Alert archive / Michigan / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 663
The Storm Prediction Center issued this severe thunderstorm watch at Jul 21, 2004, 2:35 PM CDT for 4 states. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 21, 2004, 2:35 PM CDT (19:35 UTC)
- Expired
- Jul 21, 2004, 9:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 82 counties
Boone County, IL, Bureau County, IL, Cook County, IL, DeKalb County, IL, DeWitt County, IL, DuPage County, IL, Ford County, IL, Grundy County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Logan County, IL, Marshall County, IL, McHenry County, IL, McLean County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Tazewell County, IL, Will County, IL, Woodford County, IL, Elkhart County, IN, Jasper County, IN, Kosciusko County, IN, LaGrange County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Newton County, IN, Noble County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, Allegan County, MI, Arenac County, MI, Barry County, MI, Bay County, MI, Berrien County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Clinton County, MI, Eaton County, MI, Genesee County, MI, Gladwin County, MI, Gratiot County, MI, Hillsdale County, MI, Huron County, MI, Ingham County, MI, Ionia County, MI, Iosco County, MI, Isabella County, MI, Jackson County, MI, Kalamazoo County, MI, Kent County, MI, Lapeer County, MI, Livingston County, MI, Macomb County, MI, Mecosta County, MI, Midland County, MI, Montcalm County, MI, Newaygo County, MI, Oakland County, MI, Ottawa County, MI, Saginaw County, MI, Saint Clair County, MI, Saint Joseph County, MI, Sanilac County, MI, Shiawassee County, MI, Tuscola County, MI, Van Buren County, MI, Washtenaw County, MI, Wayne County, MI, Kenosha County, WI, Racine County, WI
The radar
The Chicago radar (KLOT), 126 km from the middle of the area, began a volume at 19:38 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
33 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 3:42 PM CDT | Severe Thunderstorm Warning | LOT | Kane, Kendall | 63 min |
| Jul 21, 3:43 PM CDT | Severe Thunderstorm Warning | GRR | Muskegon, Ottawa | 47 min |
| Jul 21, 3:57 PM CDT | Severe Thunderstorm Warning | GRR | Allegan | 63 min |
| Jul 21, 4:03 PM CDT | Severe Thunderstorm Warning | GRR | Kent | 57 min |
| Jul 21, 4:07 PM CDT | Severe Thunderstorm Warning | LOT | DuPage, Will | 38 min |
| Jul 21, 4:34 PM CDT | Severe Thunderstorm Warning | GRR | Montcalm | 56 min |
| Jul 21, 4:36 PM CDT | Severe Thunderstorm Warning | LOT | Cook | 39 min |
| Jul 21, 4:42 PM CDT | Severe Thunderstorm Warning | GRR | Montcalm | 48 min |
| Jul 21, 4:43 PM CDT | Severe Thunderstorm Warning | GRR | Barry | 47 min |
| Jul 21, 4:47 PM CDT | Severe Thunderstorm Warning | GRR | Ionia | 43 min |
| Jul 21, 5:03 PM CDT | Severe Thunderstorm Warning | LOT | Lake | 42 min |
| Jul 21, 5:28 PM CDT | Severe Thunderstorm Warning | LOT | Porter | 47 min |
| Jul 21, 5:37 PM CDT | Severe Thunderstorm Warning | IWX | LaPorte | 53 min |
| Jul 21, 5:45 PM CDT | Severe Thunderstorm Warning | LOT | Lake | 45 min |
| Jul 21, 5:46 PM CDT | Severe Thunderstorm Warning | IWX | Berrien | 59 min |
| Jul 21, 5:52 PM CDT | Severe Thunderstorm Warning | LOT | Newton | 38 min |
| Jul 21, 6:01 PM CDT | Severe Thunderstorm Warning | IWX | Saint Joseph | 59 min |
| Jul 21, 6:08 PM CDT | Severe Thunderstorm Warning | LOT | Jasper | 37 min |
| Jul 21, 6:17 PM CDT | Severe Thunderstorm Warning | IWX | Cass | 58 min |
| Jul 21, 6:21 PM CDT | Tornado Warning | LOT | Jasper, Newton | 24 min |
| Jul 21, 6:28 PM CDT | Tornado Warning | IWX | Cass | 62 min |
| Jul 21, 6:33 PM CDT | Severe Thunderstorm Warning | IWX | Elkhart | 57 min |
| Jul 21, 6:36 PM CDT | Severe Thunderstorm Warning | LOT | Porter | 39 min |
| Jul 21, 6:42 PM CDT | Severe Thunderstorm Warning | IWX | Pulaski, Starke | 63 min |
| Jul 21, 6:47 PM CDT | Tornado Warning | LOT | Jasper | 13 min |
| Jul 21, 6:48 PM CDT | Severe Thunderstorm Warning | IWX | Marshall | 57 min |
| Jul 21, 6:56 PM CDT | Severe Thunderstorm Warning | LOT | Will | 49 min |
| Jul 21, 6:56 PM CDT | Severe Thunderstorm Warning | IWX | Saint Joseph | 64 min |
| Jul 21, 6:58 PM CDT | Severe Thunderstorm Warning | IWX | Kosciusko | 62 min |
| Jul 21, 7:00 PM CDT | Severe Thunderstorm Warning | IWX | LaGrange | 60 min |
| Jul 21, 7:08 PM CDT | Severe Thunderstorm Warning | IWX | Noble | 67 min |
| Jul 21, 7:18 PM CDT | Severe Thunderstorm Warning | IWX | Steuben | 57 min |
| Jul 21, 7:54 PM CDT | Severe Thunderstorm Warning | IWX | Hillsdale | 51 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, 7.6 hours before the alert went out and 269 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
- 1316 J/kg
- Mixed-layer CIN
- -41 J/kg
- Mixed-layer LCL
- 687 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 39 m²/s²
- 0-3 km storm-relative helicity
- 104 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 7:53 AM CDT | Mesoscale Discussion | SPC | Boone, DuPage, Kane, Lake, McHenry, Stephenson and 1 more | 2 hr |
| Jul 21, 9:03 AM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Champaign, Cook, DeKalb and 37 more | 117 min |
| Jul 21, 9:35 AM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 26 more | 5 hr |
| Jul 21, 10:18 AM CDT | Mesoscale Discussion | SPC | Bureau, Cook, DeKalb, DuPage, Ford, Grundy and 14 more | 87 min |
| Jul 21, 1:01 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 25 more | 89 min |
| Jul 21, 5:09 PM CDT | Mesoscale Discussion | SPC | Bureau, DeWitt, Ford, Grundy, Iroquois, Kankakee and 13 more | 36 min |
| Jul 21, 6:20 PM CDT | Mesoscale Discussion | SPC | Clark, Coles, Edgar, Vermilion | 25 min |
| Jul 21, 6:35 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Allen, Benton, Blackford, Boone, Carroll and 30 more | 5 hr |
| Jul 21, 11:10 AM CDT | Mesoscale Discussion | SPC | Alpena, Antrim, Arenac, Bay, Benzie, Cheboygan and 24 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Michigan, 2004Severe Thunderstorm Watches in Illinois, 2004Severe Thunderstorm Watches in Indiana, 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.