Alert archive / Michigan / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 98, NWS Northern Indiana

August 12, 2021Branch County, Hillsdale County, Michigan; Steuben County, Indiana

NWS Northern Indiana issued this severe thunderstorm warning at Aug 12, 2021, 6:12 AM EDT for Branch County, Hillsdale County, Michigan; Steuben County, Indiana. It was in force for 33 min. 6 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: Aug 12, 2021, 6:12 AM EDT (10:12 UTC)
Expired: Aug 12, 2021, 6:45 AM EDT
In force: 33 min
Issued by: NWS Northern Indiana
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Steuben County, IN, Branch County, MI, Hillsdale County, MI

The radar

The Northern Indiana radar (KIWX), 112 km from the middle of the area, began a volume at 10:12 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 12, 6:18 AM EDT	TSTM WND DMG	Lake Wilson, MI	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM LAKE WILSON. TREE TOPS SNAPPED AND TREES UP-ROOTED. WIRES DOWN. TIME IS ESTIMATED FROM RADAR.
Aug 12, 6:18 AM EDT	TSTM WND DMG	Lake Wilson, MI	NUMEROUS BRANCHES DOWN. ESTIMATED 12-14IN DIAMETER BRANCH DOWN DAMAGING A CAR. TREE UPROOTED. PHOTOS VIA EMAIL.
Aug 12, 6:20 AM EDT	TSTM WND DMG	Lake Wilson, MI	TREE TOPS SNAPPED AND TREES UP-ROOTED. WIRES DOWN. TIME IS ESTIMATED FROM RADAR.
Aug 12, 6:23 AM EDT	TSTM WND DMG	Hillsdale, MI	REPORT FROM MPING: 3-INCH TREE LIMBS BROKEN; POWER POLES BROKEN.
Aug 12, 6:25 AM EDT	TSTM WND DMG	Hillsdale, MI	MULTIPLE TREES DOWN IN THE TOWN OF HILLSDALE RELAYED VIA FACEBOOK.
Aug 12, 6:30 AM EDT	TSTM WND GST 54	3 E Hillsdale, MI

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Detroit, MI (KDTX), launched 00:00Z, 10.2 hours before the alert went out and 130 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: 12 J/kg
Mixed-layer CIN: -458 J/kg
Mixed-layer LCL: 1474 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 243 m²/s²
0-3 km storm-relative helicity: 373 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

114 
WUUS53 KIWX 121012
SVRIWX
INC151-MIC023-059-121045-
/O.NEW.KIWX.SV.W.0098.210812T1012Z-210812T1045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Northern Indiana
612 AM EDT Thu Aug 12 2021

The National Weather Service in Northern Indiana has issued a

* Severe Thunderstorm Warning for...
  Northeastern Steuben County in northeastern Indiana...
  Eastern Branch County in southwestern Michigan...
  Hillsdale County in southeastern Michigan...

* Until 645 AM EDT.

* At 612 AM EDT, severe thunderstorms were located along a line
  extending from near Litchfield to near Fremont, moving northeast at
  60 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  Litchfield around 615 AM EDT.
  Jonesville around 620 AM EDT.
  Hillsdale around 625 AM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a DANGEROUS SITUATION. These storms are producing widespread
wind damage across Branch county. SEEK SHELTER NOW inside a
sturdy structure and stay away from windows!
 
&&

LAT...LON 4184 8436 4171 8486 4207 8488 4207 8437
TIME...MOT...LOC 1012Z 235DEG 54KT 4200 8482 4177 8484 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

JBALL

1 follow-up statement

919 
WWUS53 KIWX 121042
SVSIWX

Severe Weather Statement
National Weather Service Northern Indiana
642 AM EDT Thu Aug 12 2021

INC151-MIC023-059-121052-
/O.EXP.KIWX.SV.W.0098.000000T0000Z-210812T1045Z/
Steuben IN-Branch MI-Hillsdale MI-
642 AM EDT Thu Aug 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN STEUBEN...EASTERN
BRANCH AND HILLSDALE COUNTIES WILL EXPIRE AT 645 AM EDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with these thunderstorms through 7 am EDT.

LAT...LON 4184 8436 4171 8486 4207 8488 4207 8437
TIME...MOT...LOC 1042Z 235DEG 54KT 4225 8435 4202 8437 

$$

JBALL

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 11:04 PM EDT	Special Weather Statement	IWX	Hillsdale	26 min
Aug 12, 3:17 AM EDT	Heat Advisory	IWX	Branch, Cass, Hillsdale, Saint Joseph	17 hr
Aug 12, 3:35 AM EDT	Special Weather Statement	IWX	Branch	25 min
Aug 12, 5:52 AM EDT	Severe Thunderstorm Warning	IWX	Branch, Hillsdale, Saint Joseph	23 min
Aug 12, 4:04 AM EDT	Special Weather Statement	IWX	LaPorte, Starke	26 min
Aug 12, 4:15 AM EDT	Special Marine Warning	IWX		30 min
Aug 12, 4:28 AM EDT	Special Weather Statement	IWX	LaPorte, Marshall, Starke	32 min
Aug 12, 5:15 AM EDT	Special Weather Statement	IWX	Elkhart, LaGrange	45 min
Aug 12, 5:49 AM EDT	Severe Thunderstorm Warning	IWX	Fulton, Pulaski	41 min
Aug 12, 6:16 AM EDT	Special Weather Statement	IWX	Fulton, Marshall	44 min
Aug 12, 6:21 AM EDT	Severe Thunderstorm Warning Considerable damage threat	IWX	Fulton, Kosciusko, Marshall	39 min
Aug 12, 6:40 AM EDT	Special Weather Statement	IWX	Whitley	35 min
Aug 12, 7:02 AM EDT	Severe Thunderstorm Warning	IWX	Elkhart, Kosciusko, Noble	43 min
Aug 12, 7:15 AM EDT	Special Weather Statement	IWX	Allen, DeKalb	30 min
Aug 12, 7:31 AM EDT	Special Weather Statement	IWX	Noble	44 min
Aug 12, 7:44 AM EDT	Special Weather Statement	IWX	DeKalb	46 min
Aug 12, 7:52 AM EDT	Special Weather Statement	IWX	LaGrange	38 min
Aug 12, 8:15 AM EDT	Special Weather Statement	IWX	Steuben	30 min

Nearby

Severe Thunderstorm Warnings in Michigan, 2021 Severe Thunderstorm Warnings in Indiana, 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.