Alert archive / Minnesota / Mesoscale Discussions in 2018

Mesoscale Discussion 1084

July 19, 2018Hancock County, Kossuth County, Winnebago County, Iowa; 8 counties in Minnesota

The Storm Prediction Center issued this mesoscale discussion at Jul 19, 2018, 1:27 PM CDT for Hancock County, Kossuth County, Winnebago County, Iowa; 8 counties in Minnesota. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued: Jul 19, 2018, 1:27 PM CDT (18:27 UTC)
Expired: Jul 19, 2018, 2:30 PM CDT
In force: 63 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

Counties Hancock County, IA, Kossuth County, IA, Winnebago County, IA, Blue Earth County, MN, Brown County, MN, Faribault County, MN, Martin County, MN, Nicollet County, MN, Sibley County, MN, Waseca County, MN, Watonwan County, MN

The radar

The Minneapolis radar (KMPX), 121 km from the middle of the area, began a volume at 18:29 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

Minneapolis, MN (KMPX), launched 12:00Z, 6.5 hours before the alert went out and 120 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: 184 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 1073 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 42 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 19, 12:47 AM CDT	Mesoscale Discussion	SPC	Fremont, Mills	118 min
Jul 19, 1:00 AM CDT	Severe Thunderstorm Watch	SPC	Fremont, Mills, Page	5 hr
Jul 19, 2:32 PM CDT	Mesoscale Discussion	SPC	Appanoose, Boone, Clarke, Dallas, Davis, Decatur and 13 more	118 min
Jul 19, 3:11 PM CDT	Tornado Watch	SPC	Appanoose, Benton, Davis, Grundy, Hardin, Henry and 21 more	6 hr
Jul 19, 5:18 PM CDT	Mesoscale Discussion	SPC	Appanoose, Benton, Black Hawk, Cedar, Clinton, Davis and 27 more	57 min
Jul 19, 6:26 PM CDT	Mesoscale Discussion	SPC	Des Moines, Lee	64 min

Nearby

Mesoscale Discussions in Minnesota, 2018 Mesoscale Discussions in Iowa, 2018 Every mesoscale discussion in 2018

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.