Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 98, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this severe thunderstorm warning at Oct 11, 2021, 4:49 PM EDT for Osceola County, Michigan. It was in force for 26 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
- Oct 11, 2021, 4:49 PM EDT (20:49 UTC)
- Expired
- Oct 11, 2021, 5:15 PM EDT
- In force
- 26 min
- Issued by
- NWS Grand Rapids, MI
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Osceola County, MI
The radar
The NCL Michigan radar (KAPX), 104 km from the middle of the area, began a volume at 20:50 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, 8.8 hours before the alert went out and 215 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
- 165 J/kg
- Mixed-layer CIN
- -185 J/kg
- Mixed-layer LCL
- 957 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 112 m²/s²
- 0-3 km storm-relative helicity
- 186 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
555
WUUS53 KGRR 112049
SVRGRR
MIC133-112115-
/O.NEW.KGRR.SV.W.0098.211011T2049Z-211011T2115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Rapids MI
449 PM EDT Mon Oct 11 2021
The National Weather Service in Grand Rapids has issued a
* Severe Thunderstorm Warning for...
Northern Osceola County in central Michigan...
* Until 515 PM EDT.
* At 448 PM EDT, a severe thunderstorm was located 11 miles northwest
of Evart, moving northeast at 40 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Highland... Le Roy... Tustin...
Dighton...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4416 8513 4402 8525 4395 8543 4400 8556
4417 8546
TIME...MOT...LOC 2048Z 207DEG 34KT 4403 8540
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
CAS2 follow-up statements
449 WWUS53 KGRR 112105 SVSGRR Severe Weather Statement National Weather Service Grand Rapids MI 505 PM EDT Mon Oct 11 2021 MIC133-112115- /O.CON.KGRR.SV.W.0098.000000T0000Z-211011T2115Z/ Osceola MI- 505 PM EDT Mon Oct 11 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT FOR NORTH CENTRAL OSCEOLA COUNTY... At 505 PM EDT, a severe thunderstorm was located 10 miles south of Cadillac, or 5 miles east of Tustin, moving northeast at 20 mph. HAZARD...60 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Highland... Dighton... PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain alert for a possible tornado! Tornadoes can develop quickly from severe thunderstorms. If you spot a tornado go at once into the basement or small central room in a sturdy structure. For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4407 8529 4408 8544 4417 8544 4416 8518 TIME...MOT...LOC 2104Z 203DEG 19KT 4409 8536 TORNADO...POSSIBLE HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...0.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ CAS
836
WWUS53 KGRR 112115
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
515 PM EDT Mon Oct 11 2021
MIC133-112125-
/O.EXP.KGRR.SV.W.0098.000000T0000Z-211011T2115Z/
Osceola MI-
515 PM EDT Mon Oct 11 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL OSCEOLA COUNTY
HAS EXPIRED...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been allowed to expire.
LAT...LON 4407 8529 4408 8544 4417 8544 4416 8518
TIME...MOT...LOC 2115Z 207DEG 34KT 4417 8530
$$
CASThe office that day
Everything else NWS Grand Rapids, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 11, 7:02 PM EDT | Special Weather Statement | GRR | Van Buren | 58 min |
| Oct 11, 7:11 PM EDT | Special Marine Warning | GRR | 64 min | |
| Oct 11, 7:27 PM EDT | Severe Thunderstorm Warning | GRR | Van Buren | 32 min |
| Oct 11, 7:30 PM EDT | Special Marine Warning | GRR | 48 min | |
| Oct 11, 7:36 PM EDT | Special Weather Statement | GRR | Allegan | 39 min |
| Oct 11, 7:41 PM EDT | Special Marine Warning | GRR | 64 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.