Alert archive / Michigan / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 53, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this severe thunderstorm warning at Aug 11, 2021, 8:56 PM EDT for Allegan County, Barry County, Kent County, Michigan. It was in force for 49 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
- Aug 11, 2021, 8:56 PM EDT (00:56 UTC)
- Expired
- Aug 11, 2021, 9:45 PM EDT
- In force
- 49 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, Kent County, MI
The radar
The Grand Rapids radar (KGRR), 11 km from the middle of the area, began a volume at 00:57 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 |
|---|---|---|---|
| Aug 11, 9:05 PM EDT | TSTM WND DMG | 1 W Dorr, MI | ISOLATED SWATHS OF TREES DOWN ALONG 142ND AVE NEAR AND EAST OF 21ST ST. WAS A HALF-MILE SOUTH OF TORNADO PATH. |
| Aug 11, 9:07 PM EDT | TSTM WND DMG | Dorr, MI | SCATTERED TREE LIMBS SNAPPED OR TREES UPROOTED ACROSS WIDE SECTION OF DORR. VIEWER PHOTO TO BROADCAST MEDIA WITH WOOD-CONSTRUCTED BARN ON 140TH AVE THAT HAD TWO WALLS BLOWN IN. |
| Aug 11, 9:10 PM EDT | TSTM WND DMG | 2 Ene Dorr, MI | DRONE PHOTOS OF 40 PERCENT OF LARGE CORNFIELD FLATTENED IN MULTIPLE DIVERGENT OR FAN-OUT PATTERNS. 144TH AVE AND 14TH ST. |
| Aug 11, 9:10 PM EDT | TSTM WND DMG | 2 Nnw Wayland, MI | SEVERAL 12 TO 16 INCH DIAMETER TREES BROKEN IN HALF AT 12TH AND 138TH. ONE THAT FELL ON A HOUSE. |
| Aug 11, 9:10 PM EDT | TSTM WND DMG | 2 Nnw Wayland, MI | SEVERAL 12 TO 16 INCH DIAMETER TREES BROKEN IN HALF. ONE THAT FELL ON A HOUSE AT 12TH AND 138TH AVENUE. |
| Aug 11, 9:10 PM EDT | TSTM WND DMG | 2 Nw Wayland, MI | SWATH OF TREES AND WIRES DOWN A HALF-MILE SOUTH OF ANOTHER SWATH. SOME POWER POLES SNAPPED. FRONT PORCH WAS DAMAGED. 138TH AVE WEST OF 12TH ST. |
| Aug 11, 9:10 PM EDT | TSTM WND DMG | 3 Nw Wayland, MI | WOODLINE IN A FIELD WITH A DOZEN TREES SNAPPED. SOUTH OF 140TH BETWEEN 14TH AND 12TH ST. SEVERAL MORE TREES SNAPPED OR BLOWN OVER ALONG 12TH ST. |
| Aug 11, 9:12 PM EDT | TSTM WND DMG | 3 Nne Wayland, MI | 8 TOTAL LARGE TREES DOWN ON ONE PROPERTY. 6 TREES WERE UPROOTED. 140TH AVE EAST OF 9TH ST. |
| Aug 11, 9:14 PM EDT | TSTM WND DMG | Dorr, MI | DELAYED REPORT FROM MPING: 1-INCH TREE LIMBS BROKEN. |
| Aug 11, 9:49 PM EDT | TSTM WND DMG | 2 Ene Dorr, MI | DELAYED REPORT FROM MPING: 1-INCH TREE LIMBS BROKEN. |
| Aug 11, 9:54 PM EDT | TSTM WND DMG | 2 Nnw Wayland, MI | TREETOP LIMBS FELL AND PUNCTURED ROOF DURING GUST OF WIND. HOME SURVEILLANCE VIDEO CAPTURED EVENT AND TIME. RADAR CORROBORATES A MICROBURST COULD HAVE OCCURRED FROM ADDITIONAL STORMS 45 MINUTES AFTER THE FIRST LINE OF SEVERE STORMS. 12TH ST BETWEEN 138TH AND 1 |
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, 0.9 hours before the alert went out and 177 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
- 12 J/kg
- Mixed-layer CIN
- -458 J/kg
- Mixed-layer LCL
- 1474 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 243 m²/s²
- 0-3 km storm-relative helicity
- 373 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
001 WUUS53 KGRR 120056 SVRGRR MIC005-015-081-120145- /O.NEW.KGRR.SV.W.0053.210812T0056Z-210812T0145Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Grand Rapids MI 856 PM EDT Wed Aug 11 2021 The National Weather Service in Grand Rapids has issued a * Severe Thunderstorm Warning for... Northeastern Allegan County in southwestern Michigan... Southern Kent County in southwestern Michigan... Northwestern Barry County in southwestern Michigan... * Until 945 PM EDT. * At 855 PM EDT, severe thunderstorms were located along a line extending from near Jenison to 8 miles northeast of Fennville, moving east at 55 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Grand Rapids... Hastings... Wyoming... Kentwood... Walker... Grandville... Wayland... Middleville... Caledonia... Freeport... Dorr... Irving... Dutton... Cutlerville... Yankee Springs... Green Lake... Alto... Alaska... Byron Center... Cascade... PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4292 8578 4291 8531 4263 8531 4264 8578 TIME...MOT...LOC 0055Z 272DEG 47KT 4292 8585 4266 8596 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ MEADE
2 follow-up statements
105 WWUS53 KGRR 120110 SVSGRR Severe Weather Statement National Weather Service Grand Rapids MI 910 PM EDT Wed Aug 11 2021 MIC005-015-081-120145- /O.CON.KGRR.SV.W.0053.000000T0000Z-210812T0145Z/ Allegan MI-Kent MI-Barry MI- 910 PM EDT Wed Aug 11 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM EDT FOR NORTHEASTERN ALLEGAN...SOUTHERN KENT AND NORTHWESTERN BARRY COUNTIES... At 910 PM EDT, severe thunderstorms were located along a line extending from near Kentwood to Dorr, moving east at 55 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Grand Rapids... Hastings... Wyoming... Kentwood... Walker... Grandville... Wayland... Middleville... Caledonia... Freeport... Dorr... Irving... Dutton... Cutlerville... Yankee Springs... Green Lake... Alto... Alaska... Byron Center... Cascade... PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain alert for a possible tornado! Tornadoes can develop quickly from severe thunderstorms. If you spot a tornado go at once into the basement or small central room in a sturdy structure. For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4292 8578 4291 8531 4263 8531 4264 8578 TIME...MOT...LOC 0110Z 268DEG 48KT 4290 8563 4272 8572 TORNADO...POSSIBLE HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ CAS
959
WWUS53 KGRR 120144
SVSGRR
Severe Weather Statement
National Weather Service Grand Rapids MI
944 PM EDT Wed Aug 11 2021
MIC005-015-081-120152-
/O.EXP.KGRR.SV.W.0053.000000T0000Z-210812T0145Z/
Allegan MI-Kent MI-Barry MI-
944 PM EDT Wed Aug 11 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ALLEGAN...
SOUTHERN KENT AND NORTHWESTERN BARRY COUNTIES WILL EXPIRE AT 945 PM
EDT...
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire for Allegan, Kent,
and Northwest Barry Counties. However, gusty winds to 40 mph,
lightning, and heavy rain are still possible with these
thunderstorms.
A Severe Thunderstorm Warning continues for eastern Barry County
until 1015 PM EDT. A Severe Thunderstorm Watch remains in effect
until 300 AM EDT for south central and southwestern Michigan.
LAT...LON 4292 8578 4291 8531 4263 8531 4264 8578
TIME...MOT...LOC 0142Z 272DEG 47KT 4288 8509 4270 8518
$$
CASThe office that day
Everything else NWS Grand Rapids, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 8:19 PM EDT | Severe Thunderstorm Warning | GRR | Allegan, Ottawa | 72 min |
| Aug 11, 8:26 PM EDT | Special Marine Warning | GRR | 90 min | |
| Aug 11, 9:30 PM EDT | Severe Thunderstorm Warning | GRR | Barry, Clinton, Eaton, Ionia | 45 min |
| Aug 11, 10:40 PM EDT | Special Weather Statement | GRR | Calhoun, Jackson | 50 min |
| Aug 12, 12:01 AM EDT | Special Weather Statement | GRR | Allegan | 59 min |
| Aug 12, 12:32 AM EDT | Special Weather Statement | GRR | Kent | 28 min |
| Aug 12, 12:56 AM EDT | Areal Flood Advisory | GRR | Calhoun, Ingham, Jackson | 5 hr |
| Aug 12, 1:21 AM EDT | Areal Flood Advisory | GRR | Clinton, Eaton, Ingham | 2 hr |
| Aug 12, 3:38 AM EDT | Areal Flood Warning | GRR | Clinton, Eaton, Ingham | 5 hr |
| Aug 12, 4:39 AM EDT | Special Weather Statement | GRR | Eaton, Ingham | 66 min |
| Aug 12, 6:09 AM EDT | Special Weather Statement | GRR | Calhoun | 66 min |
| Aug 12, 6:15 AM EDT | Severe Thunderstorm Warning | GRR | Calhoun, Jackson | 45 min |
| Aug 12, 6:23 AM EDT | Areal Flood Warning | GRR | Calhoun, Ingham, Jackson | 4 hr |
| Aug 12, 8:39 AM EDT | Areal Flood Advisory | GRR | Clinton, Eaton, Ingham | 111 min |
| Aug 12, 10:30 AM EDT | Areal Flood Advisory | GRR | Calhoun, Ingham, Jackson | 2 hr |
| Aug 12, 11:06 AM EDT | River Flood Warning | GRR | Ingham | 36 hr |
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.