Alert archive / Minnesota / Tornado Warnings in 2010

Tornado Warning 90, NWS Twin Cities, MN

August 12, 2010Chippewa County, Lac qui Parle County, Swift County, Minnesota

NWS Twin Cities, MN issued this tornado warning at Aug 12, 2010, 6:18 PM CDT for Chippewa County, Lac qui Parle County, Swift County, Minnesota. It was in force for 42 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Aug 12, 2010, 6:18 PM CDT (23:18 UTC)
Expired
Aug 12, 2010, 7:00 PM CDT
In force
42 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon

Counties Chippewa County, MN, Lac qui Parle County, MN, Swift County, MN

The radar

The Minneapolis radar (KMPX), 181 km from the middle of the area, began a volume at 23:19 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 was reported inside it

TimeReportWhereRemark
Aug 12, 6:24 PM CDTTORNADO3 W Dawson, MN

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 12, 3:22 PM CDTTornado WatchSPC7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.3 hours before the alert went out and 178 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.

Skew-T log-pSkew-T log-p diagram, Minneapolis, MN at 12:00Z on 2010-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1077 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2010-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1077 J/kg
Mixed-layer CIN
-230 J/kg
Mixed-layer LCL
1195 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
26 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

010 
WFUS53 KMPX 122318
TORMPX
MNC023-073-151-130000-
/O.NEW.KMPX.TO.W.0090.100812T2318Z-100813T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
618 PM CDT THU AUG 12 2010

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL SWIFT COUNTY IN WEST CENTRAL MINNESOTA...
  EASTERN LAC QUI PARLE COUNTY IN WEST CENTRAL MINNESOTA...
  NORTHWESTERN CHIPPEWA COUNTY IN WEST CENTRAL MINNESOTA...

* UNTIL 700 PM CDT

* AT 614 PM CDT...RADAR INDICATED A STORM CAPABLE OF PRODUCING A
  TORNADO. THE MOST DANGEROUS PART OF THE STORM WAS 4 MILES NORTHWEST
  OF DAWSON...OR ABOUT 11 MILES NORTH OF PROVIDENCE...AND MOVING
  NORTHEAST AT 35 MPH.

* LOCATIONS IN THE WARNING INCLUDE...
  WATSON...
  MILAN...
  BIG BEND CITY...
  DANVERS...
  CERRO GORDO...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WHEN A TORNADO WARNING IS ISSUED BASED ON RADAR...IT MEANS THAT
STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY ALREADY
BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT THURSDAY EVENING
FOR SOUTHWESTERN MINNESOTA.

&&

LAT...LON 4536 9571 4508 9541 4486 9609 4500 9625
TIME...MOT...LOC 2318Z 229DEG 29KT 4499 9607

$$
1 follow-up statement
202 
WWUS53 KMPX 122326
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
626 PM CDT THU AUG 12 2010

MNC023-073-151-130000-
/O.CON.KMPX.TO.W.0090.000000T0000Z-100813T0000Z/
SWIFT MN-LAC QUI PARLE MN-CHIPPEWA MN-
626 PM CDT THU AUG 12 2010

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN CHIPPEWA...
EASTERN LAC QUI PARLE AND CENTRAL SWIFT COUNTIES IN WEST CENTRAL
MINNESOTA UNTIL 700 PM CDT...

AT 623 PM CDT...LOCAL LAW ENFORCEMENT REPORTED A TORNADO WEST OF DAWSON.  
THI TORNADO WAS LOCATED 8 MILES EAST OF MADISON...MOVING NORTHEAST AT 35
MPH.

LOCATIONS IMPACTED INCLUDE...
  WATSON...MILAN...BIG BEND CITY AND DANVERS.

LAT...LON 4536 9571 4508 9541 4486 9609 4500 9625
TIME...MOT...LOC 2326Z 229DEG 29KT 4503 9600

$$

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 12, 6:34 AM CDTSpecial Weather StatementMPXTodd41 min
Aug 12, 6:40 AM CDTSevere Thunderstorm WarningMPXDouglas, Todd26 min
Aug 12, 10:03 AM CDTHeat AdvisoryMPXAnoka, Blue Earth, Brown, Carver, Dakota, Faribault and 16 more9 hr
Aug 12, 4:37 PM CDTFlash Flood WatchMPXAnoka, Carver, Chisago, Dakota, Freeborn, Goodhue and 9 more29 hr
Aug 12, 5:28 PM CDTTornado WarningMPXLac qui Parle, Swift62 min
Aug 12, 5:34 PM CDTSpecial Weather StatementMPXRedwood56 min
Aug 12, 5:40 PM CDTSevere Thunderstorm WarningMPXBrown, Redwood, Renville, Yellow Medicine65 min
Aug 12, 6:19 PM CDTSevere Thunderstorm WarningMPXDouglas56 min
Aug 12, 6:21 PM CDTTornado WarningMPXStevens24 min
Aug 12, 6:28 PM CDTTornado WarningMPXChippewa, Lac qui Parle, Swift47 min
Aug 12, 6:35 PM CDTSevere Thunderstorm WarningMPXBrown, Chippewa, Kandiyohi, McLeod, Meeker, Redwood and 4 more55 min
Aug 12, 6:40 PM CDTAreal Flood AdvisoryMPXLac qui Parle, Swift6 hr
Aug 12, 6:47 PM CDTTornado WarningMPXStevens28 min
Aug 12, 6:52 PM CDTSevere Thunderstorm WarningMPXBlue Earth, Brown, McLeod, Nicollet, Sibley53 min
Aug 12, 6:58 PM CDTTornado WarningMPXDouglas, Pope47 min

Nearby

Tornado Warnings in Minnesota, 2010Every tornado warning in 2010Tornadoes 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.