Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 41, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this severe thunderstorm warning at Jul 29, 2021, 4:47 AM EDT for 5 counties in Michigan. It was in force for 58 min. 11 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
- Jul 29, 2021, 4:47 AM EDT (08:47 UTC)
- Expired
- Jul 29, 2021, 5:45 AM EDT
- In force
- 58 min
- Issued by
- NWS Grand Rapids, MI
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Allegan County, MI, Barry County, MI, Calhoun County, MI, Kalamazoo County, MI, Van Buren County, MI
The radar
The Grand Rapids radar (KGRR), 66 km from the middle of the area, began a volume at 08:51 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 |
|---|---|---|---|
| Jul 29, 4:55 AM EDT | TSTM WND GST 36 | 1 Ene Allegan, MI | MESONET STATION EW9318 ALLEGAN. |
| Jul 29, 5:03 AM EDT | TSTM WND DMG | 2 N Cooper, MI | TREES AND WIRES DOWN. TIME ESTIMATED FROM RADAR. |
| Jul 29, 5:04 AM EDT | TSTM WND DMG | 2 Nw Otsego, MI | WIRES DOWN. |
| Jul 29, 5:04 AM EDT | TSTM WND DMG | Cooper, MI | WIRES DOWN. |
| Jul 29, 5:05 AM EDT | TSTM WND DMG | 3 E Cooper, MI | TREES IN ROADWAY. |
| Jul 29, 5:06 AM EDT | TSTM WND DMG | 2 Wnw Parchment, MI | WIRES DOWN. |
| Jul 29, 5:10 AM EDT | TSTM WND GST 51 | 1 Ssw Wayland, MI | MESONET STATION BDLM4 PLAINWELL. |
| Jul 29, 5:14 AM EDT | TSTM WND DMG | 3 Ssw Vicksburg, MI | TREES BLOCKING ROAD. TIME ESTIMATED BY RADAR. |
| Jul 29, 5:14 AM EDT | TSTM WND DMG | 3 Sw Vicksburg, MI | TREE DOWN ON ROAD. |
| Jul 29, 5:15 AM EDT | TSTM WND DMG | 2 S Vicksburg, MI | TREES DOWN ON ROAD. |
| Jul 29, 5:42 AM EDT | TSTM WND GST 45 | 3 Ne Portage, MI | ASOS STATION KAZO KZOO/BATTLE CREEK INTL AIRPORT. |
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 |
|---|---|---|---|
| Jul 29, 2:00 AM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Detroit, MI (KDTX), launched 00:00Z, 8.8 hours before the alert went out and 186 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
- 219 J/kg
- Mixed-layer CIN
- -51 J/kg
- Mixed-layer LCL
- 1416 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 103 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
630
WUUS53 KGRR 290847
SVRGRR
MIC005-015-025-077-159-290945-
/O.NEW.KGRR.SV.W.0041.210729T0847Z-210729T0945Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Rapids MI
447 AM EDT Thu Jul 29 2021
The National Weather Service in Grand Rapids has issued a
* Severe Thunderstorm Warning for...
Western Calhoun County in south central Michigan...
Eastern Van Buren County in southwestern Michigan...
Eastern Allegan County in southwestern Michigan...
Southern Barry County in southwestern Michigan...
Kalamazoo County in southwestern Michigan...
* Until 545 AM EDT.
* At 446 AM EDT, severe thunderstorms were located along a line
extending from 6 miles west of Wayland to 9 miles southwest of
Otsego to near Decatur, moving southeast at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Kalamazoo... Portage... Battle Creek...
Allegan... Paw Paw... Otsego...
Plainwell... Vicksburg... Galesburg...
Mattawan... Lawton... Schoolcraft...
Climax... Richland... Martin...
Burlington... Brownlee Park... Comstock Northwest...
Gull Lake... Westwood...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4207 8595 4238 8590 4269 8580 4255 8507
4208 8508
TIME...MOT...LOC 0846Z 292DEG 41KT 4264 8577 4235 8581 4206 8595
HAIL...<.75IN
WIND...60MPH
$$
DUKE2 follow-up statements
737
WWUS53 KGRR 290931
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
531 AM EDT Thu Jul 29 2021
MIC005-015-159-290941-
/O.CAN.KGRR.SV.W.0041.000000T0000Z-210729T0945Z/
Van Buren MI-Allegan MI-Barry MI-
531 AM EDT Thu Jul 29 2021
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN VAN BUREN...EASTERN
ALLEGAN AND SOUTHERN BARRY COUNTIES IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 900 AM EDT for
southwestern Michigan.
LAT...LON 4207 8558 4215 8557 4227 8536 4225 8508
4208 8508
TIME...MOT...LOC 0931Z 312DEG 44KT 4215 8506 4209 8521 4208 8542
$$
MIC025-077-290945-
/O.CON.KGRR.SV.W.0041.000000T0000Z-210729T0945Z/
Calhoun MI-Kalamazoo MI-
531 AM EDT Thu Jul 29 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 AM EDT
FOR SOUTHWESTERN CALHOUN AND SOUTHEASTERN KALAMAZOO COUNTIES...
At 531 AM EDT, severe thunderstorms were located along a line
extending from near Burlington to near Union City to 6 miles
southeast of Vicksburg, moving southeast 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...
Portage... Battle Creek... Vicksburg...
Climax... Burlington... Fulton...
Athens... Pine Creek... Scotts...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4207 8558 4215 8557 4227 8536 4225 8508
4208 8508
TIME...MOT...LOC 0931Z 312DEG 44KT 4215 8506 4209 8521 4208 8542
HAIL...0.75IN
WIND...60MPH
$$
NJJ131
WWUS53 KGRR 290941
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
541 AM EDT Thu Jul 29 2021
MIC025-077-290951-
/O.EXP.KGRR.SV.W.0041.000000T0000Z-210729T0945Z/
Calhoun MI-Kalamazoo MI-
541 AM EDT Thu Jul 29 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN CALHOUN AND
SOUTHEASTERN KALAMAZOO COUNTIES WILL EXPIRE AT 545 AM EDT...
The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning will
be allowed to expire.
A Severe Thunderstorm Watch remains in effect until 900 AM EDT for
southwestern Michigan.
LAT...LON 4207 8558 4215 8557 4227 8536 4225 8508
4208 8508
TIME...MOT...LOC 0941Z 292DEG 41KT 4211 8494 4205 8509 4204 8530
$$
NJJThe office that day
Everything else NWS Grand Rapids, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 3:32 AM EDT | Special Marine Warning | GRR | 88 min | |
| Jul 29, 4:05 AM EDT | Severe Thunderstorm Warning | GRR | Allegan, Ottawa, Van Buren | 55 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.