Alert archive / Michigan / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 38, NWS Northern Indiana

June 21, 2021Branch County, Cass County, Saint Joseph County, Michigan

NWS Northern Indiana issued this severe thunderstorm warning at Jun 21, 2021, 1:58 AM EDT for Branch County, Cass County, Saint Joseph County, Michigan. It was in force for 34 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: Jun 21, 2021, 1:58 AM EDT (05:58 UTC)
Expired: Jun 21, 2021, 2:32 AM EDT
In force: 34 min
Issued by: NWS Northern Indiana
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Branch County, MI, Cass County, MI, Saint Joseph County, MI

The radar

The Northern Indiana radar (KIWX), 68 km from the middle of the area, began a volume at 05:59 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 21, 2:15 AM EDT	TSTM WND GST 45	2 Sw Fishers Lake, MI	AWOS STATION KHAI THREE RIVERS.

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 21, 1:00 AM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Detroit, MI (KDTX), launched 00:00Z, 6.0 hours before the alert went out and 189 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: 133 J/kg
Mixed-layer CIN: -112 J/kg
Mixed-layer LCL: 1501 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

050 
WUUS53 KIWX 210558
SVRIWX
MIC023-027-149-210645-
/O.NEW.KIWX.SV.W.0038.210621T0558Z-210621T0645Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Northern Indiana
158 AM EDT Mon Jun 21 2021

The National Weather Service in Northern Indiana has issued a

* Severe Thunderstorm Warning for...
  Eastern Cass County in southwestern Michigan...
  St. Joseph County in southwestern Michigan...
  Northwestern Branch County in southwestern Michigan...

* Until 245 AM EDT.

* At 158 AM EDT, severe thunderstorms were located along a line
  extending from Schoolcraft to near Three Rivers to 7 miles north of
  Bristol, moving east at 50 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Sturgis, Three Rivers, Constantine, Centreville, Marcellus, Colon,
  Nottawa, Flowerfield, Leonidas, Mendon, Sherwood, Vandalia, Donnell
  Lake, Fishers Lake, Jones, Corey Lake, Shavehead Lake, Clear Lake,
  Wakelee and Moore Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4195 8522 4181 8539 4182 8603 4207 8584
      4207 8519
TIME...MOT...LOC 0558Z 267DEG 42KT 4210 8561 4199 8567 4183 8583 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

MARSILI

2 follow-up statements

904 
WWUS53 KIWX 210611
SVSIWX

Severe Weather Statement
National Weather Service Northern Indiana
211 AM EDT Mon Jun 21 2021

MIC023-027-149-210645-
/O.CON.KIWX.SV.W.0038.000000T0000Z-210621T0645Z/
Cass MI-St. Joseph MI-Branch MI-
211 AM EDT Mon Jun 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 AM EDT
FOR EASTERN CASS...ST. JOSEPH AND NORTHWESTERN BRANCH COUNTIES...

At 211 AM EDT, severe thunderstorms were located along a line
extending from 6 miles east of Vicksburg to near Centreville to
Constantine, moving east at 50 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Sturgis, Three Rivers, Constantine, Centreville, Marcellus, Colon,
Nottawa, Flowerfield, Leonidas, Mendon, Sherwood, Vandalia, Donnell
Lake, Fishers Lake, Jones, Corey Lake, Shavehead Lake, Clear Lake,
Wakelee and Moore Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4195 8522 4181 8539 4182 8603 4207 8584
      4207 8519
TIME...MOT...LOC 0611Z 267DEG 42KT 4211 8541 4200 8547 4184 8564 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

MARSILI

869 
WWUS53 KIWX 210632
SVSIWX

Severe Weather Statement
National Weather Service Northern Indiana
232 AM EDT Mon Jun 21 2021

MIC023-027-149-210642-
/O.CAN.KIWX.SV.W.0038.000000T0000Z-210621T0645Z/
Cass MI-St. Joseph MI-Branch MI-
232 AM EDT Mon Jun 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN CASS...ST. JOSEPH AND
NORTHWESTERN BRANCH COUNTIES IS CANCELLED...
            
The storms which prompted the warning have weakened below severe
limits. Therefore, the warning has been cancelled.  However gusty 
winds are still possible with these thunderstorms through 315 AM EDT.

A Severe Thunderstorm Watch remains in effect until 600 AM EDT for
southwestern Michigan.

LAT...LON 4195 8522 4181 8539 4182 8603 4207 8584
      4207 8519
TIME...MOT...LOC 0630Z 267DEG 42KT 4212 8511 4201 8517 4185 8534 

$$

MARSILI

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 20, 8:11 PM EDT	Severe Thunderstorm Warning	IWX	Branch, Saint Joseph	37 min
Jun 20, 8:57 PM EDT	Severe Thunderstorm Warning	IWX	Hillsdale	33 min
Jun 20, 9:38 PM EDT	Severe Thunderstorm Warning	IWX	Branch, Hillsdale	52 min
Jun 20, 9:57 PM EDT	Tornado Warning Tornado observed	IWX	Branch, Hillsdale	33 min
Jun 20, 10:15 PM EDT	Tornado Warning	IWX	Branch, Hillsdale	45 min
Jun 20, 10:57 PM EDT	Special Weather Statement	IWX	Berrien	33 min
Jun 20, 11:37 PM EDT	Special Weather Statement	IWX	Cass	23 min
Jun 20, 11:47 PM EDT	Special Weather Statement	IWX	Cass	28 min
Jun 21, 12:37 AM EDT	Severe Thunderstorm Warning	IWX	Berrien	38 min
Jun 21, 12:47 AM EDT	Severe Thunderstorm Warning	IWX	Berrien, Cass	43 min
Jun 21, 1:26 AM EDT	Tornado Warning	IWX	Berrien, Cass, Saint Joseph	34 min
Jun 21, 1:30 AM EDT	Severe Thunderstorm Warning	IWX	Berrien, Cass	45 min
Jun 21, 2:35 AM EDT	Special Weather Statement	IWX	Branch, Hillsdale	55 min
Jun 21, 2:49 AM EDT	Special Weather Statement	IWX	Branch, Hillsdale	26 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.