Alert archive / North Dakota / Mesoscale Discussions in 2013

Mesoscale Discussion 689

May 18, 2013Clay County, Wilkin County, Minnesota; 5 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at May 18, 2013, 11:27 PM CDT for Clay County, Wilkin County, Minnesota; 5 counties in North Dakota. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: May 18, 2013, 11:27 PM CDT (04:27 UTC)
Expired: May 19, 2013, 12:30 AM CDT
In force: 63 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

Counties Clay County, MN, Wilkin County, MN, Barnes County, ND, Cass County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 81 km from the middle of the area, began a volume at 04:28 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 178May 18, 11:50 PM CDT

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 4.5 hours before the alert went out and 228 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: 43 J/kg
Mixed-layer CIN: -169 J/kg
Mixed-layer LCL: 2157 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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
May 18, 8:33 PM CDT	Mesoscale Discussion	SPC	Nobles, Rock	117 min
May 18, 11:49 PM CDT	Severe Thunderstorm Watch	SPC	Clay, Norman, Wilkin	4 hr
May 19, 2:32 AM CDT	Mesoscale Discussion	SPC	Clay, Norman, Wilkin	88 min
May 19, 11:30 AM CDT	Mesoscale Discussion	SPC	Blue Earth, Brown, Carver, Dakota, Dodge, Faribault and 14 more	90 min
May 19, 1:10 PM CDT	Tornado Watch	SPC	Anoka, Blue Earth, Brown, Carver, Chippewa, Chisago and 41 more	8 hr
May 19, 5:04 PM CDT	Mesoscale Discussion	SPC	Anoka, Benton, Big Stone, Blue Earth, Brown, Carver and 53 more	56 min
May 19, 5:25 PM CDT	Tornado Watch	SPC	Kanabec, Mille Lacs, Pine	5 hr
May 18, 10:14 PM CDT	Mesoscale Discussion	SPC	Barnes, Burleigh, Dickey, Eddy, Emmons, Foster and 15 more	61 min

Nearby

Mesoscale Discussions in North Dakota, 2013 Mesoscale Discussions in Minnesota, 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.