Alert archive / Iowa / Mesoscale Discussions in 2017

Mesoscale Discussion 1187

June 29, 201713 counties in Iowa

The Storm Prediction Center issued this mesoscale discussion at Jun 29, 2017, 3:48 PM CDT for 13 counties in Iowa. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: Jun 29, 2017, 3:48 PM CDT (20:48 UTC)
Expired: Jun 29, 2017, 5:45 PM CDT
In force: 117 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Clayton County, IA, Delaware County, IA, Fayette County, IA, Franklin County, IA, Grundy County, IA, Hamilton County, IA, Hardin County, IA, Webster County, IA, Wright County, IA

The radar

The Des Moines radar (KDMX), 107 km from the middle of the area, began a volume at 20:48 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

Davenport, (KDVN), launched 12:00Z, 8.8 hours before the alert went out and 237 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: 27 J/kg
Mixed-layer CIN: -369 J/kg
Mixed-layer LCL: 968 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 163 m²/s²
0-3 km storm-relative helicity: 175 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
Jun 28, 7:53 PM CDT	Mesoscale Discussion	SPC	Clinton, Dubuque, Jackson, Jones, Linn	97 min
Jun 28, 8:39 PM CDT	Mesoscale Discussion	SPC	Decatur, Ringgold, Taylor	96 min
Jun 29, 2:26 PM CDT	Mesoscale Discussion	SPC	Plymouth	94 min
Jun 29, 3:42 PM CDT	Severe Thunderstorm Watch	SPC	Audubon, Buena Vista, Calhoun, Carroll, Cass, Cherokee and 18 more	8 hr
Jun 29, 6:08 PM CDT	Mesoscale Discussion	SPC	Audubon, Buena Vista, Carroll, Cass, Cherokee, Clay and 13 more	67 min

Nearby

Mesoscale Discussions in Iowa, 2017 Every mesoscale discussion in 2017

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.