Alert archive / Michigan / Tornado Watches in 2023
Tornado Watch 478
The Storm Prediction Center issued this tornado watch at Jul 12, 2023, 8:55 PM EDT for 10 counties in Indiana; 20 counties in Michigan; Fulton County, Williams County, Ohio. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 12, 2023, 8:55 PM EDT (00:55 UTC)
- Expired
- Jul 13, 2023, 3:00 AM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 55 kt
All 32 counties
DeKalb County, IN, Elkhart County, IN, Kosciusko County, IN, LaGrange County, IN, LaPorte County, IN, Marshall County, IN, Noble County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, Allegan County, MI, Barry County, MI, Berrien County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Eaton County, MI, Hillsdale County, MI, Ingham County, MI, Jackson County, MI, Kalamazoo County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Monroe County, MI, Oakland County, MI, Saint Joseph County, MI, Van Buren County, MI, Washtenaw County, MI, Wayne County, MI, Fulton County, OH, Williams County, OH
The radar
The Grand Rapids radar (KGRR), 72 km from the middle of the area, began a volume at 00:55 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
- 30%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 10%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 12, 9:28 PM EDT | Tornado Warning | GRR | Van Buren | 47 min |
| Jul 12, 9:43 PM EDT | Severe Thunderstorm Warning | IWX | Cass, Saint Joseph | 47 min |
| Jul 12, 9:59 PM EDT | Severe Thunderstorm Warning | GRR | Kalamazoo | 69 min |
| Jul 12, 10:52 PM EDT | Severe Thunderstorm Warning | GRR | Barry, Eaton | 53 min |
| Jul 12, 11:04 PM EDT | Tornado Warning | IWX | Branch, Saint Joseph | 41 min |
| Jul 12, 11:29 PM EDT | Tornado Warning | DTX | Livingston | 14 min |
| Jul 12, 11:40 PM EDT | Tornado Warning | IWX | Branch, Hillsdale | 35 min |
| Jul 13, 12:04 AM EDT | Severe Thunderstorm Warning | GRR | Clinton, Ingham | 41 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, 0.9 hours before the alert went out and 163 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
- 26 J/kg
- Mixed-layer CIN
- -68 J/kg
- Mixed-layer LCL
- 578 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 153 m²/s²
- 0-3 km storm-relative helicity
- 257 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 12, 8:02 PM EDT | Mesoscale Discussion | SPC | Elkhart, Lake, LaPorte, Marshall, Porter, Saint Joseph and 1 more | 58 min |
| Jul 12, 10:46 PM EDT | Mesoscale Discussion | SPC | Elkhart, LaGrange, Steuben | 59 min |
| Jul 13, 1:26 PM EDT | Mesoscale Discussion | SPC | Ohio, Switzerland | 64 min |
| Jul 13, 1:56 PM EDT | Severe Thunderstorm Watch | SPC | Dearborn, Ohio, Ripley, Switzerland | 7 hr |
| Jul 13, 12:59 AM EDT | Mesoscale Discussion | SPC | Lenawee, Macomb, Monroe, Oakland, Washtenaw, Wayne | 91 min |
| Jul 13, 4:42 PM EDT | Mesoscale Discussion | SPC | Adams, Athens, Brown, Clermont, Gallia, Hamilton and 11 more | 93 min |
Nearby
Tornado Watches in Michigan, 2023Tornado Watches in Indiana, 2023Tornado Watches in Ohio, 2023Every tornado watch in 2023
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.