Alert archive / Michigan / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 43, NWS Grand Rapids, MI

August 10, 20215 counties in Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at Aug 10, 2021, 10:02 PM EDT for 5 counties in Michigan. It was in force for 58 min. 19 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 10, 2021, 10:02 PM EDT (02:02 UTC)
Expired
Aug 10, 2021, 11:00 PM EDT
In force
58 min
Issued by
NWS Grand Rapids, MI
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Barry County, MI, Kalamazoo County, MI, Kent County, MI, Lake County, MI, Newaygo County, MI

The radar

The Grand Rapids radar (KGRR), 5 km from the middle of the area, began a volume at 02:01 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

TimeReportWhereRemark
Aug 10, 10:26 PM EDTTSTM WND GST 541 Sse Reeman, MIAWOS STATION KFFX FREMONT MUNICIPAL ARPT.
Aug 10, 10:30 PM EDTTSTM WND GST 401 Sse Kentwood, MI2-4 INCH LIMBS DOWN.
Aug 10, 10:30 PM EDTTSTM WND GST 503 Nnw Grand Rapids, MISIGNS BLOWN ACROSS HIGHWAY...2-4 INCH LIMBS BLOWN ACROSS HIGHWAY.
Aug 10, 10:30 PM EDTTSTM WND GST 601 Ne Wyoming, MI
Aug 10, 10:32 PM EDTTSTM WND DMGWalker, MIREPORT FROM MPING. TREES UPROOTED OR SNAPPED.
Aug 10, 10:35 PM EDTTSTM WND GST 503 S Comstock Park, MI2-6 INCH LIMBS DOWN.
Aug 10, 10:35 PM EDTTSTM WND GST 50Kentwood, MIPOWER OUT.
Aug 10, 10:40 PM EDTTSTM WND GST 56East Grand Rapids, MI
Aug 10, 10:43 PM EDTTSTM WND GST 463 Wnw Rockford, MILIMBS AND BRANCHES DOWN.
Aug 10, 10:44 PM EDTTSTM WND GST 45Kentwood, MI
Aug 10, 10:45 PM EDTTSTM WND DMG1 E Alaska, MISEVERAL TREES SNAPPED OR UPROOTED NEAR 68TH AVE BETWEEN ALASKA AVE AND WHITNEYVILLE AVE.
Aug 10, 10:45 PM EDTTSTM WND DMG3 Nnw Caledonia, MISEVERAL UPROOTED TREES AT KRAFT AVE SE & 76TH ST SE.
Aug 10, 10:45 PM EDTTSTM WND DMGRockford, MIABOUT A DOZEN TREES FELL ON ONE PROPERTY. ONE TREE FELL ON HOUSE AND BROKE NATURAL GAS LINE. A WILLOW TREE ELSEWHERE FELL ON A CAR DRIVING DOWN BLAKELY DR.
Aug 10, 10:45 PM EDTTSTM WND GST 482 Wnw Ada, MI
Aug 10, 10:45 PM EDTTSTM WND GST 622 Ssw Cascade, MIASOS STATION KGRR GERALD R FORD INTL.
Aug 10, 10:48 PM EDTTSTM WND DMG1 E Cascade, MISEVERAL DOWNED TREES. ONE TREE DOWN ON A GARAGE. TREE DEBRIS IS DOWN OVER 30TH STREET OVER TO BUTTRICK AVE.
Aug 10, 10:49 PM EDTTSTM WND GST 583 W Lowell, MILARGE TREE UPROOTED. POWER LINES DOWN ON M-21 IN LOWELL. 58MPH WIND GUST REPORTED ON LOCAL WX STATION.
Aug 10, 10:52 PM EDTTSTM WND DMG1 Nne Lowell, MI2 FOOT DIAMETER TREE DOWN ON HOUSE. MONROE AND SHERMAN STREET.
Aug 10, 10:59 PM EDTTSTM WND GST 506 W Greenville, MI

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.

IssuedProductOfficeLasted
Aug 10, 8:38 PM EDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Detroit, MI (KDTX), launched 00:00Z, 2.0 hours before the alert went out and 174 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.

Skew-T log-pSkew-T log-p diagram, Detroit, MI at 00:00Z on 2021-08-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2462 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Detroit, MI at 00:00Z on 2021-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
2462 J/kg
Mixed-layer CIN
-27 J/kg
Mixed-layer LCL
962 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
207 m²/s²
Significant tornado parameter
0.7
Supercell composite
3.7

Open this sounding in Storm Lab

The text

As transmitted.

182 
WUUS53 KGRR 110202
SVRGRR
MIC015-077-081-085-123-110300-
/O.NEW.KGRR.SV.W.0043.210811T0202Z-210811T0300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Rapids MI
1002 PM EDT Tue Aug 10 2021

The National Weather Service in Grand Rapids has issued a

* Severe Thunderstorm Warning for...
  Kent County in southwestern Michigan...
  Newaygo County in west central Michigan...
  Barry County in southwestern Michigan...
  Lake County in west central Michigan...
  Kalamazoo County in southwestern Michigan...

* Until 1100 PM EDT.

* At 1002 PM EDT, severe thunderstorms were located along a line
  extending from 6 miles west of Manistee to near Fruitport to near
  Fennville to near Coloma, 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...        Kalamazoo...           Portage...
  Hastings...            Lowell...              Newaygo...
  White Cloud...         Baldwin...             Wyoming...
  Kentwood...            Walker...              Grandville...
  East Grand Rapids...   Rockford...            Sparta...
  Fremont...             Middleville...         Vicksburg...
  Galesburg...           Nashville...           

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4208 8575 4240 8573 4242 8554 4277 8554
      4279 8576 4329 8578 4330 8602 4416 8604
      4416 8556 4330 8556 4329 8532 4278 8532
      4276 8507 4243 8508 4242 8530 4207 8530
TIME...MOT...LOC 0202Z 273DEG 48KT 4427 8645 4311 8612 4265 8606 4212
8630

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

04
1 follow-up statement
200 
WWUS53 KGRR 110258
SVSGRR

Severe Weather Statement
National Weather Service Grand Rapids MI
1058 PM EDT Tue Aug 10 2021

MIC015-077-081-085-123-110308-
/O.EXP.KGRR.SV.W.0043.000000T0000Z-210811T0300Z/
Kent MI-Newaygo MI-Barry MI-Lake MI-Kalamazoo MI-
1058 PM EDT Tue Aug 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR KENT...NEWAYGO...BARRY...LAKE
AND KALAMAZOO COUNTIES WILL EXPIRE AT 1100 PM EDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 300 AM EDT for
south central, central, southwestern and west central Michigan.

LAT...LON 4208 8575 4240 8573 4242 8554 4277 8554
      4279 8576 4329 8578 4330 8602 4416 8604
      4416 8556 4330 8556 4329 8532 4278 8532
      4276 8507 4243 8508 4242 8530 4207 8530
TIME...MOT...LOC 0258Z 270DEG 48KT 4423 8545 4307 8514 4261 8509 4208
8533

$$

04

The office that day

Everything else NWS Grand Rapids, MI issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 10, 8:46 PM EDTSpecial Marine WarningGRR59 min
Aug 10, 9:22 PM EDTSpecial Weather StatementGRRAllegan, Barry, Calhoun, Clare, Clinton, Eaton and 16 more3 hr
Aug 10, 9:40 PM EDTSevere Thunderstorm WarningGRRAllegan, Mason, Muskegon, Oceana, Ottawa, Van Buren73 min
Aug 10, 10:41 PM EDTSevere Thunderstorm WarningGRRCalhoun, Eaton, Ionia, Mecosta, Montcalm, Osceola64 min
Aug 10, 11:09 PM EDTSevere Thunderstorm WarningGRRClare, Clinton, Gratiot, Ingham, Isabella, Jackson66 min
Aug 11, 11:45 AM EDTSpecial Marine WarningGRR90 min
Aug 11, 12:40 PM EDTSpecial Weather StatementGRRKent65 min
Aug 11, 12:51 PM EDTSevere Thunderstorm WarningGRRAllegan, Ottawa28 min
Aug 11, 1:07 PM EDTSpecial Weather StatementGRRKent83 min
Aug 11, 1:28 PM EDTSpecial Weather StatementGRRCalhoun, Kalamazoo62 min
Aug 11, 1:39 PM EDTSpecial Weather StatementGRRClinton, Eaton, Gratiot, Ingham, Ionia, Jackson and 1 more2 hr
Aug 11, 1:56 PM EDTSevere Thunderstorm WarningGRRCalhoun38 min
Aug 11, 2:08 PM EDTSevere Thunderstorm WarningGRRJackson58 min
Aug 11, 2:11 PM EDTSevere Thunderstorm WarningGRRClinton, Gratiot, Ionia, Montcalm49 min
Aug 11, 2:38 PM EDTSevere Thunderstorm WarningGRRIngham34 min
Aug 11, 6:26 PM EDTSpecial Marine WarningGRR2 hr
Aug 11, 7:32 PM EDTSevere Thunderstorm WarningGRRMuskegon43 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.