Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 40, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this severe thunderstorm warning at Jul 29, 2021, 4:05 AM EDT for Allegan County, Ottawa County, Van Buren County, Michigan. It was in force for 55 min. 10 reports 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
- Jul 29, 2021, 4:05 AM EDT (08:05 UTC)
- Expired
- Jul 29, 2021, 5:00 AM EDT
- In force
- 55 min
- Issued by
- NWS Grand Rapids, MI
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Allegan County, MI, Ottawa County, MI, Van Buren County, MI
The radar
The Grand Rapids radar (KGRR), 57 km from the middle of the area, began a volume at 08:10 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 |
|---|---|---|---|
| Jul 29, 4:12 AM EDT | TSTM WND GST 58 | Macatawa, MI | BUOY STATION HLNM4 HOLLAND HARBOR. |
| Jul 29, 4:20 AM EDT | TSTM WND DMG | 1 Ene Beechwood, MI | LIGHT POLE BLOWN DOWN. |
| Jul 29, 4:21 AM EDT | TSTM WND DMG | 2 Ese South Haven, MI | TREES DOWN ALONG 8TH AVENUE BETWEEN 72ND AND 68TH STREET. |
| Jul 29, 4:21 AM EDT | TSTM WND GST 41 | 2 S Holland, MI | ASOS STATION KBIV W MICH REGIONAL ARPT. |
| Jul 29, 4:35 AM EDT | TSTM WND GST 40 | 4 Sse South Haven, MI | AWOS STATION KLWA SOUTH HAVEN RGNL ARPT. |
| Jul 29, 4:45 AM EDT | TSTM WND DMG | 2 Sse Otsego, MI | TREES ACROSS ROADWAY. TIME ESTIMATED FROM RADAR. |
| Jul 29, 4:55 AM EDT | TSTM WND GST 36 | 1 Ene Allegan, MI | MESONET STATION EW9318 ALLEGAN. |
| Jul 29, 4:58 AM EDT | TSTM WND DMG | 1 W Allegan, MI | TREES AND POWER LINES DOWN. |
| Jul 29, 5:04 AM EDT | TSTM WND DMG | 2 Nw Otsego, MI | WIRES DOWN. |
| Jul 29, 5:10 AM EDT | TSTM WND GST 51 | 1 Ssw Wayland, MI | MESONET STATION BDLM4 PLAINWELL. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 29, 2:00 AM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Detroit, MI (KDTX), launched 00:00Z, 8.1 hours before the alert went out and 210 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
- 219 J/kg
- Mixed-layer CIN
- -51 J/kg
- Mixed-layer LCL
- 1416 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 103 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
387
WUUS53 KGRR 290805
SVRGRR
MIC005-139-159-290900-
/O.NEW.KGRR.SV.W.0040.210729T0805Z-210729T0900Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Rapids MI
405 AM EDT Thu Jul 29 2021
The National Weather Service in Grand Rapids has issued a
* Severe Thunderstorm Warning for...
Van Buren County in southwestern Michigan...
Allegan County in southwestern Michigan...
Southern Ottawa County in southwestern Michigan...
* Until 500 AM EDT.
* At 404 AM EDT, severe thunderstorms were located along a line
extending from 8 miles northwest of Holland to 8 miles west of
Stevensville, moving east at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Holland... Allegan... South Haven...
Paw Paw... Walker... Grandville...
Hudsonville... Zeeland... Wayland...
Otsego... Plainwell... Hartford...
Mattawan... Lawton... Bangor...
Decatur... Fennville... Saugatuck...
Martin... Van Buren SP...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4207 8622 4224 8622 4224 8637 4246 8625
4264 8623 4270 8620 4297 8622 4296 8578
4277 8578 4277 8555 4267 8554 4242 8563
4242 8576 4207 8576
TIME...MOT...LOC 0804Z 277DEG 34KT 4289 8628 4204 8668
HAIL...<.75IN
WIND...60MPH
$$
DUKE2 follow-up statements
505
WWUS53 KGRR 290823
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
423 AM EDT Thu Jul 29 2021
MIC005-139-159-290900-
/O.CON.KGRR.SV.W.0040.000000T0000Z-210729T0900Z/
Van Buren MI-Allegan MI-Ottawa MI-
423 AM EDT Thu Jul 29 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 AM EDT
FOR VAN BUREN...ALLEGAN AND SOUTHERN OTTAWA COUNTIES...
At 422 AM EDT, severe thunderstorms were located along a line
extending from near Zeeland to near Fennville to near Stevensville,
moving east at 50 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Public observation. At 407 AM, a mesonet station near
Holland reported a 61 mph wind gust.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Holland... Allegan... South Haven...
Paw Paw... Walker... Grandville...
Hudsonville... Zeeland... Wayland...
Otsego... Plainwell... Hartford...
Mattawan... Lawton... Bangor...
Decatur... Fennville... Saugatuck...
Martin... Van Buren SP...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4207 8622 4224 8622 4224 8637 4246 8625
4264 8623 4270 8620 4297 8622 4296 8578
4277 8578 4277 8555 4267 8554 4242 8563
4242 8576 4207 8576
TIME...MOT...LOC 0822Z 280DEG 44KT 4287 8607 4260 8604 4202 8647
HAIL...0.75IN
WIND...60MPH
$$
NJJ970
WWUS53 KGRR 290835
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
435 AM EDT Thu Jul 29 2021
MIC139-290845-
/O.CAN.KGRR.SV.W.0040.000000T0000Z-210729T0900Z/
Ottawa MI-
435 AM EDT Thu Jul 29 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN OTTAWA COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 900 AM EDT for
southwestern Michigan.
LAT...LON 4207 8622 4224 8622 4224 8637 4246 8625
4264 8623 4270 8620 4277 8620 4277 8555
4266 8554 4242 8563 4242 8576 4207 8576
TIME...MOT...LOC 0835Z 284DEG 31KT 4275 8594 4258 8591 4215 8618
$$
MIC005-159-290900-
/O.CON.KGRR.SV.W.0040.000000T0000Z-210729T0900Z/
Van Buren MI-Allegan MI-
435 AM EDT Thu Jul 29 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 AM EDT
FOR VAN BUREN AND ALLEGAN COUNTIES...
At 435 AM EDT, severe thunderstorms were located along a line
extending from 6 miles southeast of Zeeland to 5 miles northwest of
Allegan to near Hartford, moving east at 35 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Public.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Holland... Allegan... South Haven...
Paw Paw... Wayland... Otsego...
Plainwell... Hartford... Mattawan...
Lawton... Bangor... Decatur...
Fennville... Saugatuck... Martin...
Van Buren SP... Lake Michigan Beach... Dorr...
Pine Grove... Covert...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4207 8622 4224 8622 4224 8637 4246 8625
4264 8623 4270 8620 4277 8620 4277 8555
4266 8554 4242 8563 4242 8576 4207 8576
TIME...MOT...LOC 0835Z 284DEG 31KT 4275 8594 4258 8591 4215 8618
TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
$$
NJJThe office that day
Everything else NWS Grand Rapids, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 3:32 AM EDT | Special Marine Warning | GRR | 88 min | |
| Jul 29, 4:47 AM EDT | Severe Thunderstorm Warning | GRR | Allegan, Barry, Calhoun, Kalamazoo, Van Buren | 58 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.