Alert archive / North Dakota / Mesoscale Discussions in 2018

Mesoscale Discussion 1004

July 4, 20187 counties in Minnesota; 35 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 4, 2018, 12:49 AM CDT for 7 counties in Minnesota; 35 counties in North Dakota. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: Jul 4, 2018, 12:49 AM CDT (05:49 UTC)
Expired: Jul 4, 2018, 2:45 AM CDT
In force: 116 min
Issued by: the Storm Prediction Center

All 42 counties

Clay County, MN, Marshall County, MN, Norman County, MN, Pennington County, MN, Polk County, MN, Red Lake County, MN, Wilkin County, MN, Barnes County, ND, Benson County, ND, Burleigh County, ND, Cass County, ND, Dunn County, ND, Eddy County, ND, Emmons County, ND, Foster County, ND, Grand Forks County, ND, Grant County, ND, Griggs County, ND, Hettinger County, ND, Kidder County, ND, LaMoure County, ND, Logan County, ND, McHenry County, ND, McLean County, ND, Mercer County, ND, Morton County, ND, Mountrail County, ND, Nelson County, ND, Oliver County, ND, Pierce County, ND, Ramsey County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Sheridan County, ND, Stark County, ND, Steele County, ND, Stutsman County, ND, Traill County, ND, Walsh County, ND, Ward County, ND, Wells County, ND

The radar

The Minot AFB radar (KMBX), 97 km from the middle of the area, began a volume at 05:52 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 263Jul 4, 1:30 AM CDT

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 5.8 hours before the alert went out and 109 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: 1282 J/kg
Mixed-layer CIN: -119 J/kg
Mixed-layer LCL: 1250 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 150 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 4.6

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 4, 1:34 AM CDT	Severe Thunderstorm Watch	SPC	Becker, Beltrami, Clay, Clearwater, Hubbard, Kittson and 11 more	7 hr
Jul 4, 3:14 AM CDT	Mesoscale Discussion	SPC	Big Stone, Traverse	91 min
Jul 4, 7:10 AM CDT	Mesoscale Discussion	SPC	Aitkin, Carlton, Cass, Crow Wing, Itasca, Koochiching and 1 more	95 min
Jul 4, 9:56 AM CDT	Mesoscale Discussion	SPC	Cook, Dodge, Fillmore, Houston, Lake, Mower and 3 more	2 hr
Jul 4, 10:27 AM CDT	Mesoscale Discussion	SPC	Freeborn, Mower	2 hr
Jul 3, 9:13 PM CDT	Mesoscale Discussion	SPC	Adams, Billings, Bowman, Dunn, Golden Valley, Hettinger and 4 more	2 hr
Jul 3, 9:39 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Billings, Bottineau, Bowman, Burke, Burleigh and 30 more	6 hr

Nearby

Mesoscale Discussions in North Dakota, 2018 Mesoscale Discussions in Minnesota, 2018 Every mesoscale discussion in 2018

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.