Alert archive / Michigan / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 31, NWS Grand Rapids, MI

July 7, 2021Calhoun County, Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at Jul 7, 2021, 5:06 PM EDT for Calhoun County, Michigan. It was in force for 24 min. 3 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 7, 2021, 5:06 PM EDT (21:06 UTC)
Expired: Jul 7, 2021, 5:30 PM EDT
In force: 24 min
Issued by: NWS Grand Rapids, MI
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Calhoun County, MI

The radar

The Grand Rapids radar (KGRR), 71 km from the middle of the area, began a volume at 21:09 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 7, 5:10 PM EDT	HAIL 0.7	1 W Springfield, MI
Jul 7, 5:12 PM EDT	TSTM WND DMG	Springfield, MI	TREES DOWN. TABLE UMBRELLA ALSO BROKE.
Jul 7, 5:13 PM EDT	TSTM WND GST 69	2 Ssw Springfield, MI	BATTLE CREEK EXECUTIVE 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 7, 1:31 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 9.1 hours before the alert went out and 150 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1092 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 779 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 123 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

As transmitted.

103 
WUUS53 KGRR 072106
SVRGRR
MIC025-072130-
/O.NEW.KGRR.SV.W.0031.210707T2106Z-210707T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Grand Rapids MI
506 PM EDT Wed Jul 7 2021

The National Weather Service in Grand Rapids has issued a

* Severe Thunderstorm Warning for...
  Northwestern Calhoun County in south central Michigan...

* Until 530 PM EDT.

* At 506 PM EDT, a severe thunderstorm was located over Battle Creek,
  moving northeast at 30 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Battle Creek...        Level Park-Oak Park... Brownlee Park...
  Bedford...             Ceresco...             

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4224 8529 4241 8530 4242 8502 4225 8499
TIME...MOT...LOC 2106Z 244DEG 25KT 4233 8523 

HAIL...<.75IN
WIND...60MPH
 
$$

MWS

1 follow-up statement

210 
WWUS53 KGRR 072127
SVSGRR

Severe Weather Statement
National Weather Service Grand Rapids MI
527 PM EDT Wed Jul 7 2021

MIC025-072137-
/O.EXP.KGRR.SV.W.0031.000000T0000Z-210707T2130Z/
Calhoun MI-
527 PM EDT Wed Jul 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CALHOUN COUNTY
WILL EXPIRE AT 530 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However, gusty
winds are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 900 PM EDT for
south central and southwestern Michigan.

LAT...LON 4224 8529 4241 8530 4242 8502 4225 8499
TIME...MOT...LOC 2127Z 244DEG 25KT 4239 8506 

$$

MWS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 8:28 PM EDT	Areal Flood Warning	GRR	Mecosta, Newaygo	6 hr
Jul 6, 9:21 PM EDT	Special Weather Statement	GRR	Clare, Isabella, Mecosta, Montcalm, Osceola	54 min
Jul 7, 12:13 PM EDT	Special Weather Statement	GRR	Allegan, Barry, Calhoun, Clinton, Eaton, Gratiot and 11 more	4 hr
Jul 7, 12:54 PM EDT	Severe Thunderstorm Warning	GRR	Clinton, Gratiot	66 min
Jul 7, 1:18 PM EDT	Tornado Warning	GRR	Clinton, Gratiot	27 min
Jul 7, 1:45 PM EDT	Severe Thunderstorm Warning	GRR	Clinton	13 min
Jul 7, 2:37 PM EDT	Severe Thunderstorm Warning	GRR	Calhoun, Jackson	38 min
Jul 7, 2:59 PM EDT	Severe Thunderstorm Warning	GRR	Calhoun, Eaton, Ingham, Jackson	77 min
Jul 7, 4:01 PM EDT	Special Weather Statement	GRR	Clare, Lake, Osceola	119 min
Jul 7, 4:15 PM EDT	Areal Flood Advisory	GRR	Calhoun	2 hr
Jul 7, 5:12 PM EDT	Special Weather Statement	GRR	Calhoun, Eaton, Ingham, Jackson	2 hr
Jul 7, 5:18 PM EDT	Severe Thunderstorm Warning	GRR	Ingham	27 min
Jul 7, 5:33 PM EDT	Areal Flood Advisory	GRR	Lake, Osceola	4 hr
Jul 7, 6:03 PM EDT	Special Weather Statement	GRR	Clare, Lake, Osceola	117 min
Jul 7, 6:17 PM EDT	Special Weather Statement	GRR	Clinton	58 min
Jul 7, 6:44 PM EDT	Special Weather Statement	GRR	Barry	31 min

Nearby

Severe Thunderstorm Warnings in Michigan, 2021 Every 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.