Alert archive / Indiana / Mesoscale Discussions in 2014

Mesoscale Discussion 1580

August 19, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Aug 19, 2014, 1:03 PM CDT for 4 states. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued
Aug 19, 2014, 1:03 PM CDT (18:03 UTC)
Expired
Aug 19, 2014, 2:00 PM CDT
In force
57 min
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 61 counties

Champaign County, IL, Douglas County, IL, Edgar County, IL, Iroquois County, IL, Vermilion County, IL, Adams County, IN, Allen County, IN, Benton County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, DeKalb County, IN, Elkhart County, IN, Fountain County, IN, Fulton County, IN, Grant County, IN, Hamilton County, IN, Howard County, IN, Huntington County, IN, Jasper County, IN, Kosciusko County, IN, LaGrange County, IN, LaPorte County, IN, Marshall County, IN, Miami County, IN, Montgomery County, IN, Newton County, IN, Noble County, IN, Parke County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, Tippecanoe County, IN, Tipton County, IN, Vermillion County, IN, Wabash County, IN, Warren County, IN, Wells County, IN, White County, IN, Whitley County, IN, Branch County, MI, Calhoun County, MI, Cass County, MI, Eaton County, MI, Genesee County, MI, Hillsdale County, MI, Ingham County, MI, Jackson County, MI, Kalamazoo County, MI, Lenawee County, MI, Livingston County, MI, Oakland County, MI, Saint Joseph County, MI, Shiawassee County, MI, Washtenaw County, MI, Defiance County, OH, Fulton County, OH, Paulding County, OH, Williams County, OH

The radar

The Northern Indiana radar (KIWX), 50 km from the middle of the area, began a volume at 18:05 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

Lincoln, IL (KILX), launched 12:00Z, 6.1 hours before the alert went out and 228 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, Lincoln, IL at 12:00Z on 2014-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1195 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, Lincoln, IL at 12:00Z on 2014-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 109 square meters per square second.1939Sfc1 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
1195 J/kg
Mixed-layer CIN
-113 J/kg
Mixed-layer LCL
887 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
109 m²/s²
0-3 km storm-relative helicity
114 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

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 18, 9:49 PM CDTMesoscale DiscussionSPCJo Daviess, Stephenson56 min
Aug 19, 2:20 PM CDTMesoscale DiscussionSPCAlexander, Crawford, Edwards, Franklin, Gallatin, Hamilton and 16 more115 min
Aug 19, 1:34 PM CDTSevere Thunderstorm WatchSPCDeKalb, Elkhart, Fulton, Kosciusko, LaGrange, Marshall and 4 more5 hr
Aug 19, 3:51 PM CDTMesoscale DiscussionSPCAllen, DeKalb, LaGrange, Noble, Steuben, Whitley84 min
Aug 19, 5:24 PM CDTMesoscale DiscussionSPCBartholomew, Blackford, Boone, Brown, Clay, Decatur and 22 more96 min

Nearby

Mesoscale Discussions in Indiana, 2014Mesoscale Discussions in Michigan, 2014Mesoscale Discussions in Illinois, 2014Every mesoscale discussion in 2014

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.