Alert archive / Michigan / Severe Thunderstorm Watches in 2003
Severe Thunderstorm Watch 823
The Storm Prediction Center issued this severe thunderstorm watch at Aug 1, 2003, 9:45 AM EST for 8 counties in Indiana; 21 counties in Michigan; Defiance County, Williams County, Ohio. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 1, 2003, 9:45 AM EST (14:45 UTC)
- Expired
- Aug 1, 2003, 3:00 PM EST
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 31 counties
DeKalb County, IN, Elkhart County, IN, LaGrange County, IN, LaPorte County, IN, Marshall County, IN, Noble County, IN, Saint Joseph County, IN, Steuben County, IN, Barry County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Clinton County, MI, Eaton County, MI, Genesee County, MI, Gratiot County, MI, Hillsdale County, MI, Ingham County, MI, Ionia County, MI, Jackson County, MI, Kalamazoo County, MI, Lapeer County, MI, Lenawee County, MI, Livingston County, MI, Oakland County, MI, Saginaw County, MI, Saint Joseph County, MI, Shiawassee County, MI, Washtenaw County, MI, Defiance County, OH, Williams County, OH
The radar
The Grand Rapids radar (KGRR), 88 km from the middle of the area, began a volume at 14:47 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
24 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 11:17 AM EST | Severe Thunderstorm Warning | GRR | Gratiot, Montcalm | 58 min |
| Aug 1, 11:22 AM EST | Severe Thunderstorm Warning | GRR | Gratiot, Montcalm | 53 min |
| Aug 1, 11:39 AM EST | Severe Thunderstorm Warning | GRR | Kalamazoo | 51 min |
| Aug 1, 11:52 AM EST | Severe Thunderstorm Warning | DTX | Saginaw | 68 min |
| Aug 1, 11:56 AM EST | Severe Thunderstorm Warning | DTX | Shiawassee | 79 min |
| Aug 1, 11:59 AM EST | Severe Thunderstorm Warning | GRR | Clinton | 31 min |
| Aug 1, 12:01 PM EST | Severe Thunderstorm Warning | GRR | Calhoun, Eaton | 59 min |
| Aug 1, 12:20 PM EST | Severe Thunderstorm Warning | GRR | Ingham | 55 min |
| Aug 1, 12:24 PM EST | Severe Thunderstorm Warning | GRR | Clinton | 36 min |
| Aug 1, 12:27 PM EST | Severe Thunderstorm Warning | GRR | Kalamazoo | 33 min |
| Aug 1, 12:45 PM EST | Severe Thunderstorm Warning | GRR | Jackson | 75 min |
| Aug 1, 12:57 PM EST | Severe Thunderstorm Warning | GRR | Calhoun | 33 min |
| Aug 1, 1:13 PM EST | Severe Thunderstorm Warning | GRR | Ingham | 47 min |
| Aug 1, 1:25 PM EST | Tornado Warning | GRR | Jackson | 50 min |
| Aug 1, 1:41 PM EST | Severe Thunderstorm Warning | DTX | Livingston | 79 min |
| Aug 1, 1:54 PM EST | Severe Thunderstorm Warning | DTX | Washtenaw | 81 min |
| Aug 1, 2:14 PM EST | Severe Thunderstorm Warning | IWX | Branch | 61 min |
| Aug 1, 2:22 PM EST | Severe Thunderstorm Warning | DTX | Oakland | 68 min |
| Aug 1, 2:27 PM EST | Severe Thunderstorm Warning | IWX | Allen, DeKalb | 63 min |
| Aug 1, 2:36 PM EST | Severe Thunderstorm Warning | IWX | Saint Joseph | 54 min |
| Aug 1, 2:44 PM EST | Tornado Warning | IWX | Branch | 46 min |
| Aug 1, 2:49 PM EST | Severe Thunderstorm Warning | IWX | LaGrange, Steuben | 41 min |
| Aug 1, 2:51 PM EST | Severe Thunderstorm Warning | DTX | Lapeer, Saint Clair | 69 min |
| Aug 1, 2:58 PM EST | Severe Thunderstorm Warning | IWX | Hillsdale | 62 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, 2.8 hours before the alert went out and 160 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
- 212 J/kg
- Mixed-layer CIN
- -115 J/kg
- Mixed-layer LCL
- 1092 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 25 m²/s²
- 0-3 km storm-relative helicity
- 24 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 1:45 PM EST | Mesoscale Discussion | SPC | LaGrange, Steuben | 60 min |
| Aug 1, 2:45 PM EST | Severe Thunderstorm Watch | SPC | Adams, Allen, Carroll, Cass, DeKalb, Elkhart and 18 more | 6 hr |
| Aug 1, 6:34 PM EST | Mesoscale Discussion | SPC | Adams, Allen, Carroll, Cass, DeKalb, Elkhart and 18 more | 86 min |
| Aug 1, 11:22 AM EST | Mesoscale Discussion | SPC | Bay, Calhoun, Genesee, Hillsdale, Ingham, Jackson and 7 more | 113 min |
Nearby
Severe Thunderstorm Watches in Michigan, 2003Severe Thunderstorm Watches in Indiana, 2003Severe Thunderstorm Watches in Ohio, 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.