Alert archive / Minnesota / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 71, NWS Twin Cities, MN

July 18, 20206 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 18, 2020, 12:44 AM CDT for 6 counties in Minnesota. It was in force for 61 min. 5 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
Jul 18, 2020, 12:44 AM CDT (05:44 UTC)
Expired
Jul 18, 2020, 1:45 AM CDT
In force
61 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
0.75 in
Wind
70.0 mph

Counties Chippewa County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Renville County, MN, Swift County, MN, Yellow Medicine County, MN

The radar

The Minneapolis radar (KMPX), 165 km from the middle of the area, began a volume at 05:46 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

TimeReportWhereRemark
Jul 18, 1:15 AM CDTTSTM WND GST 524 S Granite Falls, MNAWOS STATION KGDB GRANITE FALLS AP.
Jul 18, 1:15 AM CDTTSTM WND GST 55Hanley Falls, MNMNDOT RWIS ALONG HIGHWAY 23.
Jul 18, 1:20 AM CDTTSTM WND DMGWillmar, MNCORRECTS PREVIOUS TSTM WND DMG REPORT FROM WILLMAR. TREE AND NUMEROUS LARGE BRANCHES DOWN. TIME BASED ON RADAR AND AWOS.
Jul 18, 1:20 AM CDTTSTM WND DMGWillmar, MNTREE AND NUMEROUS LARGE BRANCHES DOWN. TIE BASED ON RADAR AND AWOS.
Jul 18, 1:20 AM CDTTSTM WND GST 55Hanley Falls, MNMESONET STATION MN033 HANLEY FALLS MN-23 MILE POST 94.

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.

IssuedProductOfficeLasted
Jul 17, 5:39 PM CDTSevere Thunderstorm Watch PDSSPC8 hr
Jul 17, 10:25 PM CDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 5.7 hours before the alert went out and 163 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-pSkew-T log-p diagram, Minneapolis, MN at 00:00Z on 2020-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1995 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 00:00Z on 2020-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1995 J/kg
Mixed-layer CIN
-87 J/kg
Mixed-layer LCL
1267 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
218 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.8

Open this sounding in Storm Lab

The text

As transmitted.

826 
WUUS53 KMPX 180544
SVRMPX
MNC023-067-073-129-151-173-180645-
/O.NEW.KMPX.SV.W.0071.200718T0544Z-200718T0645Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Twin Cities/Chanhassen MN
1244 AM CDT Sat Jul 18 2020

The National Weather Service in The Twin Cities has issued a

* Severe Thunderstorm Warning for...
  Lac qui Parle County in west central Minnesota...
  Chippewa County in west central Minnesota...
  Yellow Medicine County in west central Minnesota...
  Southern Swift County in west central Minnesota...
  Northwestern Renville County in central Minnesota...
  Kandiyohi County in central Minnesota...

* Until 145 AM CDT.

* At 1244 AM CDT, severe thunderstorms were located along a line
  extending from near Revillo to 7 miles west of Milan to 8 miles
  northeast of Kerkhoven, moving southeast at 55 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  Willmar, New London and Spicer around 1255 AM CDT.
  Watson around 100 AM CDT.
  Montevideo around 105 AM CDT.
  Canby and Atwater around 110 AM CDT.
  Granite Falls, Maynard and Porter around 120 AM CDT.
  Sacred Heart around 130 AM CDT.
  Renville around 135 AM CDT.

Other locations impacted by these severe thunderstorms include
Nassau, Asbury, Willmar Airport, Blomkest, St. Leo, Lake Lillian, 
Green Lake, Madison Airport, Hazel Run and Cerro Gordo. This also 
includes Prairies Edge Casino Resort.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4515 9645 4520 9619 4518 9610 4522 9610
      4532 9529 4534 9498 4532 9477 4479 9475
      4469 9531 4470 9536 4468 9536 4463 9561
      4463 9645
TIME...MOT...LOC 0544Z 303DEG 46KT 4497 9662 4508 9606 4526 9518 

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

BORGHOFF
1 follow-up statement
939 
WWUS53 KMPX 180621
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
121 AM CDT Sat Jul 18 2020

MNC151-180630-
/O.CAN.KMPX.SV.W.0071.000000T0000Z-200718T0645Z/
Swift MN-
121 AM CDT Sat Jul 18 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN SWIFT COUNTY IS
CANCELLED...

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

A Severe Thunderstorm Watch remains in effect until 200 AM CDT for
central and west central Minnesota. A Severe Thunderstorm Watch also
remains in effect until 600 AM CDT for central, southwestern and west
central Minnesota.

LAT...LON 4484 9645 4498 9572 4527 9494 4523 9477
      4479 9475 4469 9531 4470 9536 4468 9536
      4463 9561 4463 9645
TIME...MOT...LOC 0620Z 301DEG 40KT 4473 9634 4487 9558 4521 9495 

$$

MNC023-067-073-129-173-180645-
/O.CON.KMPX.SV.W.0071.000000T0000Z-200718T0645Z/
Lac qui Parle MN-Chippewa MN-Yellow Medicine MN-Renville MN-
Kandiyohi MN-
121 AM CDT Sat Jul 18 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 145 AM CDT
FOR SOUTHERN LAC QUI PARLE...EASTERN CHIPPEWA...YELLOW MEDICINE...
NORTHWESTERN RENVILLE AND KANDIYOHI COUNTIES...

At 120 AM CDT, severe thunderstorms were located along a line
extending from near Canby to near Granite Falls to Spicer, moving
southeast at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

These severe storms will be near...
  Granite Falls, New London, Spicer and Maynard around 125 AM CDT.
  Atwater around 135 AM CDT.
  Sacred Heart around 140 AM CDT.
  Renville around 145 AM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4484 9645 4498 9572 4527 9494 4523 9477
      4479 9475 4469 9531 4470 9536 4468 9536
      4463 9561 4463 9645
TIME...MOT...LOC 0620Z 301DEG 40KT 4473 9634 4487 9558 4521 9495 

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

BORGHOFF

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 17, 9:08 PM CDTSpecial Weather StatementMPXDouglas67 min
Jul 17, 9:22 PM CDTSevere Thunderstorm WarningMPXTodd53 min
Jul 17, 10:13 PM CDTSevere Thunderstorm WarningMPXMorrison, Todd62 min
Jul 17, 10:16 PM CDTTornado WarningMPXMorrison, Todd44 min
Jul 17, 10:20 PM CDTSevere Thunderstorm WarningMPXDouglas55 min
Jul 17, 10:54 PM CDTSevere Thunderstorm WarningMPXDouglas, Pope, Stevens66 min
Jul 17, 10:58 PM CDTSevere Thunderstorm WarningMPXMille Lacs, Morrison, Stearns, Todd77 min
Jul 17, 11:51 PM CDTTornado WarningMPXPope, Stearns, Swift28 min
Jul 17, 11:58 PM CDTSevere Thunderstorm WarningMPXBenton, Kandiyohi, Morrison, Stearns77 min
Jul 18, 12:13 AM CDTSpecial Weather StatementMPXKanabec, Mille Lacs62 min
Jul 18, 12:26 AM CDTSevere Thunderstorm WarningMPXBenton, Isanti, Meeker, Mille Lacs, Sherburne, Stearns and 1 more49 min
Jul 18, 12:32 AM CDTSpecial Weather StatementMPXLac qui Parle, Swift43 min
Jul 18, 1:03 AM CDTTornado WarningMPXChisago, Isanti, Kanabec27 min
Jul 18, 1:16 AM CDTSevere Thunderstorm WarningMPXKandiyohi, Meeker, Stearns44 min
Jul 18, 1:19 AM CDTSpecial Weather StatementMPXAnoka, Chisago, Hennepin, Isanti, Wright56 min
Jul 18, 1:38 AM CDTSpecial Weather StatementMPXMcLeod, Meeker, Redwood, Renville52 min
Jul 18, 3:03 AM CDTSevere Thunderstorm WarningMPXCarver, Dakota, Hennepin, Scott, Washington42 min
Jul 18, 3:43 AM CDTSpecial Weather StatementMPXGoodhue, Rice32 min
Jul 18, 4:06 AM CDTSpecial Weather StatementMPXWatonwan39 min
Jul 18, 5:09 AM CDTSpecial Weather StatementMPXFreeborn, Steele, Waseca66 min
Jul 18, 5:00 PM CDTSpecial Weather StatementMPXAnoka30 min
Jul 18, 5:23 PM CDTSevere Thunderstorm WarningMPXAnoka52 min
Jul 18, 5:48 PM CDTTornado WarningMPXAnoka42 min
Jul 18, 6:07 PM CDTTornado WarningMPXWashington38 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2020Every 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.