Alert archive / Michigan / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 232

May 21, 200427 counties in Michigan

The Storm Prediction Center issued this severe thunderstorm watch at May 21, 2004, 11:55 AM EDT for 27 counties in Michigan. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: May 21, 2004, 11:55 AM EDT (15:55 UTC)
Expired: May 21, 2004, 5:00 PM EDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 27 counties

Barry County, MI, Bay County, MI, Calhoun County, MI, Clinton County, MI, Eaton County, MI, Genesee County, MI, Gratiot County, MI, Ingham County, MI, Ionia County, MI, Isabella County, MI, Jackson County, MI, Kalamazoo County, MI, Kent County, MI, Lapeer County, MI, Livingston County, MI, Macomb County, MI, Mecosta County, MI, Midland County, MI, Montcalm County, MI, Oakland County, MI, Saginaw County, MI, Saint Clair County, MI, Sanilac County, MI, Shiawassee County, MI, Tuscola County, MI, Washtenaw County, MI, Wayne County, MI

Warnings issued inside it

15 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
May 21, 12:04 PM EDT	Severe Thunderstorm Warning	GRR	Barry, Kent	56 min
May 21, 12:23 PM EDT	Tornado Warning	GRR	Barry	37 min
May 21, 12:30 PM EDT	Severe Thunderstorm Warning	GRR	Kalamazoo	75 min
May 21, 12:33 PM EDT	Severe Thunderstorm Warning	GRR	Ionia	57 min
May 21, 12:48 PM EDT	Severe Thunderstorm Warning	GRR	Calhoun, Eaton	57 min
May 21, 12:58 PM EDT	Severe Thunderstorm Warning	DTX	Shiawassee	77 min
May 21, 1:05 PM EDT	Tornado Warning	GRR	Eaton	25 min
May 21, 1:09 PM EDT	Severe Thunderstorm Warning	GRR	Ingham, Jackson	51 min
May 21, 1:34 PM EDT	Severe Thunderstorm Warning	DTX	Livingston	56 min
May 21, 1:36 PM EDT	Severe Thunderstorm Warning	DTX	Washtenaw	54 min
May 21, 2:04 PM EDT	Severe Thunderstorm Warning	DTX	Wayne	56 min
May 21, 2:08 PM EDT	Severe Thunderstorm Warning	DTX	Oakland	67 min
May 21, 2:12 PM EDT	Flash Flood Warning	DTX	Washtenaw, Wayne	2 hr
May 21, 2:34 PM EDT	Severe Thunderstorm Warning	DTX	Macomb	56 min
May 21, 2:49 PM EDT	Severe Thunderstorm Warning	DTX	Saint Clair	56 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 3.9 hours before the alert went out and 95 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: 899 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 217 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 20, 10:05 PM EDT	Severe Thunderstorm Watch	SPC	Allegan, Barry, Berrien, Branch, Calhoun, Cass and 17 more	5 hr
May 21, 10:40 AM EDT	Mesoscale Discussion	SPC	Allegan, Antrim, Arenac, Barry, Bay, Berrien and 49 more	2 hr
May 21, 1:05 PM EDT	Severe Thunderstorm Watch	SPC	Branch, Hillsdale, Saint Joseph	4 hr
May 21, 2:19 PM EDT	Mesoscale Discussion	SPC	Macomb, Monroe, Wayne	116 min

Nearby

Severe Thunderstorm Watches in Michigan, 2004 Every severe thunderstorm watch 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.