Alert archive / North Dakota / Mesoscale Discussions in 2020

Mesoscale Discussion 1249

July 17, 202013 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 17, 2020, 2:25 PM CDT for 13 counties in North Dakota. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: Jul 17, 2020, 2:25 PM CDT (19:25 UTC)
Expired: Jul 17, 2020, 4:00 PM CDT
In force: 95 min
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 379

Counties Benson County, ND, Cavalier County, ND, Eddy County, ND, McHenry County, ND, McLean County, ND, Nelson County, ND, Pembina County, ND, Pierce County, ND, Ramsey County, ND, Sheridan County, ND, Towner County, ND, Walsh County, ND, Wells County, ND

The radar

The Minot AFB radar (KMBX), 95 km from the middle of the area, began a volume at 19:27 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 380Jul 17, 5:35 PM CDT

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 7.4 hours before the alert went out and 188 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: 610 J/kg
Mixed-layer CIN: -328 J/kg
Mixed-layer LCL: 1524 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 213 m²/s²
0-3 km storm-relative helicity: 264 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.1

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 17, 12:10 PM CDT	Mesoscale Discussion	SPC	Bottineau, Burleigh, Dunn, Grant, Hettinger, McHenry and 14 more	95 min
Jul 17, 12:30 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Benson, Bottineau, Burleigh, Cavalier, Dunn and 26 more	10 hr
Jul 17, 3:47 PM CDT	Mesoscale Discussion	SPC	Grant, Hettinger, McLean, Mercer, Morton, Oliver	88 min
Jul 17, 5:09 PM CDT	Mesoscale Discussion	SPC	Barnes, Cass, Dickey, Foster, Grand Forks, Griggs and 6 more	2 hr
Jul 17, 5:39 PM CDT	Severe Thunderstorm Watch PDS	SPC	Barnes, Cass, Dickey, Griggs, LaMoure, Logan and 7 more	8 hr
Jul 17, 6:04 PM CDT	Mesoscale Discussion	SPC	Adams, Benson, Bottineau, Burleigh, Cavalier, Dunn and 31 more	116 min

Nearby

Mesoscale Discussions in North Dakota, 2020 Every mesoscale discussion in 2020

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.