Alert archive / Michigan / Mesoscale Discussions in 2004

Mesoscale Discussion 820

May 22, 200424 counties in Michigan

The Storm Prediction Center issued this mesoscale discussion at May 22, 2004, 2:09 PM EDT for 24 counties in Michigan. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued
May 22, 2004, 2:09 PM EDT (18:09 UTC)
Expired
May 22, 2004, 3:15 PM EDT
In force
66 min
Issued by
the Storm Prediction Center
All 24 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, Midland County, MI, Montcalm County, MI, Oakland County, MI, Saginaw County, MI, Shiawassee County, MI, Tuscola County, MI, Washtenaw County, MI, Wayne County, MI

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Detroit, MI (KDTX), launched 12:00Z, 6.2 hours before the alert went out and 104 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, Detroit, MI at 12:00Z on 2004-05-22Temperature 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, Detroit, MI at 12:00Z on 2004-05-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 51 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
955 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
51 m²/s²
0-3 km storm-relative helicity
162 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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.

IssuedProductOfficeCountiesLasted
May 22, 2:48 AM EDTMesoscale DiscussionSPCAllegan, Barry, Berrien, Branch, Calhoun, Cass and 10 more57 min
May 22, 12:35 PM EDTSevere Thunderstorm WatchSPCBerrien, Branch, Cass, Hillsdale, Lenawee, Saint Joseph6 hr
May 22, 2:30 PM EDTTornado WatchSPCBarry, Calhoun, Clinton, Eaton, Genesee, Gratiot and 18 more6 hr
May 22, 4:20 PM EDTSevere Thunderstorm WatchSPCMonroe8 hr
May 22, 6:29 PM EDTMesoscale DiscussionSPCMonroe91 min

Nearby

Mesoscale Discussions in Michigan, 2004Every mesoscale discussion 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.