Alert archive / North Dakota / Mesoscale Discussions in 2013

Mesoscale Discussion 1329

July 6, 2013Wilkin County, Minnesota; 18 counties in North Dakota; Marshall County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 6, 2013, 12:55 PM CDT for Wilkin County, Minnesota; 18 counties in North Dakota; Marshall County, South Dakota. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: Jul 6, 2013, 12:55 PM CDT (17:55 UTC)
Expired: Jul 6, 2013, 3:30 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center
Chance of a watch: 80%

Counties Wilkin County, MN, Barnes County, ND, Cass 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, McIntosh County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Steele County, ND, Stutsman County, ND, Traill County, ND, Wells County, ND, Marshall County, SD

The radar

The Fargo/Grand Forks radar (KMVX), 104 km from the middle of the area, began a volume at 17:56 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 393Jul 6, 1:40 PM CDT

The nearest sounding before it

International Fa, MN (KINL), launched 12:00Z, 5.9 hours before the alert went out and 420 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: 76 J/kg
Mixed-layer CIN: -135 J/kg
Mixed-layer LCL: 1266 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 56 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 6, 1:42 PM CDT	Severe Thunderstorm Watch	SPC	Becker, Clay, Clearwater, Grant, Hubbard, Mahnomen and 8 more	8 hr
Jul 6, 3:23 PM CDT	Mesoscale Discussion	SPC	Becker, Clay, Mahnomen, Norman, Pennington, Polk and 2 more	67 min

Nearby

Mesoscale Discussions in North Dakota, 2013 Mesoscale Discussions in Minnesota, 2013 Mesoscale Discussions in South Dakota, 2013 Every mesoscale discussion in 2013

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.