Alert archive / Michigan / Mesoscale Discussions in 2007

Mesoscale Discussion 1857

August 23, 20075 counties in Indiana; 21 counties in Michigan; 5 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Aug 23, 2007, 2:48 AM EDT for 5 counties in Indiana; 21 counties in Michigan; 5 counties in Ohio. It was in force for 27 min.

The area

The outline as issued.

The facts

Issued
Aug 23, 2007, 2:48 AM EDT (06:48 UTC)
Expired
Aug 23, 2007, 3:15 AM EDT
In force
27 min
Issued by
the Storm Prediction Center
All 31 counties

DeKalb County, IN, LaGrange County, IN, Noble County, IN, Steuben County, IN, Whitley County, IN, Barry County, MI, Branch County, MI, Calhoun County, MI, Clinton County, MI, Eaton County, MI, Genesee County, MI, Hillsdale County, MI, Ingham County, MI, Jackson County, MI, Kalamazoo County, MI, Lapeer County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Monroe County, MI, Oakland County, MI, Saint Clair County, MI, Saint Joseph County, MI, Shiawassee County, MI, Washtenaw County, MI, Wayne County, MI, Defiance County, OH, Fulton County, OH, Henry County, OH, Lucas County, OH, Williams County, OH

The radar

The Detroit radar (KDTX), 114 km from the middle of the area, began a volume at 06:51 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 nearest sounding before it

Detroit, MI (KDTX), launched 00:00Z, 6.8 hours before the alert went out and 118 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 00:00Z on 2007-08-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1963 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 2007-08-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 45 square meters per square second.193958Sfc1 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
1963 J/kg
Mixed-layer CIN
-18 J/kg
Mixed-layer LCL
1187 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
45 m²/s²
0-3 km storm-relative helicity
123 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
Aug 22, 8:21 PM EDTMesoscale DiscussionSPCJasper, Lake, LaPorte, Newton, Porter, Starke2 hr
Aug 23, 11:36 AM EDTMesoscale DiscussionSPCLake114 min
Aug 23, 1:28 PM EDTSevere Thunderstorm WatchSPCBenton, Jasper, Lake, Newton, Porter7 hr
Aug 23, 3:07 PM EDTMesoscale DiscussionSPCAllen, Cass, DeKalb, Elkhart, Fulton, Huntington and 13 more83 min
Aug 23, 4:09 PM EDTSevere Thunderstorm WatchSPCAllen, DeKalb, Elkhart, Fulton, Kosciusko, LaGrange and 8 more8 hr
Aug 23, 4:10 PM EDTMesoscale DiscussionSPCJasper, Lake, Newton95 min
Aug 23, 6:38 PM EDTMesoscale DiscussionSPCDeKalb, Elkhart, Fulton, Jasper, Kosciusko, LaGrange and 11 more97 min
Aug 22, 8:19 PM EDTSevere Thunderstorm WatchSPCAllegan, Barry, Clinton, Eaton, Genesee, Gratiot and 16 more4 hr
Aug 23, 12:01 AM EDTMesoscale DiscussionSPCClinton, Eaton, Genesee, Gratiot, Ingham, Lapeer and 8 more59 min
Aug 23, 11:17 AM EDTMesoscale DiscussionSPCCarroll, Columbiana, Coshocton, Guernsey, Harrison, Holmes and 6 more88 min
Aug 23, 2:43 PM EDTSevere Thunderstorm WatchSPCAshland, Belmont, Carroll, Columbiana, Coshocton, Guernsey and 14 more6 hr
Aug 23, 5:30 PM EDTMesoscale DiscussionSPCBelmont, Carroll, Columbiana, Coshocton, Guernsey, Harrison and 10 more60 min

Nearby

Mesoscale Discussions in Michigan, 2007Mesoscale Discussions in Indiana, 2007Mesoscale Discussions in Ohio, 2007Every mesoscale discussion in 2007

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.