Alert archive / Minnesota / Tornado Warnings in 2017

Tornado Warning 30, NWS Twin Cities, MN

July 19, 2017Brown County, Minnesota

NWS Twin Cities, MN issued this tornado warning at Jul 19, 2017, 2:51 PM CDT for Brown County, Minnesota. It was in force for 24 min. 3 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 19, 2017, 2:51 PM CDT (19:51 UTC)
Expired: Jul 19, 2017, 3:15 PM CDT
In force: 24 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

County Brown County, MN

The radar

The Minneapolis radar (KMPX), 120 km from the middle of the area, began a volume at 19:53 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 19, 3:00 PM CDT	TSTM WND DMG	4 Nw Sveadahl, MN	EMPTY SEMI TRAILER TIPPED OVER. REPORTED AT COUNTY ROAD 8 AND COUNTY ROAD 18, COMFREY, MN.
Jul 19, 3:12 PM CDT	TSTM WND DMG	Searles, MN	POWER LINES DOWN.
Jul 19, 3:25 PM CDT	TSTM WND GST 51	6 Nnw Sveadahl, MN	1.40 INCHES RAINFALL IN 55 MINUTES. 4 INCH DIAMETER TREE BRANCHES DOWN.

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 19, 12:36 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 7.9 hours before the alert went out and 118 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1964 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: -10 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

069 
WFUS53 KMPX 191951
TORMPX
MNC015-192015-
/O.NEW.KMPX.TO.W.0030.170719T1951Z-170719T2015Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Twin Cities/Chanhassen MN
251 PM CDT WED JUL 19 2017

The National Weather Service in The Twin Cities has issued a

* Tornado Warning for...
  Southern Brown County in south central Minnesota...

* Until 315 PM CDT
    
* At 250 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Springfield, or 23 miles northeast of Windom,
  moving east at 55 mph.

  HAZARD...Tornado and quarter 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...
  Hanska around 315 PM CDT. 

Other locations impacted by this tornadic thunderstorm include
Searles.

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 4411 9495 4422 9496 4424 9437 4411 9437
TIME...MOT...LOC 1950Z 275DEG 49KT 4418 9494 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 2:06 PM CDT	Severe Thunderstorm Warning	MPX	Redwood	39 min
Jul 19, 2:38 PM CDT	Severe Thunderstorm Warning	MPX	Brown, Watonwan	52 min
Jul 19, 3:11 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Brown, Nicollet, Watonwan	34 min
Jul 19, 3:38 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Le Sueur, Rice, Waseca	37 min
Jul 19, 3:50 PM CDT	Severe Thunderstorm Warning	MPX	Faribault, Martin	40 min
Jul 19, 3:57 PM CDT	Severe Thunderstorm Warning	MPX	Faribault, Freeborn	18 min
Jul 19, 4:02 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Goodhue	43 min
Jul 19, 4:06 PM CDT	Severe Thunderstorm Warning	MPX	Faribault, Freeborn, Steele, Waseca	39 min
Jul 19, 4:40 PM CDT	Severe Thunderstorm Warning	MPX	Freeborn	20 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.