Alert archive / Michigan / Tornado Watches in 2010
Tornado Watch 520
The Storm Prediction Center issued this tornado watch at Jul 23, 2010, 12:35 AM EDT for DeKalb County, LaGrange County, Steuben County, Indiana; 21 counties in Michigan; 12 counties in Ohio. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 23, 2010, 12:35 AM EDT (04:35 UTC)
- Expired
- Jul 23, 2010, 3:48 AM EDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 36 counties
DeKalb County, IN, LaGrange County, IN, Steuben County, IN, Allegan County, MI, Barry County, MI, Berrien County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Clinton County, MI, Eaton County, MI, Hillsdale County, MI, Ingham County, MI, Ionia County, MI, Jackson County, MI, Kalamazoo County, MI, Kent County, MI, Lenawee County, MI, Livingston County, MI, Monroe County, MI, Ottawa County, MI, Saint Joseph County, MI, Van Buren County, MI, Washtenaw County, MI, Defiance County, OH, Erie County, OH, Fulton County, OH, Henry County, OH, Huron County, OH, Lorain County, OH, Lucas County, OH, Ottawa County, OH, Sandusky County, OH, Seneca County, OH, Williams County, OH, Wood County, OH
The radar
The Grand Rapids radar (KGRR), 108 km from the middle of the area, began a volume at 04:35 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
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
1 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 12:35 AM EDT | Severe Thunderstorm Warning | GRR | Allegan, Kalamazoo, Van Buren | 40 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 00:00Z, 4.6 hours before the alert went out and 118 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
- 25 J/kg
- Mixed-layer CIN
- -279 J/kg
- Mixed-layer LCL
- 1118 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 419 m²/s²
- 0-3 km storm-relative helicity
- 670 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 12:00 AM EDT | Mesoscale Discussion | SPC | Allen, DeKalb, Elkhart, Fulton, Kosciusko, LaGrange and 9 more | 90 min |
| Jul 23, 3:30 PM EDT | Mesoscale Discussion | SPC | Lake, LaPorte, Porter | 90 min |
| Jul 23, 4:01 PM EDT | Severe Thunderstorm Watch | SPC | Benton, Jasper, Lake, Newton, Porter | 5 hr |
| Jul 23, 5:23 PM EDT | Severe Thunderstorm Watch | SPC | Allen, DeKalb, Elkhart, Fulton, Kosciusko, LaGrange and 8 more | 7 hr |
| Jul 23, 7:47 PM EDT | Mesoscale Discussion | SPC | LaGrange, Saint Joseph, Steuben | 118 min |
| Jul 23, 4:58 PM EDT | Mesoscale Discussion | SPC | Allegan, Barry, Branch, Calhoun, Cass, Eaton and 13 more | 92 min |
| Jul 23, 12:14 PM EDT | Mesoscale Discussion | SPC | Ashtabula, Cuyahoga, Geauga, Lake, Lorain, Mahoning and 4 more | 91 min |
| Jul 23, 12:46 PM EDT | Severe Thunderstorm Watch | SPC | Ashtabula, Geauga, Lake, Mahoning, Portage, Trumbull | 7 hr |
| Jul 23, 7:00 PM EDT | Mesoscale Discussion | SPC | Ashtabula, Columbiana, Cuyahoga, Geauga, Lake, Lorain and 6 more | 60 min |
| Jul 23, 7:19 PM EDT | Severe Thunderstorm Watch | SPC | Ashland, Ashtabula, Columbiana, Crawford, Cuyahoga, Erie and 23 more | 6 hr |
Nearby
Tornado Watches in Michigan, 2010Tornado Watches in Ohio, 2010Tornado Watches in Indiana, 2010Every tornado watch in 2010
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.