Alert archive / Michigan / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 20, NWS Grand Rapids, MI

May 2, 20084 counties in Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at May 2, 2008, 12:48 PM EDT for 4 counties in Michigan. It was in force for 18 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: May 2, 2008, 12:48 PM EDT (16:48 UTC)
Expired: May 2, 2008, 1:06 PM EDT
In force: 18 min
Issued by: NWS Grand Rapids, MI
Area: Storm-based polygon

Counties Barry County, MI, Calhoun County, MI, Eaton County, MI, Kalamazoo County, MI

The radar

The Grand Rapids radar (KGRR), 61 km from the middle of the area, began a volume at 16:50 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, 4.8 hours before the alert went out and 146 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: 922 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 208 m²/s²
0-3 km storm-relative helicity: 219 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 May 2, 12:08 PM EDT, 40 minutes earlier.

Area forecast discussion, May 2, 12:08 PM EDT, 40 minutes before

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Hazardous weather outlook, May 2, 12:17 PM EDT, 31 minutes before

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In the hours before

Special weather statement, May 2, 11:00 AM EDT, 1 hour 48 minutes before

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Special weather statement, May 2, 12:03 PM EDT, 45 minutes before

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Special weather statement, May 2, 12:37 PM EDT, 11 minutes before

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Local storm report, May 2, 12:45 PM EDT, 3 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
May 2, 11:00 AM EDT	Special Weather Statement	GRR	Kalamazoo	60 min
May 2, 12:03 PM EDT	Special Weather Statement	GRR	Calhoun, Ingham, Jackson	87 min
May 2, 12:12 PM EDT	Special Marine Warning	GRR		63 min
May 2, 12:37 PM EDT	Special Weather Statement	GRR	Allegan, Ottawa	38 min
May 2, 2:38 PM EDT	Special Weather Statement	GRR	Clinton, Eaton, Gratiot, Ingham, Ionia, Isabella and 3 more	97 min
May 2, 3:34 PM EDT	Special Weather Statement	GRR	Clare, Isabella	56 min
May 2, 4:30 PM EDT	Special Weather Statement	GRR	Clare, Gratiot, Ionia, Isabella, Lake, Mason and 4 more	90 min
May 2, 5:18 PM EDT	Special Weather Statement	GRR	Clare, Isabella, Mecosta, Osceola	57 min

Nearby

Severe Thunderstorm Warnings in Michigan, 2008 Every severe thunderstorm warning in 2008

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.