Alert archive / Minnesota / Mesoscale Discussions in 2007

Mesoscale Discussion 1744

August 13, 200718 counties in Minnesota

The Storm Prediction Center issued this mesoscale discussion at Aug 13, 2007, 12:11 PM CDT for 18 counties in Minnesota. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Aug 13, 2007, 12:11 PM CDT (17:11 UTC)
Expired: Aug 13, 2007, 1:45 PM CDT
In force: 94 min
Issued by: the Storm Prediction Center

Counties Benton County, MN, Big Stone County, MN, Chippewa County, MN, Douglas County, MN, Grant County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, McLeod County, MN, Meeker County, MN, Otter Tail County, MN, Pope County, MN, Renville County, MN, Stearns County, MN, Stevens County, MN, Swift County, MN, Todd County, MN, Traverse County, MN, Wright County, MN

The radar

The Minneapolis radar (KMPX), 172 km from the middle of the area, began a volume at 17:13 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 592Aug 13, 2:50 PM CDT

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 5.2 hours before the alert went out and 170 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: 2331 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 56 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
Aug 13, 2:18 PM CDT	Mesoscale Discussion	SPC	Becker, Benton, Blue Earth, Brown, Carver, Chippewa and 38 more	117 min
Aug 13, 2:57 PM CDT	Severe Thunderstorm Watch	SPC	Becker, Beltrami, Clay, Clearwater, Grant, Hubbard and 9 more	6 hr
Aug 13, 5:11 PM CDT	Mesoscale Discussion	SPC	Anoka, Benton, Blue Earth, Brown, Carver, Chippewa and 37 more	64 min
Aug 13, 6:59 PM CDT	Severe Thunderstorm Watch	SPC	Aitkin, Anoka, Benton, Brown, Carlton, Carver and 29 more	7 hr

Nearby

Mesoscale Discussions in Minnesota, 2007 Every mesoscale discussion in 2007

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.