Alert archive / Michigan / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 150

May 6, 200422 counties in Michigan

The Storm Prediction Center issued this severe thunderstorm watch at May 6, 2004, 11:15 AM EDT for 22 counties in Michigan. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
May 6, 2004, 11:15 AM EDT (15:15 UTC)
Expired
May 6, 2004, 4:00 PM EDT
In force
5 hr
Issued by
the Storm Prediction Center
All 22 counties

Barry County, MI, Bay County, MI, Clinton County, MI, Eaton County, MI, Genesee County, MI, Gratiot County, MI, Ingham County, MI, Ionia County, MI, Isabella County, MI, Kent County, MI, Lake County, MI, Lapeer County, MI, Livingston County, MI, Mecosta County, MI, Midland County, MI, Montcalm County, MI, Newaygo County, MI, Oakland County, MI, Osceola County, MI, Saginaw County, MI, Shiawassee County, MI, Tuscola County, MI

The radar

The Grand Rapids radar (KGRR), 75 km from the middle of the area, began a volume at 15:18 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.

Discussions around it

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

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 3.3 hours before the alert went out and 278 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-pSkew-T log-p diagram, Green Bay/Straub, WI at 12:00Z on 2004-05-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Green Bay/Straub, WI at 12:00Z on 2004-05-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 257 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1345 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
257 m²/s²
0-3 km storm-relative helicity
212 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 6, 10:36 AM EDTMesoscale DiscussionSPCAlpena, Antrim, Arenac, Bay, Cheboygan, Clare and 21 more114 min
May 6, 2:22 PM EDTMesoscale DiscussionSPCBay, Clinton, Genesee, Gratiot, Ionia, Isabella and 11 more83 min

Nearby

Severe Thunderstorm Watches in Michigan, 2004Every 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; radar from the NEXRAD Level II archive.