Alert archive / Minnesota / Tornado Warnings in 2017

Tornado Warning 24, NWS Twin Cities, MN

July 9, 2017Nicollet County, Minnesota

NWS Twin Cities, MN issued this tornado warning at Jul 9, 2017, 9:30 PM CDT for Nicollet County, Minnesota. It was in force for 30 min. 4 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, 9:30 PM CDT (02:30 UTC)
Expired: Jul 9, 2017, 10:00 PM CDT
In force: 30 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 2.5 in

County Nicollet County, MN

The radar

The Minneapolis radar (KMPX), 87 km from the middle of the area, began a volume at 02:33 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

Time	Report	Where	Remark
Jul 9, 9:30 PM CDT	HAIL 1.75	3 Ne New Ulm, MN
Jul 9, 9:30 PM CDT	HAIL 1.75	5 N Courtland, MN	PICTURE FROM SOCIAL MEDIA.
Jul 9, 9:38 PM CDT	HAIL 1.5	5 N Courtland, MN
Jul 9, 9:42 PM CDT	TSTM WND DMG	3 Nne Courtland, MN	ROOF OF A HOG BARN BLOWN OFF FROM A POSSIBLE TORNADO. TIME ESTIMATED FROM RADAR.

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.

Issued	Product	Office	Lasted
Jul 9, 7:05 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 2.5 hours before the alert went out and 85 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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.

756 
WFUS53 KMPX 100230
TORMPX
MNC103-100300-
/O.NEW.KMPX.TO.W.0024.170710T0230Z-170710T0300Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Twin Cities/Chanhassen MN
930 PM CDT SUN JUL 9 2017

The National Weather Service in The Twin Cities has issued a

* Tornado Warning for...
  Central Nicollet County in south central Minnesota...

* Until 1000 PM CDT
    
* At 929 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Klossner, or near New Ulm, moving south at 20 mph.

  HAZARD...Tornado and tennis ball size hail. 

  SOURCE...Radar indicated rotation. 

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely. 

* This dangerous storm will be near...
  Courtland around 945 PM CDT. 

Other locations impacted by this tornadic thunderstorm include
Klossner.

This includes U.S. Highway 14 between mile markers 104 and 105, and
between mile markers 107 and 115.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4426 9433 4427 9441 4429 9442 4433 9445
      4438 9443 4441 9430 4426 9425
TIME...MOT...LOC 0229Z 348DEG 19KT 4434 9436 

TORNADO...RADAR INDICATED
HAIL...2.50IN

$$

1 follow-up statement

555 
WWUS53 KMPX 100256
SVSMPX

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

MNC103-100306-
/O.EXP.KMPX.TO.W.0024.000000T0000Z-170710T0300Z/
Nicollet MN-
956 PM CDT SUN JUL 9 2017

...THE TORNADO WARNING FOR CENTRAL NICOLLET COUNTY WILL EXPIRE AT
1000 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning will be allowed to expire.

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

Remember, a Severe Thunderstorm Warning still remains in effect.

LAT...LON 4426 9433 4427 9441 4429 9442 4433 9445
      4438 9443 4441 9430 4426 9425
TIME...MOT...LOC 0256Z 339DEG 14KT 4428 9430 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 7:35 PM CDT	Severe Thunderstorm Warning	MPX	Stevens, Swift	40 min
Jul 9, 7:50 PM CDT	Severe Thunderstorm Warning	MPX	Mille Lacs, Morrison	40 min
Jul 9, 7:51 PM CDT	Severe Thunderstorm Warning	MPX	McLeod, Meeker, Renville	39 min
Jul 9, 7:57 PM CDT	Tornado Warning	MPX	Stevens, Swift	33 min
Jul 9, 8:09 PM CDT	Tornado Warning	MPX	Swift	28 min
Jul 9, 8:21 PM CDT	Tornado Warning	MPX	Chippewa, Lac qui Parle	39 min
Jul 9, 8:22 PM CDT	Severe Thunderstorm Warning	MPX	Benton, Morrison	38 min
Jul 9, 8:25 PM CDT	Severe Thunderstorm Warning	MPX	Kanabec, Mille Lacs	40 min
Jul 9, 8:28 PM CDT	Special Weather Statement	MPX	McLeod, Scott	47 min
Jul 9, 8:33 PM CDT	Severe Thunderstorm Warning	MPX	McLeod, Renville, Sibley	42 min
Jul 9, 8:54 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Lac qui Parle, Yellow Medicine	66 min
Jul 9, 8:55 PM CDT	Severe Thunderstorm Warning	MPX	Benton, Sherburne	25 min
Jul 9, 8:56 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Le Sueur, Rice, Scott	34 min
Jul 9, 8:58 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Swift	47 min
Jul 9, 9:03 PM CDT	Severe Thunderstorm Warning	MPX	Nicollet, Sibley	42 min
Jul 9, 9:06 PM CDT	Severe Thunderstorm Warning	MPX	Kandiyohi, Pope, Stearns	27 min
Jul 9, 9:09 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Lac qui Parle, Swift	20 min
Jul 9, 9:11 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Le Sueur, Nicollet, Waseca	49 min
Jul 9, 9:16 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Hennepin, Ramsey, Washington	44 min
Jul 9, 9:23 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Rice, Scott	53 min
Jul 9, 9:26 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Brown, Nicollet	49 min
Jul 9, 9:51 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Steele, Waseca	54 min
Jul 9, 10:10 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Nicollet	35 min
Jul 9, 10:19 PM CDT	Tornado Warning	MPX	Blue Earth	41 min
Jul 9, 10:34 PM CDT	Severe Thunderstorm Warning	MPX	Nicollet, Sibley	41 min
Jul 9, 10:41 PM CDT	Severe Thunderstorm Warning	MPX	Faribault, Freeborn, Steele, Waseca	64 min
Jul 9, 10:51 PM CDT	Severe Thunderstorm Warning	MPX	McLeod, Renville, Sibley	39 min
Jul 9, 10:55 PM CDT	Severe Thunderstorm Warning	MPX	Brown, Redwood, Renville	35 min
Jul 9, 11:05 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth	40 min
Jul 9, 11:17 PM CDT	Severe Thunderstorm Warning	MPX	Faribault, Freeborn	43 min
Jul 9, 11:39 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Brown, Nicollet, Watonwan	37 min
Jul 9, 11:55 PM CDT	Severe Thunderstorm Warning	MPX	Redwood	18 min
Jul 10, 12:05 AM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Faribault, Martin	40 min
Jul 10, 12:45 AM CDT	Severe Thunderstorm Warning	MPX	Faribault, Freeborn	30 min
Jul 10, 12:47 AM CDT	Severe Thunderstorm Warning	MPX	Nicollet	26 min
Jul 10, 1:30 AM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Brown, Watonwan	35 min

Nearby

Tornado Warnings in Minnesota, 2017 Every tornado warning in 2017 Tornadoes 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.