Alert archive / Michigan / Tornado Watches in 2009
Tornado Watch 351
The Storm Prediction Center issued this tornado watch at Jun 8, 2009, 4:02 PM EDT for 33 counties in Michigan. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 8, 2009, 4:02 PM EDT (20:02 UTC)
- Expired
- Jun 8, 2009, 10:00 PM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 33 counties
Allegan County, MI, Barry County, MI, Bay County, MI, Calhoun County, MI, Clinton County, MI, Eaton County, MI, Genesee County, MI, Gratiot County, MI, Huron County, MI, Ingham County, MI, Ionia County, MI, Isabella County, MI, Jackson County, MI, Kalamazoo County, MI, Kent County, MI, Lapeer County, MI, Livingston County, MI, Macomb County, MI, Mecosta County, MI, Midland County, MI, Montcalm County, MI, Muskegon County, MI, Newaygo County, MI, Oakland County, MI, Ottawa County, MI, Saginaw County, MI, Saint Clair County, MI, Sanilac County, MI, Shiawassee County, MI, Tuscola County, MI, Van Buren County, MI, Washtenaw County, MI, Wayne County, MI
The radar
The Grand Rapids radar (KGRR), 70 km from the middle of the area, began a volume at 20:02 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
- 20%
- 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
12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 8, 4:06 PM EDT | Severe Thunderstorm Warning | DTX | Livingston | 71 min |
| Jun 8, 5:06 PM EDT | Severe Thunderstorm Warning | GRR | Barry | 54 min |
| Jun 8, 5:59 PM EDT | Severe Thunderstorm Warning | GRR | Gratiot, Montcalm | 61 min |
| Jun 8, 6:10 PM EDT | Tornado Warning | GRR | Gratiot | 35 min |
| Jun 8, 6:37 PM EDT | Severe Thunderstorm Warning | DTX | Saginaw | 28 min |
| Jun 8, 6:42 PM EDT | Severe Thunderstorm Warning | GRR | Allegan, Ottawa, Van Buren | 63 min |
| Jun 8, 7:23 PM EDT | Severe Thunderstorm Warning | GRR | Allegan, Barry | 52 min |
| Jun 8, 7:25 PM EDT | Severe Thunderstorm Warning | DTX | Shiawassee | 40 min |
| Jun 8, 8:13 PM EDT | Severe Thunderstorm Warning | DTX | Livingston | 47 min |
| Jun 8, 8:16 PM EDT | Severe Thunderstorm Warning | DTX | Genesee | 44 min |
| Jun 8, 8:40 PM EDT | Severe Thunderstorm Warning | DTX | Oakland | 52 min |
| Jun 8, 8:42 PM EDT | Severe Thunderstorm Warning | DTX | Lapeer | 49 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, 8.0 hours before the alert went out and 111 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 767 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 136 m²/s²
- 0-3 km storm-relative helicity
- 206 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 8, 3:34 PM EDT | Mesoscale Discussion | SPC | Barry, Branch, Calhoun, Cass, Clinton, Eaton and 15 more | 56 min |
| Jun 8, 4:53 PM EDT | Mesoscale Discussion | SPC | Berrien | 67 min |
| Jun 8, 6:46 PM EDT | Mesoscale Discussion | SPC | Allegan, Barry, Branch, Calhoun, Cass, Clinton and 20 more | 59 min |
Nearby
Tornado Watches in Michigan, 2009Every tornado watch in 2009
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.