Alert archive / Wisconsin / Mesoscale Discussions in 2004

Mesoscale Discussion 1737

July 19, 20047 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 19, 2004, 6:31 PM CDT for 7 counties in Wisconsin. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Jul 19, 2004, 6:31 PM CDT (23:31 UTC)
Expired: Jul 19, 2004, 8:00 PM CDT
In force: 89 min
Issued by: the Storm Prediction Center

Counties Forest County, WI, Langlade County, WI, Lincoln County, WI, Oneida County, WI, Price County, WI, Sawyer County, WI, Washburn County, WI

The radar

The Duluth radar (KDLH), 186 km from the middle of the area, began a volume at 23:35 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, 11.5 hours before the alert went out and 227 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: 50 J/kg
Mixed-layer CIN: -81 J/kg
Mixed-layer LCL: 966 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 77 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 19, 12:26 PM CDT	Mesoscale Discussion	SPC	Grant	3 hr
Jul 19, 1:40 PM CDT	Tornado Watch	SPC	Crawford, Grant, Iowa, Lafayette, Richland	5 hr
Jul 19, 3:26 PM CDT	Mesoscale Discussion	SPC	Crawford, Grant, Iowa, Lafayette, Richland	2 hr

Nearby

Mesoscale Discussions in Wisconsin, 2004 Every mesoscale discussion in 2004

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.