Alert archive / Michigan / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 87, NWS Grand Rapids, MI

September 7, 2021Clinton County, Gratiot County, Ionia County, Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at Sep 7, 2021, 3:26 PM EDT for Clinton County, Gratiot County, Ionia County, Michigan. It was in force for 64 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, 3:26 PM EDT (19:26 UTC)
Expired: Sep 7, 2021, 4:30 PM EDT
In force: 64 min
Issued by: NWS Grand Rapids, MI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Clinton County, MI, Gratiot County, MI, Ionia County, MI

What was reported inside it

Time	Report	Where	Remark
Sep 7, 3:36 PM EDT	HAIL 1	2 S Saint Louis, MI	AT INTERSECTION OF STATE RD AND LINCOLN RD.
Sep 7, 3:40 PM EDT	HAIL 0.7	Ionia, MI	PHOTO OF DIME-SIZED HAIL...VIA SOCIAL MEDIA. TIME ESTIMATED FROM RADAR.

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, 12:21 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Sep 7, 3:20 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 7.4 hours before the alert went out and 126 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.

843 
WUUS53 KGRR 071926
SVRGRR
MIC037-057-067-072030-
/O.NEW.KGRR.SV.W.0087.210907T1926Z-210907T2030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Rapids MI
326 PM EDT Tue Sep 7 2021

The National Weather Service in Grand Rapids has issued a

* Severe Thunderstorm Warning for...
  Gratiot County in central Michigan...
  Ionia County in south central Michigan...
  Clinton County in south central Michigan...

* Until 430 PM EDT.

* At 326 PM EDT, a severe thunderstorm was located 6 miles southeast
  of Carson City, or 12 miles southwest of Ithaca, moving east 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...
  Ionia...               Alma...                St. Johns...
  Belding...             Portland...            Ithaca...
  Grand Ledge...         St. Louis...           Lake Odessa...
  Breckenridge...        Saranac...             Elsie...
  DeWitt...              Eureka...              Wheeler...
  Orleans...             Sumner...              Ovid...
  Fowler...              Sebewa...              

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4277 8531 4312 8531 4312 8484 4346 8484
      4347 8437 4277 8436
TIME...MOT...LOC 1926Z 268DEG 30KT 4314 8474 

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

$$

HOVING

3 follow-up statements

200 
WWUS53 KGRR 071940
SVSGRR

Severe Weather Statement
National Weather Service Grand Rapids MI
340 PM EDT Tue Sep 7 2021

MIC037-057-067-072030-
/O.CON.KGRR.SV.W.0087.000000T0000Z-210907T2030Z/
Gratiot MI-Ionia MI-Clinton MI-
340 PM EDT Tue Sep 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR GRATIOT...IONIA AND CLINTON COUNTIES...

At 339 PM EDT, severe thunderstorms were located along a line
extending from 5 miles northwest of Merrill to 6 miles north of
Ionia, moving east at 40 mph.

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

SOURCE...Trained weather spotters. At 336 PM quarter sized hail was 
         reported just east of Alma.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Ionia...               Alma...                St. Johns...
Belding...             Portland...            Ithaca...
Grand Ledge...         St. Louis...           Lake Odessa...
Breckenridge...        Saranac...             Elsie...
DeWitt...              Eureka...              Wheeler...
Orleans...             Sumner...              Ovid...
Fowler...              Sebewa...              

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4277 8531 4312 8531 4312 8484 4336 8484
      4347 8459 4347 8437 4277 8436
TIME...MOT...LOC 1939Z 252DEG 34KT 4348 8438 4307 8510 

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

$$

NJJ

976 
WWUS53 KGRR 072008
SVSGRR

Severe Weather Statement
National Weather Service Grand Rapids MI
408 PM EDT Tue Sep 7 2021

MIC037-067-072017-
/O.CAN.KGRR.SV.W.0087.000000T0000Z-210907T2030Z/
Ionia MI-Clinton MI-
408 PM EDT Tue Sep 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR IONIA AND CLINTON COUNTIES IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 700 PM EDT for
central Michigan.

LAT...LON 4312 8484 4336 8484 4347 8459 4346 8437
      4312 8437
TIME...MOT...LOC 2007Z 259DEG 55KT 4343 8437 4317 8482 

$$

MIC057-072030-
/O.CON.KGRR.SV.W.0087.000000T0000Z-210907T2030Z/
Gratiot MI-
408 PM EDT Tue Sep 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR GRATIOT COUNTY...

At 407 PM EDT, severe thunderstorms were located along a line
extending from near Merrill to near Carson City, moving east at 65
mph.

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

SOURCE...Trained weather spotters.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Alma...                Ithaca...              St. Louis...
Breckenridge...        Wheeler...             Sumner...
North Star...          Ashley...              Perrinton...
Pompeii...             Middleton...           Bannister...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4312 8484 4336 8484 4347 8459 4346 8437
      4312 8437
TIME...MOT...LOC 2007Z 259DEG 55KT 4343 8437 4317 8482 

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

$$

NJJ

865 
WWUS53 KGRR 072030
SVSGRR

Severe Weather Statement
National Weather Service Grand Rapids MI
430 PM EDT Tue Sep 7 2021

MIC057-072039-
/O.EXP.KGRR.SV.W.0087.000000T0000Z-210907T2030Z/
Gratiot MI-
430 PM EDT Tue Sep 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR GRATIOT COUNTY WILL EXPIRE AT
430 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.

A Severe Thunderstorm Watch remains in effect until 700 PM EDT for
central Michigan.

LAT...LON 4312 8484 4336 8484 4347 8459 4346 8437
      4312 8437
TIME...MOT...LOC 2029Z 270DEG 30KT 4344 8412 4318 8457 

$$

NJJ

The office that day

Everything else NWS Grand Rapids, MI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 7, 11:50 AM EDT	Special Marine Warning	GRR		91 min
Sep 7, 12:25 PM EDT	Severe Thunderstorm Warning	GRR	Mason	65 min
Sep 7, 12:32 PM EDT	Severe Thunderstorm Warning	GRR	Lake, Osceola	58 min
Sep 7, 12:40 PM EDT	Special Marine Warning	GRR		87 min
Sep 7, 12:54 PM EDT	Severe Thunderstorm Warning	GRR	Oceana	66 min
Sep 7, 1:08 PM EDT	Tornado Warning	GRR	Clare, Osceola	40 min
Sep 7, 1:13 PM EDT	Severe Thunderstorm Warning	GRR	Lake, Newaygo	37 min
Sep 7, 1:30 PM EDT	Special Marine Warning	GRR		60 min
Sep 7, 1:39 PM EDT	Severe Thunderstorm Warning Destructive damage threat	GRR	Osceola	38 min
Sep 7, 1:51 PM EDT	Severe Thunderstorm Warning	GRR	Muskegon, Oceana	54 min
Sep 7, 2:01 PM EDT	Lakeshore Flood Advisory	GRR	Muskegon	4 hr
Sep 7, 2:03 PM EDT	Severe Thunderstorm Warning	GRR	Clare	46 min
Sep 7, 2:13 PM EDT	Tornado Warning	GRR	Clare	30 min
Sep 7, 2:20 PM EDT	Severe Thunderstorm Warning	GRR	Isabella, Mecosta, Newaygo	55 min
Sep 7, 2:23 PM EDT	Tornado Warning	GRR	Isabella	21 min
Sep 7, 2:40 PM EDT	Severe Thunderstorm Warning	GRR	Kent, Ottawa	39 min
Sep 7, 3:04 PM EDT	Severe Thunderstorm Warning	GRR	Montcalm	56 min
Sep 7, 3:37 PM EDT	Special Marine Warning	GRR		83 min
Sep 7, 4:05 PM EDT	Severe Thunderstorm Warning	GRR	Van Buren	55 min
Sep 7, 4:49 PM EDT	Severe Thunderstorm Warning	GRR	Allegan, Barry, Kalamazoo	42 min
Sep 7, 5:13 PM EDT	Severe Thunderstorm Warning	GRR	Barry, Calhoun, Eaton	47 min
Sep 7, 5:40 PM EDT	Severe Thunderstorm Warning	GRR	Ingham, Jackson	50 min
Sep 7, 6:01 PM EDT	Severe Thunderstorm Warning	GRR	Clinton	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.