Alert archive / Michigan / Severe Thunderstorm Watches in 2021
Severe Thunderstorm Watch 298
The Storm Prediction Center issued this severe thunderstorm watch at Jun 21, 2021, 1:00 AM EDT for 14 counties in Indiana; 20 counties in Michigan; 17 counties in Ohio. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 21, 2021, 1:00 AM EDT (05:00 UTC)
- Expired
- Jun 21, 2021, 8:00 AM EDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 51 counties
Allen County, IN, DeKalb County, IN, Elkhart County, IN, Fulton County, IN, Kosciusko County, IN, LaGrange County, IN, LaPorte County, IN, Marshall County, IN, Noble County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, Whitley County, IN, Allegan County, MI, Barry County, MI, Berrien County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Eaton County, MI, Hillsdale County, MI, Ingham County, MI, Jackson County, MI, Kalamazoo County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Monroe County, MI, Oakland County, MI, Saint Joseph County, MI, Van Buren County, MI, Washtenaw County, MI, Wayne County, MI, Ashtabula County, OH, Cuyahoga County, OH, Defiance County, OH, Erie County, OH, Fulton County, OH, Geauga County, OH, Henry County, OH, Huron County, OH, Lake County, OH, Lorain County, OH, Lucas County, OH, Medina County, OH, Ottawa County, OH, Paulding County, OH, Sandusky County, OH, Williams County, OH, Wood County, OH
The radar
The Northern Indiana radar (KIWX), 78 km from the middle of the area, began a volume at 05:00 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 20%
- One or more EF2 to EF5 tornadoes
- 10%
- Ten or more severe wind reports
- 60%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
18 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 1:12 AM EDT | Tornado Warning | GRR | Van Buren | 36 min |
| Jun 21, 1:21 AM EDT | Tornado Warning | IWX | LaPorte | 24 min |
| Jun 21, 1:26 AM EDT | Tornado Warning | IWX | Berrien, Cass, Saint Joseph | 34 min |
| Jun 21, 1:30 AM EDT | Severe Thunderstorm Warning | IWX | Elkhart, Fulton, LaPorte, Marshall, Pulaski, Saint Joseph and 1 more | 45 min |
| Jun 21, 1:30 AM EDT | Severe Thunderstorm Warning | GRR | Kalamazoo | 60 min |
| Jun 21, 1:31 AM EDT | Tornado Warning | IWX | LaPorte, Starke | 29 min |
| Jun 21, 1:33 AM EDT | Severe Thunderstorm Warning | GRR | Calhoun | 57 min |
| Jun 21, 1:58 AM EDT | Severe Thunderstorm Warning | IWX | Branch, Cass, Saint Joseph | 34 min |
| Jun 21, 2:26 AM EDT | Severe Thunderstorm Warning | IWX | Elkhart, Kosciusko, LaGrange, Noble | 21 min |
| Jun 21, 3:35 AM EDT | Severe Thunderstorm Warning | DTX | Lenawee | 40 min |
| Jun 21, 3:39 AM EDT | Severe Thunderstorm Warning | IWX | Defiance, Fulton, Henry, Williams | 38 min |
| Jun 21, 3:52 AM EDT | Severe Thunderstorm Warning | CLE | Lucas, Ottawa, Sandusky, Wood | 68 min |
| Jun 21, 3:54 AM EDT | Severe Thunderstorm Warning | DTX | Monroe | 51 min |
| Jun 21, 5:17 AM EDT | Severe Thunderstorm Warning | CLE | Erie, Huron, Sandusky, Seneca | 43 min |
| Jun 21, 5:38 AM EDT | Severe Thunderstorm Warning | CLE | Cuyahoga, Lorain | 67 min |
| Jun 21, 6:26 AM EDT | Severe Thunderstorm Warning | CLE | Geauga, Lake | 49 min |
| Jun 21, 6:43 AM EDT | Severe Thunderstorm Warning | CLE | Geauga, Portage, Summit | 47 min |
| Jun 21, 6:51 AM EDT | Severe Thunderstorm Warning | CLE | Ashtabula, Trumbull | 54 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Detroit, MI (KDTX), launched 00:00Z, 5.0 hours before the alert went out and 178 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.
371 WWUS20 KWNS 210458 SEL8 SPC WW 210458 INZ000-MIZ000-OHZ000-LEZ000-LMZ000-211000- URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 298 NWS Storm Prediction Center Norman OK 100 AM EDT Mon Jun 21 2021 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Northern Indiana Southern Lower Michigan Northwest Ohio Lake Erie Lake Michigan * Effective this Monday morning from 100 AM until 600 AM EDT. * Primary threats include... Scattered damaging wind gusts to 70 mph likely Isolated large hail events to 1 inch in diameter possible A tornado or two possible SUMMARY...A secondary round of severe storms are expected to steadily develop west-to-east across the region overnight, particularly across far northern Indiana and southern Lower Michigan into northwest Ohio. Damaging winds are the primary concern, although a tornado or two could occur with any line-embedded circulations. The severe thunderstorm watch area is approximately along and 65 statute miles north and south of a line from 30 miles west of South Bend IN to 20 miles southeast of Detroit MI. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU8). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Severe Thunderstorm Watch means conditions are favorable for severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. Severe thunderstorms can and occasionally do produce tornadoes. && OTHER WATCH INFORMATION...CONTINUE...WW 295...WW 296...WW 297... AVIATION...A few severe thunderstorms with hail surface and aloft to 1 inch. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 550. Mean storm motion vector 27035. ...Guyer
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 8:14 PM EDT | Mesoscale Discussion | SPC | Adams, Allen, Blackford, Boone, Carroll, Cass and 30 more | 61 min |
| Jun 20, 10:40 PM EDT | Severe Thunderstorm Watch | SPC | Benton, Jasper, Lake, Newton, Porter | 4 hr |
| Jun 20, 11:51 PM EDT | Mesoscale Discussion | SPC | Adams, Allen, Cass, DeKalb, Elkhart, Fulton and 14 more | 54 min |
| Jun 21, 2:14 AM EDT | Mesoscale Discussion | SPC | Allen, DeKalb, Elkhart, Fulton, Kosciusko, LaGrange and 8 more | 2 hr |
| Jun 21, 11:59 AM EDT | Mesoscale Discussion | SPC | Ashland, Ashtabula, Athens, Belmont, Carroll, Columbiana and 31 more | 91 min |
| Jun 21, 12:31 PM EDT | Severe Thunderstorm Watch | SPC | Adams, Ashtabula, Athens, Belmont, Carroll, Columbiana and 33 more | 7 hr |
Nearby
Severe Thunderstorm Watches in Michigan, 2021Severe Thunderstorm Watches in Ohio, 2021Severe Thunderstorm Watches in Indiana, 2021Every severe thunderstorm watch 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.