Alert archive / Michigan / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 21, NWS Northern Indiana

June 20, 2021Berrien County, Cass County, Michigan

NWS Northern Indiana issued this severe thunderstorm warning at Jun 20, 2021, 6:58 PM EDT for Berrien County, Cass County, Michigan. It was in force for 28 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: Jun 20, 2021, 6:58 PM EDT (22:58 UTC)
Expired: Jun 20, 2021, 7:26 PM EDT
In force: 28 min
Issued by: NWS Northern Indiana
Area: Storm-based polygon
Hail: 2.75 in
Wind: 60.0 mph

Counties Berrien County, MI, Cass County, MI

The radar

The Northern Indiana radar (KIWX), 89 km from the middle of the area, began a volume at 23:00 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
Jun 20, 7:00 PM EDT	HAIL 1	3 Ese Berrien Springs, MI
Jun 20, 7:00 PM EDT	HAIL 1.5	1 Se Berrien Springs, MI	CORRECTS TIME AND SIZE OF PREVIOUS HAIL REPORT FROM 1 SE BERRIEN SPRINGS.
Jun 20, 7:05 PM EDT	HAIL 2	Eau Claire, MI
Jun 20, 7:15 PM EDT	HAIL 0.75	Sandy Beach, MI	REPORT FROM MPING: DIME (0.75 IN.).

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.

Issued	Product	Office	Lasted
Jun 20, 6:06 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 11.0 hours before the alert went out and 242 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: 46 J/kg
Mixed-layer CIN: -265 J/kg
Mixed-layer LCL: 737 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 77 m²/s²
0-3 km storm-relative helicity: 157 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

As transmitted.

848 
WUUS53 KIWX 202258
SVRIWX
MIC021-027-202345-
/O.NEW.KIWX.SV.W.0021.210620T2258Z-210620T2345Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Northern Indiana
658 PM EDT Sun Jun 20 2021

The National Weather Service in Northern Indiana has issued a

* Severe Thunderstorm Warning for...
  Northwestern Cass County in southwestern Michigan...
  Eastern Berrien County in southwestern Michigan...

* Until 745 PM EDT.

* At 657 PM EDT, a severe thunderstorm was located over Berrien
  Springs, or 7 miles north of Niles, moving northeast at 40 mph.

  This is a very dangerous storm.

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

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  Dowagiac around 710 PM EDT.
  Watervliet and Paw Paw Lake around 725 PM EDT.

Other locations impacted by this severe thunderstorm include Magician
Lake, Spinks Corners, Dewey Lake, Eau Claire, Sumnerville, Pokagon,
Indian Lake and Sandy Beach.

This includes Interstate 94 in Michigan between mile markers 39 and
42.
 
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.

&&

LAT...LON 4207 8622 4207 8604 4182 8622 4189 8644
      4224 8627 4224 8622
TIME...MOT...LOC 2257Z 203DEG 34KT 4193 8629 

HAIL...2.75IN
WIND...60MPH
 
$$

JBALL

2 follow-up statements

918 
WWUS53 KIWX 202311
SVSIWX

Severe Weather Statement
National Weather Service Northern Indiana
711 PM EDT Sun Jun 20 2021

MIC021-027-202345-
/O.CON.KIWX.SV.W.0021.000000T0000Z-210620T2345Z/
Cass MI-Berrien MI-
711 PM EDT Sun Jun 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM EDT
FOR NORTHWESTERN CASS AND NORTHEASTERN BERRIEN COUNTIES...

At 710 PM EDT, a severe thunderstorm was located 7 miles northwest of
Dowagiac, moving northeast at 40 mph.

This is a very dangerous storm.

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

SOURCE...Radar indicated.

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

This severe storm will be near...
  Watervliet and Paw Paw Lake around 725 PM EDT.

Other locations impacted by this severe thunderstorm include Magician
Lake, Spinks Corners, Dewey Lake, Eau Claire, Sumnerville, Pokagon,
Indian Lake and Sandy Beach.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4207 8622 4207 8604 4187 8618 4193 8639
      4224 8627 4224 8622
TIME...MOT...LOC 2310Z 203DEG 34KT 4205 8622 

HAIL...2.75IN
WIND...60MPH
 
$$

Brown

573 
WWUS53 KIWX 202326
SVSIWX

Severe Weather Statement
National Weather Service Northern Indiana
726 PM EDT Sun Jun 20 2021

MIC021-027-202336-
/O.CAN.KIWX.SV.W.0021.000000T0000Z-210620T2345Z/
Cass MI-Berrien MI-
726 PM EDT Sun Jun 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CASS AND
NORTHEASTERN BERRIEN COUNTIES IS CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.  However heavy rain is
still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 100 AM EDT for
southwestern Michigan.

LAT...LON 4207 8622 4207 8604 4187 8618 4193 8639
      4224 8627 4224 8622
TIME...MOT...LOC 2323Z 203DEG 34KT 4220 8614 

$$

Brown

The office that day

Everything else NWS Northern Indiana issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 19, 8:20 PM EDT	Severe Thunderstorm Warning	IWX	Cass, Saint Joseph	40 min
Jun 19, 8:51 PM EDT	Areal Flood Advisory	IWX	Cass, Saint Joseph	3 hr
Jun 19, 9:21 PM EDT	Severe Thunderstorm Warning	IWX	Branch, Hillsdale	39 min
Jun 19, 9:59 PM EDT	Severe Thunderstorm Warning	IWX	Hillsdale	17 min
Jun 20, 5:12 AM EDT	Beach Hazards Statement	IWX		49 hr
Jun 20, 6:42 PM EDT	Severe Thunderstorm Warning	IWX	Cass	26 min
Jun 20, 7:19 PM EDT	Severe Thunderstorm Warning	IWX	Saint Joseph	41 min
Jun 20, 7:29 PM EDT	Severe Thunderstorm Warning	IWX	Hillsdale	31 min
Jun 20, 7:49 PM EDT	Severe Thunderstorm Warning	IWX	Hillsdale	26 min
Jun 20, 7:58 PM EDT	Severe Thunderstorm Warning	IWX	Branch, Saint Joseph	32 min

Nearby

Severe Thunderstorm Warnings in Michigan, 2021 Every 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.