Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 82, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this severe thunderstorm warning at Sep 7, 2021, 1:51 PM EDT for Muskegon County, Oceana County, Michigan. It was in force for 54 min. 4 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
- Sep 7, 2021, 1:51 PM EDT (17:51 UTC)
- Expired
- Sep 7, 2021, 2:45 PM EDT
- In force
- 54 min
- Issued by
- NWS Grand Rapids, MI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Muskegon County, MI, Oceana County, MI
The radar
The Grand Rapids radar (KGRR), 80 km from the middle of the area, began a volume at 17:52 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 |
|---|---|---|---|
| Sep 7, 2:17 PM EDT | TSTM WND DMG | 3 Ene Muskegon, MI | PHOTO OF UPROOTED TREE ON CAMPUS OF BAKER COLLEGE IN MUSKEGON...RELAYED VIA SOCIAL MEDIA FROM WOOD TV. TIME ESTIMATED FROM RADAR. |
| Sep 7, 2:17 PM EDT | TSTM WND DMG | Muskegon, MI | PHOTO OF VERY LARGE OAK TREE UPROOTED. RELAYED VIA SOCIAL MEDIA FROM WOOD TV. TIME ESTIMATED FROM RADAR. |
| Sep 7, 2:20 PM EDT | TSTM WND DMG | 4 Ene Muskegon, MI | DAMAGE TO CARDINAL ELEMENTARY SCHOOL. LARGE TREE UPROOTED AND LARGE BRANCHES ON GROUND FROM VARIOUS TREES. ROOF ABOVE THE CAFETERIA AND GYM DAMAGED, CAUSING FLOODING AND WATER DAMAGE. TIME ESTIMATED FROM RADAR. |
| Sep 7, 2:35 PM EDT | TSTM WND DMG | 2 Wnw Slocum, MI | PHOTO OF SNAPPED TREE LIMBS ON SOCIAL MEDIA...RELAYED VIA WZZM. TIME ESTIMATED FROM RADAR. |
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 |
|---|---|---|---|
| Sep 7, 12:21 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Green Bay/Straub, WI (KGRB), launched 12:00Z, 5.9 hours before the alert went out and 192 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
- 14 J/kg
- Mixed-layer CIN
- -216 J/kg
- Mixed-layer LCL
- 1012 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- -120 m²/s²
- 0-3 km storm-relative helicity
- 35 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.1
The text
As transmitted.
406
WUUS53 KGRR 071751
SVRGRR
MIC121-127-071845-
/O.NEW.KGRR.SV.W.0082.210907T1751Z-210907T1845Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Rapids MI
151 PM EDT Tue Sep 7 2021
The National Weather Service in Grand Rapids has issued a
* Severe Thunderstorm Warning for...
Muskegon County in west central Michigan...
Oceana County in west central Michigan...
* Until 245 PM EDT.
* At 150 PM EDT, a severe thunderstorm was located 20 miles southwest
of Montague, or 23 miles west of Muskegon, moving east at 65 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
Muskegon... Hart... Shelby...
Muskegon Heights... Roosevelt Park... North Muskegon...
Whitehall... Montague... Lakewood Club...
Ravenna... Fruitport... Hesperia...
Silver Lake SP... Norton Shores... Dalton...
Holton... Sullivan... Elbridge...
New Era... Rothbury...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4367 8654 4372 8649 4372 8604 4330 8604
4329 8579 4321 8579 4321 8591 4312 8591
4312 8627 4332 8640 4350 8647 4362 8654
TIME...MOT...LOC 1750Z 268DEG 56KT 4326 8672
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
HOVING3 follow-up statements
270
WWUS53 KGRR 071805
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
205 PM EDT Tue Sep 7 2021
MIC121-127-071845-
/O.CON.KGRR.SV.W.0082.000000T0000Z-210907T1845Z/
Muskegon MI-Oceana MI-
205 PM EDT Tue Sep 7 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM EDT
FOR MUSKEGON AND OCEANA COUNTIES...
At 204 PM EDT, severe thunderstorms were located along a line
extending from near Montague to 11 miles west of North Muskegon,
moving east at 65 mph.
THESE ARE DESTRUCTIVE STORMS FOR Muskegon.
HAZARD...Baseball size hail and 70 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be severely injured.
Expect shattered windows, extensive damage to roofs,
siding, and vehicles.
Locations impacted include...
Muskegon... Hart... Shelby...
Muskegon Heights... Roosevelt Park... North Muskegon...
Whitehall... Montague... Lakewood Club...
Ravenna... Fruitport... Hesperia...
Silver Lake SP... Norton Shores... Dalton...
Holton... Sullivan... Elbridge...
New Era... Rothbury...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
These are dangerous storms. Prepare immediately for large destructive
hail capable of producing significant damage. People outside should
move to a shelter, inside a strong building and away from windows.
Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.
&&
LAT...LON 4367 8654 4372 8649 4372 8604 4330 8604
4329 8579 4321 8579 4321 8591 4312 8591
4312 8627 4332 8640 4350 8647 4362 8654
TIME...MOT...LOC 1804Z 266DEG 56KT 4337 8643 4323 8650
TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...DESTRUCTIVE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...2.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
NJJ436
WWUS53 KGRR 071826
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
226 PM EDT Tue Sep 7 2021
MIC127-071835-
/O.CAN.KGRR.SV.W.0082.000000T0000Z-210907T1845Z/
Oceana MI-
226 PM EDT Tue Sep 7 2021
...THE SEVERE THUNDERSTORM WARNING FOR OCEANA COUNTY IS CANCELLED...
The storms which prompted the warning has moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 700 PM EDT for
southwestern and west central Michigan.
LAT...LON 4317 8630 4340 8623 4342 8604 4330 8604
4329 8579 4321 8579 4321 8591 4312 8591
4312 8627
TIME...MOT...LOC 1825Z 267DEG 47KT 4331 8612 4317 8619
$$
MIC121-071845-
/O.CON.KGRR.SV.W.0082.000000T0000Z-210907T1845Z/
Muskegon MI-
226 PM EDT Tue Sep 7 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM EDT
FOR MUSKEGON COUNTY...
At 225 PM EDT, severe thunderstorms were located along a line
extending from 8 miles southeast of Lakewood Club to near Muskegon
Heights, moving east at 55 mph.
HAZARD...Golf ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
Locations impacted include...
Muskegon... Muskegon Heights... Roosevelt Park...
North Muskegon... Lakewood Club... Ravenna...
Fruitport... Norton Shores... Holton...
Sullivan... Casnovia... Wolf Lake...
Twin Lake... Slocum... Cloverville...
Bailey...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.
Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.
&&
LAT...LON 4317 8630 4340 8623 4342 8604 4330 8604
4329 8579 4321 8579 4321 8591 4312 8591
4312 8627
TIME...MOT...LOC 1825Z 267DEG 47KT 4331 8612 4317 8619
TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
NJJ983
WWUS53 KGRR 071845
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
245 PM EDT Tue Sep 7 2021
MIC121-071855-
/O.EXP.KGRR.SV.W.0082.000000T0000Z-210907T1845Z/
Muskegon MI-
245 PM EDT Tue Sep 7 2021
...THE SEVERE THUNDERSTORM WARNING FOR MUSKEGON COUNTY HAS EXPIRED...
The storms which prompted the warning have moved out of the area.
Therefore, the warning has been allowed to expire.
A Severe Thunderstorm Watch remains in effect until 700 PM EDT for
southwestern and west central Michigan.
LAT...LON 4317 8630 4340 8623 4342 8604 4330 8604
4329 8579 4321 8579 4321 8591 4312 8591
4312 8627
TIME...MOT...LOC 1845Z 268DEG 56KT 4332 8569 4318 8576
$$
NJJThe office that day
Everything else NWS Grand Rapids, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 7, 11:50 AM EDT | Special Marine Warning | GRR | 91 min | |
| Sep 7, 12:25 PM EDT | Severe Thunderstorm Warning | GRR | Mason | 65 min |
| Sep 7, 12:32 PM EDT | Severe Thunderstorm Warning | GRR | Lake, Osceola | 58 min |
| Sep 7, 12:40 PM EDT | Special Marine Warning | GRR | 87 min | |
| Sep 7, 12:54 PM EDT | Severe Thunderstorm Warning | GRR | Oceana | 66 min |
| Sep 7, 1:08 PM EDT | Tornado Warning | GRR | Clare, Osceola | 40 min |
| Sep 7, 1:13 PM EDT | Severe Thunderstorm Warning | GRR | Lake, Newaygo | 37 min |
| Sep 7, 1:30 PM EDT | Special Marine Warning | GRR | 60 min | |
| Sep 7, 1:39 PM EDT | Severe Thunderstorm Warning | GRR | Osceola | 38 min |
| Sep 7, 2:01 PM EDT | Lakeshore Flood Advisory | GRR | Muskegon | 4 hr |
| Sep 7, 2:03 PM EDT | Severe Thunderstorm Warning | GRR | Clare | 46 min |
| Sep 7, 2:13 PM EDT | Tornado Warning | GRR | Clare | 30 min |
| Sep 7, 2:20 PM EDT | Severe Thunderstorm Warning | GRR | Isabella, Mecosta, Newaygo | 55 min |
| Sep 7, 2:23 PM EDT | Tornado Warning | GRR | Isabella | 21 min |
| Sep 7, 2:40 PM EDT | Severe Thunderstorm Warning | GRR | Kent, Ottawa | 39 min |
| Sep 7, 3:04 PM EDT | Severe Thunderstorm Warning | GRR | Montcalm | 56 min |
| Sep 7, 3:26 PM EDT | Severe Thunderstorm Warning | GRR | Clinton, Gratiot, Ionia | 64 min |
| Sep 7, 3:37 PM EDT | Special Marine Warning | GRR | 83 min | |
| Sep 7, 4:05 PM EDT | Severe Thunderstorm Warning | GRR | Van Buren | 55 min |
| Sep 7, 4:49 PM EDT | Severe Thunderstorm Warning | GRR | Allegan, Barry, Kalamazoo | 42 min |
| Sep 7, 5:13 PM EDT | Severe Thunderstorm Warning | GRR | Barry, Calhoun, Eaton | 47 min |
| Sep 7, 5:40 PM EDT | Severe Thunderstorm Warning | GRR | Ingham, Jackson | 50 min |
| Sep 7, 6:01 PM EDT | Severe Thunderstorm Warning | GRR | Clinton | 29 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.