Alert archive / Michigan / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 145, NWS Detroit, MI

July 17, 2004Lapeer County, Michigan

NWS Detroit, MI issued this severe thunderstorm warning at Jul 17, 2004, 4:55 PM EDT for Lapeer County, Michigan. It was in force for 65 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 17, 2004, 4:55 PM EDT (20:55 UTC)
Expired: Jul 17, 2004, 6:00 PM EDT
In force: 65 min
Issued by: NWS Detroit, MI
Area: Counties, with a storm outline in the text

County Lapeer County, MI

The radar

The Detroit radar (KDTX), 48 km from the middle of the area, began a volume at 20:58 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, 8.9 hours before the alert went out and 44 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: 187 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 861 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: -33 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 Detroit, MI wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 17, 3:20 PM EDT, 1 hour 35 minutes earlier.

Area forecast discussion, Jul 17, 3:20 PM EDT, 1 hour 35 minutes before

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Hazardous weather outlook, Jul 17, 3:05 PM EDT, 1 hour 50 minutes before

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In the hours before

Local storm report, Jul 17, 3:30 PM EDT, 1 hour 25 minutes before

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Local storm report, Jul 17, 4:05 PM EDT, 50 minutes before

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Local storm report, Jul 17, 4:31 PM EDT, 24 minutes before

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The office that day

Everything else NWS Detroit, MI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 17, 2:16 PM EDT	Severe Thunderstorm Warning	DTX	Tuscola	44 min
Jul 17, 2:47 PM EDT	Severe Thunderstorm Warning	DTX	Sanilac	58 min
Jul 17, 3:11 PM EDT	Severe Thunderstorm Warning	DTX	Genesee	64 min
Jul 17, 4:27 PM EDT	Severe Thunderstorm Warning	DTX	Macomb, Oakland	63 min
Jul 17, 5:11 PM EDT	Severe Thunderstorm Warning	DTX	Saint Clair	64 min

Nearby

Severe Thunderstorm Warnings in Michigan, 2004 Every severe thunderstorm warning in 2004

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.