Alert archive / Minnesota / Tornado Warnings in 2010

Tornado Warning 66, NWS Twin Cities, MN

July 17, 20104 counties in Minnesota

NWS Twin Cities, MN issued this tornado warning at Jul 17, 2010, 4:19 PM CDT for 4 counties in Minnesota. It was in force for 26 min. 5 reports 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
Jul 17, 2010, 4:19 PM CDT (21:19 UTC)
Expired
Jul 17, 2010, 4:45 PM CDT
In force
26 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon

Counties Carver County, MN, Hennepin County, MN, Meeker County, MN, Wright County, MN

The radar

The Minneapolis radar (KMPX), 40 km from the middle of the area, began a volume at 21:20 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
Jul 17, 4:26 PM CDTFUNNEL CLOUDCokato, MNTIME ESTIMATED
Jul 17, 4:28 PM CDTHAIL 0.54 Ne Dassel, MN
Jul 17, 4:30 PM CDTHAIL 25 Sw Annandale, MN
Jul 17, 4:33 PM CDTHAIL 1Howard Lake, MN
Jul 17, 4:33 PM CDTHAIL 1.757 Wsw Buffalo, 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
Jul 17, 12:28 PM CDTTornado WatchSPC11 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 9.3 hours before the alert went out and 38 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 2010-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 368 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2010-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 119 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
368 J/kg
Mixed-layer CIN
-101 J/kg
Mixed-layer LCL
1285 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
119 m²/s²
0-3 km storm-relative helicity
226 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

Open this sounding in Storm Lab

The text

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

495 
WFUS53 KMPX 172119
TORMPX
MNC019-053-093-171-172145-
/O.NEW.KMPX.TO.W.0066.100717T2119Z-100717T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
419 PM CDT SAT JUL 17 2010

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  WESTERN WRIGHT COUNTY IN CENTRAL MINNESOTA...
  EAST CENTRAL MEEKER COUNTY IN CENTRAL MINNESOTA...
  EXTREME WEST CENTRAL HENNEPIN COUNTY IN EAST CENTRAL MINNESOTA...
  NORTHWESTERN CARVER COUNTY IN EAST CENTRAL MINNESOTA...

* UNTIL 445 PM CDT

* AT 416 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A TORNADO 2 
  MILES SOUTHEAST OF KINGSTON. RADAR SHOWED THE TORNADIC STORM 
  MOVING SOUTHEAST AT 35 MPH.

* LOCATIONS IN THE WARNING INCLUDE...
  COKATO...
  HOWARD LAKE...
  WAVERLY...
  MONTROSE...
  WATERTOWN...
  MAYER...
  SMITH LAKE...
  RASSAT...

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 800 PM CDT SATURDAY EVENING
FOR SOUTHERN MINNESOTA AND NORTHWESTERN WISCONSIN.

&&

LAT...LON 4502 9377 4485 9392 4492 9402 4498 9402
      4498 9410 4517 9435 4529 9413
TIME...MOT...LOC 2118Z 313DEG 29KT 4517 9417

$$

JLT
1 follow-up statement
491 
WWUS53 KMPX 172127
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
427 PM CDT SAT JUL 17 2010

MNC053-172137-
/O.CAN.KMPX.TO.W.0066.000000T0000Z-100717T2145Z/
HENNEPIN MN-
427 PM CDT SAT JUL 17 2010

...THE TORNADO WARNING FOR EXTREME WEST CENTRAL HENNEPIN COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

LAT...LON 4513 9391 4510 9386 4503 9378 4500 9378
      4485 9392 4492 9402 4498 9402 4498 9410
      4516 9433 4517 9434 4529 9413
TIME...MOT...LOC 2127Z 313DEG 29KT 4512 9410

$$

MNC019-093-171-172145-
/O.CON.KMPX.TO.W.0066.000000T0000Z-100717T2145Z/
WRIGHT MN-MEEKER MN-CARVER MN-
427 PM CDT SAT JUL 17 2010

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN CARVER...EAST
CENTRAL MEEKER AND WESTERN WRIGHT COUNTIES UNTIL 445 PM CDT...

AT 425 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A TORNADO.  THIS
TORNADO WAS LOCATED 5 MILES NORTHEAST OF COKATO...OR 20 MILES EAST OF
LITCHFIELD...MOVING SOUTHEAST AT 35 MPH.

LOCATIONS IMPACTED INCLUDE...
  HOWARD LAKE...WAVERLY...MONTROSE...WATERTOWN...MAYER...SMITH LAKE
  AND RASSAT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINFALL MAY HIDE THIS TORNADO. DO NOT WAIT TO SEE OR HEAR THE
TORNADO. TAKE COVER NOW.

&&

LAT...LON 4513 9391 4510 9386 4503 9378 4500 9378
      4485 9392 4492 9402 4498 9402 4498 9410
      4516 9433 4517 9434 4529 9413
TIME...MOT...LOC 2127Z 313DEG 29KT 4512 9410

$$

JLT

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 17, 12:15 PM CDTSpecial Weather StatementMPXKandiyohi, Swift60 min
Jul 17, 1:08 PM CDTSpecial Weather StatementMPXSwift52 min
Jul 17, 1:16 PM CDTSpecial Weather StatementMPXTodd44 min
Jul 17, 1:39 PM CDTTornado WarningMPXStearns, Todd51 min
Jul 17, 1:49 PM CDTSevere Thunderstorm WarningMPXDouglas, Todd56 min
Jul 17, 1:58 PM CDTTornado WarningMPXDouglas, Todd47 min
Jul 17, 2:20 PM CDTSevere Thunderstorm WarningMPXStearns, Todd40 min
Jul 17, 2:48 PM CDTSpecial Weather StatementMPXBenton42 min
Jul 17, 2:56 PM CDTTornado WarningMPXStearns34 min
Jul 17, 3:28 PM CDTSevere Thunderstorm WarningMPXMeeker, Stearns, Wright62 min
Jul 17, 3:58 PM CDTSevere Thunderstorm WarningMPXMeeker, Stearns, Wright62 min
Jul 17, 4:45 PM CDTSevere Thunderstorm WarningMPXCarver, Hennepin, McLeod, Wright60 min
Jul 17, 4:58 PM CDTTornado WarningMPXCarver, Hennepin, Wright47 min
Jul 17, 5:10 PM CDTTornado WarningMPXMorrison, Todd65 min
Jul 17, 5:44 PM CDTSpecial Weather StatementMPXHennepin46 min
Jul 17, 5:49 PM CDTTornado WarningMPXMorrison41 min
Jul 17, 6:12 PM CDTSevere Thunderstorm WarningMPXChippewa, Lac qui Parle, Swift, Yellow Medicine63 min
Jul 17, 6:25 PM CDTTornado WarningMPXMille Lacs, Morrison50 min
Jul 17, 6:28 PM CDTSevere Thunderstorm WarningMPXChippewa, Kandiyohi, Renville, Swift, Yellow Medicine62 min
Jul 17, 6:54 PM CDTTornado WarningMPXBenton, Mille Lacs, Morrison51 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.