Alert archive / Minnesota / Tornado Warnings in 2017

Tornado Warning 33, NWS Twin Cities, MN

August 16, 2017Nicollet County, Sibley County, Minnesota

NWS Twin Cities, MN issued this tornado warning at Aug 16, 2017, 5:09 PM CDT for Nicollet County, Sibley County, Minnesota. It was in force for 36 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: Aug 16, 2017, 5:09 PM CDT (22:09 UTC)
Expired: Aug 16, 2017, 5:45 PM CDT
In force: 36 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Nicollet County, MN, Sibley County, MN

The radar

The Minneapolis radar (KMPX), 74 km from the middle of the area, began a volume at 22:12 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
Aug 16, 5:42 PM CDT	TORNADO	3 N New Sweden, MN	TORNADO REPORTED NEAR SIBLEY AND NICOLLET CO BORDER NEAR HWY 22, NORTH OF NEW SWEDEN.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 10.2 hours before the alert went out and 72 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: 81 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 638 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 215 m²/s²
0-3 km storm-relative helicity: 208 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

791 
WFUS53 KMPX 162209
TORMPX
MNC103-143-162245-
/O.NEW.KMPX.TO.W.0033.170816T2209Z-170816T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Twin Cities/Chanhassen MN
509 PM CDT WED AUG 16 2017

The National Weather Service in The Twin Cities has issued a

* Tornado Warning for...
  South central Sibley County in central Minnesota...
  North central Nicollet County in south central Minnesota...

* Until 545 PM CDT
    
* At 508 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Nicollet, or 10 miles east of New Ulm, moving
  north at 25 mph.

  HAZARD...Tornado. 

  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...
  Lafayette around 525 PM CDT. 

Other locations impacted by this tornadic thunderstorm include New
Sweden.

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 4432 9417 4432 9428 4451 9445 4451 9421
TIME...MOT...LOC 2208Z 163DEG 21KT 4436 9426 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

jrb

1 follow-up statement

463 
WWUS53 KMPX 162218
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
518 PM CDT WED AUG 16 2017

MNC103-143-162245-
/O.CON.KMPX.TO.W.0033.000000T0000Z-170816T2245Z/
Sibley MN-Nicollet MN-
518 PM CDT WED AUG 16 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 545 PM CDT FOR SOUTH
CENTRAL SIBLEY AND NORTH CENTRAL NICOLLET COUNTIES...
    
At 518 PM CDT, a severe thunderstorm capable of producing a tornado
was located 7 miles southwest of New Sweden, or 10 miles northeast of
New Ulm, moving north at 20 mph.

HAZARD...Tornado. 

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...
  Lafayette around 535 PM CDT. 

Other locations impacted by this tornadic thunderstorm include New
Sweden.

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 4432 9417 4432 9428 4451 9445 4451 9421
TIME...MOT...LOC 2218Z 162DEG 17KT 4437 9427 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

jrb

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 16, 4:37 PM CDT	Tornado Warning	MPX	Blue Earth, Nicollet	23 min
Aug 16, 5:14 PM CDT	Tornado Warning Tornado observed	MPX	Nicollet	46 min
Aug 16, 5:35 PM CDT	Tornado Warning Tornado observed	MPX	Sibley	55 min
Aug 16, 6:05 PM CDT	Tornado Warning Tornado observed	MPX	Sibley	40 min
Aug 16, 6:29 PM CDT	Tornado Warning	MPX	McLeod, Sibley	46 min
Aug 16, 6:31 PM CDT	Tornado Warning	MPX	Le Sueur, Rice	44 min
Aug 16, 6:41 PM CDT	Tornado Warning	MPX	Sibley	38 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.