Alert archive / Michigan / Severe Thunderstorm Watches in 2006
Severe Thunderstorm Watch 660
The Storm Prediction Center issued this severe thunderstorm watch at Jul 30, 2006, 8:27 AM CDT for 5 counties in Illinois; 45 counties in Michigan; 9 counties in Wisconsin. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 30, 2006, 8:27 AM CDT (13:27 UTC)
- Expired
- Jul 30, 2006, 3:19 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 70 kt
All 59 counties
Cook County, IL, DuPage County, IL, Kane County, IL, Lake County, IL, McHenry County, IL, Allegan County, MI, Barry County, MI, Bay County, MI, Berrien County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Clare County, MI, Clinton County, MI, Eaton County, MI, Genesee County, MI, Gratiot County, MI, Hillsdale County, MI, Huron County, MI, Ingham County, MI, Ionia County, MI, Isabella County, MI, Jackson County, MI, Kalamazoo County, MI, Kent County, MI, Lake County, MI, Lapeer County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Mason County, MI, Mecosta County, MI, Midland County, MI, Monroe County, MI, Montcalm County, MI, Muskegon County, MI, Newaygo County, MI, Oakland County, MI, Oceana County, MI, Osceola 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, Dodge County, WI, Jefferson County, WI, Kenosha County, WI, Milwaukee County, WI, Ozaukee County, WI, Racine County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI
The radar
The Grand Rapids radar (KGRR), 48 km from the middle of the area, began a volume at 13:29 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 80%
- One or more gusts of 65 knots or more
- 40%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
14 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 8:32 AM CDT | Severe Thunderstorm Warning | GRR | Mason, Oceana | 88 min |
| Jul 30, 9:34 AM CDT | Severe Thunderstorm Warning | GRR | Muskegon | 56 min |
| Jul 30, 9:35 AM CDT | Severe Thunderstorm Warning | MKX | Kenosha, Racine | 40 min |
| Jul 30, 10:08 AM CDT | Severe Thunderstorm Warning | GRR | Newaygo | 37 min |
| Jul 30, 10:59 AM CDT | Severe Thunderstorm Warning | GRR | Kent | 34 min |
| Jul 30, 11:08 AM CDT | Severe Thunderstorm Warning | GRR | Ionia, Montcalm | 52 min |
| Jul 30, 11:37 AM CDT | Severe Thunderstorm Warning | GRR | Gratiot | 38 min |
| Jul 30, 12:08 PM CDT | Severe Thunderstorm Warning | DTX | Shiawassee | 67 min |
| Jul 30, 12:18 PM CDT | Severe Thunderstorm Warning | DTX | Midland | 35 min |
| Jul 30, 12:59 PM CDT | Severe Thunderstorm Warning | DTX | Genesee | 32 min |
| Jul 30, 1:05 PM CDT | Severe Thunderstorm Warning | DTX | Livingston | 37 min |
| Jul 30, 2:01 PM CDT | Severe Thunderstorm Warning | DTX | Tuscola | 22 min |
| Jul 30, 2:03 PM CDT | Severe Thunderstorm Warning | DTX | Sanilac | 57 min |
| Jul 30, 2:26 PM CDT | Severe Thunderstorm Warning | DTX | Saint Clair | 43 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, 1.5 hours before the alert went out and 141 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
- 866 J/kg
- Mixed-layer CIN
- -66 J/kg
- Mixed-layer LCL
- 1156 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 54 m²/s²
- 0-3 km storm-relative helicity
- 81 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.4
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 2:06 PM CDT | Mesoscale Discussion | SPC | Will | 84 min |
| Jul 30, 2:10 PM CDT | Mesoscale Discussion | SPC | Alexander, Johnson, Massac, Pulaski, Union, Williamson | 3 hr |
| Jul 30, 5:33 PM CDT | Mesoscale Discussion | SPC | Iroquois, Vermilion | 117 min |
| Jul 30, 5:17 AM CDT | Mesoscale Discussion | SPC | Gogebic | 58 min |
| Jul 30, 10:40 AM CDT | Mesoscale Discussion | SPC | Allegan, Barry, Berrien, Branch, Calhoun, Cass and 14 more | 95 min |
| Jul 30, 12:54 AM CDT | Tornado Watch | SPC | Ashland, Barron, Bayfield, Burnett, Douglas, Iron and 7 more | 5 hr |
| Jul 30, 3:17 AM CDT | Mesoscale Discussion | SPC | Ashland, Barron, Bayfield, Burnett, Douglas, Iron and 6 more | 58 min |
| Jul 30, 4:10 AM CDT | Severe Thunderstorm Watch | SPC | Adams, Buffalo, Chippewa, Clark, Columbia, Crawford and 35 more | 5 hr |
| Jul 30, 7:00 AM CDT | Mesoscale Discussion | SPC | Adams, Chippewa, Clark, Columbia, Dane, Dodge and 24 more | 90 min |
Nearby
Severe Thunderstorm Watches in Michigan, 2006Severe Thunderstorm Watches in Wisconsin, 2006Severe Thunderstorm Watches in Illinois, 2006Every severe thunderstorm watch in 2006
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.