Alert archive / Michigan / Mesoscale Discussions in 2003

Mesoscale Discussion 769

May 5, 2003Steuben County, Indiana; 20 counties in Michigan; Lucas County, Ohio

The Storm Prediction Center issued this mesoscale discussion at May 5, 2003, 4:27 PM EST for Steuben County, Indiana; 20 counties in Michigan; Lucas County, Ohio. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
May 5, 2003, 4:27 PM EST (21:27 UTC)
Expired
May 5, 2003, 7:00 PM EST
In force
3 hr
Issued by
the Storm Prediction Center
All 22 counties

Steuben County, IN, Branch County, MI, Calhoun County, MI, Clinton County, MI, Eaton County, MI, Genesee County, MI, Hillsdale County, MI, Ingham County, MI, Jackson County, MI, Lapeer County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Monroe County, MI, Oakland County, MI, Saginaw County, MI, Saint Clair County, MI, Saint Joseph County, MI, Shiawassee County, MI, Washtenaw County, MI, Wayne County, MI, Lucas County, OH

The radar

The Detroit radar (KDTX), 65 km from the middle of the area, began a volume at 21:26 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 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, 9.5 hours before the alert went out and 69 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 2003-05-05Temperature 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 2003-05-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 145 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
496 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
145 m²/s²
0-3 km storm-relative helicity
401 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 4, 8:05 PM ESTMesoscale DiscussionSPCPosey85 min
May 4, 9:26 PM ESTMesoscale DiscussionSPCPosey2 hr
May 4, 10:40 PM ESTTornado WatchSPCGibson, Pike, Posey, Spencer, Vanderburgh, Warrick5 hr
May 4, 11:37 PM ESTMesoscale DiscussionSPCClark, Crawford, Dubois, Floyd, Harrison, Jefferson and 5 more23 min
May 4, 11:45 PM ESTTornado WatchSPCClark, Crawford, Floyd, Harrison, Orange, Perry and 1 more5 hr
May 5, 1:30 AM ESTMesoscale DiscussionSPCGibson, Pike, Posey, Spencer, Vanderburgh, Warrick90 min
May 5, 1:46 AM ESTMesoscale DiscussionSPCBartholomew, Boone, Brown, Clay, Clinton, Crawford and 34 more89 min
May 5, 2:31 AM ESTMesoscale DiscussionSPCCrawford, Floyd, Harrison89 min
May 5, 3:41 AM ESTMesoscale DiscussionSPCGibson, Posey, Spencer, Vanderburgh, Warrick34 min
May 5, 3:50 AM ESTTornado WatchSPCGibson, Posey, Spencer, Vanderburgh, Warrick6 hr
May 5, 6:32 AM ESTMesoscale DiscussionSPCGibson, Posey, Spencer, Vanderburgh, Warrick88 min
May 5, 7:35 AM ESTTornado WatchSPCHarrison, Perry5 hr
May 5, 9:19 AM ESTMesoscale DiscussionSPCGibson, Posey, Spencer, Vanderburgh, Warrick56 min
May 5, 10:12 AM ESTMesoscale DiscussionSPCHarrison, Perry93 min
May 5, 11:59 AM ESTMesoscale DiscussionSPCHarrison, Perry61 min
May 5, 12:20 PM ESTTornado WatchSPCClark, Crawford, Dubois, Floyd, Gibson, Harrison and 6 more7 hr
May 5, 2:47 PM ESTMesoscale DiscussionSPCCrawford, Dubois, Floyd, Gibson, Harrison, Perry and 4 more118 min
May 5, 4:42 PM ESTMesoscale DiscussionSPCOhio3 hr
May 5, 6:33 PM ESTMesoscale DiscussionSPCClark, Crawford, Dubois, Floyd, Gibson, Harrison and 6 more57 min
May 5, 4:45 PM ESTSevere Thunderstorm WatchSPCBranch, Calhoun, Clinton, Eaton, Genesee, Gratiot and 14 more4 hr
May 5, 5:15 PM ESTTornado WatchSPCAdams, Athens, Brown, Champaign, Clark, Clermont and 24 more5 hr
May 5, 6:47 PM ESTMesoscale DiscussionSPCAdams, Athens, Brown, Clermont, Clinton, Fayette and 12 more88 min

Nearby

Mesoscale Discussions in Michigan, 2003Mesoscale Discussions in Indiana, 2003Mesoscale Discussions in Ohio, 2003Every mesoscale discussion in 2003

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.