Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 49, NWS Duluth, MN

July 28, 2021Itasca County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at Jul 28, 2021, 10:05 AM CDT for Itasca County, Minnesota. It was in force for 40 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
Jul 28, 2021, 10:05 AM CDT (15:05 UTC)
Expired
Jul 28, 2021, 10:45 AM CDT
In force
40 min
Issued by
NWS Duluth, MN
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

County Itasca County, MN

The radar

The Duluth radar (KDLH), 156 km from the middle of the area, began a volume at 15:05 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 28, 10:16 AM CDTHAIL 0.52 W Spring Lake, MNPEA TO HALF INCH SIZE HAIL.
Jul 28, 10:23 AM CDTHAIL 14 Sw Inger, MNOBSERVATION AT CUT FOOT SIOUX RESORT.
Jul 28, 10:30 AM CDTHAIL 0.5Squaw Lake, MN

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, 3.1 hours before the alert went out and 108 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 2021-07-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 285 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 2021-07-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 109 square meters per square second.1939587897Sfc1 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
285 J/kg
Mixed-layer CIN
-422 J/kg
Mixed-layer LCL
1229 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
109 m²/s²
0-3 km storm-relative helicity
190 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

As transmitted.

933 
WUUS53 KDLH 281505
SVRDLH
MNC061-281545-
/O.NEW.KDLH.SV.W.0049.210728T1505Z-210728T1545Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Duluth MN
1005 AM CDT Wed Jul 28 2021

The National Weather Service in Duluth MN has issued a

* Severe Thunderstorm Warning for...
  Northwestern Itasca County in north central Minnesota...

* Until 1045 AM CDT.

* At 1005 AM CDT, a severe thunderstorm was located near Alvwood, or
  32 miles northeast of Bemidji, moving east at 40 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* This severe thunderstorm will be near...
  Squaw Lake around 1015 AM CDT.
  Oslund around 1020 AM CDT.
  Inger around 1025 AM CDT.

Other locations in the path of this severe thunderstorm include
Marcell.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4780 9344 4734 9364 4758 9441 4785 9442
TIME...MOT...LOC 1505Z 280DEG 35KT 4768 9425 

HAIL...1.00IN
WIND...<50MPH
 
$$

JDS
3 follow-up statements
978 
WWUS53 KDLH 281516
SVSDLH

Severe Weather Statement
National Weather Service Duluth MN
1016 AM CDT Wed Jul 28 2021

MNC061-281545-
/O.CON.KDLH.SV.W.0049.000000T0000Z-210728T1545Z/
Itasca MN-
1016 AM CDT Wed Jul 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 AM CDT
FOR NORTHWESTERN ITASCA COUNTY...

At 1015 AM CDT, a severe thunderstorm was located over Oslund, or 38
miles east of Bemidji, moving east at 40 mph.

HAZARD...Two inch hail.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect damage 
         to roofs, siding, windows, and vehicles.

This severe storm will be near...
  Oslund around 1020 AM CDT.
  Inger around 1025 AM CDT.

Other locations in the path of this severe thunderstorm include
Marcell.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4780 9344 4734 9364 4758 9441 4785 9442
TIME...MOT...LOC 1515Z 280DEG 35KT 4766 9410 

HAIL...2.00IN
WIND...<50MPH
 
$$

JDS
176 
WWUS53 KDLH 281532
SVSDLH

Severe Weather Statement
National Weather Service Duluth MN
1032 AM CDT Wed Jul 28 2021

MNC061-281545-
/O.CON.KDLH.SV.W.0049.000000T0000Z-210728T1545Z/
Itasca MN-
1032 AM CDT Wed Jul 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 AM CDT
FOR NORTHWESTERN ITASCA COUNTY...

At 1032 AM CDT, a severe thunderstorm was located 8 miles west of
Marcell, or 31 miles northwest of Grand Rapids, moving east at 40
mph.

HAZARD...Two inch hail.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect damage 
         to roofs, siding, windows, and vehicles.

Locations impacted include...
  Marcell.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4752 9421 4763 9425 4782 9415 4773 9347
      4734 9364
TIME...MOT...LOC 1532Z 280DEG 35KT 4763 9385 

HAIL...2.00IN
WIND...<50MPH
 
$$

JDS
163 
WWUS53 KDLH 281544
SVSDLH

Severe Weather Statement
National Weather Service Duluth MN
1044 AM CDT Wed Jul 28 2021

MNC061-281554-
/O.EXP.KDLH.SV.W.0049.000000T0000Z-210728T1545Z/
Itasca MN-
1044 AM CDT Wed Jul 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN ITASCA COUNTY
WILL EXPIRE AT 1045 AM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However small hail
and heavy rain are still possible with this thunderstorm.

LAT...LON 4752 9421 4763 9425 4782 9415 4773 9347
      4734 9364
TIME...MOT...LOC 1544Z 280DEG 35KT 4761 9371 

$$

JDS

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 28, 6:15 AM CDTSpecial Weather StatementDLHCass30 min
Jul 28, 6:42 AM CDTDense Fog AdvisoryDLHCarlton, Lake, Saint Louis3 hr
Jul 28, 6:50 AM CDTMarine Dense Fog AdvisoryDLH3 hr
Jul 28, 6:53 AM CDTSpecial Weather StatementDLHCass22 min
Jul 28, 6:56 AM CDTSpecial Weather StatementDLHCrow Wing19 min
Jul 28, 9:36 AM CDTSpecial Weather StatementDLHItasca24 min
Jul 28, 9:53 AM CDTSevere Thunderstorm WarningDLHAitkin, Cass, Itasca20 min
Jul 28, 9:57 AM CDTSpecial Weather StatementDLHItasca18 min
Jul 28, 10:34 AM CDTSpecial Weather StatementDLHItasca26 min
Jul 28, 10:43 AM CDTSpecial Weather StatementDLHItasca17 min
Jul 28, 10:58 AM CDTSpecial Weather StatementDLHItasca17 min
Jul 28, 11:14 AM CDTSpecial Weather StatementDLHItasca31 min
Jul 28, 11:41 AM CDTSpecial Weather StatementDLHItasca34 min
Jul 28, 11:45 AM CDTSpecial Weather StatementDLHKoochiching30 min
Jul 28, 12:13 PM CDTSpecial Weather StatementDLHKoochiching32 min
Jul 28, 12:15 PM CDTSpecial Weather StatementDLHSaint Louis30 min
Jul 28, 12:44 PM CDTSpecial Weather StatementDLHKoochiching31 min
Jul 28, 1:29 PM CDTSpecial Weather StatementDLHSaint Louis31 min
Jul 28, 1:51 PM CDTSpecial Weather StatementDLHSaint Louis9 min
Jul 28, 1:54 PM CDTSevere Thunderstorm WarningDLHKoochiching, Saint Louis43 min
Jul 28, 2:04 PM CDTSpecial Weather StatementDLHSaint Louis11 min
Jul 28, 2:33 PM CDTSpecial Weather StatementDLH27 min
Jul 28, 2:39 PM CDTSpecial Weather StatementDLH21 min
Jul 28, 2:55 PM CDTSpecial Weather StatementDLH20 min
Jul 28, 3:16 PM CDTSpecial Weather StatementDLH29 min
Jul 28, 3:40 PM CDTSpecial Weather StatementDLHSaint Louis20 min
Jul 28, 4:31 PM CDTSpecial Weather StatementDLHSaint Louis14 min
Jul 28, 4:43 PM CDTSpecial Weather StatementDLHLake17 min
Jul 28, 6:22 PM CDTSpecial Weather StatementDLHKoochiching23 min
Jul 28, 6:43 PM CDTSpecial Weather StatementDLHKoochiching17 min
Jul 28, 6:51 PM CDTSevere Thunderstorm WarningDLHItasca, Koochiching39 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2021Every severe thunderstorm warning in 2021

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.