Alert archive / North Dakota / Mesoscale Discussions in 2014

Mesoscale Discussion 1746

September 20, 2014Clay County, Norman County, Polk County, Minnesota; 6 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Sep 20, 2014, 5:55 PM CDT for Clay County, Norman County, Polk County, Minnesota; 6 counties in North Dakota. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: Sep 20, 2014, 5:55 PM CDT (22:55 UTC)
Expired: Sep 20, 2014, 7:30 PM CDT
In force: 95 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

Counties Clay County, MN, Norman County, MN, Polk County, MN, Cass County, ND, Grand Forks County, ND, Pembina County, ND, Steele County, ND, Traill County, ND, Walsh County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 63 km from the middle of the area, began a volume at 22:56 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 nearest sounding before it

International Fa, MN (KINL), launched 12:00Z, 10.9 hours before the alert went out and 304 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 456 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Sep 20, 12:16 PM CDT	Mesoscale Discussion	SPC	Aitkin, Becker, Beltrami, Benton, Big Stone, Brown and 38 more	59 min
Sep 20, 1:26 PM CDT	Severe Thunderstorm Watch	SPC	Aitkin, Anoka, Becker, Beltrami, Benton, Big Stone and 58 more	6 hr
Sep 20, 3:57 PM CDT	Mesoscale Discussion	SPC	Aitkin, Anoka, Benton, Brown, Carver, Cass and 30 more	93 min
Sep 20, 5:23 PM CDT	Mesoscale Discussion	SPC	Blue Earth, Carver, Dakota, Dodge, Fillmore, Freeborn and 14 more	67 min
Sep 20, 5:42 PM CDT	Severe Thunderstorm Watch	SPC	Dodge, Fillmore, Houston, Mower, Olmsted, Wabasha and 1 more	3 hr

Nearby

Mesoscale Discussions in North Dakota, 2014 Mesoscale Discussions in Minnesota, 2014 Every mesoscale discussion in 2014

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.