Alert archive / Michigan / Severe Thunderstorm Watches in 2003
Severe Thunderstorm Watch 633
The Storm Prediction Center issued this severe thunderstorm watch at Jul 4, 2003, 7:50 AM EST for 4 states. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 4, 2003, 7:50 AM EST (12:50 UTC)
- Expired
- Jul 4, 2003, 11:00 AM EST
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
All 31 counties
Elkhart County, IN, LaGrange County, IN, LaPorte County, IN, Saint Joseph County, IN, Steuben County, IN, Allegan County, MI, Barry County, MI, Berrien County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Clare County, MI, Eaton County, MI, Hillsdale County, MI, Ionia County, MI, Isabella County, MI, Kalamazoo County, MI, Kent County, MI, Lake County, MI, Mason County, MI, Mecosta County, MI, Montcalm County, MI, Muskegon County, MI, Newaygo County, MI, Oceana County, MI, Osceola County, MI, Ottawa County, MI, Saint Joseph County, MI, Van Buren County, MI, Williams County, OH, Manitowoc County, WI
The radar
The Grand Rapids radar (KGRR), 31 km from the middle of the area, began a volume at 12:49 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
7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 8:30 AM EST | Severe Thunderstorm Warning | GRR | Allegan, Muskegon, Ottawa, Van Buren | 45 min |
| Jul 4, 9:14 AM EST | Severe Thunderstorm Warning | GRR | Allegan, Barry, Kalamazoo | 46 min |
| Jul 4, 9:16 AM EST | Severe Thunderstorm Warning | GRR | Newaygo | 44 min |
| Jul 4, 9:56 AM EST | Severe Thunderstorm Warning | IWX | LaGrange | 49 min |
| Jul 4, 9:59 AM EST | Severe Thunderstorm Warning | GRR | Calhoun, Eaton | 46 min |
| Jul 4, 10:18 AM EST | Severe Thunderstorm Warning | GRR | Clinton, Ionia | 42 min |
| Jul 4, 10:30 AM EST | Severe Thunderstorm Warning | IWX | Steuben | 60 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, 0.8 hours before the alert went out and 195 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
- 849 J/kg
- Mixed-layer CIN
- -66 J/kg
- Mixed-layer LCL
- 1097 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 64 m²/s²
- 0-3 km storm-relative helicity
- 78 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 4, 9:28 AM EST | Mesoscale Discussion | SPC | DeKalb, Elkhart, Kosciusko, LaGrange, Noble, Steuben | 2 hr |
| Jul 4, 12:04 PM EST | Mesoscale Discussion | SPC | Allen, DeKalb, Elkhart, Kosciusko, LaGrange, LaPorte and 7 more | 116 min |
| Jul 4, 12:48 PM EST | Mesoscale Discussion | SPC | Carroll, Cass, Elkhart, Fulton, Grant, Jasper and 15 more | 117 min |
| Jul 4, 1:45 PM EST | Mesoscale Discussion | SPC | Adams, Allen, DeKalb, Whitley | 60 min |
| Jul 4, 2:20 PM EST | Severe Thunderstorm Watch | SPC | Adams, Allen, Benton, Blackford, Boone, Carroll and 36 more | 6 hr |
| Jul 4, 3:29 PM EST | Mesoscale Discussion | SPC | Adams, Allen, Benton, Blackford, Boone, Carroll and 28 more | 2 hr |
| Jul 4, 5:07 PM EST | Mesoscale Discussion | SPC | Bartholomew, Brown, Clark, Clay, Crawford, Daviess and 37 more | 53 min |
| Jul 4, 5:50 PM EST | Severe Thunderstorm Watch | SPC | Bartholomew, Brown, Clay, Daviess, Dearborn, Decatur and 29 more | 5 hr |
| Jul 4, 6:29 PM EST | Mesoscale Discussion | SPC | Adams, Allen, Benton, Blackford, Boone, Carroll and 45 more | 61 min |
| Jul 4, 7:25 AM EST | Mesoscale Discussion | SPC | Allegan, Barry, Benzie, Cass, Kalamazoo, Kent and 12 more | 95 min |
| Jul 4, 9:45 AM EST | Severe Thunderstorm Watch | SPC | Clinton, Genesee, Gratiot, Hillsdale, Ingham, Jackson and 11 more | 5 hr |
| Jul 4, 2:05 PM EST | Severe Thunderstorm Watch | SPC | Allen, Ashland, Auglaize, Carroll, Champaign, Clark and 47 more | 6 hr |
| Jul 3, 11:23 PM EST | Mesoscale Discussion | SPC | Adams, Barron, Buffalo, Chippewa, Clark, Crawford and 17 more | 97 min |
| Jul 4, 12:42 AM EST | Mesoscale Discussion | SPC | Barron, Buffalo, Chippewa, Crawford, Dunn, Eau Claire and 9 more | 63 min |
| Jul 4, 1:15 AM EST | Severe Thunderstorm Watch | SPC | Adams, Barron, Buffalo, Chippewa, Clark, Columbia and 28 more | 6 hr |
| Jul 4, 3:27 AM EST | Mesoscale Discussion | SPC | Adams, Buffalo, Calumet, Clark, Columbia, Crawford and 37 more | 93 min |
| Jul 4, 5:20 AM EST | Severe Thunderstorm Watch | SPC | Brown, Calumet, Dodge, Fond du Lac, Green Lake, Jefferson and 14 more | 4 hr |
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.