Alert archive / Wisconsin / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 699

August 3, 200420 counties in Wisconsin

The Storm Prediction Center issued this severe thunderstorm watch at Aug 3, 2004, 4:45 PM CDT for 20 counties in Wisconsin. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Aug 3, 2004, 4:45 PM CDT (21:45 UTC)
Expired
Aug 3, 2004, 10:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center

Counties Columbia County, WI, Dane County, WI, Dodge County, WI, Fond du Lac County, WI, Green County, WI, Green Lake County, WI, Iowa County, WI, Jefferson County, WI, Kenosha County, WI, Lafayette County, WI, Marquette County, WI, Milwaukee County, WI, Ozaukee County, WI, Racine County, WI, Rock County, WI, Sauk County, WI, Sheboygan County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI

The radar

The Milwaukee radar (KMKX), 55 km from the middle of the area, began a volume at 21:47 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

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

IssuedProductOfficeCountiesLasted
Aug 3, 4:52 PM CDTTornado WarningMKXSauk23 min
Aug 3, 4:59 PM CDTTornado WarningMKXColumbia31 min
Aug 3, 5:15 PM CDTFlash Flood WarningMKXColumbia, Sauk3 hr
Aug 3, 5:16 PM CDTSevere Thunderstorm WarningMKXDodge44 min
Aug 3, 5:24 PM CDTTornado WarningMKXDodge66 min
Aug 3, 6:18 PM CDTSevere Thunderstorm WarningMKXDodge, Jefferson27 min
Aug 3, 6:33 PM CDTSevere Thunderstorm WarningMKXIowa, Sauk42 min
Aug 3, 7:15 PM CDTSevere Thunderstorm WarningMKXDane60 min
Aug 3, 7:54 PM CDTFlash Flood WarningMKXJefferson, Waukesha2 hr
Aug 3, 8:15 PM CDTSevere Thunderstorm WarningMKXDane, Jefferson60 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, 9.8 hours before the alert went out and 182 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-pSkew-T log-p diagram, Green Bay/Straub, WI at 12:00Z on 2004-08-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Green Bay/Straub, WI at 12:00Z on 2004-08-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 38 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
1004 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
38 m²/s²
0-3 km storm-relative helicity
126 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.

IssuedProductOfficeCountiesLasted
Aug 3, 2:25 PM CDTSevere Thunderstorm WatchSPCCrawford, Grant, Richland, Vernon5 hr
Aug 3, 5:07 PM CDTMesoscale DiscussionSPCCrawford, Grant, La Crosse, Richland, Vernon53 min
Aug 3, 6:34 PM CDTMesoscale DiscussionSPCGreen, Lafayette86 min
Aug 3, 6:43 PM CDTMesoscale DiscussionSPCCrawford, Grant, Richland32 min

Nearby

Severe Thunderstorm Watches in Wisconsin, 2004Every 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.