Alert archive / Michigan / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 56, NWS Grand Rapids, MI

August 7, 2013Calhoun County, Kalamazoo County, Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at Aug 7, 2013, 8:42 AM EDT for Calhoun County, Kalamazoo County, Michigan. It was in force for 63 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 7, 2013, 8:42 AM EDT (12:42 UTC)
Expired: Aug 7, 2013, 9:45 AM EDT
In force: 63 min
Issued by: NWS Grand Rapids, MI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Calhoun County, MI, Kalamazoo County, MI

The radar

The Grand Rapids radar (KGRR), 76 km from the middle of the area, began a volume at 12:45 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, 0.7 hours before the alert went out and 160 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: 1279 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 572 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 43 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.6

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 7, 7:25 AM EDT, 1 hour 17 minutes earlier.

Area forecast discussion, Aug 7, 7:25 AM EDT, 1 hour 17 minutes before

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Hazardous weather outlook, Aug 7, 5:50 AM EDT, 2 hours 52 minutes before

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In the hours before

Local storm report, Aug 7, 3:53 AM EDT, 4 hours 49 minutes before

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Local storm report, Aug 7, 3:57 AM EDT, 4 hours 45 minutes before

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Local storm report, Aug 7, 4:00 AM EDT, 4 hours 42 minutes before

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Local storm report, Aug 7, 7:38 AM EDT, 1 hour 4 minutes before

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Local storm report, Aug 7, 8:15 AM EDT, 27 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 7, 2:21 AM EDT	Special Marine Warning	GRR		114 min
Aug 7, 2:28 AM EDT	Special Weather Statement	GRR	Lake, Mason, Newaygo, Oceana	2 hr
Aug 7, 2:51 AM EDT	Severe Thunderstorm Warning	GRR	Mason, Oceana	54 min
Aug 7, 3:20 AM EDT	Severe Thunderstorm Warning	GRR	Lake, Mecosta	55 min
Aug 7, 8:06 AM EDT	Special Marine Warning	GRR		54 min
Aug 7, 8:16 AM EDT	Severe Thunderstorm Warning	GRR	Van Buren	59 min
Aug 7, 8:46 AM EDT	Areal Flood Advisory	GRR	Van Buren	4 hr
Aug 7, 1:28 PM EDT	Special Weather Statement	GRR	Barry, Eaton	62 min
Aug 7, 2:35 PM EDT	Special Weather Statement	GRR	Eaton	55 min

Nearby

Severe Thunderstorm Warnings in Michigan, 2013 Every severe thunderstorm warning in 2013

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.