Alert archive / Michigan / Mesoscale Discussions in 2013

Mesoscale Discussion 1897

September 19, 20137 counties in Michigan; Ashland County, Iron County, Vilas County, Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Sep 19, 2013, 1:28 PM EDT for 7 counties in Michigan; Ashland County, Iron County, Vilas County, Wisconsin. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Sep 19, 2013, 1:28 PM EDT (17:28 UTC)
Expired: Sep 19, 2013, 3:00 PM EDT
In force: 92 min
Issued by: the Storm Prediction Center

Counties Baraga County, MI, Gogebic County, MI, Houghton County, MI, Iron County, MI, Keweenaw County, MI, Marquette County, MI, Ontonagon County, MI, Ashland County, WI, Iron County, WI, Vilas County, WI

The radar

The Marquette radar (KMQT), 155 km from the middle of the area, began a volume at 17:28 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

Green Bay/Straub, WI (KGRB), launched 12:00Z, 5.5 hours before the alert went out and 252 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: 1969 J/kg
Mixed-layer CIN: -71 J/kg
Mixed-layer LCL: 613 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 102 m²/s²
0-3 km storm-relative helicity: 176 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
Sep 19, 8:55 AM EDT	Mesoscale Discussion	SPC	Barron, Buffalo, Dunn, Pepin, Pierce, Polk and 1 more	3 hr
Sep 19, 9:47 AM EDT	Severe Thunderstorm Watch	SPC	Ashland, Barron, Bayfield, Burnett, Chippewa, Douglas and 11 more	5 hr
Sep 19, 11:38 AM EDT	Mesoscale Discussion	SPC	Barron, Buffalo, Burnett, Chippewa, Clark, Dunn and 13 more	97 min
Sep 19, 5:29 PM EDT	Mesoscale Discussion	SPC	Columbia, Dane, Dodge, Fond du Lac, Grant, Green and 15 more	91 min
Sep 19, 5:40 PM EDT	Severe Thunderstorm Watch	SPC	Columbia, Dane, Dodge, Fond du Lac, Green, Green Lake and 14 more	6 hr

Nearby

Mesoscale Discussions in Michigan, 2013 Mesoscale Discussions in Wisconsin, 2013 Every mesoscale discussion in 2013

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.