Alert archive / Wisconsin / Mesoscale Discussions in 2013

Mesoscale Discussion 722

May 20, 201312 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at May 20, 2013, 1:41 AM CDT for 12 counties in Wisconsin. It was in force for 79 min.

The area

The outline as issued.

The facts

Issued: May 20, 2013, 1:41 AM CDT (06:41 UTC)
Expired: May 20, 2013, 3:00 AM CDT
In force: 79 min
Issued by: the Storm Prediction Center

Counties Adams County, WI, Columbia County, WI, Dane County, WI, Dodge County, WI, Fond du Lac County, WI, Green County, WI, Green Lake County, WI, Jefferson County, WI, Marquette County, WI, Rock County, WI, Waushara County, WI, Winnebago County, WI

The radar

The Milwaukee radar (KMKX), 82 km from the middle of the area, began a volume at 06:44 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 00:00Z, 6.7 hours before the alert went out and 136 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: 117 J/kg
Mixed-layer CIN: -276 J/kg
Mixed-layer LCL: 1683 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 92 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
May 19, 7:46 PM CDT	Mesoscale Discussion	SPC	Adams, Columbia, Crawford, Dane, Grant, Green and 13 more	59 min
May 19, 8:10 PM CDT	Tornado Watch	SPC	Adams, Buffalo, Clark, Columbia, Crawford, Dane and 19 more	6 hr
May 19, 8:21 PM CDT	Mesoscale Discussion	SPC	Pierce, Saint Croix	54 min
May 19, 9:38 PM CDT	Mesoscale Discussion	SPC	Chippewa, Iron, Price, Rusk	67 min
May 19, 10:58 PM CDT	Mesoscale Discussion	SPC	Adams, Clark, Columbia, Crawford, Dane, Dodge and 20 more	62 min

Nearby

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.