Alert archive / Indiana / Mesoscale Discussions in 2011

Mesoscale Discussion 897

May 23, 20114 states

The Storm Prediction Center issued this mesoscale discussion at May 23, 2011, 2:52 PM CDT for 4 states. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued
May 23, 2011, 2:52 PM CDT (19:52 UTC)
Expired
May 23, 2011, 3:45 PM CDT
In force
53 min
Issued by
the Storm Prediction Center
All 81 counties

Clark County, IL, Clay County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Edgar County, IL, Edwards 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, Fayette County, IN, Floyd County, IN, Franklin County, IN, Gibson County, IN, Greene County, IN, Hancock County, IN, Harrison County, IN, Hendricks County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Johnson County, IN, Knox County, IN, Lawrence County, IN, Marion County, IN, Martin County, IN, Monroe County, IN, Morgan County, IN, Ohio County, IN, Orange County, IN, Owen County, IN, Parke County, IN, Perry County, IN, Pike County, IN, Posey County, IN, Putnam County, IN, Ripley County, IN, Rush County, IN, Scott County, IN, Shelby County, IN, Spencer County, IN, Sullivan County, IN, Switzerland County, IN, Union County, IN, Vanderburgh County, IN, Vigo County, IN, Warrick County, IN, Washington County, IN, Wayne County, IN, Boone County, KY, Campbell County, KY, Carroll County, KY, Gallatin County, KY, Grant County, KY, Henry County, KY, Jefferson County, KY, Kenton County, KY, Oldham County, KY, Owen County, KY, Pendleton County, KY, Shelby County, KY, Trimble County, KY, Butler County, OH, Clermont County, OH, Hamilton County, OH, Montgomery County, OH, Preble County, OH, Warren County, OH

The radar

The Indianapolis radar (KIND), 85 km from the middle of the area, began a volume at 19:55 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, 7.9 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 2011-05-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 504 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 2011-05-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 139 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
504 J/kg
Mixed-layer CIN
-92 J/kg
Mixed-layer LCL
1171 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
139 m²/s²
0-3 km storm-relative helicity
167 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

223 
ACUS11 KWNS 231952
SWOMCD
SPC MCD 231952 
OHZ000-KYZ000-INZ000-ILZ000-232045-

MESOSCALE DISCUSSION 0897
NWS STORM PREDICTION CENTER NORMAN OK
0252 PM CDT MON MAY 23 2011

AREAS AFFECTED...SRN IL/IND...NRN KY...SWRN OH

CONCERNING...SEVERE THUNDERSTORM WATCH 340...341...

VALID 231952Z - 232045Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
340...341...CONTINUES.

NEW WW WILL BE ISSUED BY 21Z DOWNSTREAM OF WW 340/341.

QLCS ACROSS SRN IL APPEARS TO HAVE RECENTLY ACCELERATED AS TSTM
CORES HAVE BECOME ABSORBED ALONG THE SRN FLANK OF CONVECTIVE
OUTFLOW. AS TEMPERATURES AHEAD OF THIS LINE HAVE NOW WARMED INTO THE
MIDDLE TO UPPER 80S...MODIFIED 18Z ILX RAOB SUGGESTS A VERY UNSTABLE
AIR MASS IS PREVALENT ALONG AND JUST N OF THE LOWER OH VALLEY WITH
MLCAPE OF 2500 TO 4000 J/KG. WITH A MODERATELY STRONG NEARLY
UNIDIRECTIONAL W/SWLY LOW/MID-LEVEL WIND PROFILE...EWD FORWARD
PROPAGATION OF THE MCS SHOULD PERSIST. A SWATH OF DAMAGING WIND AND
EMBEDDED MARGINALLY SEVERE HAIL APPEARS HIGHLY PROBABLE ACROSS SRN
IND AND PERHAPS PARTS OF NRN KY/SWRN OH.

..GRAMS.. 05/23/2011

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...ILN...LMK...IND...PAH...ILX...LSX...

LAT...LON   37888696 37988852 38198882 38448877 39088820 39628836
            39818754 39908667 39908572 39868472 39718408 39398390
            39028399 38568432 38098547 37888696

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 22, 7:52 PM CDTMesoscale DiscussionSPCBond, Calhoun, Clinton, Greene, Jersey, Macoupin and 6 more53 min
May 22, 8:26 PM CDTTornado WatchSPCBond, Calhoun, Cass, Champaign, Christian, Clay and 35 more8 hr
May 22, 9:35 PM CDTMesoscale DiscussionSPCDeKalb, DuPage, Grundy, Iroquois, Kane, Kankakee and 6 more55 min
May 22, 10:24 PM CDTMesoscale DiscussionSPCClark, Clay, Coles, Crawford, Cumberland, Edgar and 9 more66 min
May 23, 7:25 AM CDTMesoscale DiscussionSPCEdgar, Vermilion65 min
May 23, 10:55 AM CDTSevere Thunderstorm WatchSPCAlexander, Bond, Calhoun, Clinton, Edwards, Fayette and 27 more7 hr
May 23, 12:37 PM CDTMesoscale DiscussionSPCBond, Christian, Clark, Clay, Clinton, Coles and 34 more83 min
May 23, 12:54 PM CDTSevere Thunderstorm WatchSPCChampaign, Christian, Clark, Clay, Coles, Crawford and 13 more5 hr
May 23, 3:58 PM CDTMesoscale DiscussionSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 14 more92 min
May 23, 4:24 PM CDTMesoscale DiscussionSPCMassac96 min
May 22, 7:20 PM CDTMesoscale DiscussionSPCAdams, Allen, Benton, Blackford, Boone, Carroll and 33 more115 min
May 22, 9:59 PM CDTMesoscale DiscussionSPCAllen, Carroll, Cass, DeKalb, Elkhart, Fulton and 14 more61 min
May 23, 3:20 AM CDTMesoscale DiscussionSPCClark, Floyd, Harrison, Jefferson, Ohio, Scott and 1 more85 min
May 23, 11:35 AM CDTMesoscale DiscussionSPCAdams, Allen, Blackford, Cass, DeKalb, Elkhart and 13 more85 min
May 23, 1:15 PM CDTSevere Thunderstorm WatchSPCAdams, Allen, Blackford, Cass, DeKalb, Elkhart and 15 more8 hr
May 23, 3:28 PM CDTSevere Thunderstorm WatchSPCClark, Crawford, Dearborn, Dubois, Fayette, Floyd and 12 more6 hr
May 23, 5:20 PM CDTMesoscale DiscussionSPCClark, Crawford, Dearborn, Decatur, Fayette, Floyd and 15 more55 min
May 23, 5:40 PM CDTMesoscale DiscussionSPCAdams, Allen, Blackford, DeKalb, Grant, Howard and 8 more65 min
May 23, 4:57 PM CDTSevere Thunderstorm WatchSPCAllen, Barren, Butler, Caldwell, Calloway, Christian and 23 more4 hr
May 23, 6:20 PM CDTMesoscale DiscussionSPCBath, Boyd, Breathitt, Carter, Elliott, Estill and 19 more85 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.