Alert archive / Michigan / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 108, NWS Northern Indiana

September 7, 2021Hillsdale County, Michigan

NWS Northern Indiana issued this severe thunderstorm warning at Sep 7, 2021, 7:46 PM EDT for Hillsdale County, Michigan. It was in force for 29 min. 2 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: Sep 7, 2021, 7:46 PM EDT (23:46 UTC)
Expired: Sep 7, 2021, 8:15 PM EDT
In force: 29 min
Issued by: NWS Northern Indiana
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Hillsdale County, MI

The radar

The Detroit radar (KDTX), 118 km from the middle of the area, began a volume at 23:49 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, 7:46 PM EDT	TSTM WND DMG	Allen, MI	TREES AND POWER POLES/LINES DOWNED.
Sep 7, 7:47 PM EDT	TSTM WND DMG	Hillsdale, MI	TREES DOWNED, SOME ONTO BUILDINGS. POWER LINES AND POLES 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, 11.8 hours before the alert went out and 122 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.

083 
WUUS53 KIWX 072346
SVRIWX
MIC059-080015-
/O.NEW.KIWX.SV.W.0108.210907T2346Z-210908T0015Z/

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

The National Weather Service in Northern Indiana has issued a

* Severe Thunderstorm Warning for...
  Northern Hillsdale County in southeastern Michigan...

* Until 815 PM EDT.

* At 746 PM EDT, a severe thunderstorm was located over Jonesville,
  moving east at 50 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...
  Hillsdale, Jonesville, Litchfield, Jerome, Somerset, Moscow, North
  Adams, Allen and Somerset Center.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4189 8437 4193 8478 4206 8478 4207 8449
      4207 8437
TIME...MOT...LOC 2346Z 271DEG 43KT 4197 8467 

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

$$

FISHER

1 follow-up statement

643 
WWUS53 KIWX 080007
SVSIWX

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

MIC059-080017-
/O.EXP.KIWX.SV.W.0108.000000T0000Z-210908T0015Z/
Hillsdale MI-
807 PM EDT Tue Sep 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN HILLSDALE COUNTY WILL
EXPIRE AT 815 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 1100 PM EDT for
southeastern Michigan.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Northern Indiana.

LAT...LON 4189 8437 4193 8478 4206 8478 4207 8449
      4207 8437
TIME...MOT...LOC 0007Z 271DEG 43KT 4197 8435 

$$

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, 4:27 PM EDT	Severe Thunderstorm Warning	IWX	Berrien, Cass, Saint Joseph	48 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

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.