Alert archive / Minnesota / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 124, NWS Twin Cities, MN

July 9, 20174 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 9, 2017, 9:11 PM CDT for 4 counties in Minnesota. It was in force for 49 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
Jul 9, 2017, 9:11 PM CDT (02:11 UTC)
Expired
Jul 9, 2017, 10:00 PM CDT
In force
49 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Blue Earth County, MN, Le Sueur County, MN, Nicollet County, MN, Waseca County, MN

The radar

The Minneapolis radar (KMPX), 71 km from the middle of the area, began a volume at 02:13 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 9, 9:53 PM CDTTSTM WND DMGWaterville, MNDAMAGE TO ROOF OF A HOME. PHOTO FROM SOCIAL MEDIA.

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 9, 7:05 PM CDTTornado WatchSPC7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 2.2 hours before the alert went out and 71 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 00:00Z on 2017-07-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 627 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 00:00Z on 2017-07-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 222 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
627 J/kg
Mixed-layer CIN
-187 J/kg
Mixed-layer LCL
1764 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
222 m²/s²
0-3 km storm-relative helicity
278 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.6

Open this sounding in Storm Lab

The text

As transmitted.

602 
WUUS53 KMPX 100211
SVRMPX
MNC013-079-103-161-100300-
/O.NEW.KMPX.SV.W.0124.170710T0211Z-170710T0300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
911 PM CDT SUN JUL 9 2017

The National Weather Service in The Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Le Sueur County in south central Minnesota...
  Northeastern Blue Earth County in south central Minnesota...
  Northwestern Waseca County in south central Minnesota...
  Eastern Nicollet County in south central Minnesota...

* Until 1000 PM CDT

* At 910 PM CDT, severe thunderstorms were located along a line
  extending from Montgomery to near Cleveland to near Norseland,
  moving south at 30 mph.

  HAZARD...60 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees. 

* Severe thunderstorms will be near,
  St. Peter and Cleveland around 915 PM CDT. 
  Kasota around 925 PM CDT. 
  Eagle Lake and Madison Lake around 935 PM CDT. 
  North Mankato, Waterville and Elysian around 940 PM CDT. 
  Janesville around 945 PM CDT. 
  St. Clair around 950 PM CDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

A tornado watch remains in effect until 100 AM CDT for south central
Minnesota.

LAT...LON 4406 9410 4443 9412 4442 9388 4451 9353
      4428 9353 4411 9350 4401 9381
TIME...MOT...LOC 0210Z 351DEG 26KT 4443 9358 4435 9389 4438 9409 

HAIL...1.00IN
WIND...60MPH
 
$$
1 follow-up statement
267 
WWUS53 KMPX 100245
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
945 PM CDT SUN JUL 9 2017

MNC013-079-103-161-100300-
/O.CON.KMPX.SV.W.0124.000000T0000Z-170710T0300Z/
Le Sueur MN-Blue Earth MN-Waseca MN-Nicollet MN-
945 PM CDT SUN JUL 9 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM CDT
FOR SOUTHERN LE SUEUR...NORTHEASTERN BLUE EARTH...NORTHWESTERN WASECA
AND EASTERN NICOLLET COUNTIES...

At 945 PM CDT, severe thunderstorms were located along a line
extending from near Waterville to near St. Clair to Skyline, moving
south at 30 mph.

HAZARD...70 mph wind gusts and ping pong ball size hail. 

SOURCE...Public. 

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect 
         considerable tree damage. Wind damage is also likely to 
         mobile homes, roofs, and outbuildings. 

These severe storms will be near...
  Janesville and St. Clair around 950 PM CDT. 

Other locations impacted by these severe thunderstorms include
Skyline, Oshawa, Mankato Airport, Kilkenny, Lake Jefferson, Smiths
Mill and Greenland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

A tornado watch remains in effect until 100 AM CDT for south central
Minnesota.

LAT...LON 4441 9412 4431 9385 4446 9353 4428 9353
      4411 9350 4401 9381 4406 9410
TIME...MOT...LOC 0245Z 351DEG 26KT 4420 9353 4412 9384 4415 9404 

HAIL...1.50IN
WIND...70MPH
 
$$

jrb

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 9, 7:35 PM CDTSevere Thunderstorm WarningMPXStevens, Swift40 min
Jul 9, 7:50 PM CDTSevere Thunderstorm WarningMPXMille Lacs, Morrison40 min
Jul 9, 7:51 PM CDTSevere Thunderstorm WarningMPXMcLeod, Meeker, Renville39 min
Jul 9, 7:57 PM CDTTornado WarningMPXStevens, Swift33 min
Jul 9, 8:09 PM CDTTornado WarningMPXSwift28 min
Jul 9, 8:21 PM CDTTornado WarningMPXChippewa, Lac qui Parle39 min
Jul 9, 8:22 PM CDTSevere Thunderstorm WarningMPXBenton, Morrison38 min
Jul 9, 8:25 PM CDTSevere Thunderstorm WarningMPXKanabec, Mille Lacs40 min
Jul 9, 8:28 PM CDTSpecial Weather StatementMPXMcLeod, Scott47 min
Jul 9, 8:33 PM CDTSevere Thunderstorm WarningMPXMcLeod, Renville, Sibley42 min
Jul 9, 8:54 PM CDTSevere Thunderstorm WarningMPXChippewa, Lac qui Parle, Yellow Medicine66 min
Jul 9, 8:55 PM CDTSevere Thunderstorm WarningMPXBenton, Sherburne25 min
Jul 9, 8:56 PM CDTSevere Thunderstorm WarningMPXDakota, Le Sueur, Rice, Scott34 min
Jul 9, 8:58 PM CDTSevere Thunderstorm WarningMPXChippewa, Swift47 min
Jul 9, 9:03 PM CDTSevere Thunderstorm WarningMPXNicollet, Sibley42 min
Jul 9, 9:06 PM CDTSevere Thunderstorm WarningMPXKandiyohi, Pope, Stearns27 min
Jul 9, 9:09 PM CDTSevere Thunderstorm WarningMPXChippewa, Lac qui Parle, Swift20 min
Jul 9, 9:16 PM CDTSevere Thunderstorm WarningMPXDakota, Hennepin, Ramsey, Washington44 min
Jul 9, 9:23 PM CDTSevere Thunderstorm WarningMPXDakota, Rice, Scott53 min
Jul 9, 9:26 PM CDTSevere Thunderstorm WarningMPXBlue Earth, Brown, Nicollet49 min
Jul 9, 9:30 PM CDTTornado WarningMPXNicollet30 min
Jul 9, 9:51 PM CDTSevere Thunderstorm WarningMPXBlue Earth, Steele, Waseca54 min
Jul 9, 10:10 PM CDTSevere Thunderstorm WarningMPXBlue Earth, Nicollet35 min
Jul 9, 10:19 PM CDTTornado WarningMPXBlue Earth41 min
Jul 9, 10:34 PM CDTSevere Thunderstorm WarningMPXNicollet, Sibley41 min
Jul 9, 10:41 PM CDTSevere Thunderstorm WarningMPXFaribault, Freeborn, Steele, Waseca64 min
Jul 9, 10:51 PM CDTSevere Thunderstorm WarningMPXMcLeod, Renville, Sibley39 min
Jul 9, 10:55 PM CDTSevere Thunderstorm WarningMPXBrown, Redwood, Renville35 min
Jul 9, 11:05 PM CDTSevere Thunderstorm WarningMPXBlue Earth40 min
Jul 9, 11:17 PM CDTSevere Thunderstorm WarningMPXFaribault, Freeborn43 min
Jul 9, 11:39 PM CDTSevere Thunderstorm WarningMPXBlue Earth, Brown, Nicollet, Watonwan37 min
Jul 9, 11:55 PM CDTSevere Thunderstorm WarningMPXRedwood18 min
Jul 10, 12:05 AM CDTSevere Thunderstorm WarningMPXBlue Earth, Faribault, Martin40 min
Jul 10, 12:45 AM CDTSevere Thunderstorm WarningMPXFaribault, Freeborn30 min
Jul 10, 12:47 AM CDTSevere Thunderstorm WarningMPXNicollet26 min
Jul 10, 1:30 AM CDTSevere Thunderstorm WarningMPXBlue Earth, Brown, Watonwan35 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2017Every severe thunderstorm warning in 2017

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.