Alert archive / Minnesota / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 148, NWS Twin Cities, MN

September 17, 20185 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 17, 2018, 4:03 PM CDT for 5 counties in Minnesota. It was in force for 27 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: Sep 17, 2018, 4:03 PM CDT (21:03 UTC)
Expired: Sep 17, 2018, 4:30 PM CDT
In force: 27 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Blue Earth County, MN, Brown County, MN, Nicollet County, MN, Sibley County, MN, Watonwan County, MN

The radar

The Minneapolis radar (KMPX), 81 km from the middle of the area, began a volume at 21:06 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 17, 4:04 PM CDT	TSTM WND GST 59	2 Wnw New Ulm, MN	MEASURED AT NEW ULM AIRPORT.

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, 9.1 hours before the alert went out and 79 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: 400 J/kg
Mixed-layer CIN: -276 J/kg
Mixed-layer LCL: 1173 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 110 m²/s²
0-3 km storm-relative helicity: 106 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

764 
WUUS53 KMPX 172103
SVRMPX
MNC013-015-103-143-165-172130-
/O.NEW.KMPX.SV.W.0148.180917T2103Z-180917T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
403 PM CDT MON SEP 17 2018

The National Weather Service in The Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Sibley County in central Minnesota...
  Eastern Brown County in south central Minnesota...
  Blue Earth County in south central Minnesota...
  Northern Watonwan County in south central Minnesota...
  Nicollet County in south central Minnesota...

* Until 430 PM CDT.

* At 403 PM CDT, a severe thunderstorm was located near Courtland, or
  near New Ulm, moving east at 55 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Mankato, New Ulm, North Mankato, St. Peter, St. James, Sleepy Eye,
  Lake Crystal, Madelia, Gaylord, Arlington, Mapleton and Winthrop.

This includes the following highways...
 U.S. Highway 14 between mile markers 89 and 134.
 U.S. Highway 169 between mile markers 29 and 59, and between mile
markers 61 and 77.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4400 9486 4407 9486 4435 9470 4445 9469
      4446 9463 4467 9463 4469 9450 4463 9449
      4463 9426 4472 9425 4472 9390 4446 9392
      4439 9396 4434 9393 4426 9403 4424 9402
      4423 9394 4385 9397
TIME...MOT...LOC 2103Z 263DEG 50KT 4431 9437 

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

AMK

3 follow-up statements

976 
WWUS53 KMPX 172113
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
413 PM CDT MON SEP 17 2018

MNC013-015-103-143-165-172130-
/O.CON.KMPX.SV.W.0148.000000T0000Z-180917T2130Z/
Sibley MN-Brown MN-Blue Earth MN-Watonwan MN-Nicollet MN-
413 PM CDT MON SEP 17 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM CDT
FOR SIBLEY...SOUTHEASTERN BROWN...BLUE EARTH...NORTHERN WATONWAN AND
NICOLLET COUNTIES...

At 411 PM CDT, a severe thunderstorm was located near Nicollet, or 13
miles east of New Ulm, moving east at 60 mph.

HAZARD...60 mph wind gusts.

SOURCE...Wind gust of 59 mph observed at New Ulm. Otherwise, radar 
         indicated.

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

Locations impacted include...
Mankato, New Ulm, North Mankato, St. Peter, St. James, Lake Crystal,
Madelia, Gaylord, Arlington, Mapleton, Winthrop and Nicollet.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4407 9486 4440 9457 4468 9459 4469 9450
      4463 9449 4463 9426 4472 9425 4472 9390
      4446 9392 4439 9396 4434 9393 4426 9403
      4424 9402 4423 9394 4385 9397 4400 9483
TIME...MOT...LOC 2111Z 263DEG 50KT 4433 9420 

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

AMK

393 
WWUS53 KMPX 172121
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
421 PM CDT MON SEP 17 2018

MNC013-015-103-143-165-172130-
/O.CON.KMPX.SV.W.0148.000000T0000Z-180917T2130Z/
Sibley MN-Brown MN-Blue Earth MN-Watonwan MN-Nicollet MN-
421 PM CDT MON SEP 17 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM CDT
FOR EASTERN SIBLEY...SOUTHEASTERN BROWN...BLUE EARTH...NORTHERN
WATONWAN AND NICOLLET COUNTIES...

At 420 PM CDT, a severe thunderstorm was located over St. Peter, or
12 miles north of Mankato, moving east at 60 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Mankato, North Mankato, St. Peter, St. James, Lake Crystal, Madelia,
Gaylord, Arlington, Mapleton, Nicollet, Henderson and Courtland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4424 9445 4437 9436 4463 9426 4472 9425
      4472 9390 4446 9392 4439 9396 4434 9393
      4426 9403 4424 9402 4423 9394 4385 9397
      4400 9483
TIME...MOT...LOC 2120Z 263DEG 50KT 4435 9401 

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

AMK

515 
WWUS53 KMPX 172127
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
427 PM CDT MON SEP 17 2018

MNC013-015-103-143-165-172137-
/O.EXP.KMPX.SV.W.0148.000000T0000Z-180917T2130Z/
Sibley MN-Brown MN-Blue Earth MN-Watonwan MN-Nicollet MN-
427 PM CDT MON SEP 17 2018

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN SIBLEY...SOUTHEASTERN
BROWN...BLUE EARTH...NORTHERN WATONWAN AND NICOLLET COUNTIES WILL
EXPIRE AT 430 PM CDT...
    
The severe thunderstorm which prompted the warning has weakened. 
Therefore, the warning will be allowed to expire.

LAT...LON 4424 9445 4437 9436 4463 9426 4472 9425
      4472 9390 4446 9392 4439 9396 4434 9393
      4426 9403 4424 9402 4423 9394 4385 9397
      4400 9483
TIME...MOT...LOC 2127Z 263DEG 50KT 4436 9392 

$$

AMK

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 17, 11:04 AM CDT	Special Weather Statement	MPX	Lac qui Parle	26 min
Sep 17, 11:30 AM CDT	Special Weather Statement	MPX	Lac qui Parle, Yellow Medicine	30 min
Sep 17, 11:52 AM CDT	Special Weather Statement	MPX	Brown, Chippewa, Kandiyohi, Redwood, Renville, Swift	38 min
Sep 17, 12:28 PM CDT	Special Weather Statement	MPX	Brown, Kandiyohi, McLeod, Meeker, Redwood, Renville and 3 more	47 min
Sep 17, 12:54 PM CDT	Special Weather Statement	MPX	Anoka, Blue Earth, Brown, Carver, Hennepin, Le Sueur and 7 more	51 min
Sep 17, 1:34 PM CDT	Special Weather Statement	MPX	Anoka, Blue Earth, Carver, Chisago, Dakota, Hennepin and 6 more	41 min
Sep 17, 2:08 PM CDT	Special Weather Statement	MPX	Dakota, Faribault, Freeborn, Goodhue, Ramsey, Rice and 3 more	67 min
Sep 17, 2:17 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Goodhue, Rice, Washington	43 min
Sep 17, 3:09 PM CDT	Special Weather Statement	MPX	Freeborn	36 min
Sep 17, 3:22 PM CDT	Special Weather Statement	MPX	Redwood, Renville	23 min
Sep 17, 3:43 PM CDT	Special Weather Statement	MPX	Brown	32 min
Sep 17, 4:40 PM CDT	Special Weather Statement	MPX	Blue Earth, Le Sueur, Waseca	35 min
Sep 17, 5:02 PM CDT	Special Weather Statement	MPX	Rice, Steele, Waseca	28 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.