Alert archive / Indiana / Mesoscale Discussions in 2011

Mesoscale Discussion 598

April 26, 201111 counties in Illinois; 35 counties in Indiana; 8 counties in Kentucky

The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2011, 4:38 PM CDT for 11 counties in Illinois; 35 counties in Indiana; 8 counties in Kentucky. It was in force for 37 min.

The area

The outline as issued.

The facts

Issued
Apr 26, 2011, 4:38 PM CDT (21:38 UTC)
Expired
Apr 26, 2011, 5:15 PM CDT
In force
37 min
Issued by
the Storm Prediction Center
All 54 counties

Clark County, IL, Crawford County, IL, Edwards County, IL, Gallatin County, IL, Hamilton County, IL, Jasper County, IL, Lawrence County, IL, Richland County, IL, Wabash County, IL, Wayne County, IL, White County, IL, Bartholomew County, IN, Brown County, IN, Clark County, IN, Clay County, IN, Crawford County, IN, Daviess County, IN, Dearborn County, IN, Decatur County, IN, Dubois County, IN, Floyd County, IN, Franklin County, IN, Gibson County, IN, Greene County, IN, Harrison County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Knox County, IN, Lawrence County, IN, Martin County, IN, Monroe County, IN, Morgan County, IN, Orange County, IN, Owen County, IN, Perry County, IN, Pike County, IN, Posey County, IN, Ripley County, IN, Scott County, IN, Spencer County, IN, Sullivan County, IN, Vanderburgh County, IN, Vigo County, IN, Warrick County, IN, Washington County, IN, Breckinridge County, KY, Bullitt County, KY, Hancock County, KY, Henderson County, KY, Jefferson County, KY, Meade County, KY, Oldham County, KY, Trimble County, KY

The radar

The Louisville radar (KLVX), 69 km from the middle of the area, began a volume at 21:42 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

Nashville Metro, TN (KBNA), launched 12:00Z, 9.6 hours before the alert went out and 244 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, Nashville Metro, TN at 12:00Z on 2011-04-26Temperature 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, Nashville Metro, TN at 12:00Z on 2011-04-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 60 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
486 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
60 m²/s²
0-3 km storm-relative helicity
279 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
Apr 25, 7:34 PM CDTMesoscale DiscussionSPCAlexander, Franklin, Gallatin, Hardin, Jackson, Johnson and 7 more116 min
Apr 25, 11:05 PM CDTMesoscale DiscussionSPCGallatin, Hardin, Massac, Pope, Saline, White115 min
Apr 26, 12:26 PM CDTMesoscale DiscussionSPCChampaign, Clark, Douglas, Edgar, Ford, Iroquois and 1 more94 min
Apr 26, 2:02 PM CDTTornado WatchSPCChampaign, Clark, Coles, Cumberland, Douglas, Edgar and 2 more7 hr
Apr 26, 2:41 PM CDTMesoscale DiscussionSPCMassac94 min
Apr 26, 3:02 PM CDTTornado Watch PDSSPCHardin, Massac, Pope7 hr
Apr 26, 4:50 PM CDTTornado WatchSPCGallatin, Saline, Wabash, White5 hr
Apr 26, 6:17 PM CDTMesoscale DiscussionSPCAlexander, Hardin, Johnson, Massac, Pope, Pulaski and 1 more118 min
Apr 26, 3:53 PM CDTMesoscale DiscussionSPCCarroll, Cass, Elkhart, Fulton, Howard, Jasper and 13 more67 min
Apr 25, 11:42 PM CDTSevere Thunderstorm WatchSPCAllen, Barren, Breckinridge, Butler, Caldwell, Calloway and 19 more7 hr
Apr 26, 2:04 AM CDTMesoscale DiscussionSPCAllen, Barren, Breckinridge, Edmonson, Grayson, Hardin and 5 more56 min
Apr 26, 12:49 PM CDTMesoscale DiscussionSPCMartin56 min

Nearby

Mesoscale Discussions in Indiana, 2011Mesoscale Discussions in Illinois, 2011Mesoscale Discussions in Kentucky, 2011Every mesoscale discussion in 2011

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.