Alert archive / North Dakota / Mesoscale Discussions in 2018

Mesoscale Discussion 536

May 27, 2018Fallon County, Wibaux County, Montana; 13 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at May 27, 2018, 12:29 AM MDT for Fallon County, Wibaux County, Montana; 13 counties in North Dakota. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: May 27, 2018, 12:29 AM MDT (06:29 UTC)
Expired: May 27, 2018, 3:00 AM MDT
In force: 3 hr
Issued by: the Storm Prediction Center

Counties Fallon County, MT, Wibaux County, MT, Adams County, ND, Billings County, ND, Bowman County, ND, Dunn County, ND, Golden Valley County, ND, Grant County, ND, Hettinger County, ND, McKenzie County, ND, Mercer County, ND, Morton County, ND, Oliver County, ND, Slope County, ND, Stark County, ND

The radar

The Bismarck radar (KBIS), 172 km from the middle of the area, began a volume at 06:29 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

Bismarck Municip, ND (KBIS), launched 00:00Z, 6.5 hours before the alert went out and 176 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: 311 J/kg
Mixed-layer CIN: -232 J/kg
Mixed-layer LCL: 2886 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 47 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
May 26, 9:13 PM MDT	Mesoscale Discussion	SPC	Custer, Dawson, Fallon, Garfield, McCone, Prairie and 4 more	2 hr

Nearby

Mesoscale Discussions in North Dakota, 2018 Mesoscale Discussions in Montana, 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.