Alert archive / Michigan / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 177, NWS Grand Rapids, MI

October 4, 2006Muskegon County, Michigan

NWS Grand Rapids, MI issued this severe thunderstorm warning at Oct 4, 2006, 2:06 AM EDT for Muskegon County, Michigan. It was in force for 34 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: Oct 4, 2006, 2:06 AM EDT (06:06 UTC)
Expired: Oct 4, 2006, 2:40 AM EDT
In force: 34 min
Issued by: NWS Grand Rapids, MI
Area: Counties, with a storm outline in the text

County Muskegon County, MI

The radar

The Grand Rapids radar (KGRR), 65 km from the middle of the area, began a volume at 06:08 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
Oct 3, 10:37 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 6.1 hours before the alert went out and 206 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: 925 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 218 m²/s²
0-3 km storm-relative helicity: 336 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.1

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 Oct 3, 4:15 PM EDT, 9 hours 51 minutes earlier.

Area forecast discussion, Oct 3, 4:15 PM EDT, 9 hours 51 minutes before

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Hazardous weather outlook, Oct 3, 5:02 PM EDT, 9 hours 4 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
Oct 3, 9:37 PM EDT	Special Marine Warning	GRR		53 min
Oct 3, 10:11 PM EDT	Severe Thunderstorm Warning	GRR	Oceana	20 min
Oct 3, 10:23 PM EDT	Severe Thunderstorm Warning	GRR	Mason	25 min
Oct 3, 10:57 PM EDT	Severe Thunderstorm Warning	GRR	Lake	22 min
Oct 4, 12:06 AM EDT	Special Marine Warning	GRR		54 min
Oct 4, 12:49 AM EDT	Severe Thunderstorm Warning	GRR	Mason	56 min
Oct 4, 12:52 AM EDT	Severe Thunderstorm Warning	GRR	Lake	53 min
Oct 4, 12:56 AM EDT	Special Marine Warning	GRR		86 min
Oct 4, 1:07 AM EDT	Severe Thunderstorm Warning	GRR	Osceola	53 min
Oct 4, 1:33 AM EDT	Severe Thunderstorm Warning	GRR	Oceana	47 min
Oct 4, 1:35 AM EDT	Special Marine Warning	GRR		76 min
Oct 4, 1:59 AM EDT	Severe Thunderstorm Warning	GRR	Mecosta, Newaygo	61 min
Oct 4, 6:39 AM EDT	Special Marine Warning	GRR		53 min
Oct 4, 6:58 AM EDT	Severe Thunderstorm Warning	GRR	Gratiot, Isabella, Montcalm	47 min

Nearby

Severe Thunderstorm Warnings in Michigan, 2006 Every severe thunderstorm warning in 2006

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.