Alert archive / Minnesota / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 549
The Storm Prediction Center issued this severe thunderstorm watch at Aug 1, 2012, 5:12 PM CDT for 34 counties in Minnesota; Brookings County, Lake County, Moody County, South Dakota. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 1, 2012, 5:12 PM CDT (22:12 UTC)
- Expired
- Aug 1, 2012, 10:25 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 37 counties
Anoka County, MN, Blue Earth County, MN, Brown County, MN, Carver County, MN, Chippewa County, MN, Cottonwood County, MN, Dakota County, MN, Faribault County, MN, Freeborn County, MN, Goodhue County, MN, Hennepin County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Le Sueur County, MN, Lincoln County, MN, Lyon County, MN, Martin County, MN, McLeod County, MN, Meeker County, MN, Murray County, MN, Nicollet County, MN, Pipestone County, MN, Ramsey County, MN, Redwood County, MN, Renville County, MN, Rice County, MN, Scott County, MN, Sibley County, MN, Steele County, MN, Waseca County, MN, Washington County, MN, Watonwan County, MN, Wright County, MN, Yellow Medicine County, MN, Brookings County, SD, Lake County, SD, Moody County, SD
The radar
The Sioux Falls radar (KFSD), 145 km from the middle of the area, began a volume at 22:15 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
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 50%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 90%
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 |
|---|---|---|---|---|
| Aug 1, 5:13 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln | 47 min |
| Aug 1, 5:40 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Lyon | 50 min |
| Aug 1, 6:02 PM CDT | Severe Thunderstorm Warning | MPX | Redwood, Renville, Yellow Medicine | 58 min |
| Aug 1, 6:23 PM CDT | Severe Thunderstorm Warning | FSD | Lyon | 26 min |
| Aug 1, 6:47 PM CDT | Severe Thunderstorm Warning | MPX | Brown, Nicollet, Redwood, Renville, Sibley | 58 min |
| Aug 1, 7:08 PM CDT | Severe Thunderstorm Warning | MPX | McLeod, Renville, Sibley | 37 min |
| Aug 1, 8:48 PM CDT | Severe Thunderstorm Warning | MPX | Carver, Hennepin, Scott | 20 min |
| Aug 1, 9:19 PM CDT | Severe Thunderstorm Warning | MPX | Dakota, Goodhue, Rice | 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
Minneapolis, MN (KMPX), launched 12:00Z, 10.2 hours before the alert went out and 169 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
- 670 J/kg
- Mixed-layer CIN
- -340 J/kg
- Mixed-layer LCL
- 1367 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 246 m²/s²
- 0-3 km storm-relative helicity
- 292 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 1:07 PM CDT | Mesoscale Discussion | SPC | Anoka, Carver, Chisago, Dakota, Goodhue, Hennepin and 6 more | 23 min |
| Aug 1, 4:14 PM CDT | Mesoscale Discussion | SPC | Anoka, Benton, Brown, Carver, Chippewa, Chisago and 24 more | 91 min |
| Aug 1, 2:53 PM CDT | Mesoscale Discussion | SPC | Aurora, Beadle, Bennett, Brule, Buffalo, Charles Mix and 20 more | 67 min |
| Aug 1, 3:19 PM CDT | Severe Thunderstorm Watch | SPC | Aurora, Beadle, Bennett, Brule, Buffalo, Charles Mix and 28 more | 6 hr |
Nearby
Severe Thunderstorm Watches in Minnesota, 2012Severe Thunderstorm Watches in South Dakota, 2012Every severe thunderstorm watch in 2012
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.