Alert archive / Michigan / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 78, NWS Northern Indiana

August 10, 2021Berrien County, Cass County, Michigan

NWS Northern Indiana issued this severe thunderstorm warning at Aug 10, 2021, 10:03 PM EDT for Berrien County, Cass County, Michigan. It was in force for 27 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 10, 2021, 10:03 PM EDT (02:03 UTC)
Expired: Aug 10, 2021, 10:30 PM EDT
In force: 27 min
Issued by: NWS Northern Indiana
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Berrien County, MI, Cass County, MI

The radar

The Northern Indiana radar (KIWX), 99 km from the middle of the area, began a volume at 02:02 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 10, 10:15 PM EDT	TSTM WND DMG	Berrien Springs, MI	NUMEROUS TREES DOWN ACROSS THE ENTIRE COUNTY.

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
Aug 10, 8:38 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Detroit, MI (KDTX), launched 00:00Z, 2.1 hours before the alert went out and 249 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: 2462 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 962 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 207 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 3.7

Open this sounding in Storm Lab

The text

As transmitted.

801 
WUUS53 KIWX 110203
SVRIWX
MIC021-027-110230-
/O.NEW.KIWX.SV.W.0078.210811T0203Z-210811T0230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Northern Indiana
1003 PM EDT Tue Aug 10 2021

The National Weather Service in Northern Indiana has issued a

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

* Until 1030 PM EDT.

* At 1002 PM EDT, a severe thunderstorm was located over Benton
  Harbor, moving northeast at 35 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...
  Niles, Benton Harbor, St. Joseph, Dowagiac, Fair Plain, Benton
  Heights, Berrien Springs, Watervliet, Coloma, Paw Paw Lake, Lake
  Michigan Beach, Pokagon, Sodus, Riverside, Shoreham, Eau Claire,
  Magician Lake, Dewey Lake, Sumnerville and Indian Lake.

This includes the following highways...
 Interstate 196 between mile markers 0 and 7.
 Interstate 94 in Michigan between mile markers 26 and 42.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4207 8622 4207 8602 4184 8625 4210 8655
      4213 8653 4211 8650 4212 8649 4219 8641
      4224 8636 4224 8622
TIME...MOT...LOC 0202Z 233DEG 32KT 4211 8644 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

PBM

1 follow-up statement

580 
WWUS53 KIWX 110229
SVSIWX

Severe Weather Statement
National Weather Service Northern Indiana
1029 PM EDT Tue Aug 10 2021

MIC021-027-110239-
/O.EXP.KIWX.SV.W.0078.000000T0000Z-210811T0230Z/
Cass MI-Berrien MI-
1029 PM EDT Tue Aug 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CASS AND
NORTHEASTERN BERRIEN COUNTIES WILL EXPIRE AT 1030 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 300 AM EDT for
southwestern Michigan.

LAT...LON 4207 8622 4207 8602 4184 8625 4210 8655
      4213 8653 4211 8650 4212 8649 4219 8641
      4224 8636 4224 8622
TIME...MOT...LOC 0229Z 233DEG 32KT 4225 8619 

$$

PBM

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 9:49 PM EDT	Special Weather Statement	IWX	Berrien	41 min
Aug 10, 9:56 PM EDT	Severe Thunderstorm Warning	IWX	Berrien	49 min
Aug 10, 10:18 PM EDT	Severe Thunderstorm Warning	IWX	Berrien, Cass	57 min
Aug 10, 10:42 PM EDT	Severe Thunderstorm Warning	IWX	Cass, Saint Joseph	48 min
Aug 10, 11:31 PM EDT	Special Weather Statement	IWX	Branch, Hillsdale	29 min
Aug 11, 1:10 PM EDT	Special Weather Statement	IWX	Cass, Saint Joseph	50 min
Aug 11, 1:39 PM EDT	Severe Thunderstorm Warning	IWX	Branch, Hillsdale, Saint Joseph	36 min
Aug 11, 2:02 PM EDT	Severe Thunderstorm Warning	IWX	Branch, Hillsdale	43 min
Aug 11, 2:44 PM EDT	Severe Thunderstorm Warning	IWX	Hillsdale	46 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.