Alert archive / Michigan / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 18, NWS Grand Rapids, MI

April 25, 2008Lake County, Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at Apr 25, 2008, 9:47 PM EDT for Lake County, Michigan. It was in force for 43 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: Apr 25, 2008, 9:47 PM EDT (01:47 UTC)
Expired: Apr 25, 2008, 10:30 PM EDT
In force: 43 min
Issued by: NWS Grand Rapids, MI
Area: Storm-based polygon

County Lake County, MI

The radar

The Grand Rapids radar (KGRR), 124 km from the middle of the area, began a volume at 01:49 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
Apr 25, 8:38 PM EDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Detroit, MI (KDTX), launched 00:00Z, 1.8 hours before the alert went out and 238 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: 338 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 1611 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 262 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.5

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 Apr 25, 7:06 PM EDT, 2 hours 41 minutes earlier.

Area forecast discussion, Apr 25, 7:06 PM EDT, 2 hours 41 minutes before

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Hazardous weather outlook, Apr 25, 5:18 PM EDT, 4 hours 29 minutes before

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In the hours before

Local storm report, Apr 25, 4:04 PM EDT, 5 hours 43 minutes before

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Local storm report, Apr 25, 4:23 PM EDT, 5 hours 24 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
Apr 25, 9:24 PM EDT	Severe Thunderstorm Warning	GRR	Mason	51 min
Apr 25, 9:55 PM EDT	Special Marine Warning	GRR		65 min
Apr 25, 10:02 PM EDT	Special Weather Statement	GRR	Allegan, Ottawa, Van Buren	28 min
Apr 25, 10:11 PM EDT	Special Weather Statement	GRR	Muskegon, Newaygo, Oceana	49 min
Apr 25, 10:21 PM EDT	Special Weather Statement	GRR	Osceola	39 min
Apr 25, 10:28 PM EDT	Special Weather Statement	GRR	Newaygo	47 min
Apr 25, 11:52 PM EDT	Special Weather Statement	GRR	Kalamazoo, Van Buren	23 min
Apr 26, 12:02 AM EDT	Severe Thunderstorm Warning	GRR	Van Buren	43 min
Apr 26, 12:31 AM EDT	Special Weather Statement	GRR	Barry, Kalamazoo	44 min
Apr 26, 1:23 AM EDT	Special Weather Statement	GRR	Barry, Ionia	37 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.