Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 99, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this severe thunderstorm warning at Oct 11, 2021, 7:27 PM EDT for Van Buren County, Michigan. It was in force for 32 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Oct 11, 2021, 7:27 PM EDT (23:27 UTC)
- Expired
- Oct 11, 2021, 7:59 PM EDT
- In force
- 32 min
- Issued by
- NWS Grand Rapids, MI
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Van Buren County, MI
The radar
The Grand Rapids radar (KGRR), 88 km from the middle of the area, began a volume at 23:32 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 was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Oct 11, 7:36 PM EDT | TSTM WND DMG | Bangor, MI | MULTIPLE TREES AND POWER LINES DOWN. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Detroit, MI (KDTX), launched 12:00Z, 11.5 hours before the alert went out and 229 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.
526
WUUS53 KGRR 112327
SVRGRR
MIC159-120015-
/O.NEW.KGRR.SV.W.0099.211011T2327Z-211012T0015Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Rapids MI
727 PM EDT Mon Oct 11 2021
The National Weather Service in Grand Rapids has issued a
* Severe Thunderstorm Warning for...
Van Buren County in southwestern Michigan...
* Until 815 PM EDT.
* At 725 PM EDT, severe thunderstorms were located along a line
extending from Benton Harbor to Cassopolis, moving north at 50 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
South Haven... Paw Paw... Hartford...
Mattawan... Lawton... Bangor...
Decatur... Van Buren SP... Lake Michigan
Beach...
Pine Grove... Covert... Keeler...
Lawrence... Gobles... Bloomingdale...
Breedsville... Glendale... Grand Junction...
Kendall... Lacota...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
These storms have a history of knocking down trees in Indiana and in
Berrien County. For your protection move to an interior room on the
lowest floor of a building.
&&
LAT...LON 4207 8622 4224 8622 4224 8637 4235 8630
4241 8628 4242 8577 4207 8576
TIME...MOT...LOC 2325Z 202DEG 43KT 4215 8639 4196 8598
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
CAS3 follow-up statements
555
WWUS53 KGRR 112342
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
742 PM EDT Mon Oct 11 2021
MIC159-120015-
/O.CON.KGRR.SV.W.0099.000000T0000Z-211012T0015Z/
Van Buren MI-
742 PM EDT Mon Oct 11 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM EDT
FOR VAN BUREN COUNTY...
At 741 PM EDT, severe thunderstorms were located along a line
extending from near South Haven to near Lawton, moving northeast at
55 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
South Haven... Paw Paw... Mattawan...
Lawton... Bangor... Van Buren SP...
Pine Grove... Covert... Lawrence...
Gobles... Bloomingdale... Breedsville...
Glendale... Grand Junction... Kendall...
Lacota...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4214 8576 4208 8581 4232 8632 4235 8630
4241 8628 4242 8577
TIME...MOT...LOC 2341Z 202DEG 47KT 4237 8628 4218 8587
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
CAS422 WWUS53 KGRR 112350 SVSGRR Severe Weather Statement National Weather Service Grand Rapids MI 750 PM EDT Mon Oct 11 2021 MIC159-120015- /O.CON.KGRR.SV.W.0099.000000T0000Z-211012T0015Z/ Van Buren MI- 750 PM EDT Mon Oct 11 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM EDT FOR NORTHEASTERN VAN BUREN COUNTY... At 750 PM EDT, severe thunderstorms were located along a line extending from 7 miles north of Bangor to near Mattawan, moving northeast at 55 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Pine Grove... Gobles... Bloomingdale... Kendall... Grand Junction... PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4225 8576 4241 8617 4242 8577 TIME...MOT...LOC 2350Z 226DEG 48KT 4242 8612 4228 8582 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ CAS
755
WWUS53 KGRR 112359
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
759 PM EDT Mon Oct 11 2021
MIC159-120008-
/O.CAN.KGRR.SV.W.0099.000000T0000Z-211012T0015Z/
Van Buren MI-
759 PM EDT Mon Oct 11 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN VAN BUREN COUNTY
IS CANCELLED...
The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning has
been cancelled.
To report trees down blocking roads or creating other hazards,
contact your nearest law enforcement agency. They will relay your
report to the National Weather Service Grand Rapids.
LAT...LON 4225 8576 4241 8617 4242 8577
TIME...MOT...LOC 2357Z 202DEG 43KT 4250 8608 4236 8578
$$
CASThe office that day
Everything else NWS Grand Rapids, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 11, 4:49 PM EDT | Severe Thunderstorm Warning | GRR | Osceola | 26 min |
| 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, 7:30 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.