Alert archive / Michigan / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 25, NWS Northern Indiana

June 20, 2021Hillsdale County, Michigan

NWS Northern Indiana issued this severe thunderstorm warning at Jun 20, 2021, 7:49 PM EDT for Hillsdale County, Michigan. It was in force for 26 min. 1 report 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, 7:49 PM EDT (23:49 UTC)
Expired: Jun 20, 2021, 8:15 PM EDT
In force: 26 min
Issued by: NWS Northern Indiana
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Hillsdale County, MI

The radar

The Northern Indiana radar (KIWX), 119 km from the middle of the area, began a volume at 23:52 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, 7:54 PM EDT	TSTM WND DMG	3 E Pittsford, MI	3 TREES DOWNED ACROSS SE HALF OF COUNTY.

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, 11.8 hours before the alert went out and 127 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: 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

Open this sounding in Storm Lab

The text

As transmitted.

287 
WUUS53 KIWX 202349
SVRIWX
MIC059-210015-
/O.NEW.KIWX.SV.W.0025.210620T2349Z-210621T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Northern Indiana
749 PM EDT Sun Jun 20 2021

The National Weather Service in Northern Indiana has issued a

* Severe Thunderstorm Warning for...
  Eastern Hillsdale County in southeastern Michigan...

* Until 815 PM EDT.

* At 749 PM EDT, a severe thunderstorm was located near Hudson,
  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...
  Somerset, Pittsford, Ransom, Waldron, Prattville, Shadyside,
  Betzer, Osseo, Somerset Center and Frontier.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4171 8436 4170 8442 4179 8462 4207 8441
      4207 8437
TIME...MOT...LOC 2349Z 212DEG 30KT 4181 8446 

HAIL...1.00IN
WIND...60MPH
 
$$

Brown

1 follow-up statement

550 
WWUS53 KIWX 210009
SVSIWX

Severe Weather Statement
National Weather Service Northern Indiana
809 PM EDT Sun Jun 20 2021

MIC059-210019-
/O.EXP.KIWX.SV.W.0025.000000T0000Z-210621T0015Z/
Hillsdale MI-
809 PM EDT Sun Jun 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN HILLSDALE COUNTY WILL
EXPIRE AT 815 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However heavy rain
is still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 100 AM EDT for
southeastern Michigan...and northwestern Ohio.

LAT...LON 4171 8436 4170 8442 4179 8462 4207 8441
      4207 8437
TIME...MOT...LOC 0009Z 270DEG 30KT 4178 8424 

$$

Brown

The office that day

Everything else NWS Northern Indiana issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 19, 8:20 PM EDT	Severe Thunderstorm Warning	IWX	Cass, Saint Joseph	40 min
Jun 19, 8:51 PM EDT	Areal Flood Advisory	IWX	Cass, Saint Joseph	3 hr
Jun 19, 9:21 PM EDT	Severe Thunderstorm Warning	IWX	Branch, Hillsdale	39 min
Jun 19, 9:59 PM EDT	Severe Thunderstorm Warning	IWX	Hillsdale	17 min
Jun 20, 5:12 AM EDT	Beach Hazards Statement	IWX		49 hr
Jun 20, 6:42 PM EDT	Severe Thunderstorm Warning	IWX	Cass	26 min
Jun 20, 6:58 PM EDT	Severe Thunderstorm Warning	IWX	Berrien, Cass	28 min
Jun 20, 7:19 PM EDT	Severe Thunderstorm Warning	IWX	Saint Joseph	41 min
Jun 20, 7:29 PM EDT	Severe Thunderstorm Warning	IWX	Hillsdale	31 min
Jun 20, 7:58 PM EDT	Severe Thunderstorm Warning	IWX	Branch, Saint Joseph	32 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.