Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 73, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this severe thunderstorm warning at Aug 29, 2021, 3:18 PM EDT for Muskegon County, Michigan. It was in force for 28 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 29, 2021, 3:18 PM EDT (19:18 UTC)
- Expired
- Aug 29, 2021, 3:46 PM EDT
- In force
- 28 min
- Issued by
- NWS Grand Rapids, MI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Muskegon County, MI
The radar
The Grand Rapids radar (KGRR), 70 km from the middle of the area, began a volume at 19:23 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.
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 29, 1:46 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Green Bay/Straub, WI (KGRB), launched 12:00Z, 7.3 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
- 1272 J/kg
- Mixed-layer CIN
- -49 J/kg
- Mixed-layer LCL
- 845 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 207 m²/s²
- 0-3 km storm-relative helicity
- 216 m²/s²
- Significant tornado parameter
- 1.3
- Supercell composite
- 6.5
The text
As transmitted.
698
WUUS53 KGRR 291918
SVRGRR
MIC121-292015-
/O.NEW.KGRR.SV.W.0073.210829T1918Z-210829T2015Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Rapids MI
318 PM EDT Sun Aug 29 2021
The National Weather Service in Grand Rapids has issued a
* Severe Thunderstorm Warning for...
Central Muskegon County in west central Michigan...
* Until 415 PM EDT.
* At 317 PM EDT, a severe thunderstorm was located 13 miles west of
Roosevelt Park, or 14 miles west of Muskegon, moving east at 45
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... Muskegon Heights... Roosevelt Park...
North Muskegon... Lakewood Club... Fruitport...
Norton Shores... Dalton... Holton...
Sullivan... Brunswick... Muskegon SP...
Wolf Lake... Duck Lake SP... Twin Lake...
Cloverville...
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 this storm. 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 4344 8604 4312 8603 4312 8627 4332 8640
4335 8641
TIME...MOT...LOC 1917Z 266DEG 38KT 4320 8655
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
NJJ1 follow-up statement
453
WWUS53 KGRR 291946
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
346 PM EDT Sun Aug 29 2021
MIC121-291955-
/O.CAN.KGRR.SV.W.0073.000000T0000Z-210829T2015Z/
Muskegon MI-
346 PM EDT Sun Aug 29 2021
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MUSKEGON COUNTY IS
CANCELLED...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled. However, gusty winds are
still possible with this thunderstorm.
A Severe Thunderstorm Watch remains in effect until 700 PM EDT for
west central Michigan.
LAT...LON 4344 8604 4312 8603 4312 8627 4332 8640
4335 8641
TIME...MOT...LOC 1944Z 266DEG 38KT 4322 8613
$$
JCThe office that day
Everything else NWS Grand Rapids, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 28, 9:02 PM EDT | Special Weather Statement | GRR | Clinton | 58 min |
| Aug 28, 11:14 PM EDT | Special Weather Statement | GRR | Clinton | 61 min |
| Aug 29, 2:21 AM EDT | Areal Flood Advisory | GRR | Mason | 5 hr |
| Aug 29, 1:54 PM EDT | Special Marine Warning | GRR | 2 hr | |
| Aug 29, 2:33 PM EDT | Flash Flood Warning | GRR | Lake | 8 hr |
| Aug 29, 2:49 PM EDT | Special Marine Warning | GRR | 113 min | |
| Aug 29, 3:11 PM EDT | Areal Flood Warning | GRR | Mason | 17 hr |
| Aug 29, 3:26 PM EDT | Severe Thunderstorm Warning | GRR | Barry, Ionia, Kent | 28 min |
| Aug 29, 4:04 PM EDT | Severe Thunderstorm Warning | GRR | Clinton, Ionia | 56 min |
| Aug 29, 5:21 PM EDT | Severe Thunderstorm Warning | GRR | Ingham | 24 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.