Alert archive / Minnesota / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 135, NWS Twin Cities, MN

July 9, 2017Blue Earth County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 9, 2017, 11:05 PM CDT for Blue Earth County, Minnesota. It was in force for 40 min. 2 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 9, 2017, 11:05 PM CDT (04:05 UTC)
Expired
Jul 9, 2017, 11:45 PM CDT
In force
40 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Tornado
Possible
Hail
1.0 in
Wind
60.0 mph

County Blue Earth County, MN

The radar

The Minneapolis radar (KMPX), 103 km from the middle of the area, began a volume at 04:09 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 was reported inside it

TimeReportWhereRemark
Jul 9, 11:10 PM CDTTSTM WND DMG1 Ne Good Thunder, MNLAW ENFORCEMENT REPORTS TREES & POWER LINES DOWN.
Jul 9, 11:32 PM CDTTSTM WND GST 734 N Minnesota Lake, MNMEASURED BY A MOBILE MESONET.

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, 4.1 hours before the alert went out and 102 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.

630 
WUUS53 KMPX 100405
SVRMPX
MNC013-100445-
/O.NEW.KMPX.SV.W.0135.170710T0405Z-170710T0445Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
1105 PM CDT SUN JUL 9 2017

The National Weather Service in The Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Southeastern Blue Earth County in south central Minnesota...

* Until 1145 PM CDT

* At 1105 PM CDT, a severe thunderstorm was located near Good
  Thunder, or 10 miles south of Mankato, moving southeast at 25 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. 

* This severe thunderstorm will be near,
  Mapleton around 1120 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 4402 9417 4412 9397 4396 9377 4385 9377
      4385 9403
TIME...MOT...LOC 0405Z 322DEG 20KT 4401 9401 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$
3 follow-up statements
430 
WWUS53 KMPX 100422
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1122 PM CDT SUN JUL 9 2017

MNC013-100445-
/O.CON.KMPX.SV.W.0135.000000T0000Z-170710T0445Z/
Blue Earth MN-
1122 PM CDT SUN JUL 9 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 PM CDT
FOR SOUTHEASTERN BLUE EARTH COUNTY...

At 1122 PM CDT, a severe thunderstorm was located over Mapleton, or
16 miles south of Mankato, moving southeast at 25 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. 

this severe thunderstorm will remain over mainly rural areas of
southeastern Blue Earth County.

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 4388 9405 4401 9400 4407 9390 4396 9377
      4385 9377 4385 9403
TIME...MOT...LOC 0422Z 322DEG 20KT 4394 9393 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$

jrb
168 
WWUS53 KMPX 100428
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1128 PM CDT SUN JUL 9 2017

MNC013-100445-
/O.CON.KMPX.SV.W.0135.000000T0000Z-170710T0445Z/
Blue Earth MN-
1128 PM CDT SUN JUL 9 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 PM CDT
FOR SOUTHEASTERN BLUE EARTH COUNTY...

At 1127 PM CDT, a severe thunderstorm was located over Mapleton, or
17 miles south of Mankato, moving southeast at 25 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. 

This severe thunderstorm will remain over mainly rural areas of
southeastern Blue Earth County.

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 4395 9392 4402 9385 4396 9377 4385 9377
      4385 9396
TIME...MOT...LOC 0427Z 322DEG 20KT 4391 9390 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$

jrb
608 
WWUS53 KMPX 100438
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1138 PM CDT SUN JUL 9 2017

MNC013-100447-
/O.EXP.KMPX.SV.W.0135.000000T0000Z-170710T0445Z/
Blue Earth MN-
1138 PM CDT SUN JUL 9 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BLUE EARTH COUNTY
WILL EXPIRE AT 1145 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore the warning will be allowed to expire.  However heavy rain 
is still possible with this thunderstorm and additional 
thunderstorms that are north of Mankato and heading back to this 
area.

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

LAT...LON 4395 9392 4402 9385 4396 9377 4385 9377
      4385 9396
TIME...MOT...LOC 0437Z 322DEG 20KT 4387 9385 

$$

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, 9:11 PM CDTSevere Thunderstorm WarningMPXBlue Earth, Le Sueur, Nicollet, Waseca49 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, 11:17 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.