Alert archive / Minnesota / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 81, NWS Twin Cities, MN

August 8, 2020Redwood County, Yellow Medicine County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 8, 2020, 1:14 PM CDT for Redwood County, Yellow Medicine County, Minnesota. It was in force for 46 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: Aug 8, 2020, 1:14 PM CDT (18:14 UTC)
Expired: Aug 8, 2020, 2:00 PM CDT
In force: 46 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Redwood County, MN, Yellow Medicine County, MN

The radar

The Minneapolis radar (KMPX), 149 km from the middle of the area, began a volume at 18:14 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
Aug 8, 1:28 PM CDT	TSTM WND DMG	Hanley Falls, MN	PICTURE OF LARGE TREE DOWN ON MACHINE SHED, CORN DAMAGED. TIME ESTIMATED FROM RADAR.

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, 6.2 hours before the alert went out and 146 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: 1441 J/kg
Mixed-layer CIN: -202 J/kg
Mixed-layer LCL: 776 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 250 m²/s²
0-3 km storm-relative helicity: 273 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

As transmitted.

144 
WUUS53 KMPX 081814
SVRMPX
MNC127-173-081900-
/O.NEW.KMPX.SV.W.0081.200808T1814Z-200808T1900Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
114 PM CDT Sat Aug 8 2020

The National Weather Service in The Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Redwood County in southwestern Minnesota...
  Southeastern Yellow Medicine County in west central Minnesota...

* Until 200 PM CDT.

* At 113 PM CDT, a severe thunderstorm was located near Marshall, 
  moving southeast at 50 mph. Wind gusts up to 70 mph have been 
  reported previously with this storm.

  HAZARD...70 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Redwood Falls, Wabasso, Wood Lake, Hanley Falls, Echo, Belview,
  Sanborn, Vesta, Milroy, Lucan, Seaforth and Wanda.

This includes the following highways...
 U.S. Highway 14 between mile markers 62 and 68.
 U.S. Highway 71 between mile markers 52 and 75.

This includes  Prairies Edge Casino Resort.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 4482 9568 4479 9552 4477 9551 4473 9541
      4470 9538 4469 9532 4466 9529 4467 9525
      4458 9510 4428 9510 4419 9512 4435 9559
      4462 9561 4464 9572
TIME...MOT...LOC 1813Z 295DEG 45KT 4451 9568 

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

ETA

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 8, 12:12 PM CDT	Special Weather Statement	MPX	Lac qui Parle	48 min
Aug 8, 12:38 PM CDT	Special Weather Statement	MPX	Yellow Medicine	37 min
Aug 8, 12:45 PM CDT	Severe Thunderstorm Warning	MPX	Lac qui Parle, Yellow Medicine	45 min
Aug 8, 1:37 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Renville, Yellow Medicine	23 min
Aug 8, 2:03 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Kandiyohi, Meeker, Redwood, Renville, Sibley	42 min
Aug 8, 2:14 PM CDT	Special Weather Statement	MPX	Brown, Watonwan	46 min
Aug 8, 2:28 PM CDT	Severe Thunderstorm Warning	MPX	Carver, McLeod, Meeker, Nicollet, Sibley	47 min
Aug 8, 2:48 PM CDT	Severe Thunderstorm Warning	MPX	Kandiyohi, Meeker, Renville, Sibley, Wright	27 min
Aug 8, 3:13 PM CDT	Special Weather Statement	MPX	Carver, Hennepin, McLeod, Meeker, Wright	47 min
Aug 8, 3:17 PM CDT	Special Weather Statement	MPX	Blue Earth, Le Sueur, Rice, Scott, Waseca	58 min
Aug 8, 4:11 PM CDT	Special Weather Statement	MPX	Rice, Steele, Waseca	49 min
Aug 8, 4:28 PM CDT	Severe Thunderstorm Warning	MPX	Freeborn, Steele, Waseca	47 min
Aug 8, 4:58 PM CDT	Severe Thunderstorm Warning	MPX	Goodhue, Rice, Steele	36 min
Aug 8, 5:25 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Goodhue	35 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2020 Every severe thunderstorm warning in 2020

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.