Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 73, NWS Northern Indiana
NWS Northern Indiana issued this severe thunderstorm warning at Aug 10, 2021, 1:18 AM EDT for Cass County, Michigan. It was in force for 27 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 10, 2021, 1:18 AM EDT (05:18 UTC)
- Expired
- Aug 10, 2021, 1:45 AM EDT
- In force
- 27 min
- Issued by
- NWS Northern Indiana
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Cass County, MI
The radar
The Northern Indiana radar (KIWX), 71 km from the middle of the area, began a volume at 05:17 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 00:00Z, 5.3 hours before the alert went out and 228 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
- 532 J/kg
- Mixed-layer CIN
- -29 J/kg
- Mixed-layer LCL
- 924 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 49 m²/s²
- 0-3 km storm-relative helicity
- 75 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
116 WUUS53 KIWX 100518 SVRIWX MIC027-100545- /O.NEW.KIWX.SV.W.0073.210810T0518Z-210810T0545Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Northern Indiana 118 AM EDT Tue Aug 10 2021 The National Weather Service in Northern Indiana has issued a * Severe Thunderstorm Warning for... Central Cass County in southwestern Michigan... * Until 145 AM EDT. * At 118 AM EDT, a severe thunderstorm was located near Dowagiac, moving east at 35 mph. HAZARD...60 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Dowagiac, Cassopolis, Pokagon, Penn, Vandalia, Dailey, La Grange, Paradise Lake, Calvin Center, Sumnerville, Indian Lake, Donnell Lake, Diamond Lake, Shavehead Lake and Wakelee. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4203 8587 4182 8586 4189 8622 4200 8622 TIME...MOT...LOC 0518Z 272DEG 31KT 4194 8618 TORNADO...POSSIBLE HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...0.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Brown
2 follow-up statements
645 WWUS53 KIWX 100533 SVSIWX Severe Weather Statement National Weather Service Northern Indiana 133 AM EDT Tue Aug 10 2021 MIC027-100545- /O.CON.KIWX.SV.W.0073.000000T0000Z-210810T0545Z/ Cass MI- 133 AM EDT Tue Aug 10 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 145 AM EDT FOR CENTRAL CASS COUNTY... At 133 AM EDT, a severe thunderstorm was located over Cassopolis, or near Dowagiac, moving east at 35 mph. HAZARD...60 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Cassopolis, Penn, Vandalia, Diamond Lake, Shavehead Lake, La Grange, Paradise Lake, Calvin Center, Donnell Lake and Wakelee. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4203 8587 4182 8586 4186 8609 4201 8607 TIME...MOT...LOC 0533Z 272DEG 31KT 4194 8600 TORNADO...POSSIBLE HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...0.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ Brown
555
WWUS53 KIWX 100538
SVSIWX
Severe Weather Statement
National Weather Service Northern Indiana
138 AM EDT Tue Aug 10 2021
MIC027-100548-
/O.EXP.KIWX.SV.W.0073.000000T0000Z-210810T0545Z/
Cass MI-
138 AM EDT Tue Aug 10 2021
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL CASS COUNTY WILL
EXPIRE AT 145 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. However heavy rain
is still possible with this thunderstorm.
LAT...LON 4203 8587 4182 8586 4186 8609 4201 8607
TIME...MOT...LOC 0538Z 272DEG 31KT 4194 8595
$$
BrownThe office that day
Everything else NWS Northern Indiana issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 12:22 AM EDT | Areal Flood Advisory | IWX | Berrien | 3 hr |
| Aug 10, 12:54 AM EDT | Special Weather Statement | IWX | Berrien | 36 min |
| Aug 10, 1:09 AM EDT | Flash Flood Warning | IWX | Berrien | 3 hr |
| Aug 10, 1:13 AM EDT | Special Weather Statement | IWX | Cass | 32 min |
| Aug 10, 2:43 AM EDT | Areal Flood Advisory | IWX | Berrien, Cass, Saint Joseph | 3 hr |
| Aug 10, 6:31 AM EDT | Areal Flood Warning | IWX | Berrien | 7 hr |
| Aug 10, 3:27 PM EDT | Heat Advisory | IWX | Branch, Cass, Hillsdale, Saint Joseph | 29 hr |
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.