Alert archive / Minnesota / Tornado Watches in 2010
Tornado Watch 613
The Storm Prediction Center issued this tornado watch at Aug 13, 2010, 4:24 PM CDT for 7 counties in Minnesota; Buffalo County, Trempealeau County, Wisconsin. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 13, 2010, 4:24 PM CDT (21:24 UTC)
- Expired
- Aug 13, 2010, 10:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Dodge County, MN, Fillmore County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Wabasha County, MN, Winona County, MN, Buffalo County, WI, Trempealeau County, WI
The radar
The La Crosse radar (KARX), 73 km from the middle of the area, began a volume at 21:28 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
- 30%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 10%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 10%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 40%
Warnings issued inside it
7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 4:44 PM CDT | Flash Flood Warning | ARX | Dodge, Mower, Olmsted | 4 hr |
| Aug 13, 4:45 PM CDT | Tornado Warning | ARX | Dodge, Olmsted | 30 min |
| Aug 13, 5:43 PM CDT | Tornado Warning | ARX | Olmsted | 32 min |
| Aug 13, 5:50 PM CDT | Flash Flood Warning | ARX | Olmsted, Wabasha, Winona | 6 hr |
| Aug 13, 6:16 PM CDT | Severe Thunderstorm Warning | ARX | Olmsted | 44 min |
| Aug 13, 6:53 PM CDT | Severe Thunderstorm Warning | ARX | Fillmore, Houston, Winona | 16 min |
| Aug 13, 7:05 PM CDT | Flash Flood Warning | ARX | Fillmore, Houston, Olmsted, Winona | 6 hr |
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, 9.4 hours before the alert went out and 154 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
- 112 J/kg
- Mixed-layer CIN
- -488 J/kg
- Mixed-layer LCL
- 959 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 177 m²/s²
- 0-3 km storm-relative helicity
- 206 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
The text
As transmitted, in the capitals the NWS used until 2016.
972
WWUS20 KWNS 132124
SEL3
SPC WW 132124
MNZ000-WIZ000-140300-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 613
NWS STORM PREDICTION CENTER NORMAN OK
425 PM CDT FRI AUG 13 2010
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
SOUTHEAST MINNESOTA
A SMALL PART OF SOUTHWEST WISCONSIN
EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 425 PM UNTIL
1000 PM CDT.
TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 35 STATUTE
MILES EAST AND WEST OF A LINE FROM 40 MILES NORTHEAST OF
ROCHESTER MINNESOTA TO 40 MILES SOUTHEAST OF ROCHESTER MINNESOTA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU3).
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.
OTHER WATCH INFORMATION...CONTINUE...WW 609...WW 610...WW
611...WW 612...
DISCUSSION...A 2-3 HOUR WINDOW OF OPPORTUNITY EXISTS FOR SUPERCELLS
WITH A RISK OF TORNADOES ACROSS SE MN...IN THE NARROW ZONE OF
ENHANCED LOW-LEVEL SHEAR AND MODERATE SURFACE-BASED INSTABILITY NW
OF THE LARGER COLD POOL ACROSS ERN IA/NW IL/SRN WI.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 24020.
...THOMPSONSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 8:29 PM CDT | Mesoscale Discussion | SPC | Anoka, Benton, Carver, Chisago, Dakota, Hennepin and 12 more | 61 min |
| Aug 12, 10:53 PM CDT | Mesoscale Discussion | SPC | Benton, Big Stone, Chippewa, Douglas, Grant, Kandiyohi and 18 more | 67 min |
| Aug 13, 12:48 AM CDT | Mesoscale Discussion | SPC | Blue Earth, Carver, Dakota, Dodge, Faribault, Fillmore and 17 more | 57 min |
| Aug 13, 1:19 AM CDT | Severe Thunderstorm Watch | SPC | Anoka, Blue Earth, Carver, Chisago, Dakota, Dodge and 27 more | 4 hr |
| Aug 13, 2:58 AM CDT | Mesoscale Discussion | SPC | Lac qui Parle, Lincoln, Lyon, Murray, Nobles, Pipestone and 2 more | 62 min |
| Aug 13, 4:20 AM CDT | Mesoscale Discussion | SPC | Houston | 115 min |
| Aug 13, 5:27 AM CDT | Severe Thunderstorm Watch | SPC | Anoka, Benton, Blue Earth, Brown, Carver, Chisago and 31 more | 8 hr |
| Aug 13, 9:16 AM CDT | Mesoscale Discussion | SPC | Blue Earth, Brown, Carver, Cottonwood, Dakota, Dodge and 25 more | 119 min |
| Aug 13, 10:36 AM CDT | Mesoscale Discussion | SPC | Blue Earth, Brown, Carver, Cottonwood, Dakota, Dodge and 23 more | 84 min |
| Aug 13, 12:04 PM CDT | Mesoscale Discussion | SPC | Blue Earth, Brown, Carver, Cottonwood, Dakota, Dodge and 30 more | 56 min |
| Aug 13, 2:39 PM CDT | Severe Thunderstorm Watch | SPC | Aitkin, Anoka, Benton, Blue Earth, Brown, Carlton and 38 more | 7 hr |
| Aug 13, 1:54 PM CDT | Mesoscale Discussion | SPC | Green, Rock, Walworth | 66 min |
| Aug 13, 2:28 PM CDT | Tornado Watch | SPC | Dane, Green, Iowa, Jefferson, Kenosha, Lafayette and 5 more | 5 hr |
| Aug 13, 5:27 PM CDT | Mesoscale Discussion | SPC | Green, Rock, Walworth | 63 min |
Nearby
Tornado Watches in Minnesota, 2010Tornado Watches in Wisconsin, 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.