Alert archive / Minnesota / Severe Thunderstorm Watches in 2007
Severe Thunderstorm Watch 656
The Storm Prediction Center issued this severe thunderstorm watch at Aug 27, 2007, 6:19 PM CDT for 5 counties in Minnesota; 4 counties in Wisconsin. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 27, 2007, 6:19 PM CDT (23:19 UTC)
- Expired
- Aug 28, 2007, 1:00 AM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Carlton County, MN, Cook County, MN, Lake County, MN, Pine County, MN, Saint Louis County, MN, Ashland County, WI, Bayfield County, WI, Douglas County, WI, Iron County, WI
The radar
The Duluth radar (KDLH), 53 km from the middle of the area, began a volume at 23:23 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
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 10%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 9:10 PM CDT | Severe Thunderstorm Warning | DLH | Carlton, Pine | 35 min |
| Aug 27, 11:33 PM CDT | Severe Thunderstorm Warning | DLH | Ashland, Bayfield | 42 min |
| Aug 28, 12:11 AM CDT | Severe Thunderstorm Warning | DLH | Ashland, Iron | 46 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
International Fa, MN (KINL), launched 12:00Z, 11.3 hours before the alert went out and 175 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
- 44 J/kg
- Mixed-layer CIN
- -331 J/kg
- Mixed-layer LCL
- 780 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 157 m²/s²
- 0-3 km storm-relative helicity
- 178 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 26, 8:04 PM CDT | Mesoscale Discussion | SPC | Kittson, Marshall, Pennington, Polk, Red Lake, Roseau | 116 min |
| Aug 26, 10:25 PM CDT | Mesoscale Discussion | SPC | Becker, Beltrami, Clay, Clearwater, Koochiching, Mahnomen and 4 more | 65 min |
| Aug 27, 1:43 AM CDT | Mesoscale Discussion | SPC | Anoka, Chisago, Dakota, Dodge, Fillmore, Goodhue and 12 more | 92 min |
| Aug 27, 7:10 AM CDT | Mesoscale Discussion | SPC | Wilkin | 95 min |
| Aug 27, 10:14 AM CDT | Mesoscale Discussion | SPC | Becker, Beltrami, Clay, Clearwater, Hubbard, Itasca and 8 more | 91 min |
| Aug 27, 12:55 PM CDT | Mesoscale Discussion | SPC | Becker, Clay, Mahnomen, Norman, Otter Tail, Wilkin | 65 min |
| Aug 27, 2:29 PM CDT | Severe Thunderstorm Watch | SPC | Aitkin, Becker, Beltrami, Cass, Clay, Clearwater and 15 more | 8 hr |
| Aug 27, 5:34 PM CDT | Mesoscale Discussion | SPC | Aitkin, Becker, Carlton, Cass, Clay, Clearwater and 8 more | 116 min |
Nearby
Severe Thunderstorm Watches in Minnesota, 2007Severe Thunderstorm Watches in Wisconsin, 2007Every severe thunderstorm watch in 2007
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.