Alert archive / Wisconsin / Severe Thunderstorm Watches in 2003
Severe Thunderstorm Watch 632
The Storm Prediction Center issued this severe thunderstorm watch at Jul 4, 2003, 5:20 AM CDT for 7 counties in Illinois; 20 counties in Wisconsin. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 4, 2003, 5:20 AM CDT (10:20 UTC)
- Expired
- Jul 4, 2003, 9:00 AM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
All 27 counties
Boone County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Kane County, IL, Lake County, IL, McHenry County, IL, Brown County, WI, Calumet County, WI, Dodge County, WI, Fond du Lac County, WI, Green Lake County, WI, Jefferson County, WI, Kenosha County, WI, Manitowoc County, WI, Milwaukee County, WI, Outagamie County, WI, Ozaukee County, WI, Racine County, WI, Rock 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), 66 km from the middle of the area, began a volume at 10:21 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 |
|---|---|---|---|---|
| Jul 4, 7:15 AM CDT | Severe Thunderstorm Warning | MKX | Milwaukee | 60 min |
| Jul 4, 7:18 AM CDT | Severe Thunderstorm Warning | LOT | Cook, Lake, McHenry | 27 min |
| Jul 4, 7:21 AM CDT | Severe Thunderstorm Warning | MKX | Kenosha, Racine | 54 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 00:00Z, 10.3 hours before the alert went out and 119 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
- 1555 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 1449 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- 104 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.8
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 1:15 AM CDT | Severe Thunderstorm Watch | SPC | Carroll, Jo Daviess, Lee, Ogle, Rock Island, Stephenson and 2 more | 6 hr |
| Jul 4, 3:27 AM CDT | Mesoscale Discussion | SPC | Boone, Carroll, Cook, DeKalb, DuPage, Grundy and 12 more | 93 min |
| Jul 4, 7:25 AM CDT | Mesoscale Discussion | SPC | Cook, Lake, McHenry | 95 min |
| Jul 4, 12:48 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 26 more | 117 min |
| Jul 4, 2:20 PM CDT | Severe Thunderstorm Watch | SPC | Bureau, Champaign, DeWitt, Ford, Fulton, Grundy and 21 more | 6 hr |
| Jul 4, 3:29 PM CDT | Mesoscale Discussion | SPC | Champaign, DeWitt, Douglas, Ford, Iroquois, Kankakee and 4 more | 2 hr |
| Jul 4, 5:07 PM CDT | Mesoscale Discussion | SPC | Bond, Clark, Clay, Clinton, Coles, Crawford and 27 more | 53 min |
| Jul 4, 6:29 PM CDT | Mesoscale Discussion | SPC | Bureau, Champaign, Clark, Coles, DeWitt, Douglas and 29 more | 61 min |
| Jul 3, 11:23 PM CDT | Mesoscale Discussion | SPC | Adams, Barron, Buffalo, Chippewa, Clark, Crawford and 17 more | 97 min |
| Jul 4, 12:42 AM CDT | Mesoscale Discussion | SPC | Barron, Buffalo, Chippewa, Crawford, Dunn, Eau Claire and 9 more | 63 min |
| Jul 4, 7:50 AM CDT | Severe Thunderstorm Watch | SPC | Manitowoc | 3 hr |
Nearby
Severe Thunderstorm Watches in Wisconsin, 2003Severe Thunderstorm Watches in Illinois, 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.