Alert archive / Minnesota / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 151, NWS Twin Cities, MN

September 20, 20185 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Sep 20, 2018, 6:13 PM CDT for 5 counties in Minnesota. It was in force for 47 min. 3 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, 6:13 PM CDT (23:13 UTC)
Expired: Sep 20, 2018, 7:00 PM CDT
In force: 47 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Carver County, MN, Dakota County, MN, Hennepin County, MN, Ramsey County, MN, Scott County, MN

The radar

The Minneapolis radar (KMPX), 20 km from the middle of the area, began a volume at 23:15 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, 6:24 PM CDT	TSTM WND DMG	1 E Mound, MN	RELAYED BY EM.
Sep 20, 6:34 PM CDT	TSTM WND DMG	1 Nne Minnetonka, MN	RELAYED BY EM.
Sep 20, 6:50 PM CDT	TSTM WND DMG	Farmington, MN	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, 11.2 hours before the alert went out and 22 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.

697 
WUUS53 KMPX 202313
SVRMPX
MNC019-037-053-123-139-210000-
/O.NEW.KMPX.SV.W.0151.180920T2313Z-180921T0000Z/

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

The National Weather Service in The Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Hennepin County in east central Minnesota...
  Western Dakota County in east central Minnesota...
  Scott County in east central Minnesota...
  Southeastern Carver County in east central Minnesota...
  Western Ramsey County in east central Minnesota...

* Until 700 PM CDT.

* At 613 PM CDT, severe thunderstorms were located along a line
  extending from Independence to near Heidelberg, moving east at 70
  mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Minneapolis, St. Paul, Bloomington, Brooklyn Park, Plymouth, Eagan,
  Maple Grove, Eden Prairie, Burnsville, Lakeville, Minnetonka and
  Apple Valley.

This includes Interstate 35 between mile markers 75 and 80.
 
This includes  Mystic Lake Casino.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

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

LAT...LON 4454 9328 4455 9373 4504 9374 4510 9328
      4504 9328 4504 9323 4511 9322 4512 9312
      4456 9306 4453 9328
TIME...MOT...LOC 2313Z 257DEG 62KT 4501 9373 4447 9371 

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

JLT

2 follow-up statements

377 
WWUS53 KMPX 202324
SVSMPX

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

MNC019-037-053-123-139-210000-
/O.CON.KMPX.SV.W.0151.000000T0000Z-180921T0000Z/
Hennepin MN-Dakota MN-Scott MN-Carver MN-Ramsey MN-
624 PM CDT THU SEP 20 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM CDT
FOR HENNEPIN...WESTERN DAKOTA...SCOTT...SOUTHEASTERN CARVER AND
WESTERN RAMSEY COUNTIES...

At 624 PM CDT, severe thunderstorms were located along a line
extending from Loretto to Chaska to St Benedict, moving northeast at
70 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Minneapolis, St. Paul, Bloomington, Brooklyn Park, Plymouth, Eagan,
Maple Grove, Eden Prairie, Burnsville, Lakeville, Minnetonka and
Apple Valley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

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

LAT...LON 4454 9328 4455 9373 4504 9374 4510 9328
      4504 9328 4504 9323 4511 9322 4512 9312
      4456 9306 4453 9328
TIME...MOT...LOC 2324Z 227DEG 60KT 4505 9367 4480 9358 4457 9364 

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

JLT

286 
WWUS53 KMPX 202349
SVSMPX

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

MNC019-202359-
/O.CAN.KMPX.SV.W.0151.000000T0000Z-180921T0000Z/
Carver MN-
649 PM CDT THU SEP 20 2018

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CARVER COUNTY 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
and east central Minnesota.

LAT...LON 4454 9328 4455 9336 4508 9338 4510 9328
      4504 9328 4504 9323 4511 9322 4512 9312
      4456 9306 4453 9328
TIME...MOT...LOC 2349Z 247DEG 42KT 4513 9316 4485 9316 4462 9322 

$$

MNC037-053-123-139-210000-
/O.CON.KMPX.SV.W.0151.000000T0000Z-180921T0000Z/
Hennepin MN-Dakota MN-Scott MN-Ramsey MN-
649 PM CDT THU SEP 20 2018

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM CDT
FOR SOUTHEASTERN HENNEPIN...WESTERN DAKOTA...EASTERN SCOTT AND
WESTERN RAMSEY COUNTIES...

At 649 PM CDT, severe thunderstorms were located along a line
extending from Circle Pines to South St Paul Airport to Lakeville
Airport, moving northeast at 50 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Minneapolis, St. Paul, Bloomington, Brooklyn Park, Eagan, Burnsville,
Lakeville, Apple Valley, Edina, St. Louis Park, Richfield and Inver
Grove Heights.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

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

LAT...LON 4454 9328 4455 9336 4508 9338 4510 9328
      4504 9328 4504 9323 4511 9322 4512 9312
      4456 9306 4453 9328
TIME...MOT...LOC 2349Z 247DEG 42KT 4513 9316 4485 9316 4462 9322 

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

JLT

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