Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 15, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this severe thunderstorm warning at Jun 21, 2021, 1:33 AM EDT for Calhoun County, Michigan. It was in force for 57 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 21, 2021, 1:33 AM EDT (05:33 UTC)
- Expired
- Jun 21, 2021, 2:30 AM EDT
- In force
- 57 min
- Issued by
- NWS Grand Rapids, MI
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Calhoun County, MI
The radar
The Grand Rapids radar (KGRR), 87 km from the middle of the area, began a volume at 05:37 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 |
|---|---|---|---|
| Jun 21, 1:00 AM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Detroit, MI (KDTX), launched 00:00Z, 5.6 hours before the alert went out and 146 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
- 133 J/kg
- Mixed-layer CIN
- -112 J/kg
- Mixed-layer LCL
- 1501 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 52 m²/s²
- 0-3 km storm-relative helicity
- 102 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
816 WUUS53 KGRR 210533 SVRGRR MIC025-210630- /O.NEW.KGRR.SV.W.0015.210621T0533Z-210621T0630Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Grand Rapids MI 133 AM EDT Mon Jun 21 2021 The National Weather Service in Grand Rapids has issued a * Severe Thunderstorm Warning for... Calhoun County in south central Michigan... * Until 230 AM EDT. * At 133 AM EDT, a severe thunderstorm was located near Union City, or 15 miles south of Battle Creek, moving east at 30 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Albion... Marshall... Battle Creek... Homer... Union City... Burlington... Marengo... Athens... Tekonsha... Pine Creek... Ceresco... PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4225 8529 4235 8472 4207 8471 4207 8528 TIME...MOT...LOC 0533Z 253DEG 24KT 4210 8522 TORNADO...POSSIBLE HAIL...<.75IN WIND...60MPH $$ HOVING
2 follow-up statements
838 WWUS53 KGRR 210544 SVSGRR Severe Weather Statement National Weather Service Grand Rapids MI 144 AM EDT Mon Jun 21 2021 MIC025-210630- /O.CON.KGRR.SV.W.0015.000000T0000Z-210621T0630Z/ Calhoun MI- 144 AM EDT Mon Jun 21 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 AM EDT FOR CALHOUN COUNTY... At 144 AM EDT, a severe thunderstorm was located near Burlington, or 12 miles southwest of Marshall, moving east at 30 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Albion... Marshall... Battle Creek... Homer... Union City... Burlington... Marengo... Athens... Tekonsha... Pine Creek... Ceresco... PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4225 8529 4235 8472 4207 8471 4207 8528 TIME...MOT...LOC 0544Z 253DEG 24KT 4212 8512 HAIL...<.75IN WIND...60MPH $$ 04
057
WWUS53 KGRR 210627
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
227 AM EDT Mon Jun 21 2021
MIC025-210637-
/O.EXP.KGRR.SV.W.0015.000000T0000Z-210621T0630Z/
Calhoun MI-
227 AM EDT Mon Jun 21 2021
...THE SEVERE THUNDERSTORM WARNING FOR CALHOUN COUNTY WILL EXPIRE AT
230 AM EDT...
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 will be allowed to expire.
A Severe Thunderstorm Watch remains in effect until 600 AM EDT for
south central Michigan.
LAT...LON 4225 8529 4235 8472 4207 8471 4207 8528
TIME...MOT...LOC 0627Z 253DEG 24KT 4220 8475
$$
04The office that day
Everything else NWS Grand Rapids, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 8:42 PM EDT | Severe Thunderstorm Warning | GRR | Calhoun, Eaton, Ingham, Jackson | 63 min |
| Jun 20, 10:39 PM EDT | Areal Flood Advisory | GRR | Allegan, Calhoun, Jackson, Kalamazoo, Van Buren | 6 hr |
| Jun 21, 12:38 AM EDT | Severe Thunderstorm Warning | GRR | Van Buren | 67 min |
| Jun 21, 12:45 AM EDT | Special Marine Warning | GRR | 31 min | |
| Jun 21, 1:12 AM EDT | Tornado Warning | GRR | Van Buren | 36 min |
| Jun 21, 1:30 AM EDT | Severe Thunderstorm Warning | GRR | Kalamazoo | 60 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.