Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 72, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this severe thunderstorm warning at Aug 28, 2021, 7:33 PM EDT for Gratiot County, Michigan. It was in force for 42 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, 7:33 PM EDT (23:33 UTC)
- Expired
- Aug 28, 2021, 8:15 PM EDT
- In force
- 42 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), 97 km from the middle of the area, began a volume at 23:35 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, 11.6 hours before the alert went out and 99 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.
459
WUUS53 KGRR 282333
SVRGRR
MIC057-290015-
/O.NEW.KGRR.SV.W.0072.210828T2333Z-210829T0015Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Rapids MI
733 PM EDT Sat Aug 28 2021
The National Weather Service in Grand Rapids has issued a
* Severe Thunderstorm Warning for...
Southeastern Gratiot County in central Michigan...
* Until 815 PM EDT.
* At 732 PM EDT, severe thunderstorms were located along a line
extending from 5 miles south of Breckenridge to 6 miles northwest
of Elsie, moving northeast 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...
Ashley... Bannister...
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 4312 8450 4325 8452 4332 8454 4334 8451
4335 8437 4321 8437 4321 8436 4320 8436
4312 8437
TIME...MOT...LOC 2332Z 222DEG 30KT 4333 8445 4318 8445
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
JC1 follow-up statement
482
WWUS53 KGRR 290007
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
807 PM EDT Sat Aug 28 2021
MIC057-290015-
/O.CON.KGRR.SV.W.0072.000000T0000Z-210829T0015Z/
Gratiot MI-
807 PM EDT Sat Aug 28 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM EDT
FOR SOUTHEASTERN GRATIOT COUNTY...
At 807 PM EDT, severe thunderstorms were located along a line
extending from 5 miles west of Freeland to 5 miles northwest of St.
Charles, moving northeast at 35 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Ashley... Bannister...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4324 8452 4332 8437 4321 8437 4321 8436
4320 8436 4312 8437 4312 8450
TIME...MOT...LOC 0007Z 222DEG 30KT 4352 8421 4337 8422
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
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, 6:43 PM EDT | Severe Thunderstorm Warning | GRR | Gratiot | 47 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.