Alert archive / Michigan / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 40, NWS Grand Rapids, MI

July 20, 2019Lake County, Osceola County, Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at Jul 20, 2019, 7:52 AM EDT for Lake County, Osceola County, Michigan. It was in force for 53 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 20, 2019, 7:52 AM EDT (11:52 UTC)
Expired: Jul 20, 2019, 8:45 AM EDT
In force: 53 min
Issued by: NWS Grand Rapids, MI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Lake County, MI, Osceola County, MI

The radar

The Grand Rapids radar (KGRR), 122 km from the middle of the area, began a volume at 11:55 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 00:00Z, 11.9 hours before the alert went out and 209 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: 2503 J/kg
Mixed-layer CIN: -76 J/kg
Mixed-layer LCL: 1199 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 218 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.7

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 20, 7:47 AM EDT, 5 minutes earlier.

Area forecast discussion, Jul 20, 7:47 AM EDT, 5 minutes before

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Hazardous weather outlook, Jul 20, 5:42 AM EDT, 2 hours 10 minutes before

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In the hours before

Local storm report, Jul 20, 4:22 AM EDT, 3 hours 30 minutes before

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Local storm report, Jul 20, 4:24 AM EDT, 3 hours 28 minutes before

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Local storm report, Jul 20, 4:26 AM EDT, 3 hours 26 minutes before

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Local storm report, Jul 20, 5:56 AM EDT, 1 hour 56 minutes before

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Local storm report, Jul 20, 6:15 AM EDT, 1 hour 37 minutes before

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Local storm report, Jul 20, 6:54 AM EDT, 58 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, 11:30 PM EDT	Special Marine Warning	GRR		2 hr
Jul 19, 11:49 PM EDT	Severe Thunderstorm Warning	GRR	Mason	56 min
Jul 20, 12:15 AM EDT	Severe Thunderstorm Warning	GRR	Oceana	60 min
Jul 20, 12:23 AM EDT	Severe Thunderstorm Warning	GRR	Lake	46 min
Jul 20, 12:28 AM EDT	Special Marine Warning	GRR		92 min
Jul 20, 12:39 AM EDT	Severe Thunderstorm Warning	GRR	Newaygo	66 min
Jul 20, 12:48 AM EDT	Severe Thunderstorm Warning	GRR	Muskegon	57 min
Jul 20, 1:08 AM EDT	Special Weather Statement	GRR	Clare, Clinton, Gratiot, Ionia, Isabella, Kent and 4 more	82 min
Jul 20, 1:24 AM EDT	Severe Thunderstorm Warning	GRR	Kent, Ottawa	51 min
Jul 20, 1:42 AM EDT	Severe Thunderstorm Warning	GRR	Allegan, Barry	63 min
Jul 20, 1:45 AM EDT	Severe Thunderstorm Warning	GRR	Ionia	60 min
Jul 20, 2:05 AM EDT	Severe Thunderstorm Warning	GRR	Calhoun, Eaton, Kalamazoo, Van Buren	85 min
Jul 20, 2:21 AM EDT	Special Marine Warning	GRR		54 min
Jul 20, 2:28 AM EDT	Special Weather Statement	GRR	Clinton, Ingham, Jackson	92 min
Jul 20, 8:58 AM EDT	Areal Flood Advisory	GRR	Lake, Mason	2 hr
Jul 20, 10:54 AM EDT	Areal Flood Warning	GRR	Lake, Mason	36 hr
Jul 20, 10:58 AM EDT	Severe Thunderstorm Warning	GRR	Mecosta, Newaygo	47 min
Jul 20, 11:15 AM EDT	Areal Flood Advisory	GRR	Mecosta, Osceola	23 hr
Jul 20, 12:58 PM EDT	Special Marine Warning	GRR		92 min
Jul 20, 1:37 PM EDT	Special Marine Warning	GRR		113 min
Jul 20, 1:45 PM EDT	Severe Thunderstorm Warning	GRR	Mason	60 min
Jul 20, 2:07 PM EDT	Severe Thunderstorm Warning	GRR	Oceana	53 min
Jul 20, 2:08 PM EDT	Areal Flood Advisory	GRR	Newaygo	7 hr
Jul 20, 2:33 PM EDT	Severe Thunderstorm Warning	GRR	Muskegon	57 min
Jul 20, 2:34 PM EDT	Special Marine Warning	GRR		56 min
Jul 20, 2:46 PM EDT	Severe Thunderstorm Warning	GRR	Newaygo	59 min
Jul 20, 3:11 PM EDT	Severe Thunderstorm Warning	GRR	Ottawa	49 min
Jul 20, 3:11 PM EDT	Severe Thunderstorm Warning	GRR	Lake, Mecosta, Osceola	64 min
Jul 20, 3:15 PM EDT	Special Marine Warning	GRR		60 min
Jul 20, 3:23 PM EDT	Special Marine Warning	GRR		52 min
Jul 20, 4:13 PM EDT	Special Marine Warning	GRR		92 min
Jul 20, 5:36 PM EDT	Special Weather Statement	GRR	Allegan, Barry, Calhoun, Eaton, Ingham, Jackson and 2 more	84 min
Jul 20, 5:54 PM EDT	Special Marine Warning	GRR		111 min

Nearby

Severe Thunderstorm Warnings in Michigan, 2019 Every severe thunderstorm warning in 2019

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.