County, SD, Meade County, SD, Oglala Lakota County, SD, Pennington County, SD, Perkins County, SD, Crook County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 146 km from the middle of the area, began a volume at 00:24 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 00:00Z, 0.4 hours before the alert went out and 148 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: 939 J/kg
Mixed-layer CIN: -137 J/kg
Mixed-layer LCL: 1873 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 87 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

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 22, 8:17 PM MDT	Mesoscale Discussion	SPC	Carter, Powder River	88 min
Jul 23, 2:35 PM MDT	Mesoscale Discussion	SPC	Lincoln, Mineral, Sanders	55 min
Jul 23, 4:09 PM MDT	Severe Thunderstorm Watch	SPC	Flathead, Granite, Lake, Lincoln, Mineral, Missoula and 2 more	5 hr
Jul 23, 2:19 AM MDT	Mesoscale Discussion	SPC	Bennett, Custer, Fall River, Oglala Lakota, Pennington	116 min
Jul 23, 2:15 PM MDT	Mesoscale Discussion	SPC	Fall River	60 min

Nearby

Mesoscale Discussions in South Dakota, 2014 Mesoscale Discussions in North Dakota, 2014 Mesoscale Discussions in Montana, 2014 Every mesoscale discussion in 2014

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.