Alert archive / North Dakota / Mesoscale Discussions in 2015

Mesoscale Discussion 1369

July 11, 201529 counties in North Dakota; 4 counties in South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 11, 2015, 5:00 PM CDT for 29 counties in North Dakota; 4 counties in South Dakota. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Jul 11, 2015, 5:00 PM CDT (22:00 UTC)
Expired: Jul 11, 2015, 6:00 PM CDT
In force: 60 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 33 counties

Barnes County, ND, Benson County, ND, Bottineau County, ND, Burke County, ND, Burleigh County, ND, Dickey County, ND, Eddy County, ND, Emmons County, ND, Foster County, ND, Griggs County, ND, Kidder County, ND, LaMoure County, ND, Logan County, ND, McHenry County, ND, McIntosh County, ND, McLean County, ND, Mountrail County, ND, Oliver County, ND, Pierce County, ND, Ramsey County, ND, Ransom County, ND, Renville County, ND, Rolette County, ND, Sargent County, ND, Sheridan County, ND, Stutsman County, ND, Towner County, ND, Ward County, ND, Wells County, ND, Brown County, SD, Campbell County, SD, Edmunds County, SD, McPherson County, SD

The radar

The Bismarck radar (KBIS), 70 km from the middle of the area, began a volume at 22:03 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 403Jul 11, 5:40 PM CDT

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 10.0 hours before the alert went out and 66 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: 841 J/kg
Mixed-layer CIN: -278 J/kg
Mixed-layer LCL: 1498 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 129 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 11, 5:40 PM CDT	Severe Thunderstorm Watch	SPC	Barnes, Benson, Bottineau, Burke, Burleigh, Cavalier and 30 more	7 hr

Nearby

Mesoscale Discussions in North Dakota, 2015 Mesoscale Discussions in South Dakota, 2015 Every mesoscale discussion in 2015

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.