Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 3, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this severe thunderstorm warning at Jun 12, 2021, 4:36 PM EDT for Gratiot County, Isabella County, Michigan. It was in force for 39 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
- Jun 12, 2021, 4:36 PM EDT (20:36 UTC)
- Expired
- Jun 12, 2021, 5:15 PM EDT
- In force
- 39 min
- Issued by
- NWS Grand Rapids, MI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Gratiot County, MI, Isabella County, MI
The radar
The Grand Rapids radar (KGRR), 93 km from the middle of the area, began a volume at 20:36 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 nearest sounding before it
Detroit, MI (KDTX), launched 12:00Z, 8.6 hours before the alert went out and 128 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.
- Mixed-layer CAPE
- 5 J/kg
- Mixed-layer CIN
- -240 J/kg
- Mixed-layer LCL
- 714 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- 89 m²/s²
- 0-3 km storm-relative helicity
- 118 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
285
WUUS53 KGRR 122036
SVRGRR
MIC057-073-122115-
/O.NEW.KGRR.SV.W.0003.210612T2036Z-210612T2115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Rapids MI
436 PM EDT Sat Jun 12 2021
The National Weather Service in Grand Rapids has issued a
* Severe Thunderstorm Warning for...
Northeastern Gratiot County in central Michigan...
Southeastern Isabella County in central Michigan...
* Until 515 PM EDT.
* At 435 PM EDT, a severe thunderstorm was located 7 miles southwest
of Shepherd, or 8 miles south of Mount Pleasant, moving southeast
at 40 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...
Alma... Ithaca... St. Louis...
Shepherd... Breckenridge... Wheeler...
North Star... Ashley... Forest Hill...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.
&&
LAT...LON 4344 8485 4346 8484 4347 8486 4358 8485
4349 8460 4347 8460 4347 8454 4340 8437
4312 8437
TIME...MOT...LOC 2035Z 301DEG 34KT 4347 8482
HAIL...1.00IN
WIND...60MPH
$$
WDM2 follow-up statements
293
WWUS53 KGRR 122105
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
505 PM EDT Sat Jun 12 2021
MIC057-073-122115-
/O.CON.KGRR.SV.W.0003.000000T0000Z-210612T2115Z/
Gratiot MI-Isabella MI-
505 PM EDT Sat Jun 12 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT
FOR NORTHEASTERN GRATIOT AND SOUTHEASTERN ISABELLA COUNTIES...
At 505 PM EDT, a severe thunderstorm was located 6 miles south of
Breckenridge, or 6 miles east of Ithaca, moving southeast at 40 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Alma... Ithaca... St. Louis...
Shepherd... Breckenridge... Wheeler...
North Star... Ashley... Forest Hill...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.
&&
LAT...LON 4344 8485 4346 8484 4347 8486 4358 8485
4349 8460 4347 8460 4347 8454 4340 8437
4312 8437
TIME...MOT...LOC 2105Z 301DEG 34KT 4332 8448
HAIL...1.00IN
WIND...60MPH
$$
WDM953
WWUS53 KGRR 122118
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
518 PM EDT Sat Jun 12 2021
MIC057-073-122128-
/O.EXP.KGRR.SV.W.0003.000000T0000Z-210612T2115Z/
Gratiot MI-Isabella MI-
518 PM EDT Sat Jun 12 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN GRATIOT AND
SOUTHEASTERN ISABELLA COUNTIES HAS EXPIRED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been allowed to expire.
LAT...LON 4344 8485 4346 8484 4347 8486 4358 8485
4349 8460 4347 8460 4347 8454 4340 8437
4312 8437
TIME...MOT...LOC 2118Z 301DEG 34KT 4326 8435
$$
WDMThe office that day
Everything else NWS Grand Rapids, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 12, 3:54 PM EDT | Special Weather Statement | GRR | Clare, Isabella, Mecosta | 66 min |
| Jun 12, 5:44 PM EDT | Severe Thunderstorm Warning | GRR | Clinton, Gratiot, Montcalm | 46 min |
| Jun 12, 6:37 PM EDT | Severe Thunderstorm Warning | GRR | Clinton, Ingham | 38 min |
| Jun 12, 6:45 PM EDT | Severe Thunderstorm Warning | GRR | Clare, Osceola | 30 min |
| Jun 12, 7:43 PM EDT | Severe Thunderstorm Warning | GRR | Gratiot, Isabella, Mecosta, Montcalm | 47 min |
Nearby
Severe Thunderstorm Warnings in Michigan, 2021Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.