Alert archive / Indiana / Mesoscale Discussions in 2003

Mesoscale Discussion 907

May 10, 200311 counties in Illinois; 34 counties in Indiana

The Storm Prediction Center issued this mesoscale discussion at May 10, 2003, 10:39 AM CDT for 11 counties in Illinois; 34 counties in Indiana. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 10, 2003, 10:39 AM CDT (15:39 UTC)
Expired
May 10, 2003, 12:45 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 45 counties

Clark County, IL, Clay County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Jasper County, IL, Lawrence County, IL, Richland County, IL, Bartholomew County, IN, Boone County, IN, Brown County, IN, Clay County, IN, Daviess County, IN, Decatur County, IN, Delaware County, IN, Fountain County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Johnson County, IN, Knox County, IN, Lawrence County, IN, Madison County, IN, Marion County, IN, Martin County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Owen County, IN, Parke County, IN, Putnam County, IN, Rush County, IN, Scott County, IN, Shelby County, IN, Sullivan County, IN, Vermillion County, IN, Vigo County, IN

The radar

The Indianapolis radar (KIND), 106 km from the middle of the area, began a volume at 15:39 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, 3.7 hours before the alert went out and 135 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 2003-05-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 474 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 2003-05-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 106 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
474 J/kg
Mixed-layer CIN
-156 J/kg
Mixed-layer LCL
763 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
106 m²/s²
0-3 km storm-relative helicity
168 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

Open this sounding in Storm Lab

The text

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

213 
ACUS11 KWNS 101540
SWOMCD
SPC MCD 101539 
INZ000-KYZ000-ILZ000-101745-

MESOSCALE DISCUSSION 0907
NWS STORM PREDICTION CENTER NORMAN OK
1039 AM CDT SAT MAY 10 2003

AREAS AFFECTED...ECENTRAL IL...CENTRAL IND

CONCERNING...TORNADO WATCH 335...

VALID 101539Z - 101745Z

TORNADIC SUPERCELL OVER NRN PUTNAM COUNTY WILL CONTINUE TO TRACK
ENEWD AROUND 20 KTS THROUGH 17/00Z ALONG AN ADVANCING WARM FRONT
ACROSS HENDRICKS AND INTO NRN MARION/SRN HAMILTON COUNTIES.
ADDITIONAL SUPERCELL DEVELOPMENT WITH AN ATTENDANT RISK FOR
TORNADOES WILL BE POSSIBLE OVER THE ERN INDIANAPOLIS METRO AREA EWD
INTO ECENTRAL IND ALONG THE WARM FRONT OVER THE NEXT FEW HOURS.
FARTHER WEST...WELL DEFINED MCV WILL SUSTAIN SEVERE CONVECTIVE
THREAT OVER ECENTRAL IL INTO WCENTRAL IND THROUGH 03/17Z. STRONG LOW
LEVEL SHEAR /250-300 M2/S2 0-2 KM HELICITY ON RECENT PAH VWP/ WILL
SUPPORT THE THREAT FOR ISOLATED TORNADOES WITH THIS ACTIVITY.
HOWEVER STRONG PRESSURE RISES BEHIND THE CONVECTION WILL SUPPORT A
WELL ORGANIZED OUTFLOW WITH STRONG DAMAGING WINDS THE PRIMARY THREAT
WITH THIS ACTIVITY.

..CROSBIE.. 05/10/2003

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

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

38708876 39558872 40258749 40248539 38658541

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 9, 7:47 PM CDTMesoscale DiscussionSPCCalhoun, Greene, Morgan, Pike, Scott88 min
May 9, 8:40 PM CDTMesoscale DiscussionSPCBond, Champaign, Christian, Clark, Clinton, Coles and 18 more2 hr
May 9, 10:04 PM CDTMesoscale DiscussionSPCAdams26 min
May 9, 10:40 PM CDTSevere Thunderstorm WatchSPCBrown, Cass, Champaign, DeWitt, Ford, Fulton and 22 more5 hr
May 10, 5:43 AM CDTMesoscale DiscussionSPCAdams, Brown, Calhoun, Cass, Christian, Fulton and 15 more92 min
May 10, 5:50 AM CDTSevere Thunderstorm WatchSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 25 more5 hr
May 10, 8:30 AM CDTTornado WatchSPCChampaign, Clark, Clay, Coles, Crawford, Cumberland and 9 more6 hr
May 10, 9:25 AM CDTMesoscale DiscussionSPCEdwards, Franklin, Gallatin, Hamilton, Hardin, Jackson and 14 more2 hr
May 10, 10:54 AM CDTMesoscale DiscussionSPCAdams, Alexander, Bond, Brown, Calhoun, Cass and 69 more66 min
May 10, 12:38 PM CDTMesoscale DiscussionSPCClay, Crawford, Jasper, Lawrence, Richland97 min
May 10, 3:17 PM CDTMesoscale DiscussionSPCHancock, Henderson, Mercer, Rock Island58 min
May 10, 3:50 PM CDTTornado WatchSPCBureau, Carroll, Fulton, Henderson, Henry, Jo Daviess and 14 more6 hr
May 10, 4:00 PM CDTTornado WatchSPCFranklin, Jackson, Perry, Randolph, Union5 hr
May 10, 4:48 PM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 25 more87 min
May 10, 5:40 PM CDTTornado WatchSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 21 more5 hr
May 10, 6:41 PM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 14 more64 min
May 10, 3:33 AM CDTMesoscale DiscussionSPCBartholomew, Boone, Brown, Clark, Crawford, Daviess and 41 more87 min
May 10, 11:00 AM CDTTornado WatchSPCBlackford, Dearborn, Delaware, Fayette, Franklin, Henry and 7 more5 hr
May 10, 1:04 PM CDTMesoscale DiscussionSPCBlackford, Dearborn, Delaware, Fayette, Franklin, Henry and 7 more86 min

Nearby

Mesoscale Discussions in Indiana, 2003Mesoscale Discussions in Illinois, 2003Every mesoscale discussion in 2003

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.