Alert archive / Michigan / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 106, NWS Northern Indiana

September 7, 2021Berrien County, Cass County, Saint Joseph County, Michigan

NWS Northern Indiana issued this severe thunderstorm warning at Sep 7, 2021, 4:27 PM EDT for Berrien County, Cass County, Saint Joseph County, Michigan. It was in force for 48 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: Sep 7, 2021, 4:27 PM EDT (20:27 UTC)
Expired: Sep 7, 2021, 5:15 PM EDT
In force: 48 min
Issued by: NWS Northern Indiana
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Berrien County, MI, Cass County, MI, Saint Joseph County, MI

The radar

The Northern Indiana radar (KIWX), 80 km from the middle of the area, began a volume at 20:28 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
Sep 7, 4:40 PM EDT	TSTM WND DMG	4 E Magician Lake, MI	6 TREES DOWNED ACROSS ROADWAY. 2 REPORTS OF POWER LINES DOWNED.

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
Sep 7, 3:20 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 8.5 hours before the alert went out and 225 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1621 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 150 m²/s²
0-3 km storm-relative helicity: 201 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

113 
WUUS53 KIWX 072027
SVRIWX
MIC021-027-149-072115-
/O.NEW.KIWX.SV.W.0106.210907T2027Z-210907T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Northern Indiana
427 PM EDT Tue Sep 7 2021

The National Weather Service in Northern Indiana has issued a

* Severe Thunderstorm Warning for...
  Northern Cass County in southwestern Michigan...
  Northwestern St. Joseph County in southwestern Michigan...
  East central Berrien County in southwestern Michigan...

* Until 515 PM EDT.

* At 426 PM EDT, severe thunderstorms were located along a line
  extending from 6 miles southeast of Watervliet to 6 miles west of
  Dowagiac, moving east at 60 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  Dowagiac around 435 PM EDT.
  Marcellus around 450 PM EDT.
  Three Rivers around 500 PM EDT.

Other locations impacted by these severe thunderstorms include
Magician Lake, Dewey Lake, Moore Park, La Grange, Indian Lake, Sandy
Beach, Fishers Lake, Penn, Corey Lake and Howardsville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

LAT...LON 4207 8622 4207 8551 4191 8556 4194 8632
      4216 8623
TIME...MOT...LOC 2026Z 263DEG 50KT 4211 8619 4201 8624 

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

$$

JBALL

3 follow-up statements

491 
WWUS53 KIWX 072038
SVSIWX

Severe Weather Statement
National Weather Service Northern Indiana
438 PM EDT Tue Sep 7 2021

MIC021-072046-
/O.CAN.KIWX.SV.W.0106.000000T0000Z-210907T2115Z/
Berrien MI-
438 PM EDT Tue Sep 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL BERRIEN COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of
the warned area. Therefore, the warning has been cancelled. 
Additional strong to potentially severe storms over southeastern 
Lake Michigan are being monitored closely as they move east at 50 
mph.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
southwestern Michigan.

LAT...LON 4207 8621 4207 8551 4191 8556 4194 8622
      4201 8621
TIME...MOT...LOC 2036Z 267DEG 43KT 4207 8612 4196 8618 

$$

MIC027-149-072115-
/O.CON.KIWX.SV.W.0106.000000T0000Z-210907T2115Z/
Cass MI-St. Joseph MI-
438 PM EDT Tue Sep 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR NORTHERN CASS AND NORTHWESTERN ST. JOSEPH COUNTIES...

At 436 PM EDT, severe thunderstorms were located along a line
extending from 8 miles west of Decatur to near Dowagiac, moving east
at 50 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

These severe storms will be near...
  Marcellus around 455 PM EDT.
  Three Rivers around 510 PM EDT.

Other locations impacted by these severe thunderstorms include
Magician Lake, Dewey Lake, Moore Park, La Grange, Sandy Beach,
Fishers Lake, Penn, Corey Lake, Howardsville and Flowerfield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

LAT...LON 4207 8621 4207 8551 4191 8556 4194 8622
      4201 8621
TIME...MOT...LOC 2036Z 267DEG 43KT 4207 8612 4196 8618 

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

$$

FISHER

645 
WWUS53 KIWX 072100
SVSIWX

Severe Weather Statement
National Weather Service Northern Indiana
500 PM EDT Tue Sep 7 2021

MIC027-149-072115-
/O.CON.KIWX.SV.W.0106.000000T0000Z-210907T2115Z/
Cass MI-St. Joseph MI-
500 PM EDT Tue Sep 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR NORTHERN CASS AND NORTHWESTERN ST. JOSEPH COUNTIES...

At 500 PM EDT, severe thunderstorms were located along a line
extending from near Marcellus to 8 miles east of Cassopolis, moving
east at 50 mph.

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

SOURCE...Radar indicated.

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

These severe storms will be near...
  Three Rivers around 510 PM EDT.

Other locations impacted by these severe thunderstorms include
Magician Lake, Dewey Lake, Moore Park, La Grange, Sandy Beach,
Fishers Lake, Penn, Corey Lake, Howardsville and Flowerfield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

LAT...LON 4207 8621 4207 8551 4191 8556 4194 8622
      4201 8621
TIME...MOT...LOC 2100Z 268DEG 45KT 4206 8576 4193 8584 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

FISHER

741 
WWUS53 KIWX 072109
SVSIWX

Severe Weather Statement
National Weather Service Northern Indiana
509 PM EDT Tue Sep 7 2021

MIC027-149-072119-
/O.EXP.KIWX.SV.W.0106.000000T0000Z-210907T2115Z/
Cass MI-St. Joseph MI-
509 PM EDT Tue Sep 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN CASS AND NORTHWESTERN
ST. JOSEPH COUNTIES WILL EXPIRE AT 515 PM EDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty 
winds and heavy rain are still possible with these thunderstorms. 
Additional storms are moving across northern Berrien county and will 
be monitored for potential strengthening. 

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
southwestern Michigan.

LAT...LON 4207 8621 4207 8551 4191 8556 4194 8622
      4201 8621
TIME...MOT...LOC 2109Z 263DEG 49KT 4206 8563 4193 8571 

$$

FISHER

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 7, 4:03 PM EDT	Severe Thunderstorm Warning Considerable damage threat	IWX	Berrien	27 min
Sep 7, 4:43 PM EDT	Special Weather Statement	IWX	Van Buren	32 min
Sep 7, 5:15 PM EDT	Special Weather Statement	IWX	Saint Joseph	30 min
Sep 7, 5:24 PM EDT	Severe Thunderstorm Warning	IWX	Branch, Saint Joseph	19 min
Sep 7, 5:26 PM EDT	Areal Flood Advisory	IWX	Berrien	3 hr
Sep 7, 6:51 PM EDT	Special Weather Statement	IWX	Hillsdale	24 min
Sep 7, 7:12 PM EDT	Special Weather Statement	IWX	Branch	33 min
Sep 7, 7:36 PM EDT	Special Weather Statement	IWX	Hillsdale	24 min
Sep 7, 7:46 PM EDT	Severe Thunderstorm Warning	IWX	Hillsdale	29 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.