Alert archive / Wisconsin / Severe Thunderstorm Watches in 2003
Severe Thunderstorm Watch 774
The Storm Prediction Center issued this severe thunderstorm watch at Jul 20, 2003, 4:25 PM CDT for 14 counties in Illinois; 4 counties in Indiana; 25 counties in Wisconsin. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 20, 2003, 4:25 PM CDT (21:25 UTC)
- Expired
- Jul 20, 2003, 9:00 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 43 counties
Boone County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Livingston County, IL, McHenry County, IL, Will County, IL, Winnebago County, IL, Jasper County, IN, Lake County, IN, Newton County, IN, Porter County, IN, Brown County, WI, Calumet County, WI, Columbia County, WI, Dane County, WI, Dodge County, WI, Fond du Lac County, WI, Green Lake County, WI, Jefferson County, WI, Kenosha County, WI, Manitowoc County, WI, Marquette County, WI, Milwaukee County, WI, Outagamie County, WI, Ozaukee County, WI, Portage County, WI, Racine County, WI, Rock County, WI, Shawano County, WI, Sheboygan County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI
The radar
The Milwaukee radar (KMKX), 45 km from the middle of the area, began a volume at 21:27 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.
Warnings issued inside it
2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 4:30 PM CDT | Severe Thunderstorm Warning | MKX | Fond du Lac, Green Lake | 60 min |
| Jul 20, 6:01 PM CDT | Severe Thunderstorm Warning | LOT | Cook | 19 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, 9.4 hours before the alert went out and 136 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.
- Mixed-layer CAPE
- 765 J/kg
- Mixed-layer CIN
- -74 J/kg
- Mixed-layer LCL
- 716 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 110 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.5
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 6:23 PM CDT | Mesoscale Discussion | SPC | Boone, Cook, DeKalb, DuPage, Grundy, Kane and 8 more | 97 min |
| Jul 20, 12:41 PM CDT | Mesoscale Discussion | SPC | Steuben | 64 min |
| Jul 20, 1:20 PM CDT | Severe Thunderstorm Watch | SPC | DeKalb, Steuben | 6 hr |
| Jul 20, 3:37 PM CDT | Mesoscale Discussion | SPC | Steuben | 113 min |
| Jul 20, 6:45 PM CDT | Severe Thunderstorm Watch | SPC | DeKalb, Elkhart, Kosciusko, LaGrange, LaPorte, Marshall and 5 more | 5 hr |
| Jul 20, 4:14 AM CDT | Mesoscale Discussion | SPC | Pierce | 3 hr |
| Jul 20, 1:16 PM CDT | Mesoscale Discussion | SPC | Ashland, Bayfield, Douglas, Florence, Iron, Vilas | 119 min |
| Jul 20, 1:55 PM CDT | Severe Thunderstorm Watch | SPC | Ashland, Bayfield, Door, Douglas, Florence, Forest and 8 more | 7 hr |
| Jul 20, 3:27 PM CDT | Mesoscale Discussion | SPC | Ashland, Bayfield, Door, Douglas, Florence, Forest and 8 more | 63 min |
| Jul 20, 6:47 PM CDT | Mesoscale Discussion | SPC | Ashland, Bayfield, Door, Douglas, Florence, Forest and 7 more | 88 min |
Nearby
Severe Thunderstorm Watches in Wisconsin, 2003Severe Thunderstorm Watches in Illinois, 2003Severe Thunderstorm Watches in Indiana, 2003Every severe thunderstorm watch in 2003
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.