Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 42, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this severe thunderstorm warning at Aug 10, 2021, 9:40 PM EDT for 6 counties in Michigan. It was in force for 73 min. 12 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
- Aug 10, 2021, 9:40 PM EDT (01:40 UTC)
- Expired
- Aug 10, 2021, 10:53 PM EDT
- In force
- 73 min
- Issued by
- NWS Grand Rapids, MI
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Allegan County, MI, Mason County, MI, Muskegon County, MI, Oceana County, MI, Ottawa County, MI, Van Buren County, MI
The radar
The Grand Rapids radar (KGRR), 45 km from the middle of the area, began a volume at 01:44 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 |
|---|---|---|---|
| Aug 10, 10:01 PM EDT | TSTM WND GST 52 | 1 Ene Norton Shores, MI | ASOS STATION KMKG MUSKEGON COUNTY AIRPORT. |
| Aug 10, 10:05 PM EDT | TSTM WND GST 41 | 3 Ne Shelby, MI | AWOS STATION C049 2 NE SHELBY. |
| Aug 10, 10:08 PM EDT | TSTM WND GST 41 | 2 Wsw Montague, MI | MESONET STATION FW0475 MONTAGUE. |
| Aug 10, 10:10 PM EDT | TSTM WND GST 66 | 3 Ne Pentwater, MI | WIND GUST AT MASON-OCEANA 911 CENTER. |
| Aug 10, 10:11 PM EDT | TSTM WND DMG | Ludington, MI | LARGE TREE UPROOTED AND FELL ONTO FOSTER ELEMENTARY SCHOOL. POWER OUT ACROSS MUCH OF LUDINGTON. |
| Aug 10, 10:12 PM EDT | TSTM WND GST 57 | 1 S Ludington, MI | PEAK GUST AT LUDINGTON NOAA NOS WATER LEVEL MONITORING STATION 9087023 LDTM4. |
| Aug 10, 10:15 PM EDT | TSTM WND GST 54 | 2 Ene Ludington, MI | AWOS STATION KLDM LUDINGTON MASON. |
| Aug 10, 10:15 PM EDT | TSTM WND GST 59 | 3 Ne Pentwater, MI | MESONET STATION EW6978 PENTWATER. |
| Aug 10, 10:20 PM EDT | TSTM WND DMG | Scottville, MI | MULTIPLE LARGE LIMBS SNAPPED FROM A HEALTHY MAPLE TREE. WOOD-CONSTRUCTED BARN ALSO DAMAGED. |
| Aug 10, 10:24 PM EDT | TSTM WND GST 50 | 1 S Ludington, MI | SMALL LIMBS DOWN. |
| Aug 10, 10:29 PM EDT | TSTM WND GST 68 | 2 Ese North Dorr, MI | MESONET STATION AV010 NORTH DORR. |
| Aug 10, 10:35 PM EDT | TSTM WND DMG | Wayland, MI | 3 LARGE TREES UPROOTED AND FELL ON A HOME. |
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 |
|---|---|---|---|
| Aug 10, 8:38 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Detroit, MI (KDTX), launched 00:00Z, 1.7 hours before the alert went out and 219 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
- 2462 J/kg
- Mixed-layer CIN
- -27 J/kg
- Mixed-layer LCL
- 962 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 81 m²/s²
- 0-3 km storm-relative helicity
- 207 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 3.7
The text
As transmitted.
804
WUUS53 KGRR 110140
SVRGRR
MIC005-105-121-127-139-159-110315-
/O.NEW.KGRR.SV.W.0042.210811T0140Z-210811T0315Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Rapids MI
940 PM EDT Tue Aug 10 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...
Ottawa County in southwestern Michigan...
Mason County in west central Michigan...
Muskegon County in west central Michigan...
Oceana County in west central Michigan...
* Until 1115 PM EDT.
* At 939 PM EDT, severe thunderstorms were located along a line
extending from 20 miles west of Ludington State Park to 15 miles
northwest of St. Joseph, moving east at 50 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Muskegon... Holland... Grand Haven...
Ludington... Allegan... South Haven...
Paw Paw... Hart... Ludington SP...
Walker... Shelby... Muskegon Heights...
Hudsonville... Zeeland... Coopersville...
Wayland... Otsego... Roosevelt Park...
Plainwell... North Muskegon...
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
4270 8620 4309 8625 4362 8654 4380 8643
4406 8651 4418 8639 4417 8604 4330 8604
4329 8579 4277 8578 4277 8555 4242 8554
4242 8576 4207 8576
TIME...MOT...LOC 0139Z 273DEG 45KT 4413 8687 4227 8668
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
TJT2 follow-up statements
543
WWUS53 KGRR 110213
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
1013 PM EDT Tue Aug 10 2021
MIC005-105-121-127-139-159-110315-
/O.CON.KGRR.SV.W.0042.000000T0000Z-210811T0315Z/
Van Buren MI-Allegan MI-Ottawa MI-Mason MI-Muskegon MI-Oceana MI-
1013 PM EDT Tue Aug 10 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM EDT
FOR VAN BUREN...ALLEGAN...OTTAWA...MASON...MUSKEGON AND OCEANA
COUNTIES...
At 1013 PM EDT, severe thunderstorms were located along a line
extending from near Free Soil to near Hartford, moving east at 60
mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Muskegon... Holland... Grand Haven...
Ludington... Allegan... South Haven...
Paw Paw... Hart... Ludington SP...
Walker... Shelby... Muskegon Heights...
Hudsonville... Zeeland... Coopersville...
Wayland... Otsego... Roosevelt Park...
Plainwell... North Muskegon...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4207 8622 4224 8622 4224 8637 4246 8625
4270 8620 4309 8625 4362 8654 4380 8643
4406 8651 4418 8639 4417 8604 4330 8604
4329 8579 4277 8578 4277 8555 4242 8554
4242 8576 4207 8576
TIME...MOT...LOC 0213Z 274DEG 52KT 4408 8625 4222 8608
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
04687
WWUS53 KGRR 110253
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
1053 PM EDT Tue Aug 10 2021
MIC005-105-121-127-139-159-110303-
/O.CAN.KGRR.SV.W.0042.000000T0000Z-210811T0315Z/
Van Buren MI-Allegan MI-Ottawa MI-Mason MI-Muskegon MI-Oceana MI-
1053 PM EDT Tue Aug 10 2021
...THE SEVERE THUNDERSTORM WARNING FOR VAN BUREN...ALLEGAN...
OTTAWA...MASON...MUSKEGON AND OCEANA COUNTIES IS CANCELLED...
The storms which prompted the warning have moved out of the area.
Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 300 AM EDT for
southwestern and west central Michigan.
LAT...LON 4207 8622 4224 8622 4224 8637 4246 8625
4270 8620 4309 8625 4362 8654 4380 8643
4406 8651 4418 8639 4417 8604 4330 8604
4329 8579 4277 8578 4277 8555 4242 8554
4242 8576 4207 8576
TIME...MOT...LOC 0253Z 273DEG 45KT 4405 8556 4219 8541
$$
04The office that day
Everything else NWS Grand Rapids, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 8:46 PM EDT | Special Marine Warning | GRR | 59 min | |
| Aug 10, 9:22 PM EDT | Special Weather Statement | GRR | Allegan, Barry, Calhoun, Clare, Clinton, Eaton and 16 more | 3 hr |
| Aug 10, 10:02 PM EDT | Severe Thunderstorm Warning | GRR | Barry, Kalamazoo, Kent, Lake, Newaygo | 58 min |
| Aug 10, 10:41 PM EDT | Severe Thunderstorm Warning | GRR | Calhoun, Eaton, Ionia, Mecosta, Montcalm, Osceola | 64 min |
| Aug 10, 11:09 PM EDT | Severe Thunderstorm Warning | GRR | Clare, Clinton, Gratiot, Ingham, Isabella, Jackson | 66 min |
| Aug 11, 11:45 AM EDT | Special Marine Warning | GRR | 90 min | |
| Aug 11, 12:40 PM EDT | Special Weather Statement | GRR | Kent | 65 min |
| Aug 11, 12:51 PM EDT | Severe Thunderstorm Warning | GRR | Allegan, Ottawa | 28 min |
| Aug 11, 1:07 PM EDT | Special Weather Statement | GRR | Kent | 83 min |
| Aug 11, 1:28 PM EDT | Special Weather Statement | GRR | Calhoun, Kalamazoo | 62 min |
| Aug 11, 1:39 PM EDT | Special Weather Statement | GRR | Clinton, Eaton, Gratiot, Ingham, Ionia, Jackson and 1 more | 2 hr |
| Aug 11, 1:56 PM EDT | Severe Thunderstorm Warning | GRR | Calhoun | 38 min |
| Aug 11, 2:08 PM EDT | Severe Thunderstorm Warning | GRR | Jackson | 58 min |
| Aug 11, 2:11 PM EDT | Severe Thunderstorm Warning | GRR | Clinton, Gratiot, Ionia, Montcalm | 49 min |
| Aug 11, 2:38 PM EDT | Severe Thunderstorm Warning | GRR | Ingham | 34 min |
| Aug 11, 6:26 PM EDT | Special Marine Warning | GRR | 2 hr | |
| Aug 11, 7:32 PM EDT | Severe Thunderstorm Warning | GRR | Muskegon | 43 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.