Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 96, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this severe thunderstorm warning at Sep 13, 2021, 11:37 AM EDT for Kent County, Ottawa County, Michigan. It was in force for 53 min. 14 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 13, 2021, 11:37 AM EDT (15:37 UTC)
- Expired
- Sep 13, 2021, 12:30 PM EDT
- In force
- 53 min
- Issued by
- NWS Grand Rapids, MI
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Kent County, MI, Ottawa County, MI
The radar
The Grand Rapids radar (KGRR), 33 km from the middle of the area, began a volume at 15:40 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 13, 11:55 AM EDT | HAIL 0.5 | Hudsonville, MI | TIME ESTIMATED FROM RADAR. |
| Sep 13, 12:00 PM EDT | HAIL 0.75 | 1 Sse Jenison, MI | REPORT FROM MPING: DIME (0.75 IN.). |
| Sep 13, 12:00 PM EDT | HAIL 1 | Jenison, MI | TIME ESTIMATED FROM RADAR. |
| Sep 13, 12:05 PM EDT | HAIL 0.5 | 2 Sw Wyoming, MI | |
| Sep 13, 12:07 PM EDT | HAIL 0.5 | 1 Wsw Grandville, MI | REPORT FROM MPING: HALF-INCH (0.50 IN.). |
| Sep 13, 12:09 PM EDT | HAIL 0.25 | 1 Sw Wyoming, MI | |
| Sep 13, 12:09 PM EDT | HAIL 0.5 | 2 Ssw Grandville, MI | REPORT FROM MPING: HALF-INCH (0.50 IN.). |
| Sep 13, 12:15 PM EDT | HAIL 0.5 | 2 S Grandville, MI | REPORT FROM MPING: HALF-INCH (0.50 IN.). |
| Sep 13, 12:15 PM EDT | HAIL 0.7 | 2 Nne Dutton, MI | HAIL LASTED FROM 12:15 TO 12:17 PM. MOSTLY PEA SIZE WITH A FEW LARGER TO DIME SIZE. |
| Sep 13, 12:18 PM EDT | HAIL 0.5 | 2 E Byron Center, MI | REPORT FROM MPING: HALF-INCH (0.50 IN.). |
| Sep 13, 12:20 PM EDT | HAIL 0.75 | 2 Se Cutlerville, MI | REPORT FROM MPING: DIME (0.75 IN.). |
| Sep 13, 12:23 PM EDT | HAIL 1 | 2 Ese Dutton, MI | |
| Sep 13, 12:27 PM EDT | HAIL 0.7 | Caledonia, MI | PEA TO DIME-SIZED HAIL. |
| Sep 13, 12:32 PM EDT | HAIL 0.5 | Alto, MI | TIME ESTIMATED FROM RADAR. |
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, 3.6 hours before the alert went out and 201 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 947 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 12 m²/s²
- 0-3 km storm-relative helicity
- 50 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
314
WUUS53 KGRR 131537
SVRGRR
MIC081-139-131630-
/O.NEW.KGRR.SV.W.0096.210913T1537Z-210913T1630Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Rapids MI
1137 AM EDT Mon Sep 13 2021
The National Weather Service in Grand Rapids has issued a
* Severe Thunderstorm Warning for...
Kent County in southwestern Michigan...
Ottawa County in southwestern Michigan...
* Until 1230 PM EDT.
* At 1137 AM EDT, severe thunderstorms were located along a line
extending from near Sparta to near Allendale to near Beechwood,
moving east at 50 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Grand Rapids... Holland... Lowell...
Wyoming... Kentwood... Walker...
Grandville... East Grand Rapids... Hudsonville...
Rockford... Zeeland... Coopersville...
Sparta... Caledonia... Allendale...
Beechwood... Jenison... Holland SP...
Ada... Grattan...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Large hail and damaging winds and continuous cloud to ground
lightning is occurring with these storms. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.
&&
LAT...LON 4312 8599 4312 8591 4316 8591 4321 8582
4321 8579 4326 8579 4329 8577 4323 8531
4277 8531 4277 8621 4299 8623
TIME...MOT...LOC 1537Z 284DEG 45KT 4321 8571 4299 8587 4283 8616
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
DUKE3 follow-up statements
370
WWUS53 KGRR 131600
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
1200 PM EDT Mon Sep 13 2021
MIC081-139-131630-
/O.CON.KGRR.SV.W.0096.000000T0000Z-210913T1630Z/
Kent MI-Ottawa MI-
1200 PM EDT Mon Sep 13 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 PM EDT
FOR KENT AND SOUTHEASTERN OTTAWA COUNTIES...
At 1200 PM EDT, a severe thunderstorm was located over Jenison, or 9
miles southwest of Grand Rapids, moving east at 40 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Grand Rapids... Holland... Lowell...
Wyoming... Kentwood... Walker...
Grandville... East Grand Rapids... Hudsonville...
Rockford... Zeeland... Coopersville...
Sparta... Caledonia... Beechwood...
Jenison... Allendale... Ada...
Grattan... Cedar Springs...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.
&&
LAT...LON 4323 8531 4277 8531 4277 8621 4293 8605
4328 8566
TIME...MOT...LOC 1600Z 248DEG 35KT 4289 8582
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MEADE170
WWUS53 KGRR 131616
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
1216 PM EDT Mon Sep 13 2021
MIC139-131625-
/O.CAN.KGRR.SV.W.0096.000000T0000Z-210913T1630Z/
Ottawa MI-
1216 PM EDT Mon Sep 13 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN OTTAWA COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4302 8531 4277 8531 4277 8578 4300 8579
TIME...MOT...LOC 1615Z 271DEG 34KT 4287 8562
$$
MIC081-131630-
/O.CON.KGRR.SV.W.0096.000000T0000Z-210913T1630Z/
Kent MI-
1216 PM EDT Mon Sep 13 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 PM EDT
FOR SOUTHERN KENT COUNTY...
At 1215 PM EDT, a severe thunderstorm was located over Kentwood, or 6
miles south of Grand Rapids, moving east at 40 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Grand Rapids... Lowell... Wyoming...
Kentwood... Walker... Grandville...
East Grand Rapids... Caledonia... Ada...
Dutton... Cutlerville... Alto...
Alaska... Byron Center... Cascade...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.
&&
LAT...LON 4302 8531 4277 8531 4277 8578 4300 8579
TIME...MOT...LOC 1615Z 271DEG 34KT 4287 8562
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MEADE342
WWUS53 KGRR 131631
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
1231 PM EDT Mon Sep 13 2021
MIC081-131639-
/O.EXP.KGRR.SV.W.0096.000000T0000Z-210913T1630Z/
Kent MI-
1231 PM EDT Mon Sep 13 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN KENT COUNTY WILL
EXPIRE AT 1230 PM EDT...
The storm which prompted the warning has weakened below severe
levels, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.
However, hail to 0.50 to 0.75 of an inch is still possible, along
with gusty winds to 45 mph, frequent lightning and heavy rain.
LAT...LON 4302 8531 4277 8531 4277 8578 4300 8579
TIME...MOT...LOC 1629Z 273DEG 48KT 4280 8541
$$
DUKEThe office that day
Everything else NWS Grand Rapids, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 13, 3:05 AM EDT | Small Craft Advisory | GRR | 56 hr | |
| Sep 13, 3:08 AM EDT | Beach Hazards Statement | GRR | Allegan, Mason, Muskegon, Oceana, Ottawa, Van Buren | 50 hr |
| Sep 13, 4:52 AM EDT | Special Marine Warning | GRR | 113 min | |
| Sep 13, 10:33 AM EDT | Special Marine Warning | GRR | 87 min | |
| Sep 13, 10:56 AM EDT | Special Weather Statement | GRR | Kent, Muskegon, Newaygo, Ottawa | 64 min |
| Sep 13, 12:36 PM EDT | Special Weather Statement | GRR | Clinton, Eaton, Gratiot, Ingham, Ionia | 84 min |
| Sep 13, 1:18 PM EDT | Severe Thunderstorm Warning | GRR | Ingham | 16 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.