Alert archive / Michigan / Tornado Warnings in 2021

Tornado Warning 14, NWS Grand Rapids, MI

September 7, 2021Isabella County, Michigan

NWS Grand Rapids, MI issued this tornado warning at Sep 7, 2021, 2:23 PM EDT for Isabella County, Michigan. It was in force for 21 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 7, 2021, 2:23 PM EDT (18:23 UTC)
Expired: Sep 7, 2021, 2:44 PM EDT
In force: 21 min
Issued by: NWS Grand Rapids, MI
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

County Isabella County, MI

The radar

The Grand Rapids radar (KGRR), 112 km from the middle of the area, began a volume at 18:26 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.

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

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 6.4 hours before the alert went out and 159 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.

198 
WFUS53 KGRR 071823
TORGRR
MIC073-071900-
/O.NEW.KGRR.TO.W.0014.210907T1823Z-210907T1900Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Grand Rapids MI
223 PM EDT Tue Sep 7 2021

The National Weather Service in Grand Rapids has issued a

* Tornado Warning for...
  Northeastern Isabella County in central Michigan...

* Until 300 PM EDT.
    
* At 223 PM EDT, a severe thunderstorm capable of producing a tornado
  was located near Clare, moving east at 60 mph.

  HAZARD...Tornado and quarter size hail.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This tornadic thunderstorm will remain over mainly rural areas of
  northeastern Isabella County, including the following locations...
  Delwin, Loomis, Beal City and Weidman.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4367 8497 4382 8497 4382 8484 4381 8461
      4377 8460 4366 8461
TIME...MOT...LOC 1823Z 267DEG 54KT 4376 8481 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN

$$

HOVING

1 follow-up statement

779 
WWUS53 KGRR 071844
SVSGRR

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

MIC073-071854-
/O.CAN.KGRR.TO.W.0014.000000T0000Z-210907T1900Z/
Isabella MI-
244 PM EDT Tue Sep 7 2021

...THE TORNADO WARNING FOR NORTHEASTERN ISABELLA COUNTY IS
CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.  However, gusty winds are
still possible with this thunderstorm.

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

Remember, a Severe Thunderstorm Warning still remains in effect for
Isabella County until 315 PM edt.

LAT...LON 4367 8497 4382 8497 4382 8484 4381 8461
      4377 8460 4366 8461
TIME...MOT...LOC 1841Z 267DEG 54KT 4378 8437 

$$

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, 2:40 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, 3:26 PM EDT	Severe Thunderstorm Warning	GRR	Clinton, Gratiot, Ionia	64 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

Tornado Warnings in Michigan, 2021 Every tornado warning in 2021 Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.