Alert archive / Minnesota / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 662
The Storm Prediction Center issued this severe thunderstorm watch at Jul 19, 2011, 9:07 AM CDT for 20 counties in Minnesota; 20 counties in Wisconsin. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 19, 2011, 9:07 AM CDT (14:07 UTC)
- Expired
- Jul 19, 2011, 3:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 40 counties
Anoka County, MN, Benton County, MN, Chisago County, MN, Dakota County, MN, Dodge County, MN, Fillmore County, MN, Goodhue County, MN, Hennepin County, MN, Houston County, MN, Isanti County, MN, Kanabec County, MN, Mille Lacs County, MN, Mower County, MN, Olmsted County, MN, Pine County, MN, Ramsey County, MN, Sherburne County, MN, Wabasha County, MN, Washington County, MN, Winona County, MN, Barron County, WI, Buffalo County, WI, Burnett County, WI, Chippewa County, WI, Clark County, WI, Dunn County, WI, Eau Claire County, WI, Jackson County, WI, La Crosse County, WI, Monroe County, WI, Pepin County, WI, Pierce County, WI, Polk County, WI, Price County, WI, Rusk County, WI, Saint Croix County, WI, Sawyer County, WI, Taylor County, WI, Trempealeau County, WI, Washburn County, WI
The radar
The Minneapolis radar (KMPX), 114 km from the middle of the area, began a volume at 14:09 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
- 40%
- One or more gusts of 65 knots or more
- 40%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 9:30 AM CDT | Severe Thunderstorm Warning | MPX | Kanabec, Mille Lacs, Morrison | 42 min |
| Jul 19, 9:45 AM CDT | Severe Thunderstorm Warning | MPX | Benton, Isanti, Kanabec, Mille Lacs, Sherburne | 60 min |
| Jul 19, 10:09 AM CDT | Severe Thunderstorm Warning | MPX | Anoka, Sherburne | 36 min |
| Jul 19, 10:40 AM CDT | Severe Thunderstorm Warning | MPX | Anoka, Hennepin, Ramsey | 80 min |
| Jul 19, 11:25 AM CDT | Severe Thunderstorm Warning | MPX | Dakota, Hennepin, Ramsey, Washington | 65 min |
| Jul 19, 2:14 PM CDT | Severe Thunderstorm Warning | DLH | Carlton, Pine, Saint Louis | 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
Minneapolis, MN (KMPX), launched 12:00Z, 2.1 hours before the alert went out and 116 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
- 5144 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 830 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 53 m²/s²
- 0-3 km storm-relative helicity
- 109 m²/s²
- Significant tornado parameter
- 0.9
- Supercell composite
- 5.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 2:08 AM CDT | Mesoscale Discussion | SPC | Becker, Clay, Hubbard, Mahnomen, Norman, Otter Tail and 2 more | 2 hr |
| Jul 19, 11:57 AM CDT | Mesoscale Discussion | SPC | Fillmore, Goodhue, Houston, Olmsted, Wabasha, Winona | 93 min |
| Jul 19, 1:04 PM CDT | Mesoscale Discussion | SPC | Fillmore, Houston, Mower, Olmsted, Winona | 86 min |
| Jul 18, 9:06 PM CDT | Mesoscale Discussion | SPC | Columbia, Dane, Dodge, Fond du Lac, Green, Green Lake and 14 more | 54 min |
| Jul 19, 5:28 PM CDT | Mesoscale Discussion | SPC | Barron, Chippewa, Clark, Langlade, Lincoln, Marathon and 14 more | 62 min |
| Jul 19, 5:43 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Barron, Brown, Calumet, Chippewa, Clark and 32 more | 7 hr |
Nearby
Severe Thunderstorm Watches in Minnesota, 2011Severe Thunderstorm Watches in Wisconsin, 2011Every severe thunderstorm watch in 2011
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.