Alert archive / Michigan / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 69, NWS Grand Rapids, MI

August 11, 2023Mecosta County, Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at Aug 11, 2023, 4:39 PM EDT for Mecosta County, Michigan. It was in force for 50 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 11, 2023, 4:39 PM EDT (20:39 UTC)
Expired: Aug 11, 2023, 5:29 PM EDT
In force: 50 min
Issued by: NWS Grand Rapids, MI
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

County Mecosta County, MI

The radar

The Grand Rapids radar (KGRR), 85 km from the middle of the area, began a volume at 20:39 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.

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 8.7 hours before the alert went out and 185 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1460 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 67 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Grand Rapids, MI wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 11, 3:47 PM EDT, 52 minutes earlier.

Area forecast discussion, Aug 11, 3:47 PM EDT, 52 minutes before

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Hazardous weather outlook, Aug 11, 3:50 AM EDT, 12 hours 49 minutes before

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In the hours before

Local storm report, Aug 11, 1:54 PM EDT, 2 hours 45 minutes before

Preliminary Local Storm Report
National Weather Service Grand Rapids MI
154 PM EDT Fri Aug 11 2023

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1237 PM     Rain             2 NE Ludington          43.98N 86.42W
08/11/2023  M1.07 inch       Mason              MI   Cocorahs

            CoCoRaHs observer reports heavy rainfall
            lasting for 39 minutes.

&&

Thomas

Local storm report, Aug 11, 2:24 PM EDT, 2 hours 15 minutes before

Preliminary Local Storm Report
National Weather Service Grand Rapids MI
224 PM EDT Fri Aug 11 2023

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0152 PM     Rain             6 NNE Ludington         44.03N 86.41W
08/11/2023  M1.08 inch       Mason              MI   Mesonet

            CWOP Station EW3852 reports rain with a
            duration of 1 hour and 15 minutes.

&&

Vernon/Thomas

Local storm report, Aug 11, 2:38 PM EDT, 2 hours 1 minute before

Preliminary Local Storm Report
National Weather Service Grand Rapids MI
238 PM EDT Fri Aug 11 2023

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0232 PM     Hail             1 ENE Alma              43.39N 84.63W
08/11/2023  E0.25 inch       Gratiot            MI   Trained Spotter

&&

Thomas

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 5:41 PM EDT	Special Weather Statement	GRR	Gratiot	94 min
Aug 11, 6:43 PM EDT	Special Weather Statement	GRR	Ingham	92 min
Aug 11, 7:42 PM EDT	Tornado Warning	GRR	Jackson	22 min

Nearby

Severe Thunderstorm Warnings in Michigan, 2023 Every severe thunderstorm warning in 2023

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.