Alert archive / Minnesota / Tornado Watches in 2009
Tornado Watch 467
The Storm Prediction Center issued this tornado watch at Jun 18, 2009, 3:12 PM CDT for 42 counties in Minnesota. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 18, 2009, 3:12 PM CDT (20:12 UTC)
- Expired
- Jun 18, 2009, 11:00 PM CDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 3 in
- Strongest gust expected
- 70 kt
All 42 counties
Anoka County, MN, Benton County, MN, Blue Earth County, MN, Brown County, MN, Carver County, MN, Chippewa County, MN, Chisago County, MN, Cottonwood County, MN, Dakota County, MN, Douglas County, MN, Faribault County, MN, Freeborn County, MN, Goodhue County, MN, Hennepin County, MN, Isanti County, MN, Jackson County, MN, Kanabec County, MN, Kandiyohi County, MN, Le Sueur County, MN, Martin County, MN, McLeod County, MN, Meeker County, MN, Mille Lacs County, MN, Morrison County, MN, Nicollet County, MN, Pope County, MN, Ramsey County, MN, Redwood County, MN, Renville County, MN, Rice County, MN, Scott County, MN, Sherburne County, MN, Sibley County, MN, Stearns County, MN, Steele County, MN, Stevens County, MN, Swift County, MN, Todd County, MN, Waseca County, MN, Washington County, MN, Watonwan County, MN, Wright County, MN
The radar
The Minneapolis radar (KMPX), 82 km from the middle of the area, began a volume at 20:13 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
- 70%
- One or more EF2 to EF5 tornadoes
- 30%
- Ten or more severe wind reports
- 60%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 90%
- One or more hailstones of 2 inches or more
- 70%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 3:41 PM CDT | Severe Thunderstorm Warning | MPX | Stearns | 64 min |
| Jun 18, 4:47 PM CDT | Severe Thunderstorm Warning | MPX | Morrison, Stearns | 43 min |
| Jun 18, 5:13 PM CDT | Severe Thunderstorm Warning | MPX | Benton, Morrison, Stearns | 62 min |
| Jun 18, 6:04 PM CDT | Severe Thunderstorm Warning | MPX | Benton, Mille Lacs, Morrison | 56 min |
| Jun 18, 6:32 PM CDT | Severe Thunderstorm Warning | MPX | Kanabec | 58 min |
| Jun 18, 6:44 PM CDT | Severe Thunderstorm Warning | MPX | Stevens | 61 min |
| Jun 18, 7:03 PM CDT | Severe Thunderstorm Warning | MPX | Douglas | 57 min |
| Jun 18, 8:51 PM CDT | Severe Thunderstorm Warning | MPX | Stearns | 54 min |
| Jun 18, 9:43 PM CDT | Severe Thunderstorm Warning | MPX | Sherburne, Stearns, Wright | 47 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
Minneapolis, MN (KMPX), launched 12:00Z, 8.2 hours before the alert went out and 79 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
- 1400 J/kg
- Mixed-layer CIN
- -119 J/kg
- Mixed-layer LCL
- 669 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 165 m²/s²
- 0-3 km storm-relative helicity
- 165 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.4
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 17, 7:01 PM CDT | Tornado Watch | SPC | Blue Earth, Brown, Dodge, Faribault, Fillmore, Freeborn and 13 more | 5 hr |
| Jun 17, 11:07 PM CDT | Mesoscale Discussion | SPC | Dakota, Dodge, Fillmore, Goodhue, Houston, Mower and 3 more | 53 min |
| Jun 17, 11:53 PM CDT | Severe Thunderstorm Watch | SPC | Dakota, Dodge, Faribault, Fillmore, Freeborn, Goodhue and 9 more | 6 hr |
| Jun 18, 12:52 PM CDT | Mesoscale Discussion | SPC | Becker, Clay, Douglas, Grant, Otter Tail, Pope and 5 more | 83 min |
| Jun 18, 1:50 PM CDT | Severe Thunderstorm Watch | SPC | Becker, Big Stone, Cass, Chippewa, Clay, Crow Wing and 17 more | 7 hr |
| Jun 18, 3:15 PM CDT | Mesoscale Discussion | SPC | Blue Earth, Brown, Cottonwood, Dodge, Faribault, Fillmore and 15 more | 90 min |
| Jun 18, 6:49 PM CDT | Mesoscale Discussion | SPC | Becker, Big Stone, Cass, Crow Wing, Douglas, Grant and 9 more | 86 min |
| Jun 18, 6:52 PM CDT | Mesoscale Discussion | SPC | Lincoln, Lyon, Pipestone, Rock | 113 min |
Nearby
Tornado Watches in Minnesota, 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.