Alert archive / Missouri / Mesoscale Discussions in 2016

Mesoscale Discussion 1722

September 19, 2016Appanoose County, Davis County, Wayne County, Iowa; 6 counties in Missouri

The Storm Prediction Center issued this mesoscale discussion at Sep 19, 2016, 5:47 PM CDT for Appanoose County, Davis County, Wayne County, Iowa; 6 counties in Missouri. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Sep 19, 2016, 5:47 PM CDT (22:47 UTC)
Expired: Sep 19, 2016, 7:45 PM CDT
In force: 118 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

Counties Appanoose County, IA, Davis County, IA, Wayne County, IA, Adair County, MO, Mercer County, MO, Putnam County, MO, Schuyler County, MO, Scotland County, MO, Sullivan County, MO

The radar

The Des Moines radar (KDMX), 155 km from the middle of the area, began a volume at 22:49 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.

Tornado Watch 485Sep 19, 6:25 PM CDT

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.8 hours before the alert went out and 243 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: 1974 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 117 m²/s²
0-3 km storm-relative helicity: 125 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
Sep 19, 2:02 PM CDT	Mesoscale Discussion	SPC	Appanoose, Benton, Buchanan, Cedar, Clarke, Clinton and 26 more	58 min
Sep 19, 2:31 PM CDT	Severe Thunderstorm Watch	SPC	Clayton	3 hr
Sep 19, 2:55 PM CDT	Tornado Watch	SPC	Appanoose, Benton, Buchanan, Cedar, Clinton, Davis and 24 more	4 hr
Sep 19, 5:07 PM CDT	Mesoscale Discussion	SPC	Allamakee, Appanoose, Benton, Black Hawk, Buchanan, Cedar and 37 more	113 min
Sep 19, 6:27 PM CDT	Tornado Watch	SPC	Caldwell, Daviess, Grundy, Harrison, Linn, Livingston and 4 more	4 hr

Nearby

Mesoscale Discussions in Missouri, 2016 Mesoscale Discussions in Iowa, 2016 Every mesoscale discussion in 2016

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.