Alert archive / Wisconsin / Mesoscale Discussions in 2007

Mesoscale Discussion 1222

June 20, 200724 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jun 20, 2007, 7:25 PM CDT for 24 counties in Wisconsin. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued: Jun 20, 2007, 7:25 PM CDT (00:25 UTC)
Expired: Jun 20, 2007, 9:00 PM CDT
In force: 95 min
Issued by: the Storm Prediction Center

All 24 counties

Adams County, WI, Barron County, WI, Buffalo County, WI, Chippewa County, WI, Clark County, WI, Dunn County, WI, Eau Claire County, WI, Green Lake County, WI, Jackson County, WI, Juneau County, WI, Marathon County, WI, Marquette County, WI, Monroe County, WI, Pepin County, WI, Pierce County, WI, Polk County, WI, Portage County, WI, Saint Croix County, WI, Taylor County, WI, Trempealeau County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI

The radar

The La Crosse radar (KARX), 94 km from the middle of the area, began a volume at 00:27 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, 0.4 hours before the alert went out and 198 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: 781 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 1814 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 199 m²/s²
0-3 km storm-relative helicity: 290 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 6.5

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
Jun 21, 9:57 AM CDT	Mesoscale Discussion	SPC	Columbia, Crawford, Dane, Grant, Green, Iowa and 11 more	33 min
Jun 21, 11:55 AM CDT	Mesoscale Discussion	SPC	Buffalo, Crawford, Grant, Iowa, Jackson, Juneau and 7 more	50 min
Jun 21, 11:59 AM CDT	Severe Thunderstorm Watch	SPC	Buffalo, Crawford, Grant, La Crosse, Monroe, Richland and 2 more	8 hr
Jun 21, 12:27 PM CDT	Mesoscale Discussion	SPC	Columbia, Dane, Dodge, Green, Iowa, Jefferson and 4 more	63 min
Jun 21, 2:13 PM CDT	Mesoscale Discussion	SPC	Buffalo, Crawford, Grant, La Crosse, Monroe, Pierce and 3 more	62 min
Jun 21, 3:25 PM CDT	Mesoscale Discussion	SPC	Buffalo, Crawford, Grant, Iowa, Jackson, La Crosse and 5 more	35 min
Jun 21, 5:42 PM CDT	Mesoscale Discussion	SPC	Crawford, Grant, Green, Iowa, Lafayette, Richland and 1 more	93 min
Jun 21, 6:47 PM CDT	Severe Thunderstorm Watch	SPC	Crawford, Dane, Grant, Green, Iowa, Lafayette and 2 more	4 hr

Nearby

Mesoscale Discussions in Wisconsin, 2007 Every mesoscale discussion in 2007

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.