Alert archive / Wisconsin / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 174

May 9, 2004Gogebic County, Ontonagon County, Michigan; 12 counties in Wisconsin

The Storm Prediction Center issued this severe thunderstorm watch at May 9, 2004, 6:15 PM CDT for Gogebic County, Ontonagon County, Michigan; 12 counties in Wisconsin. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued: May 9, 2004, 6:15 PM CDT (23:15 UTC)
Expired: May 10, 2004, 2:00 AM CDT
In force: 8 hr
Issued by: the Storm Prediction Center

Counties Gogebic County, MI, Ontonagon County, MI, Ashland County, WI, Barron County, WI, Bayfield County, WI, Douglas County, WI, Forest County, WI, Iron County, WI, Oneida County, WI, Price County, WI, Rusk County, WI, Sawyer County, WI, Vilas County, WI, Washburn County, WI

The radar

The Duluth radar (KDLH), 163 km from the middle of the area, began a volume at 23:15 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.

Warnings issued inside it

3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
May 9, 6:34 PM CDT	Severe Thunderstorm Warning	MPX	Barron, Dunn, Pepin	41 min
May 9, 7:21 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Rusk	54 min
May 9, 8:06 PM CDT	Severe Thunderstorm Warning	DLH	Douglas	39 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 11.3 hours before the alert went out and 265 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 524 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 184 m²/s²
0-3 km storm-relative helicity: 257 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 8, 8:46 PM CDT	Mesoscale Discussion	SPC	Clinton, Eaton, Genesee, Gratiot, Ingham, Ionia and 8 more	119 min
May 8, 9:55 PM CDT	Mesoscale Discussion	SPC	Allegan, Barry, Branch, Calhoun, Cass, Eaton and 15 more	2 hr
May 9, 9:35 AM CDT	Mesoscale Discussion	SPC	Barry, Branch, Calhoun, Cass, Eaton, Hillsdale and 8 more	55 min
May 9, 11:48 AM CDT	Mesoscale Discussion	SPC	Allegan, Barry, Bay, Berrien, Branch, Calhoun and 33 more	2 hr
May 9, 12:55 PM CDT	Severe Thunderstorm Watch	SPC	Allegan, Barry, Bay, Berrien, Branch, Calhoun and 35 more	6 hr
May 9, 2:46 PM CDT	Mesoscale Discussion	SPC	Allegan, Barry, Bay, Berrien, Branch, Calhoun and 35 more	89 min
May 9, 5:17 PM CDT	Mesoscale Discussion	SPC	Allegan, Barry, Bay, Berrien, Branch, Calhoun and 33 more	88 min
May 9, 6:50 PM CDT	Severe Thunderstorm Watch	SPC	Allegan, Barry, Berrien, Branch, Calhoun, Cass and 14 more	4 hr
May 9, 3:29 PM CDT	Mesoscale Discussion	SPC	Buffalo, Chippewa, Clark, Dunn, Eau Claire, Pepin and 4 more	91 min
May 9, 3:55 PM CDT	Tornado Watch	SPC	Barron, Buffalo, Dunn, Pepin, Pierce, Saint Croix	5 hr
May 9, 4:46 PM CDT	Mesoscale Discussion	SPC	Adams, Columbia, Crawford, Dane, Dodge, Fond du Lac and 18 more	59 min
May 9, 5:38 PM CDT	Mesoscale Discussion	SPC	Barron, Buffalo, Burnett, Chippewa, Clark, Douglas and 12 more	2 hr

Nearby

Severe Thunderstorm Watches in Wisconsin, 2004 Severe Thunderstorm Watches in Michigan, 2004 Every severe thunderstorm watch 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.