Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 11, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this severe thunderstorm warning at Jun 20, 2021, 7:56 PM EDT for 5 counties in Michigan. It was in force for 64 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 20, 2021, 7:56 PM EDT (23:56 UTC)
- Expired
- Jun 20, 2021, 9:00 PM EDT
- In force
- 64 min
- Issued by
- NWS Grand Rapids, MI
- Area
- Storm-based polygon
- Hail
- 1.0 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), 62 km from the middle of the area, began a volume at 23:59 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 20, 8:00 PM EDT | TSTM WND DMG | 2 Nnw Schoolcraft, MI | WIND GUSTS OF 50 TO 60 MPH ESTIMATED. BRANCHES DOWN. VERY HEAVY RAINFALL WITH VISIBILITY NEAR ZERO. |
| Jun 20, 8:18 PM EDT | TSTM WND DMG | 3 W Fulton, MI | REPORT FROM MPING: 1-INCH TREE LIMBS BROKEN; SHINGLES BLOWN OFF. |
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 |
|---|---|---|---|
| Jun 20, 6:06 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Detroit, MI (KDTX), launched 12:00Z, 11.9 hours before the alert went out and 182 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
- 46 J/kg
- Mixed-layer CIN
- -265 J/kg
- Mixed-layer LCL
- 737 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 77 m²/s²
- 0-3 km storm-relative helicity
- 157 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.9
The text
As transmitted.
823
WUUS53 KGRR 202356
SVRGRR
MIC005-015-025-077-159-210100-
/O.NEW.KGRR.SV.W.0011.210620T2356Z-210621T0100Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Rapids MI
756 PM EDT Sun Jun 20 2021
The National Weather Service in Grand Rapids has issued a
* Severe Thunderstorm Warning for...
Calhoun County in south central Michigan...
Van Buren County in southwestern Michigan...
Allegan County in southwestern Michigan...
Southern Barry County in southwestern Michigan...
Kalamazoo County in southwestern Michigan...
* Until 900 PM EDT.
* At 755 PM EDT, severe thunderstorms were located along a line
extending from near South Haven to near Mattawan to 5 miles
northeast of Centreville, moving northeast at 35 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...
Kalamazoo... Portage... Albion...
Hastings... Marshall... Battle Creek...
Allegan... South Haven... Paw Paw...
Wayland... Otsego... Plainwell...
Vicksburg... Hartford... Galesburg...
Mattawan... Lawton... Bangor...
Decatur... Homer...
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 4207 8622 4224 8622 4224 8637 4246 8626
4274 8600 4263 8523 4250 8507 4242 8507
4242 8497 4221 8471 4207 8471
TIME...MOT...LOC 2355Z 232DEG 28KT 4237 8620 4219 8579 4200 8547
HAIL...1.00IN
WIND...60MPH
$$
DUKE2 follow-up statements
035
WWUS53 KGRR 210024
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
824 PM EDT Sun Jun 20 2021
MIC159-210034-
/O.CAN.KGRR.SV.W.0011.000000T0000Z-210621T0100Z/
Van Buren MI-
824 PM EDT Sun Jun 20 2021
...THE SEVERE THUNDERSTORM WARNING FOR VAN BUREN COUNTY IS
CANCELLED...
The storms which prompted the warning have weakened and moved out of
the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 100 AM EDT for
south central and southwestern Michigan.
LAT...LON 4207 8542 4243 8576 4243 8626 4248 8624
4274 8600 4263 8523 4250 8507 4242 8507
4242 8497 4221 8471 4207 8471
TIME...MOT...LOC 0024Z 244DEG 36KT 4249 8589 4231 8548 4212 8516
$$
MIC005-015-025-077-210100-
/O.CON.KGRR.SV.W.0011.000000T0000Z-210621T0100Z/
Calhoun MI-Allegan MI-Barry MI-Kalamazoo MI-
824 PM EDT Sun Jun 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR CALHOUN...ALLEGAN...SOUTHERN BARRY AND KALAMAZOO COUNTIES...
At 824 PM EDT, severe thunderstorms were located along a line
extending from near Allegan to near Comstock Northwest to near Union
City, moving northeast 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...
Kalamazoo... Portage... Albion...
Hastings... Marshall... Battle Creek...
Allegan... Wayland... Otsego...
Plainwell... Galesburg... Homer...
Union City... Fennville... Climax...
Richland... Martin... Burlington...
Brownlee Park... Comstock Northwest...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
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 4207 8542 4243 8576 4243 8626 4248 8624
4274 8600 4263 8523 4250 8507 4242 8507
4242 8497 4221 8471 4207 8471
TIME...MOT...LOC 0024Z 244DEG 36KT 4249 8589 4231 8548 4212 8516
HAIL...1.00IN
WIND...60MPH
$$
04135
WWUS53 KGRR 210044
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
844 PM EDT Sun Jun 20 2021
MIC005-077-210053-
/O.CAN.KGRR.SV.W.0011.000000T0000Z-210621T0100Z/
Allegan MI-Kalamazoo MI-
844 PM EDT Sun Jun 20 2021
...THE SEVERE THUNDERSTORM WARNING FOR ALLEGAN AND KALAMAZOO COUNTIES
IS CANCELLED...
The storms which prompted the warning have weakened and moved out of
the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 100 AM EDT for
south central and southwestern Michigan.
LAT...LON 4208 8507 4242 8530 4242 8554 4248 8553
4267 8554 4263 8523 4250 8507 4242 8507
4242 8497 4221 8471 4207 8471
TIME...MOT...LOC 0043Z 233DEG 40KT 4264 8562 4246 8521 4227 8489
$$
MIC015-025-210100-
/O.CON.KGRR.SV.W.0011.000000T0000Z-210621T0100Z/
Calhoun MI-Barry MI-
844 PM EDT Sun Jun 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR CALHOUN AND SOUTHERN BARRY COUNTIES...
At 843 PM EDT, severe thunderstorms were located along a line
extending from near Wayland to 7 miles northeast of Level Park-Oak
Park to near Marshall, moving northeast 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...
Albion... Hastings... Marshall...
Battle Creek... Homer... Burlington...
Brownlee Park... Level Park-Oak Park... Orangeville...
Marengo... Assyria... Tekonsha...
Delton... Banfield... Gun Lake...
Yankee Springs... Prairieville... Hickory Corners...
Dowling... Pine Lake...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
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 4208 8507 4242 8530 4242 8554 4248 8553
4267 8554 4263 8523 4250 8507 4242 8507
4242 8497 4221 8471 4207 8471
TIME...MOT...LOC 0043Z 233DEG 40KT 4264 8562 4246 8521 4227 8489
HAIL...1.00IN
WIND...60MPH
$$
04The office that day
Everything else NWS Grand Rapids, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 4:50 AM EDT | Small Craft Advisory | GRR | 45 hr | |
| Jun 20, 4:52 AM EDT | Beach Hazards Statement | GRR | Allegan, Mason, Muskegon, Oceana, Ottawa, Van Buren | 45 hr |
| Jun 20, 7:05 PM EDT | Severe Thunderstorm Warning | GRR | Van Buren | 55 min |
| Jun 20, 7:13 PM EDT | Special Marine Warning | GRR | 92 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.