Alert archive / Minnesota / Tornado Warnings in 2017

Tornado Warning 40, NWS Twin Cities, MN

August 16, 2017Carver County, Hennepin County, Scott County, Minnesota

NWS Twin Cities, MN issued this tornado warning at Aug 16, 2017, 7:42 PM CDT for Carver County, Hennepin County, Scott County, Minnesota. It was in force for 20 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, 7:42 PM CDT (00:42 UTC)
Expired: Aug 16, 2017, 8:02 PM CDT
In force: 20 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Carver County, MN, Hennepin County, MN, Scott County, MN

The radar

The Minneapolis radar (KMPX), 11 km from the middle of the area, began a volume at 00:47 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, 7:46 PM CDT	TORNADO	2 Wnw Prior Lake, MN	TORNADO DEVELOPED NEAR THE INTERSECTION OF 154TH ST. NW AND MYSTIC LAKE DRIVE AND TRACKED 1.2 MILES NORTHWEST. FENCING AND TENTS WERE BLOWN OVER, TREES WERE UPROOTED, AND A FISH HOUSE WAS SPUN AROUND. MAXIMUM ESTIMATED WIND 70 MPH.

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
Aug 16, 7:00 PM CDT	Tornado Watch	SPC	3 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 0.7 hours before the alert went out and 13 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: 445 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 756 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 217 m²/s²
0-3 km storm-relative helicity: 238 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.6

Open this sounding in Storm Lab

The text

As transmitted.

360 
WFUS53 KMPX 170042
TORMPX
MNC019-053-139-170130-
/O.NEW.KMPX.TO.W.0040.170817T0042Z-170817T0130Z/

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

The National Weather Service in The Twin Cities has issued a

* Tornado Warning for...
  South central Hennepin County in east central Minnesota...
  Northeastern Scott County in east central Minnesota...
  East central Carver County in east central Minnesota...

* Until 830 PM CDT
    
* At 742 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Prior Lake, or 19 miles southwest of Minneapolis,
  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...
  Shakopee and Carver around 800 PM CDT. 
  Eden Prairie and Chaska around 815 PM CDT. 
  Chanhassen around 820 PM CDT. 
  Hopkins, Victoria and Excelsior around 825 PM CDT. 
  Minnetonka around 830 PM CDT. 

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 4469 9338 4467 9351 4488 9373 4494 9340
TIME...MOT...LOC 0042Z 161DEG 18KT 4472 9346 

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

$$

BORGHOFF

3 follow-up statements

682 
WWUS53 KMPX 170047
SVSMPX

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

MNC019-053-139-170130-
/O.CON.KMPX.TO.W.0040.000000T0000Z-170817T0130Z/
Hennepin MN-Scott MN-Carver MN-
747 PM CDT WED AUG 16 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 830 PM CDT FOR SOUTH
CENTRAL HENNEPIN...NORTHEASTERN SCOTT AND EAST CENTRAL CARVER
COUNTIES...
        
At 747 PM CDT, a confirmed tornado was located over Shakopee, or 17
miles southwest of Minneapolis, moving north at 20 mph.

HAZARD...Damaging tornado. 

SOURCE...Radar confirmed tornado. 

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 tornado will be near...
  Carver around 800 PM CDT. 
  Eden Prairie and Chaska around 815 PM CDT. 
  Chanhassen, Victoria and Excelsior around 820 PM CDT. 
  Hopkins around 825 PM CDT. 
  Minnetonka around 830 PM CDT. 

Other locations impacted by this tornadic thunderstorm include
Marystown, Flying Cloud Airport, Greenwood, Shorewood and Deephaven.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. 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 4469 9338 4467 9351 4488 9373 4494 9340
TIME...MOT...LOC 0047Z 161DEG 18KT 4475 9347 

TORNADO...OBSERVED
HAIL...<.75IN

$$

BORGHOFF

003 
WWUS53 KMPX 170053
SVSMPX

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

MNC019-053-139-170130-
/O.CON.KMPX.TO.W.0040.000000T0000Z-170817T0130Z/
Hennepin MN-Scott MN-Carver MN-
753 PM CDT WED AUG 16 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 830 PM CDT FOR SOUTH
CENTRAL HENNEPIN...NORTH CENTRAL SCOTT AND EAST CENTRAL CARVER
COUNTIES...
    
At 753 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Shakopee, or 18 miles southwest of Minneapolis,
moving northwest 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...
  Carver around 805 PM CDT. 
  Eden Prairie around 810 PM CDT. 
  Chaska around 820 PM CDT. 
  Chanhassen, Victoria and Excelsior around 825 PM CDT. 

Other locations impacted by this tornadic thunderstorm include
Marystown, Flying Cloud Airport, Greenwood, Shorewood and Deephaven.

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 4474 9344 4472 9354 4488 9373 4493 9345
TIME...MOT...LOC 0053Z 147DEG 17KT 4476 9351 

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

$$

BORGHOFF

027 
WWUS53 KMPX 170102
SVSMPX

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

MNC019-053-139-170112-
/O.CAN.KMPX.TO.W.0040.000000T0000Z-170817T0130Z/
Hennepin MN-Scott MN-Carver MN-
802 PM CDT WED AUG 16 2017

...THE TORNADO WARNING FOR SOUTH CENTRAL HENNEPIN...NORTH CENTRAL
SCOTT AND EAST CENTRAL CARVER COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore the warning has been cancelled.

A tornado watch remains in effect until 1000 PM CDT for east central
Minnesota.

LAT...LON 4474 9344 4472 9354 4488 9373 4493 9345
TIME...MOT...LOC 0101Z 161DEG 18KT 4480 9353 

$$

BORGHOFF

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 16, 7:29 PM CDT	Special Weather Statement	MPX	Carver, McLeod, Scott	61 min
Aug 16, 7:49 PM CDT	Flood Watch	MPX	Benton, Chippewa, Douglas, Kandiyohi, Lac qui Parle, McLeod and 13 more	12 hr
Aug 16, 7:59 PM CDT	Tornado Warning	MPX	Carver, McLeod	31 min
Aug 16, 8:13 PM CDT	Flash Flood Warning	MPX	Carver, Hennepin, Scott	3 hr
Aug 16, 10:42 PM CDT	Areal Flood Warning	MPX	Chippewa, Kandiyohi, Lac qui Parle, Redwood, Renville, Swift and 1 more	9 hr
Aug 16, 11:57 PM CDT	Special Weather Statement	MPX	Renville	48 min
Aug 17, 1:03 AM CDT	Flash Flood Warning	MPX	Redwood, Renville	4 hr
Aug 17, 1:31 AM CDT	Special Weather Statement	MPX	Renville	44 min
Aug 17, 2:04 AM CDT	High Wind Warning	MPX	Brown, Nicollet, Sibley	88 min
Aug 17, 3:32 AM CDT	Wind Advisory	MPX	Blue Earth, Brown, Carver, Dakota, Goodhue, Le Sueur and 10 more	4 hr

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.