Alert archive / Minnesota / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 99, NWS Twin Cities, MN

July 12, 2018Dakota County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 12, 2018, 6:47 PM CDT for Dakota County, Minnesota. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 12, 2018, 6:47 PM CDT (23:47 UTC)
Expired: Jul 12, 2018, 7:18 PM CDT
In force: 31 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Dakota County, MN

The radar

The Minneapolis radar (KMPX), 56 km from the middle of the area, began a volume at 23:50 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 12, 5:04 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.8 hours before the alert went out and 59 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: 745 J/kg
Mixed-layer CIN: -244 J/kg
Mixed-layer LCL: 1291 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 387 m²/s²
0-3 km storm-relative helicity: 437 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.3

Open this sounding in Storm Lab

The text

As transmitted.

936 
WUUS53 KMPX 122347
SVRMPX
MNC037-130030-
/O.NEW.KMPX.SV.W.0099.180712T2347Z-180713T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
647 PM CDT THU JUL 12 2018

The National Weather Service in The Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Southern Dakota County in east central Minnesota...

* Until 730 PM CDT.

* At 647 PM CDT, a severe thunderstorm was located over Vermillion,
  or 16 miles northeast of Northfield, moving southeast at 30 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Cottage Grove, Hastings, Rosemount, Farmington, Cannon Falls,
  Castle Rock, Hampton, Randolph, Vermillion, Coates, Miesville and
  New Trier.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4456 9324 4478 9298 4478 9289 4475 9285
      4475 9282 4471 9273 4463 9273 4463 9279
      4454 9280 4454 9291 4451 9292 4452 9300
      4450 9305
TIME...MOT...LOC 2347Z 298DEG 26KT 4466 9300 

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

JRB

1 follow-up statement

422 
WWUS53 KMPX 130018
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
718 PM CDT THU JUL 12 2018

MNC037-130028-
/O.CAN.KMPX.SV.W.0099.000000T0000Z-180713T0030Z/
Dakota MN-
718 PM CDT THU JUL 12 2018

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN DAKOTA COUNTY IS
CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.  However gusty winds and
heavy rain are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until midnight CDT for
southeastern and east central Minnesota.

LAT...LON 4456 9324 4478 9298 4478 9289 4475 9285
      4475 9282 4471 9273 4463 9273 4463 9279
      4454 9280 4454 9291 4451 9292 4452 9300
      4450 9305
TIME...MOT...LOC 0016Z 298DEG 26KT 4455 9272 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 4:37 AM CDT	Special Weather Statement	MPX	Kanabec	113 min
Jul 12, 6:46 AM CDT	Special Weather Statement	MPX	Kanabec	3 hr
Jul 12, 7:06 AM CDT	Flash Flood Warning	MPX	Kanabec, Mille Lacs	3 hr
Jul 12, 10:26 AM CDT	Areal Flood Warning	MPX	Kanabec, Mille Lacs	6 hr
Jul 12, 10:43 AM CDT	Special Weather Statement	MPX	Isanti, Sherburne	32 min
Jul 12, 11:16 AM CDT	Special Weather Statement	MPX	Chisago	29 min
Jul 12, 2:42 PM CDT	Flash Flood Watch	MPX	Blue Earth, Brown, Faribault, Martin, Nicollet, Redwood and 1 more	16 hr
Jul 12, 4:38 PM CDT	Special Weather Statement	MPX	Anoka	52 min
Jul 12, 4:43 PM CDT	Special Weather Statement	MPX	Hennepin	47 min
Jul 12, 4:46 PM CDT	Special Weather Statement	MPX	Redwood	74 min
Jul 12, 5:10 PM CDT	Special Weather Statement	MPX	Brown, Carver, Hennepin, McLeod, Ramsey, Sibley	65 min
Jul 12, 5:18 PM CDT	Severe Thunderstorm Warning	MPX	Chisago, Washington	27 min
Jul 12, 5:27 PM CDT	Severe Thunderstorm Warning	MPX	Carver, Hennepin	33 min
Jul 12, 5:43 PM CDT	Severe Thunderstorm Warning	MPX	Carver, Scott	47 min
Jul 12, 5:54 PM CDT	Special Weather Statement	MPX	Ramsey	51 min
Jul 12, 6:02 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Hennepin	43 min
Jul 12, 6:14 PM CDT	Special Weather Statement	MPX	Brown	46 min
Jul 12, 6:27 PM CDT	Special Weather Statement	MPX	Brown	93 min
Jul 12, 6:40 PM CDT	Special Weather Statement	MPX	Dakota	50 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.