Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 9, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this severe thunderstorm warning at Jun 18, 2021, 5:45 AM EDT for Allegan County, Kent County, Ottawa County, Michigan. It was in force for 45 min. 2 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
- Jun 18, 2021, 5:45 AM EDT (09:45 UTC)
- Expired
- Jun 18, 2021, 6:30 AM EDT
- In force
- 45 min
- Issued by
- NWS Grand Rapids, MI
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Allegan County, MI, Kent County, MI, Ottawa County, MI
The radar
The Grand Rapids radar (KGRR), 23 km from the middle of the area, began a volume at 09:49 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 |
|---|---|---|---|
| Jun 18, 6:03 AM EDT | TSTM WND DMG | 2 E Grand Valley, MI | TREES AND WIRES DOWN. |
| Jun 18, 6:17 AM EDT | TSTM WND GST 42 | East Grand Rapids, MI | AT MEMORIAL FIELD, EAST GRAND RAPIDS HIGH SCHOOL. |
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 00:00Z, 9.8 hours before the alert went out and 197 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
- 2534 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 123 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
851
WUUS53 KGRR 180945
SVRGRR
MIC005-081-139-181030-
/O.NEW.KGRR.SV.W.0009.210618T0945Z-210618T1030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Rapids MI
545 AM EDT Fri Jun 18 2021
The National Weather Service in Grand Rapids has issued a
* Severe Thunderstorm Warning for...
Northern Allegan County in southwestern Michigan...
Southwestern Kent County in southwestern Michigan...
Ottawa County in southwestern Michigan...
* Until 630 AM EDT.
* At 545 AM EDT, severe thunderstorms were located along a line
extending from near Fruitport to near Saugatuck, moving southeast
at 60 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... Allegan...
Wyoming... Kentwood... Walker...
Grandville... East Grand Rapids... Hudsonville...
Zeeland... Coopersville... Wayland...
Caledonia... Fennville... Martin...
Beechwood... Jenison... Allendale...
Dorr... Conklin...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4312 8616 4312 8591 4315 8591 4307 8551
4277 8551 4277 8555 4247 8555 4262 8619
TIME...MOT...LOC 0945Z 297DEG 51KT 4310 8609 4267 8613
HAIL...0.75IN
WIND...60MPH
$$
NJJ2 follow-up statements
672
WWUS53 KGRR 181013
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
613 AM EDT Fri Jun 18 2021
MIC139-181023-
/O.CAN.KGRR.SV.W.0009.000000T0000Z-210618T1030Z/
Ottawa MI-
613 AM EDT Fri Jun 18 2021
...THE SEVERE THUNDERSTORM WARNING FOR OTTAWA COUNTY IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
LAT...LON 4254 8583 4277 8580 4277 8578 4313 8579
4307 8551 4277 8551 4277 8555 4247 8555
TIME...MOT...LOC 1013Z 270DEG 51KT 4294 8565 4251 8570
$$
MIC005-081-181030-
/O.CON.KGRR.SV.W.0009.000000T0000Z-210618T1030Z/
Allegan MI-Kent MI-
613 AM EDT Fri Jun 18 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 AM EDT
FOR NORTHEASTERN ALLEGAN AND SOUTHWESTERN KENT COUNTIES...
At 613 AM EDT, severe thunderstorms were located along a line
extending from near Grand Rapids to near Otsego, moving east at 60
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... Wyoming... Kentwood...
Walker... Grandville... East Grand Rapids...
Wayland... Caledonia... Martin...
Dorr... Hopkins... Dutton...
Cutlerville... Bradley... Belmont...
Comstock Park... Northview... Green Lake...
Shelbyville... Byron Center...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4254 8583 4277 8580 4277 8578 4313 8579
4307 8551 4277 8551 4277 8555 4247 8555
TIME...MOT...LOC 1013Z 270DEG 51KT 4294 8565 4251 8570
HAIL...0.75IN
WIND...60MPH
$$
NJJ451
WWUS53 KGRR 181025
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
625 AM EDT Fri Jun 18 2021
MIC005-081-181035-
/O.EXP.KGRR.SV.W.0009.000000T0000Z-210618T1030Z/
Allegan MI-Kent MI-
625 AM EDT Fri Jun 18 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ALLEGAN AND
SOUTHWESTERN KENT COUNTIES WILL EXPIRE AT 630 AM EDT...
The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning will
be allowed to expire.
LAT...LON 4254 8583 4277 8580 4277 8578 4313 8579
4307 8551 4277 8551 4277 8555 4247 8555
TIME...MOT...LOC 1025Z 270DEG 51KT 4287 8545 4244 8550
$$
NJJThe office that day
Everything else NWS Grand Rapids, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 4:02 AM EDT | Special Marine Warning | GRR | 118 min | |
| Jun 18, 4:44 AM EDT | Special Weather Statement | GRR | Allegan, Barry, Calhoun, Clinton, Eaton, Gratiot and 9 more | 4 hr |
| Jun 18, 4:50 AM EDT | Special Marine Warning | GRR | 115 min | |
| Jun 18, 4:58 AM EDT | Special Weather Statement | GRR | Clare, Isabella, Lake, Mecosta, Newaygo, Oceana and 1 more | 4 hr |
| Jun 18, 5:49 AM EDT | Special Marine Warning | GRR | 116 min | |
| Jun 18, 6:02 AM EDT | Special Marine Warning | GRR | 58 min | |
| Jun 18, 6:47 AM EDT | Special Marine Warning | GRR | 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.