Alert archive / Michigan / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 55, NWS Grand Rapids, MI

July 19, 2020Van Buren County, Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at Jul 19, 2020, 1:34 PM EDT for Van Buren County, Michigan. It was in force for 40 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: Jul 19, 2020, 1:34 PM EDT (17:34 UTC)
Expired: Jul 19, 2020, 2:14 PM EDT
In force: 40 min
Issued by: NWS Grand Rapids, MI
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Van Buren County, MI

The radar

The Grand Rapids radar (KGRR), 92 km from the middle of the area, began a volume at 17:39 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, 5.6 hours before the alert went out and 241 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: 1433 J/kg
Mixed-layer CIN: -109 J/kg
Mixed-layer LCL: 988 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 149 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.8

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 Jul 19, 1:24 PM EDT, 10 minutes earlier.

Area forecast discussion, Jul 19, 1:24 PM EDT, 10 minutes before

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Hazardous weather outlook, Jul 19, 11:25 AM EDT, 2 hours 9 minutes before

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In the hours before

Local storm report, Jul 19, 9:06 AM EDT, 4 hours 28 minutes before

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Local storm report, Jul 19, 9:10 AM EDT, 4 hours 24 minutes before

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Local storm report, Jul 19, 9:21 AM EDT, 4 hours 13 minutes before

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Local storm report, Jul 19, 9:22 AM EDT, 4 hours 12 minutes before

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Local storm report, Jul 19, 11:46 AM EDT, 1 hour 48 minutes before

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Special weather statement, Jul 19, 12:03 PM EDT, 1 hour 31 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
Jul 19, 6:42 AM EDT	Special Marine Warning	GRR		19 min
Jul 19, 6:52 AM EDT	Special Marine Warning	GRR		45 min
Jul 19, 6:56 AM EDT	Special Marine Warning	GRR		64 min
Jul 19, 7:07 AM EDT	Severe Thunderstorm Warning	GRR	Mason	39 min
Jul 19, 7:49 AM EDT	Special Marine Warning	GRR		61 min
Jul 19, 8:25 AM EDT	Severe Thunderstorm Warning	GRR	Isabella, Mecosta	44 min
Jul 19, 8:54 AM EDT	Severe Thunderstorm Warning	GRR	Gratiot	51 min
Jul 19, 11:44 AM EDT	Severe Thunderstorm Warning	GRR	Calhoun	20 min
Jul 19, 12:03 PM EDT	Special Weather Statement	GRR	Allegan, Barry, Calhoun, Eaton, Ingham, Jackson and 2 more	57 min
Jul 19, 12:58 PM EDT	Special Marine Warning	GRR		62 min

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.