Alert archive / Michigan / Severe Thunderstorm Watches in 2003
Severe Thunderstorm Watch 771
The Storm Prediction Center issued this severe thunderstorm watch at Jul 20, 2003, 1:20 PM EST for DeKalb County, Steuben County, Indiana; 34 counties in Michigan; 8 counties in Ohio. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 20, 2003, 1:20 PM EST (18:20 UTC)
- Expired
- Jul 20, 2003, 7:00 PM EST
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 44 counties
DeKalb County, IN, Steuben County, IN, Alcona County, MI, Alpena County, MI, Arenac County, MI, Bay County, MI, Clare County, MI, Clinton County, MI, Crawford County, MI, Eaton County, MI, Genesee County, MI, Gladwin County, MI, Gratiot County, MI, Hillsdale County, MI, Huron County, MI, Ingham County, MI, Iosco County, MI, Isabella County, MI, Jackson County, MI, Lapeer County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Midland County, MI, Monroe County, MI, Montmorency County, MI, Oakland County, MI, Ogemaw County, MI, Oscoda County, MI, Otsego County, MI, Roscommon County, MI, Saginaw County, MI, Shiawassee County, MI, Tuscola County, MI, Washtenaw County, MI, Wayne County, MI, Defiance County, OH, Fulton County, OH, Henry County, OH, Lucas County, OH, Ottawa County, OH, Sandusky County, OH, Williams County, OH, Wood County, OH
The radar
The Detroit radar (KDTX), 51 km from the middle of the area, began a volume at 18:19 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
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 1:28 PM EST | Severe Thunderstorm Warning | APX | Oscoda | 47 min |
| Jul 20, 1:41 PM EST | Tornado Warning | IWX | Branch, Hillsdale | 64 min |
| Jul 20, 2:45 PM EST | Tornado Warning | IWX | Hillsdale | 60 min |
| Jul 20, 3:06 PM EST | Severe Thunderstorm Warning | APX | Iosco | 39 min |
| Jul 20, 3:12 PM EST | Severe Thunderstorm Warning | IWX | Fulton | 63 min |
| Jul 20, 4:39 PM EST | Severe Thunderstorm Warning | CLE | Wood | 66 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
Detroit, MI (KDTX), launched 12:00Z, 6.3 hours before the alert went out and 53 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1593 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 92 m²/s²
- 0-3 km storm-relative helicity
- 118 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 20, 12:41 PM EST | Mesoscale Discussion | SPC | Steuben | 64 min |
| Jul 20, 3:37 PM EST | Mesoscale Discussion | SPC | Steuben | 113 min |
| Jul 20, 4:25 PM EST | Severe Thunderstorm Watch | SPC | Jasper, Lake, Newton, Porter | 5 hr |
| Jul 20, 6:23 PM EST | Mesoscale Discussion | SPC | Elkhart, Fulton, Jasper, Kosciusko, LaGrange, Lake and 10 more | 97 min |
| Jul 20, 6:45 PM EST | Severe Thunderstorm Watch | SPC | DeKalb, Elkhart, Kosciusko, LaGrange, LaPorte, Marshall and 5 more | 5 hr |
| Jul 20, 1:16 PM EST | Mesoscale Discussion | SPC | Alger, Baraga, Dickinson, Gogebic, Houghton, Iron and 3 more | 119 min |
| Jul 20, 1:55 PM EST | Severe Thunderstorm Watch | SPC | Alger, Baraga, Delta, Dickinson, Gogebic, Houghton and 4 more | 7 hr |
| Jul 20, 3:27 PM EST | Mesoscale Discussion | SPC | Alger, Baraga, Delta, Dickinson, Gogebic, Houghton and 4 more | 63 min |
| Jul 20, 6:47 PM EST | Mesoscale Discussion | SPC | Baraga, Delta, Dickinson, Gogebic, Houghton, Iron and 3 more | 88 min |
Nearby
Severe Thunderstorm Watches in Michigan, 2003Severe Thunderstorm Watches in Ohio, 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.