Alert archive / Michigan / Tornado Watches in 2010
Tornado Watch 724
The Storm Prediction Center issued this tornado watch at Oct 26, 2010, 11:04 AM EDT for 54 counties in Michigan. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Oct 26, 2010, 11:04 AM EDT (15:04 UTC)
- Expired
- Oct 26, 2010, 3:24 PM EDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 0.5 in
- Strongest gust expected
- 60 kt
All 54 counties
Alcona County, MI, Allegan County, MI, Arenac County, MI, Barry County, MI, Bay County, MI, Benzie County, MI, Calhoun County, MI, Clare County, MI, Clinton County, MI, Crawford County, MI, Eaton County, MI, Genesee County, MI, Gladwin County, MI, Grand Traverse County, MI, Gratiot County, MI, Huron County, MI, Ingham County, MI, Ionia County, MI, Iosco County, MI, Isabella County, MI, Jackson County, MI, Kalamazoo County, MI, Kalkaska County, MI, Kent County, MI, Lake County, MI, Lapeer County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Manistee County, MI, Mason County, MI, Mecosta County, MI, Midland County, MI, Missaukee County, MI, Monroe County, MI, Montcalm County, MI, Muskegon County, MI, Newaygo County, MI, Oakland County, MI, Oceana County, MI, Ogemaw County, MI, Osceola County, MI, Oscoda County, MI, Ottawa County, MI, Roscommon 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, Wexford County, MI
The radar
The Grand Rapids radar (KGRR), 50 km from the middle of the area, began a volume at 15:08 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
- 50%
- One or more gusts of 65 knots or more
- 40%
- Ten or more severe hail reports
- 5%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 70%
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 |
|---|---|---|---|---|
| Oct 26, 11:09 AM EDT | Tornado Warning | GRR | Calhoun | 41 min |
| Oct 26, 11:34 AM EDT | Tornado Warning | GRR | Barry, Ionia, Kent | 28 min |
| Oct 26, 11:39 AM EDT | Tornado Warning | GRR | Eaton | 19 min |
| Oct 26, 11:49 AM EDT | Tornado Warning | DTX | Lenawee | 43 min |
| Oct 26, 11:55 AM EDT | Tornado Warning | GRR | Jackson | 50 min |
| Oct 26, 12:11 PM EDT | Severe Thunderstorm Warning | GRR | Gratiot, Isabella, Montcalm | 38 min |
| Oct 26, 12:14 PM EDT | Tornado Warning | DTX | Monroe | 49 min |
| Oct 26, 12:24 PM EDT | Tornado Warning | DTX | Livingston, Shiawassee | 49 min |
| Oct 26, 12:24 PM EDT | Tornado Warning | GRR | Ingham, Jackson | 20 min |
| Oct 26, 12:29 PM EDT | Severe Thunderstorm Warning | DTX | Midland | 35 min |
| Oct 26, 12:33 PM EDT | Severe Thunderstorm Warning | APX | Gladwin | 42 min |
| Oct 26, 12:34 PM EDT | Severe Thunderstorm Warning | GRR | Clare, Isabella | 20 min |
| Oct 26, 1:07 PM EDT | Severe Thunderstorm Warning | APX | Arenac, Gladwin, Iosco, Ogemaw | 38 min |
| Oct 26, 1:28 PM EDT | Tornado Warning | APX | Iosco, Ogemaw | 27 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, 3.1 hours before the alert went out and 133 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
- 110 J/kg
- Mixed-layer CIN
- -73 J/kg
- Mixed-layer LCL
- 537 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 301 m²/s²
- 0-3 km storm-relative helicity
- 348 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 26, 4:28 AM EDT | Tornado Watch | SPC | Allegan, Barry, Berrien, Calhoun, Cass, Clare and 20 more | 8 hr |
| Oct 26, 6:30 AM EDT | Mesoscale Discussion | SPC | Delta, Menominee | 60 min |
| Oct 26, 7:00 AM EDT | Mesoscale Discussion | SPC | Allegan, Barry, Berrien, Branch, Calhoun, Cass and 21 more | 2 hr |
| Oct 26, 8:55 AM EDT | Tornado Watch | SPC | Branch, Hillsdale | 7 hr |
| Oct 26, 10:46 AM EDT | Mesoscale Discussion | SPC | Bay, Calhoun, Clinton, Eaton, Genesee, Gratiot and 15 more | 59 min |
Nearby
Tornado Watches in Michigan, 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.