Alert archive / Minnesota / Mesoscale Discussions in 2014

Mesoscale Discussion 1425

July 21, 201422 counties in Minnesota; 4 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 21, 2014, 11:44 PM CDT for 22 counties in Minnesota; 4 counties in Wisconsin. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Jul 21, 2014, 11:44 PM CDT (04:44 UTC)
Expired: Jul 22, 2014, 1:15 AM CDT
In force: 91 min
Issued by: the Storm Prediction Center

All 26 counties

Aitkin County, MN, Anoka County, MN, Benton County, MN, Carlton County, MN, Cass County, MN, Chisago County, MN, Cook County, MN, Crow Wing County, MN, Isanti County, MN, Itasca County, MN, Kanabec County, MN, Koochiching County, MN, Lake County, MN, Mille Lacs County, MN, Morrison County, MN, Pine County, MN, Pope County, MN, Saint Louis County, MN, Sherburne County, MN, Stearns County, MN, Todd County, MN, Wright County, MN, Burnett County, WI, Douglas County, WI, Polk County, WI, Washburn County, WI

The radar

The Duluth radar (KDLH), 45 km from the middle of the area, began a volume at 04:45 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 429Jul 22, 1:20 AM CDT

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 4.7 hours before the alert went out and 222 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: 3234 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 1331 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 98 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.2

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 21, 8:47 PM CDT	Mesoscale Discussion	SPC	Aitkin, Becker, Beltrami, Benton, Carlton, Cass and 23 more	58 min
Jul 21, 9:08 PM CDT	Mesoscale Discussion	SPC	Big Stone, Clay, Kittson, Mahnomen, Marshall, Norman and 6 more	97 min
Jul 21, 9:24 PM CDT	Severe Thunderstorm Watch	SPC	Aitkin, Becker, Beltrami, Benton, Carlton, Cass and 24 more	6 hr
Jul 22, 12:46 AM CDT	Mesoscale Discussion	SPC	Aitkin, Benton, Carlton, Chisago, Cook, Isanti and 6 more	59 min
Jul 22, 1:20 AM CDT	Severe Thunderstorm Watch	SPC	Ashland, Bayfield, Florence, Forest, Iron, Oneida and 4 more	6 hr
Jul 22, 4:10 AM CDT	Mesoscale Discussion	SPC	Iron, Oneida, Price, Sawyer, Vilas, Washburn	95 min
Jul 22, 5:54 PM CDT	Mesoscale Discussion	SPC	Dane, Dodge, Green, Jefferson, Kenosha, Milwaukee and 7 more	2 hr

Nearby

Mesoscale Discussions in Minnesota, 2014 Mesoscale Discussions in Wisconsin, 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.