Alert archive / Minnesota / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 150, NWS Twin Cities, MN

September 20, 2018Blue Earth County, Faribault County, Waseca County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 20, 2018, 5:59 PM CDT for Blue Earth County, Faribault County, Waseca County, Minnesota. It was in force for 46 min. 13 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: Sep 20, 2018, 5:59 PM CDT (22:59 UTC)
Expired: Sep 20, 2018, 6:45 PM CDT
In force: 46 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 80.0 mph

Counties Blue Earth County, MN, Faribault County, MN, Waseca County, MN

The radar

The Minneapolis radar (KMPX), 102 km from the middle of the area, began a volume at 23:00 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
Sep 20, 6:05 PM CDT	TSTM WND DMG	2 Sw Skyline, MN	TREE DOWN ON PROPANE TANK.
Sep 20, 6:10 PM CDT	TSTM WND GST 67	2 Ese Skyline, MN	MESONET STATION AS022, SKYLINE 2E.
Sep 20, 6:15 PM CDT	TSTM WND DMG	1 Nne Madison Lake, MN	FEW TREES AND POWER LINES DOWN,.
Sep 20, 6:15 PM CDT	TSTM WND DMG	2 E Madison Lake, MN	TREES AND POWER LINES DOWN.
Sep 20, 6:15 PM CDT	TSTM WND DMG	3 Wsw Smiths Mill, MN	FEW TREES AND POWER LINES DOWN.
Sep 20, 6:17 PM CDT	TSTM WND GST 70	4 Nnw Eagle Lake, MN	AWOS STATION MKT, MANKATO AP.
Sep 20, 6:19 PM CDT	TORNADO	1 Ne Smiths Mill, MN	EF1 TORNADO TRACKED 6.8 MILES.
Sep 20, 6:20 PM CDT	TORNADO	2 S Elysian, MN	HOUSE DAMAGED. RADAR DEBRIS SIGNATURE IN THE SAME AREA. TORNADO REPORTED VIA HAM RADIO.
Sep 20, 6:22 PM CDT	TORNADO	5 E Janesville, MN	NARROW EF0 TRACK THROUGH CORN FOR 0.8 MILES.
Sep 20, 6:23 PM CDT	TORNADO	2 N Waldorf, MN	EF1 TORNADO TRACKED 27 MILES AND ENDED EAST OF OWATONNA.
Sep 20, 6:26 PM CDT	TSTM WND DMG	1 Ne Smiths Mill, MN	PHONE CALL TO RELAY THAT A HOUSE WAS DESTROYED. NO PHOTO PROVIDED.
Sep 20, 6:28 PM CDT	TSTM WND DMG	Easton, MN	CORRECTS TIME - EASTON. FARIBAULT COUNTY EM CALLED TO REPORT NUMEROUS TREES AND POWER LINES DOWN.
Sep 20, 6:28 PM CDT	TSTM WND DMG	Easton, MN	CORRECT TIME - EASTON. FARIBAULT COUNTY EM CALLED TO REPORT NUMEROUS TREES AND POWER LINES 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
Sep 20, 3:33 PM CDT	Tornado Watch	SPC	4 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.0 hours before the alert went out and 101 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: 18 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 461 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 195 m²/s²
0-3 km storm-relative helicity: 20 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted.

510 
WUUS53 KMPX 202259
SVRMPX
MNC013-043-161-202345-
/O.NEW.KMPX.SV.W.0150.180920T2259Z-180920T2345Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
559 PM CDT THU SEP 20 2018

The National Weather Service in The Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Faribault County in south central Minnesota...
  Blue Earth County in south central Minnesota...
  Western Waseca County in south central Minnesota...

* Until 645 PM CDT.

* At 559 PM CDT, severe thunderstorms were located along a line
  extending from Truman to near Huntley to near Ledyard, moving
  northeast at 70 mph.

  These are very dangerous storms.

  HAZARD...80 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be heavily damaged. Expect 
           considerable damage to roofs, windows, and vehicles. 
           Extensive tree damage and power outages are likely.

* Severe thunderstorms will be near...
  Amboy and Vernon Center around 610 PM CDT.
  Lake Crystal, Mapleton, Good Thunder and Frost around 615 PM CDT.
  Mankato, Easton and Delavan around 620 PM CDT.
  Wells, St. Clair, Minnesota Lake and Pemberton around 625 PM CDT.
  Eagle Lake, Janesville and Madison Lake around 630 PM CDT.
  Elysian and Waldorf around 635 PM CDT.

Other locations impacted by these severe thunderstorms include
Kiester, Skyline, Alma City, Mankato Airport, Matawan, Baroda, Brush
Creek, Walters, Garden City and Smiths Mill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is an EXTREMELY DANGEROUS SITUATION. These storms are producing 
widespread wind damage. SEEK SHELTER NOW inside a sturdy structure 
and stay away from windows!

&&

A Tornado Watch remains in effect until 1100 PM CDT for south central
Minnesota.

LAT...LON 4372 9405 4387 9419 4392 9436 4423 9431
      4416 9406 4417 9401 4422 9403 4424 9401
      4424 9377 4420 9376 4420 9353 4385 9360
      4383 9365 4350 9365 4350 9417
TIME...MOT...LOC 2259Z 222DEG 63KT 4385 9443 4373 9422 4347 9424 

HAIL...<.75IN
WIND...80MPH
 
$$

BORGHOFF

2 follow-up statements

374 
WWUS53 KMPX 202307
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
607 PM CDT THU SEP 20 2018

MNC013-043-161-202345-
/O.CON.KMPX.SV.W.0150.000000T0000Z-180920T2345Z/
Faribault MN-Blue Earth MN-Waseca MN-
607 PM CDT THU SEP 20 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR FARIBAULT...BLUE EARTH AND WESTERN WASECA COUNTIES...

At 607 PM CDT, severe thunderstorms were located along a line
extending from 6 miles east of Lewisville to near Amboy to near Blue
Earth to near Elmore, moving northeast at 65 mph.

These are very dangerous storms.

HAZARD...80 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be heavily damaged. Expect 
         considerable damage to roofs, windows, and vehicles. 
         Extensive tree damage and power outages are likely.

These severe storms will be near...
  Mapleton and Easton around 615 PM CDT.
  Minnesota Lake and Good Thunder around 620 PM CDT.
  Mankato and Pemberton around 625 PM CDT.
  Eagle Lake, Wells, Janesville, St. Clair and Waldorf around 630 PM 
  CDT.
  Madison Lake around 635 PM CDT.
  Elysian around 640 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

&&

A Tornado Watch remains in effect until 1100 PM CDT for south central
Minnesota.

LAT...LON 4372 9405 4387 9419 4392 9436 4423 9431
      4416 9406 4417 9401 4422 9403 4424 9401
      4424 9377 4420 9376 4420 9353 4385 9360
      4383 9365 4350 9365 4350 9417
TIME...MOT...LOC 2307Z 234DEG 58KT 4394 9431 4382 9410 4368 9402 4357
9412

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...80MPH
 
$$

BORGHOFF

462 
WWUS53 KMPX 202325
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
625 PM CDT THU SEP 20 2018

MNC013-043-161-202345-
/O.CON.KMPX.SV.W.0150.000000T0000Z-180920T2345Z/
Faribault MN-Blue Earth MN-Waseca MN-
625 PM CDT THU SEP 20 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR EASTERN FARIBAULT...EASTERN BLUE EARTH AND WESTERN WASECA
COUNTIES...

At 625 PM CDT, severe thunderstorms were located along a line
extending from near Lake Jefferson to near Janesville to near
Pemberton to Wells to Bricelyn, moving east at 70 mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

These severe storms will be near...
  Elysian around 630 PM CDT.

Other locations impacted by these severe thunderstorms include Alma
City, Mankato Airport, Matawan, Baroda, Brush Creek, Walters, Smiths
Mill and Waseca Airport.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

&&

A Tornado Watch remains in effect until 1100 PM CDT for south central
Minnesota.

LAT...LON 4361 9365 4350 9382 4350 9396 4384 9391
      4403 9387 4423 9393 4424 9392 4424 9377
      4420 9376 4420 9353 4385 9360 4383 9365
TIME...MOT...LOC 2325Z 251DEG 61KT 4428 9373 4415 9365 4397 9381 4374
9372 4356 9381

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...70MPH
 
$$

BORGHOFF

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 20, 12:13 PM CDT	Special Weather Statement	MPX	Brown, Nicollet	32 min
Sep 20, 12:53 PM CDT	Special Weather Statement	MPX	Brown	37 min
Sep 20, 1:33 PM CDT	Special Weather Statement	MPX	Le Sueur, Scott	42 min
Sep 20, 1:49 PM CDT	Special Weather Statement	MPX	Dakota	26 min
Sep 20, 2:07 PM CDT	Special Weather Statement	MPX	Rice, Washington	38 min
Sep 20, 2:31 PM CDT	Special Weather Statement	MPX	Ramsey	119 min
Sep 20, 2:46 PM CDT	River Flood Warning	MPX	Redwood	9 days
Sep 20, 3:00 PM CDT	Special Weather Statement	MPX	Yellow Medicine	30 min
Sep 20, 3:24 PM CDT	Special Weather Statement	MPX	Renville	36 min
Sep 20, 4:50 PM CDT	Special Weather Statement	MPX	Ramsey	85 min
Sep 20, 5:21 PM CDT	Special Weather Statement	MPX	Hennepin, Ramsey	54 min
Sep 20, 5:30 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Faribault, Martin, Watonwan	45 min
Sep 20, 5:51 PM CDT	Special Weather Statement	MPX	Carver, Le Sueur, Nicollet, Sibley	24 min
Sep 20, 5:54 PM CDT	Areal Flood Warning	MPX	Anoka, Carver, Dakota, Hennepin, Ramsey, Scott and 2 more	3 hr
Sep 20, 6:13 PM CDT	Severe Thunderstorm Warning	MPX	Carver, Dakota, Hennepin, Ramsey, Scott	47 min
Sep 20, 6:15 PM CDT	Severe Thunderstorm Warning	MPX	Carver	15 min
Sep 20, 6:19 PM CDT	Tornado Warning	MPX	Le Sueur, Rice, Waseca	41 min
Sep 20, 6:23 PM CDT	Severe Thunderstorm Warning	MPX	Freeborn, Le Sueur, Rice, Steele, Waseca	52 min
Sep 20, 6:40 PM CDT	Tornado Warning	MPX	Goodhue, Rice, Steele	35 min
Sep 20, 6:41 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Dakota, Goodhue, Hennepin, Ramsey, Washington	34 min
Sep 20, 6:49 PM CDT	Tornado Warning Tornado observed	MPX	Dakota, Goodhue, Rice	41 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2018 Every severe thunderstorm warning in 2018

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.