Alert archive / Minnesota / Mesoscale Discussions in 2013

Mesoscale Discussion 1504

July 24, 201319 counties in Minnesota; 9 counties in North Dakota

The Storm Prediction Center issued this mesoscale discussion at Jul 24, 2013, 4:36 PM CDT for 19 counties in Minnesota; 9 counties in North Dakota. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: Jul 24, 2013, 4:36 PM CDT (21:36 UTC)
Expired: Jul 24, 2013, 6:30 PM CDT
In force: 114 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 28 counties

Becker County, MN, Beltrami County, MN, Cass County, MN, Clay County, MN, Clearwater County, MN, Hubbard County, MN, Kittson County, MN, Koochiching County, MN, Lake of the Woods County, MN, Mahnomen County, MN, Marshall County, MN, Norman County, MN, Otter Tail County, MN, Pennington County, MN, Polk County, MN, Red Lake County, MN, Roseau County, MN, Wadena County, MN, Wilkin County, MN, Barnes County, ND, Cass County, ND, Grand Forks County, ND, Griggs County, ND, Ransom County, ND, Richland County, ND, Steele County, ND, Traill County, ND, Walsh County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 112 km from the middle of the area, began a volume at 21:39 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, 9.6 hours before the alert went out and 209 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: 94 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 1156 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 72 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
Jul 24, 2:21 PM CDT	Mesoscale Discussion	SPC	McKenzie, Williams	84 min
Jul 24, 6:08 PM CDT	Mesoscale Discussion	SPC	Golden Valley	97 min

Nearby

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