Alert archive / Minnesota / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 149, NWS Twin Cities, MN

September 20, 20184 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 20, 2018, 5:30 PM CDT for 4 counties in Minnesota. It was in force for 45 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: Sep 20, 2018, 5:30 PM CDT (22:30 UTC)
Expired: Sep 20, 2018, 6:15 PM CDT
In force: 45 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Blue Earth County, MN, Faribault County, MN, Martin County, MN, Watonwan County, MN

The radar

The Minneapolis radar (KMPX), 156 km from the middle of the area, began a volume at 22:31 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, 5:38 PM CDT	TSTM WND DMG	Ceylon, MN	NUMEROUS TREES DOWN.
Sep 20, 5:44 PM CDT	TSTM WND DMG	Welcome, MN	NUMEROUS LARGE BRANCHES DOWN.
Sep 20, 5:49 PM CDT	TSTM WND DMG	Ceylon, MN	PHOTOS RELAYED VIA TWITTER OF LARGE BROKEN TREE BRANCHES, TREES DOWN, AND AN OUTBUILDING DESTROYED.
Sep 20, 5:50 PM CDT	TSTM WND DMG	Granada, MN	HOUSE PUSHED OFF FOUNDATION. TREES DOWN.
Sep 20, 5:52 PM CDT	TORNADO	Granada, MN	EF1 TORNADO TRACKED 6.5 MILES.
Sep 20, 5:52 PM CDT	TORNADO	Granada, MN	CORRECTS PREVIOUS TORNADO REPORT FROM GRANADA. VIDEO OF TORNADO RELAYED BY SECONDHAND SOURCE VIA TWITTER. SEVERAL HOUSES DAMAGED NEAR GRANADA.
Sep 20, 5:52 PM CDT	TORNADO	Granada, MN	VIDEO OF TORNADO RELAYED BY SECONDHAND SOURCE VIA TWITTER.
Sep 20, 6:05 PM CDT	TSTM WND DMG	Fairmont, MN	TREE DOWN.
Sep 20, 6:14 PM CDT	TSTM WND DMG	4 Sse Winnebago, MN	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 4 SSE WINNEBAGO. FARIBAULT COUNTY EM CALLED IN TO REPORT NUMEROUS TREES SNAPPED AND DOWN AT GOLF COURSE.

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, 10.5 hours before the alert went out and 155 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.

376 
WUUS53 KMPX 202230
SVRMPX
MNC013-043-091-165-202315-
/O.NEW.KMPX.SV.W.0149.180920T2230Z-180920T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
530 PM CDT THU SEP 20 2018

The National Weather Service in The Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Western Faribault County in south central Minnesota...
  Martin County in south central Minnesota...
  Southwestern Blue Earth County in south central Minnesota...
  Southeastern Watonwan County in south central Minnesota...

* Until 615 PM CDT.

* At 530 PM CDT, severe thunderstorms were located along a line
  extending from Jackson In Jackson County to near Estherville,
  moving northeast at 75 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  Sherburn, Ceylon and Okamanpedan Lake around 540 PM CDT.
  Trimont and Welcome around 545 PM CDT.
  Fairmont around 550 PM CDT.
  Truman around 555 PM CDT.
  Lewisville around 600 PM CDT.
  Winnebago and Amboy around 605 PM CDT.
  Delavan around 610 PM CDT.

Other locations impacted by these severe thunderstorms include
Fairmont Airport, Huntley, East Chain, Imogene, Dunnell, Wilbert,
Foxlake, Northrop, Granada and Guckeen.

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 1100 PM CDT for south central
Minnesota.

LAT...LON 4350 9485 4357 9486 4373 9485 4405 9425
      4363 9390 4350 9434
TIME...MOT...LOC 2230Z 235DEG 65KT 4360 9499 4344 9484 

HAIL...<.75IN
WIND...60MPH
 
$$

BORGHOFF

3 follow-up statements

163 
WWUS53 KMPX 202242
SVSMPX

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

MNC013-043-091-165-202315-
/O.CON.KMPX.SV.W.0149.000000T0000Z-180920T2315Z/
Faribault MN-Martin MN-Blue Earth MN-Watonwan MN-
542 PM CDT THU SEP 20 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CDT
FOR WESTERN FARIBAULT...MARTIN...SOUTHWESTERN BLUE EARTH AND
SOUTHEASTERN WATONWAN COUNTIES...

At 541 PM CDT, severe thunderstorms were located along a line
extending from near Sherburn to Okamanpedan State Park, moving
northeast at 75 mph.

These are very dangerous storms.

HAZARD...80 mph wind gusts. Estherville, Iowa gusted to 75 mph.

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...
  Fairmont and Iowa Lake around 545 PM CDT.
  Truman around 555 PM CDT.
  Blue Earth, Winnebago and Lewisville around 600 PM CDT.
  Amboy around 605 PM CDT.
  Delavan around 610 PM CDT.

Other locations impacted by these severe thunderstorms include
Fairmont Airport, Huntley, East Chain, Imogene, Dunnell, Wilbert,
Foxlake, Northrop, Granada and Guckeen.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

This is an EXTREMELY DANGEROUS SITUATION with tornado like wind
speeds expected. Mobile homes and high profile vehicles are
especially susceptible to winds of this magnitude and may be
overturned. For your protection move to an interior room on the
lowest floor of a building. These storms have the potential to cause
serious injury and significant property damage.

&&

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

LAT...LON 4350 9485 4357 9486 4373 9485 4405 9425
      4363 9390 4350 9434
TIME...MOT...LOC 2241Z 239DEG 66KT 4370 9477 4349 9456 

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

BORGHOFF

211 
WWUS53 KMPX 202252
SVSMPX

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

MNC013-043-091-165-202315-
/O.CON.KMPX.SV.W.0149.000000T0000Z-180920T2315Z/
Faribault MN-Martin MN-Blue Earth MN-Watonwan MN-
552 PM CDT THU SEP 20 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CDT
FOR WESTERN FARIBAULT...MARTIN...SOUTHWESTERN BLUE EARTH AND
SOUTHEASTERN WATONWAN COUNTIES...

At 552 PM CDT, severe thunderstorms were located along a line
extending from near Truman to Fairmont Airport to East Chain, moving
northeast at 75 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...
  Blue Earth and Lewisville around 600 PM CDT.
  Winnebago and Amboy around 605 PM CDT.
  Delavan around 610 PM CDT.

Other locations impacted by these severe thunderstorms include
Fairmont Airport, Huntley, East Chain, Imogene, Wilbert, Northrop,
Granada, Guckeen and South Branch.

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 4350 9459 4361 9456 4380 9472 4405 9425
      4363 9390 4350 9434
TIME...MOT...LOC 2252Z 237DEG 65KT 4380 9453 4368 9442 4356 9429 

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

BORGHOFF

711 
WWUS53 KMPX 202309
SVSMPX

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

MNC091-165-202318-
/O.CAN.KMPX.SV.W.0149.000000T0000Z-180920T2315Z/
Martin MN-Watonwan MN-
609 PM CDT THU SEP 20 2018

...THE SEVERE THUNDERSTORM WARNING FOR MARTIN AND SOUTHEASTERN
WATONWAN COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

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

LAT...LON 4353 9424 4374 9423 4377 9426 4384 9425
      4385 9432 4391 9437 4395 9436 4405 9425
      4363 9390
TIME...MOT...LOC 2308Z 235DEG 65KT 4395 9424 4383 9413 4371 9400 

$$

MNC013-043-202315-
/O.CON.KMPX.SV.W.0149.000000T0000Z-180920T2315Z/
Faribault MN-Blue Earth MN-
609 PM CDT THU SEP 20 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CDT
FOR WESTERN FARIBAULT AND SOUTHWESTERN BLUE EARTH COUNTIES...

At 608 PM CDT, severe thunderstorms were located along a line
extending from near Vernon Center to near Amboy to near Delavan,
moving northeast at 75 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 thunderstorms will remain over mainly rural areas of
western Faribault and southwestern Blue Earth Counties, including the
following locations... Huntley and Guckeen.

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 4353 9424 4374 9423 4377 9426 4384 9425
      4385 9432 4391 9437 4395 9436 4405 9425
      4363 9390
TIME...MOT...LOC 2308Z 235DEG 65KT 4395 9424 4383 9413 4371 9400 

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

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, 5:51 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, 5:59 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Faribault, Waseca	46 min
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.