Alert archive / Minnesota / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 21, NWS Duluth, MN

July 5, 2020Saint Louis County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at Jul 5, 2020, 4:03 PM CDT for Saint Louis County, Minnesota. It was in force for 27 min. 4 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 5, 2020, 4:03 PM CDT (21:03 UTC)
Expired
Jul 5, 2020, 4:30 PM CDT
In force
27 min
Issued by
NWS Duluth, MN
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Saint Louis County, MN

The radar

The Duluth radar (KDLH), 22 km from the middle of the area, began a volume at 21:05 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 5, 4:15 PM CDTTSTM WND DMG2 Ne Island Lake, MNTREE ON ROADWAY. TIME ESTIMATED BY RADAR.
Jul 5, 4:20 PM CDTHAIL 1.54 Se Island Lake, MNPEA TO ONE AND ONE-HALF INCH HAIL.
Jul 5, 4:23 PM CDTHAIL 1.54 Ese Island Lake, MNHAIL RANGING FROM PEA SIZED TO 1-1.5 INCHES.
Jul 5, 4:27 PM CDTHAIL 0.74 Ese Island Lake, MNPEA TO DIME SIZE HAIL. 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

International Fa, MN (KINL), launched 12:00Z, 9.1 hours before the alert went out and 195 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, International Fa, MN at 12:00Z on 2020-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1481 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, International Fa, MN at 12:00Z on 2020-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 63 square meters per square second.19395878Sfc1 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
1481 J/kg
Mixed-layer CIN
-48 J/kg
Mixed-layer LCL
1016 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
63 m²/s²
0-3 km storm-relative helicity
98 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.3

Open this sounding in Storm Lab

The text

As transmitted.

878 
WUUS53 KDLH 052103
SVRDLH
MNC137-052130-
/O.NEW.KDLH.SV.W.0021.200705T2103Z-200705T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Duluth MN
403 PM CDT Sun Jul 5 2020

The National Weather Service in Duluth MN has issued a

* Severe Thunderstorm Warning for...
  Southeastern St. Louis County in northeastern Minnesota...

* Until 430 PM CDT.

* At 403 PM CDT, a severe thunderstorm was located near Boulder Lake,
  or 19 miles north of Duluth, moving south at 20 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Boulder Lake, Island Lake, City of Rice Lake, Fredenberg, and
  Lakewood Twp.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4710 9224 4715 9198 4696 9183 4687 9203
      4691 9221
TIME...MOT...LOC 2103Z 342DEG 18KT 4706 9208 

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

Wolfe
1 follow-up statement
162 
WWUS53 KDLH 052114
SVSDLH

Severe Weather Statement
National Weather Service Duluth MN
414 PM CDT Sun Jul 5 2020

MNC137-052130-
/O.CON.KDLH.SV.W.0021.000000T0000Z-200705T2130Z/
St. Louis MN-
414 PM CDT Sun Jul 5 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM CDT
FOR SOUTHEASTERN ST. LOUIS COUNTY...

At 413 PM CDT, a severe thunderstorm was located near Island Lake, or
15 miles north of Duluth, moving south at 20 mph.

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

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Island Lake, City of Rice Lake, Boulder Lake, and Lakewood Twp. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4704 9220 4708 9194 4696 9183 4687 9203
      4691 9221
TIME...MOT...LOC 2113Z 342DEG 18KT 4701 9206 

HAIL...1.00IN
WIND...60MPH
 
$$

Wolfe

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 4, 7:05 PM CDTSpecial Weather StatementDLHSaint Louis10 min
Jul 4, 7:58 PM CDTSpecial Weather StatementDLH17 min
Jul 4, 10:13 PM CDTSpecial Weather StatementDLHKoochiching17 min
Jul 4, 10:28 PM CDTSpecial Weather StatementDLH17 min
Jul 4, 10:45 PM CDTSpecial Weather StatementDLH15 min
Jul 5, 1:35 AM CDTSpecial Weather StatementDLH10 min
Jul 5, 12:15 PM CDTSpecial Weather StatementDLHLake15 min
Jul 5, 12:38 PM CDTSevere Thunderstorm WarningDLHLake, Saint Louis37 min
Jul 5, 1:09 PM CDTSevere Thunderstorm WarningDLHLake51 min
Jul 5, 2:35 PM CDTSpecial Weather StatementDLHLake of the Woods10 min
Jul 5, 2:52 PM CDTSpecial Weather StatementDLH8 min
Jul 5, 3:13 PM CDTSpecial Weather StatementDLHKoochiching17 min
Jul 5, 3:30 PM CDTSevere Thunderstorm WarningDLHKoochiching30 min
Jul 5, 3:59 PM CDTAreal Flood AdvisoryDLHSaint Louis3 hr
Jul 5, 4:10 PM CDTSpecial Marine WarningDLH65 min
Jul 5, 4:31 PM CDTSevere Thunderstorm WarningDLHSaint Louis23 min
Jul 5, 5:08 PM CDTSevere Thunderstorm WarningDLHSaint Louis52 min
Jul 5, 5:27 PM CDTSevere Thunderstorm WarningDLHKoochiching, Saint Louis26 min
Jul 5, 6:14 PM CDTSevere Thunderstorm WarningDLHSaint Louis46 min
Jul 5, 6:31 PM CDTSevere Thunderstorm WarningDLHSaint Louis29 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.