Alert archive / Wisconsin / Mesoscale Discussions in 2007

Mesoscale Discussion 1590

July 26, 20079 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 26, 2007, 6:11 PM CDT for 9 counties in Wisconsin. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Jul 26, 2007, 6:11 PM CDT (23:11 UTC)
Expired: Jul 26, 2007, 7:45 PM CDT
In force: 94 min
Issued by: the Storm Prediction Center

Counties Chippewa County, WI, Clark County, WI, Eau Claire County, WI, Jackson County, WI, Marathon County, WI, Portage County, WI, Rusk County, WI, Taylor County, WI, Wood County, WI

The radar

The La Crosse radar (KARX), 128 km from the middle of the area, began a volume at 23:12 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, 11.2 hours before the alert went out and 201 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: 1156 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 727 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 90 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.9

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
Jul 26, 12:33 PM CDT	Mesoscale Discussion	SPC	Adams, Calumet, Columbia, Dodge, Fond du Lac, Forest and 19 more	87 min
Jul 26, 12:55 PM CDT	Mesoscale Discussion	SPC	Barron, Bayfield, Buffalo, Burnett, Chippewa, Douglas and 9 more	65 min
Jul 26, 1:16 PM CDT	Severe Thunderstorm Watch	SPC	Ashland, Barron, Bayfield, Burnett, Chippewa, Douglas and 11 more	8 hr
Jul 26, 3:43 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Buffalo, Calumet, Clark, Columbia and 35 more	7 hr
Jul 26, 4:05 PM CDT	Mesoscale Discussion	SPC	Ashland, Barron, Bayfield, Burnett, Chippewa, Douglas and 12 more	55 min

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.