Alert archive / Indiana / Mesoscale Discussions in 2011

Mesoscale Discussion 950

May 25, 201124 counties in Illinois; 41 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at May 25, 2011, 7:48 AM CDT for 24 counties in Illinois; 41 counties in Indiana. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
May 25, 2011, 7:48 AM CDT (12:48 UTC)
Expired
May 25, 2011, 9:15 AM CDT
In force
87 min
Issued by
the Storm Prediction Center
All 65 counties

Champaign County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Fayette County, IL, Ford County, IL, Iroquois County, IL, Jasper County, IL, Kankakee County, IL, Lawrence County, IL, Marion County, IL, Moultrie County, IL, Piatt County, IL, Richland County, IL, Saint Clair County, IL, Shelby County, IL, Vermilion County, IL, Washington County, IL, Benton County, IN, Boone County, IN, Brown County, IN, Carroll County, IN, Cass County, IN, Clay County, IN, Clinton County, IN, Fountain County, IN, Fulton County, IN, Grant County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Howard County, IN, Huntington County, IN, Jasper County, IN, Johnson County, IN, Kosciusko County, IN, Madison County, IN, Marion County, IN, Marshall County, IN, Miami County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Newton County, IN, Owen County, IN, Parke County, IN, Pulaski County, IN, Putnam County, IN, Shelby County, IN, Starke County, IN, Sullivan County, IN, Tippecanoe County, IN, Tipton County, IN, Vermillion County, IN, Vigo County, IN, Wabash County, IN, Warren County, IN, White County, IN

The radar

The Lincoln radar (KILX), 118 km from the middle of the area, began a volume at 12:51 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 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, 0.8 hours before the alert went out and 60 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 2011-05-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1832 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 2011-05-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 253 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
1832 J/kg
Mixed-layer CIN
-18 J/kg
Mixed-layer LCL
561 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
253 m²/s²
0-3 km storm-relative helicity
222 m²/s²
Significant tornado parameter
1.6
Supercell composite
10.1

Open this sounding in Storm Lab

The text

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

499 
ACUS11 KWNS 251249
SWOMCD
SPC MCD 251248
INZ000-ILZ000-251415-

MESOSCALE DISCUSSION 0950
NWS STORM PREDICTION CENTER NORMAN OK
0748 AM CDT WED MAY 25 2011

AREAS AFFECTED...SOUTHERN/EASTERN IL INTO INDIANA

CONCERNING...TORNADO WATCH 367...

VALID 251248Z - 251415Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 367 CONTINUES.

TORNADO WATCH 367 CONTINUES UNTIL 18Z...WITH THE PRIMARY SEVERE
THREAT ACROSS SOUTHERN/EASTERN IL THIS MORNING. DOWNSTREAM OF WW
367...A SEVERE THREAT WILL LIKELY INCREASE ACROSS PORTIONS OF
INDIANA RELATIVELY EARLY TODAY...SUCH THAT A WATCH MAY BE NEEDED.

FRAGMENTED QUASI-LINEAR CONVECTIVE CLUSTERS CONTINUE TO STEADILY
RACE EAST-NORTHEASTWARD ACROSS SOUTH-CENTRAL AND
EAST-CENTRAL/NORTHEAST IL JUST AFTER DAYBREAK. WITHIN A VERY
STRONG/DEEP LAYER WIND FIELD...ISOLATED BOUTS OF DAMAGING
WINDS/SMALL AND PERHAPS A TORNADO REMAIN POSSIBLE IN THE SHORT
TERM...WITH HEATING OF THE DAY EXPECTED TO ONLY REINVIGORATE THE
SEVERE THREAT BY LATE MORNING/MIDDAY...POTENTIALLY INTO PORTIONS OF
INDIANA. ALONG THESE LINES...A 43 KT GUST WAS RECENTLY MEASURED IN
DECATUR IL. THE 12Z OBSERVED RAOB FROM LINCOLN IL WAS INDICATIVE OF
VERY STEEP LAPSE RATES ALOFT /IN EXCESS OF 7 C PER KM IN THE MID
LEVELS/ AND AMPLE MOISTURE WITH MUCAPE ON THE ORDER 2800
J/KG...WHICH WILL BECOME INCREASINGLY REALIZED FOR SURFACE BASED
PARCELS AS THE BOUNDARY LAYER HEATS.

..GUYER.. 05/25/2011

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

ATTN...WFO...IWX...IND...PAH...LOT...ILX...LSX...

LAT...LON   40538877 41098841 41588660 41318563 40608537 39228590
            38358881 38118971 38429009 39058913 39788875 40538877

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 25, 12:48 AM CDTMesoscale DiscussionSPCAdams, Alexander, Bond, Brown, Calhoun, Cass and 23 more57 min
May 25, 1:22 AM CDTTornado WatchSPCAdams, Brown, Calhoun, Cass, Fulton, Greene and 16 more7 hr
May 25, 4:58 AM CDTMesoscale DiscussionSPCBond, Brown, Calhoun, Cass, Champaign, Christian and 45 more92 min
May 25, 5:46 AM CDTTornado WatchSPCBond, Champaign, Christian, Clark, Clay, Clinton and 35 more7 hr
May 25, 7:31 AM CDTMesoscale DiscussionSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more59 min
May 25, 8:33 AM CDTMesoscale DiscussionSPCChampaign, DeWitt, Douglas, Edgar, Ford, Iroquois and 3 more87 min
May 25, 10:18 AM CDTMesoscale DiscussionSPCBond, Clark, Clay, Clinton, Crawford, Cumberland and 12 more57 min
May 25, 10:37 AM CDTTornado WatchSPCAdams, Brown, Pike7 hr
May 25, 11:02 AM CDTMesoscale DiscussionSPCAlexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 13 more28 min
May 25, 11:09 AM CDTTornado Watch PDSSPCAlexander, Bond, Calhoun, Christian, Clark, Clay and 41 more10 hr
May 25, 2:31 PM CDTTornado WatchSPCBureau, Cass, Champaign, DeKalb, DeWitt, Ford and 33 more7 hr
May 25, 2:32 PM CDTMesoscale DiscussionSPCCalhoun, Greene, Jersey, Macoupin, Pike, Scott58 min
May 25, 3:10 PM CDTMesoscale DiscussionSPCAlexander, Franklin, Gallatin, Hardin, Jackson, Johnson and 6 more95 min
May 25, 5:48 PM CDTMesoscale DiscussionSPCBureau, Champaign, DeKalb, DeWitt, Douglas, Ford and 19 more117 min
May 25, 6:25 PM CDTMesoscale DiscussionSPCAlexander, Clay, Clinton, Edwards, Franklin, Gallatin and 20 more2 hr
May 25, 8:50 AM CDTTornado WatchSPCAdams, Allen, Bartholomew, Blackford, Boone, Brown and 57 more9 hr
May 25, 12:26 PM CDTMesoscale DiscussionSPCAdams, Allen, Blackford, DeKalb, Delaware, Grant and 16 more94 min
May 25, 12:55 PM CDTTornado WatchSPCDearborn, Fayette, Franklin, Ohio, Ripley, Switzerland and 2 more8 hr
May 25, 5:19 PM CDTMesoscale DiscussionSPCBartholomew, Blackford, Boone, Brown, Clay, Clinton and 45 more86 min
May 25, 5:44 PM CDTTornado Watch PDSSPCAdams, Bartholomew, Blackford, Boone, Brown, Carroll and 45 more6 hr

Nearby

Mesoscale Discussions in Indiana, 2011Mesoscale Discussions in Illinois, 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.