Alert archive / Michigan / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 62, NWS Grand Rapids, MI

August 25, 2020Muskegon County, Newaygo County, Oceana County, Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at Aug 25, 2020, 10:38 AM EDT for Muskegon County, Newaygo County, Oceana County, Michigan. It was in force for 37 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 25, 2020, 10:38 AM EDT (14:38 UTC)
Expired: Aug 25, 2020, 11:15 AM EDT
In force: 37 min
Issued by: NWS Grand Rapids, MI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Muskegon County, MI, Newaygo County, MI, Oceana County, MI

The radar

The Grand Rapids radar (KGRR), 80 km from the middle of the area, began a volume at 14:42 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

Green Bay/Straub, WI (KGRB), launched 12:00Z, 2.6 hours before the alert went out and 194 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: 1203 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: -74 m²/s²
0-3 km storm-relative helicity: 56 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 25, 7:16 AM EDT, 3 hours 22 minutes earlier.

Area forecast discussion, Aug 25, 7:16 AM EDT, 3 hours 22 minutes before

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Hazardous weather outlook, Aug 25, 3:49 AM EDT, 6 hours 49 minutes before

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In the hours before

Local storm report, Aug 25, 7:57 AM EDT, 2 hours 41 minutes before

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Special weather statement, Aug 25, 10:27 AM EDT, 11 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 25, 7:08 AM EDT	Special Marine Warning	GRR		67 min
Aug 25, 7:48 AM EDT	Special Marine Warning	GRR		42 min
Aug 25, 7:48 AM EDT	Special Marine Warning	GRR		42 min
Aug 25, 10:27 AM EDT	Special Weather Statement	GRR	Muskegon, Oceana	63 min
Aug 25, 11:00 AM EDT	Special Marine Warning	GRR		60 min
Aug 25, 11:35 AM EDT	Special Marine Warning	GRR		85 min
Aug 25, 12:54 PM EDT	Special Marine Warning	GRR		66 min
Aug 25, 3:42 PM EDT	Small Craft Advisory	GRR		46 hr

Nearby

Severe Thunderstorm Warnings in Michigan, 2020 Every severe thunderstorm warning in 2020

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.