Alert archive / Indiana / Mesoscale Discussions in 2008

Mesoscale Discussion 2541

December 27, 20085 states

The Storm Prediction Center issued this mesoscale discussion at Dec 27, 2008, 5:06 PM CST for 5 states. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
Dec 27, 2008, 5:06 PM CST (23:06 UTC)
Expired
Dec 27, 2008, 6:30 PM CST
In force
84 min
Issued by
the Storm Prediction Center
All 77 counties

Crawford County, IL, Edwards County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Johnson County, IL, Lawrence County, IL, Massac County, IL, Pope County, IL, Pulaski County, IL, Richland County, IL, Saline County, IL, Wabash County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Brown County, IN, Clay County, IN, Daviess County, IN, Dubois County, IN, Gibson County, IN, Greene County, IN, Hendricks County, IN, Johnson County, IN, Knox County, IN, Lawrence County, IN, Martin County, IN, Monroe County, IN, Morgan County, IN, Owen County, IN, Pike County, IN, Posey County, IN, Putnam County, IN, Spencer County, IN, Sullivan County, IN, Vanderburgh County, IN, Vigo County, IN, Warrick County, IN, Ballard County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Christian County, KY, Crittenden County, KY, Daviess County, KY, Fulton County, KY, Graves County, KY, Henderson County, KY, Hickman County, KY, Hopkins County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, McLean County, KY, Trigg County, KY, Union County, KY, Webster County, KY, Mississippi County, MO, Benton County, TN, Carroll County, TN, Chester County, TN, Crockett County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, Obion County, TN, Stewart County, TN, Tipton County, TN, Weakley County, TN

The radar

The Paducah radar (KPAH), 57 km from the middle of the area, began a volume at 23:10 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

Little Rock, AR (KLZK), launched 12:00Z, 11.1 hours before the alert went out and 309 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, Little Rock, AR at 12:00Z on 2008-12-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 472 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, Little Rock, AR at 12:00Z on 2008-12-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 503 square meters per square second.1939587897Sfc1 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
472 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
509 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
503 m²/s²
0-3 km storm-relative helicity
582 m²/s²
Significant tornado parameter
1.2
Supercell composite
6.6

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
Dec 26, 11:15 PM CSTMesoscale DiscussionSPCAdams, Brown, Fulton, Hancock, Henderson, Knox and 6 more90 min
Dec 27, 1:35 AM CSTTornado WatchSPCAdams, Brown, Calhoun, Cass, Champaign, Christian and 26 more7 hr
Dec 27, 4:30 AM CSTTornado WatchSPCAdams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more8 hr
Dec 27, 8:03 AM CSTMesoscale DiscussionSPCBond, Brown, Calhoun, Clinton, Greene, Jersey and 8 more117 min
Dec 27, 8:48 AM CSTMesoscale DiscussionSPCCass, Christian, DeWitt, Fulton, Knox, Logan and 9 more27 min
Dec 27, 9:34 AM CSTMesoscale DiscussionSPCAlexander, Bond, Calhoun, Clinton, Jackson, Jersey and 8 more56 min
Dec 27, 10:26 AM CSTMesoscale DiscussionSPCAdams, Alexander, Bond, Brown, Calhoun, Cass and 45 more94 min
Dec 27, 10:58 AM CSTTornado WatchSPCBrown, Bureau, Calhoun, Cass, Champaign, Christian and 43 more8 hr
Dec 27, 11:46 AM CSTMesoscale DiscussionSPCBureau, Calhoun, Cass, Christian, DeKalb, DeWitt and 32 more89 min
Dec 27, 12:30 PM CSTTornado WatchSPCCook, DeKalb, DuPage, Ford, Grundy, Iroquois and 6 more4 hr
Dec 27, 12:45 PM CSTTornado WatchSPCBond, Clinton, Fayette, Jersey, Macoupin, Madison and 6 more5 hr
Dec 27, 1:52 PM CSTTornado WatchSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more5 hr
Dec 27, 1:54 PM CSTMesoscale DiscussionSPCBond, Champaign, Christian, Clark, Clay, Clinton and 29 more2 hr
Dec 27, 3:46 PM CSTMesoscale DiscussionSPCAlexander, Clark, Clay, Clinton, Coles, Crawford and 27 more89 min
Dec 26, 6:47 PM CSTMesoscale DiscussionSPCBarton, Bates, Buchanan, Cass, Clay, Jackson and 5 more58 min
Dec 26, 9:05 PM CSTMesoscale DiscussionSPCBarry, McDonald, Newton85 min
Dec 26, 9:51 PM CSTTornado WatchSPCBates, Buchanan, Caldwell, Carroll, Cass, Chariton and 13 more7 hr
Dec 27, 12:03 AM CSTTornado WatchSPCAudrain, Barry, Barton, Benton, Boone, Callaway and 40 more7 hr
Dec 27, 3:32 AM CSTMesoscale DiscussionSPCBarry, Barton, Bates, Benton, Boone, Callaway and 51 more88 min
Dec 27, 9:41 AM CSTMesoscale DiscussionSPCAdair, Caldwell, Carroll, Cass, Clay, Clinton and 12 more3 hr
Dec 27, 1:20 PM CSTMesoscale DiscussionSPCDunklin, Pemiscot25 min
Dec 27, 5:47 PM CSTSevere Thunderstorm WatchSPCCarroll, Chester, Crockett, Decatur, Dyer, Fayette and 14 more4 hr

Nearby

Mesoscale Discussions in Indiana, 2008Mesoscale Discussions in Kentucky, 2008Mesoscale Discussions in Tennessee, 2008Every mesoscale discussion in 2008

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.