Alert archive / Michigan / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 57, NWS Grand Rapids, MI

August 27, 2013Clare County, Osceola County, Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at Aug 27, 2013, 4:53 PM EDT for Clare County, Osceola 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 27, 2013, 4:53 PM EDT (20:53 UTC)
Expired: Aug 27, 2013, 5:30 PM EDT
In force: 37 min
Issued by: NWS Grand Rapids, MI
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Clare County, MI, Osceola County, MI

The radar

The NCL Michigan radar (KAPX), 106 km from the middle of the area, began a volume at 20:55 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 27, 4:52 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 8.9 hours before the alert went out and 246 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: 1691 J/kg
Mixed-layer CIN: -101 J/kg
Mixed-layer LCL: 599 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 196 m²/s²
0-3 km storm-relative helicity: 190 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 9.3

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 27, 3:58 PM EDT, 55 minutes earlier.

Area forecast discussion, Aug 27, 3:58 PM EDT, 55 minutes before

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Hazardous weather outlook, Aug 27, 10:20 AM EDT, 6 hours 33 minutes before

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In the hours before

Local storm report, Aug 27, 11:43 AM EDT, 5 hours 10 minutes before

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Local storm report, Aug 27, 11:57 AM EDT, 4 hours 56 minutes before

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Special weather statement, Aug 27, 4:37 PM EDT, 16 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 27, 3:52 AM EDT	Special Weather Statement	GRR	Lake, Mason, Newaygo, Oceana	53 min
Aug 27, 4:18 AM EDT	Special Weather Statement	GRR	Clare, Clinton, Gratiot, Isabella, Mecosta, Montcalm and 2 more	57 min
Aug 27, 5:59 AM EDT	Special Weather Statement	GRR	Ingham	61 min
Aug 27, 5:02 PM EDT	Areal Flood Advisory	GRR	Clare, Osceola	6 hr

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.