Alert archive / Minnesota / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 2, NWS La Crosse, WI

March 6, 2017Olmsted County, Minnesota

NWS La Crosse, WI issued this severe thunderstorm warning at Mar 6, 2017, 6:22 PM CST for Olmsted County, Minnesota. It was in force for 23 min. 9 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: Mar 6, 2017, 6:22 PM CST (00:22 UTC)
Expired: Mar 6, 2017, 6:45 PM CST
In force: 23 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Olmsted County, MN

The radar

The La Crosse radar (KARX), 105 km from the middle of the area, began a volume at 00:21 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
Mar 6, 6:26 PM CST	TSTM WND DMG	4 Nnw Genoa, MN	LARGE TREES BLOWN DOWN AND POLE BUILDING ROOFS DAMAGED. TIME ESTIMATED BY RADAR. REPORT VIA TWITTER.
Mar 6, 6:26 PM CST	TSTM WND DMG	5 Nnw Genoa, MN	LARGE TREES BLOWN DOWN AND POLE BUILDING ROOFS DAMAGED. TIME ESTIMATED BY RADAR. REPORT VIA TWITTER.
Mar 6, 6:28 PM CST	TSTM WND DMG	2 Nw Oronoco, MN	SHED BLOWN ACROSS ROAD AND TOOK OUT SOME POWER LINES.
Mar 6, 6:28 PM CST	TSTM WND DMG	2 Wnw Oronoco, MN	SHED BLOWN ACROSS ROAD AND TOOK OUT SOME POWER LINES.
Mar 6, 6:29 PM CST	HAIL 0.25	Rochester, MN	PEA SIZED HAIL IN NORTHWEST ROCHESTER.
Mar 6, 6:29 PM CST	HAIL 0.75	2 Se Oronoco, MN
Mar 6, 6:30 PM CST	TSTM WND DMG	5 Nw Genoa, MN	REPORTED AT 11144 CR 5 NW, PINE ISLAND, MN. SMALL PORTION OF ROOF PEALED OFF HOUSE ON SW CORNER VIA EAVES. DOWNED PINE TREE. .
Mar 6, 6:40 PM CST	TSTM WND GST 56	2 Nw Oronoco, MN	TWO PINE TREES OF ONE FOOT IN DIAMETER BLOWN DOWN.
Mar 6, 6:40 PM CST	TSTM WND GST 56	2 Wnw Oronoco, MN	TWO PINE TREES OF ONE FOOT IN DIAMETER BLOWN 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
Mar 6, 2:43 PM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 0.4 hours before the alert went out and 124 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: 923 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 993 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 432 m²/s²
0-3 km storm-relative helicity: 528 m²/s²
Significant tornado parameter: 2.2
Supercell composite: 10.3

Open this sounding in Storm Lab

The text

As transmitted.

350 
WUUS53 KARX 070022
SVRARX
MNC109-070045-
/O.NEW.KARX.SV.W.0002.170307T0022Z-170307T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service La Crosse WI
622 PM CST MON MAR 6 2017

The National Weather Service in La Crosse has issued a

* Severe Thunderstorm Warning for...
  Northern Olmsted County in southeastern Minnesota...

* Until 645 PM CST

* At 621 PM CST, severe thunderstorms were located along a line
  extending from near West Concord to near Byron, moving east at 60
  mph.

  HAZARD...60 mph wind gusts and penny size hail. 

  SOURCE...Radar indicated. A 53 mph wind gust was reported in 
           Kasson at 620 pm and the power was reported out. 

  IMPACT...Expect damage to roofs, siding, and trees. 

* Severe thunderstorms will be near...
  Rochester around 630 PM CST. 
  Oronoco around 635 PM CST. 
  Elgin around 640 PM CST. 

Other locations impacted by these severe thunderstorms include
Douglas, Rock Dell, Viola, Potsdam and Salem Corners.

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 1000 PM CST for southeastern
Minnesota.

LAT...LON 4419 9268 4420 9233 4411 9232 4411 9214
      4410 9213 4389 9267 4390 9268
TIME...MOT...LOC 0021Z 251DEG 51KT 4420 9280 4396 9261 

HAIL...0.75IN
WIND...60MPH
 
$$

Wetenkamp

2 follow-up statements

241 
WWUS53 KARX 070037
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
637 PM CST MON MAR 6 2017

MNC109-070045-
/O.CON.KARX.SV.W.0002.000000T0000Z-170307T0045Z/
Olmsted MN-
637 PM CST MON MAR 6 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CST
FOR NORTHERN OLMSTED COUNTY...

At 636 PM CST, severe thunderstorms were located along a line
extending from near Mazeppa to near Rochester, moving east at 55 mph.

HAZARD...60 mph wind gusts and penny size hail. 

SOURCE...Radar indicated. Pea size hail was reported in northwest 
         Rochester at 629 pm. 

IMPACT...Expect damage to roofs, siding, and trees. 

these severe thunderstorms will remain over mainly rural areas of
northern Olmsted County, including the following locations: Douglas,
Rock Dell, Viola, Potsdam and Salem Corners.

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 1000 PM CST for southeastern
Minnesota.

LAT...LON 4418 9267 4419 9233 4411 9232 4411 9231
      4410 9231 4410 9213 4389 9267
TIME...MOT...LOC 0036Z 252DEG 49KT 4428 9246 4399 9244 

HAIL...0.75IN
WIND...60MPH
 
$$

Wetenkamp

424 
WWUS53 KARX 070049
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
649 PM CST MON MAR 6 2017

MNC109-070059-
/O.EXP.KARX.SV.W.0002.000000T0000Z-170307T0045Z/
Olmsted MN-
649 PM CST MON MAR 6 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN OLMSTED COUNTY HAS
EXPIRED...
    
The storms which prompted the warning have moved out of the area.
Therefore the warning has been allowed to expire.  However gusty
winds are still possible with these thunderstorms.

A tornado watch remains in effect until 1000 PM CST for southeastern
Minnesota.

LAT...LON 4418 9267 4419 9233 4411 9232 4411 9231
      4410 9231 4410 9213 4389 9267
TIME...MOT...LOC 0049Z 270DEG 51KT 4434 9223 4405 9221 

$$

Wetenkamp

The office that day

Everything else NWS La Crosse, WI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 6, 6:25 PM CST	Special Weather Statement	ARX	Dodge, Fillmore, Mower, Olmsted, Wabasha	110 min
Mar 6, 6:32 PM CST	Severe Thunderstorm Warning	ARX	Wabasha	43 min
Mar 6, 6:57 PM CST	Severe Thunderstorm Warning	ARX	Mower	33 min
Mar 6, 7:06 PM CST	Special Weather Statement	ARX	Fillmore, Olmsted, Wabasha, Winona	114 min
Mar 6, 7:13 PM CST	Severe Thunderstorm Warning	ARX	Fillmore	62 min
Mar 6, 7:45 PM CST	Special Weather Statement	ARX	Winona	45 min
Mar 6, 8:01 PM CST	Severe Thunderstorm Warning	ARX	Fillmore, Houston, Winona	45 min
Mar 6, 8:05 PM CST	Special Weather Statement	ARX	Winona	25 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2017 Every 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.