Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 71, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this severe thunderstorm warning at Aug 28, 2021, 6:43 PM EDT for Gratiot County, Michigan. It was in force for 47 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
- Aug 28, 2021, 6:43 PM EDT (22:43 UTC)
- Expired
- Aug 28, 2021, 7:30 PM EDT
- In force
- 47 min
- Issued by
- NWS Grand Rapids, MI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Gratiot County, MI
The radar
The Grand Rapids radar (KGRR), 94 km from the middle of the area, began a volume at 22:47 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, 10.7 hours before the alert went out and 114 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
- 1891 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 860 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 65 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 1.8
The text
As transmitted.
575
WUUS53 KGRR 282243
SVRGRR
MIC057-282330-
/O.NEW.KGRR.SV.W.0071.210828T2243Z-210828T2330Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Rapids MI
643 PM EDT Sat Aug 28 2021
The National Weather Service in Grand Rapids has issued a
* Severe Thunderstorm Warning for...
Northeastern Gratiot County in central Michigan...
* Until 730 PM EDT.
* At 642 PM EDT, severe thunderstorms were located along a line
extending from near Alma to near Ithaca, moving northeast at 15
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...
Breckenridge... Wheeler... North Star...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4322 8460 4336 8474 4347 8464 4347 8437
4326 8437
TIME...MOT...LOC 2242Z 242DEG 14KT 4334 8466 4324 8455
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
JC2 follow-up statements
890
WWUS53 KGRR 282258
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
658 PM EDT Sat Aug 28 2021
MIC057-282330-
/O.CON.KGRR.SV.W.0071.000000T0000Z-210828T2330Z/
Gratiot MI-
658 PM EDT Sat Aug 28 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR NORTHEASTERN GRATIOT COUNTY...
At 658 PM EDT, severe thunderstorms were located along a line
extending from near Alma to 6 miles east of Ithaca, moving northeast
at 15 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
These severe storms will be near...
Breckenridge around 720 PM EDT.
Other locations impacted by these severe thunderstorms include
Wheeler and North Star.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4330 8468 4335 8467 4347 8448 4347 8437
4326 8437 4322 8460
TIME...MOT...LOC 2258Z 242DEG 14KT 4336 8460 4326 8449
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
JC469
WWUS53 KGRR 282317
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
717 PM EDT Sat Aug 28 2021
MIC057-282330-
/O.CON.KGRR.SV.W.0071.000000T0000Z-210828T2330Z/
Gratiot MI-
717 PM EDT Sat Aug 28 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR EAST CENTRAL GRATIOT COUNTY...
At 717 PM EDT, severe thunderstorms were located along a line
extending from 5 miles east of Ithaca to near Marion Springs, moving
east at 20 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.
These severe thunderstorms will remain over mainly rural areas of
east central Gratiot County, including the following locations...
North Star.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4326 8464 4331 8461 4334 8457 4344 8437
4326 8437 4322 8460
TIME...MOT...LOC 2317Z 266DEG 19KT 4331 8449 4330 8434
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
JCThe office that day
Everything else NWS Grand Rapids, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 8:12 PM EDT | Severe Thunderstorm Warning | GRR | Mecosta, Newaygo | 48 min |
| Aug 28, 1:06 AM EDT | Special Marine Warning | GRR | 84 min | |
| Aug 28, 2:09 AM EDT | Special Weather Statement | GRR | Lake, Mason | 66 min |
| Aug 28, 2:42 AM EDT | Areal Flood Advisory | GRR | Mason | 6 hr |
| Aug 28, 2:50 AM EDT | Severe Thunderstorm Warning | GRR | Lake, Osceola | 55 min |
| Aug 28, 3:35 AM EDT | Severe Thunderstorm Warning | GRR | Clare | 55 min |
| Aug 28, 10:32 AM EDT | Small Craft Advisory | GRR | 35 hr | |
| Aug 28, 10:40 AM EDT | Beach Hazards Statement | GRR | Allegan, Mason, Muskegon, Oceana, Ottawa, Van Buren | 35 hr |
| Aug 28, 3:54 PM EDT | Special Weather Statement | GRR | Clare | 66 min |
| Aug 28, 4:07 PM EDT | Special Weather Statement | GRR | Montcalm | 68 min |
| Aug 28, 5:43 PM EDT | Special Weather Statement | GRR | Gratiot | 62 min |
| Aug 28, 5:57 PM EDT | Severe Thunderstorm Warning | GRR | Gratiot | 48 min |
| Aug 28, 7:33 PM EDT | Severe Thunderstorm Warning | GRR | Gratiot | 42 min |
| Aug 28, 7:48 PM EDT | Special Weather Statement | GRR | Clinton, Ionia | 57 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.