Alert archive / Indiana / Mesoscale Discussions in 2003

Mesoscale Discussion 658

May 1, 20035 states

The Storm Prediction Center issued this mesoscale discussion at May 1, 2003, 7:51 AM CDT for 5 states. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued
May 1, 2003, 7:51 AM CDT (12:51 UTC)
Expired
May 1, 2003, 9:45 AM CDT
In force
114 min
Issued by
the Storm Prediction Center
All 70 counties

Baxter County, AR, Clay County, AR, Fulton County, AR, Izard County, AR, Randolph County, AR, Searcy County, AR, Sharp County, AR, Alexander County, IL, Crawford County, IL, Edwards County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Johnson County, IL, Lawrence County, IL, Massac County, IL, Pope County, IL, Pulaski County, IL, Richland County, IL, Saline County, IL, Union County, IL, Wabash County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Bartholomew County, IN, Brown County, IN, Clay County, IN, Daviess County, IN, Dubois County, IN, Gibson County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Johnson County, IN, Knox County, IN, Lawrence County, IN, Madison County, IN, Marion County, IN, Martin County, IN, Monroe County, IN, Morgan County, IN, Owen County, IN, Pike County, IN, Posey County, IN, Putnam County, IN, Rush County, IN, Shelby County, IN, Sullivan County, IN, Vanderburgh County, IN, Warrick County, IN, Ballard County, KY, Carlisle County, KY, Livingston County, KY, McCracken County, KY, Union County, KY, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, Mississippi County, MO, New Madrid County, MO, Oregon County, MO, Ripley County, MO, Scott County, MO, Stoddard County, MO, Wayne County, MO

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, 0.9 hours before the alert went out and 242 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 2003-05-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 24 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 2003-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 72 square meters per square second.193958Sfc1 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
24 J/kg
Mixed-layer CIN
-410 J/kg
Mixed-layer LCL
1510 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
72 m²/s²
0-3 km storm-relative helicity
72 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.

075 
ACUS11 KWNS 011251
SWOMCD
SPC MCD 011251 
INZ000-KYZ000-ILZ000-MOZ000-TNZ000-ARZ000-011445-

MESOSCALE DISCUSSION 0658
NWS STORM PREDICTION CENTER NORMAN OK
0751 AM CDT THU MAY 01 2003

AREAS AFFECTED...NERN AR....SERN MO...SRN IL/IND

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 011251Z - 011445Z

TSTM INTENSITY WILL LIKELY INCREASE BY LATE MORNING ALONG AND EAST
OF CURRENT OUTFLOW BOUNDARY SITUATED FROM S-CNTRL IND SWWD INTO SERN
MO AND NERN AR. A SEVERE TSTM WATCH MAY BE NEEDED ACROSS PORTIONS OF
THIS AREA BEFORE NOON CDT.

EARLY MORNING VISIBLE SATELLITE IMAGES DEPICT PARTLY CLOUDY SKIES
ACROSS SRN IL/IND AHEAD OF CONVECTIVE OUTFLOW FROM OVERNIGHT
CONVECTION. FARTHER SOUTHWEST...ONGOING STRONG MCS MOVING ACROSS SRN
MO/NRN AR WILL CONTINUE TO MOVE INTO INSTABILITY AXIS ACROSS THE
MIDDLE MS VALLEY AREA WITH LARGE SCALE ASCENT OVER THIS AREA AIDED
BY SHORTWAVE TROUGH CROSSING WRN OK.

AS HEATING COMMENCES FROM THE MS VALLEY NEWD INTO THE LOWER OH
VALLEY...ABUNDANT SURFACE MOISTURE AND RELATIVELY STEEP LAPSE RATES 
WILL CONTRIBUTE TO THE DEVELOPMENT OF MODEST INSTABILITY /MLCAPE AOA
1000 J/KG/. TSTMS SHOULD INTENSIFY LATER THIS MORNING AS THIS
INSTABILITY IS REALIZED. COUPLED WITH GRADUALLY STRENGTHENING
MIDLEVEL FLOW DEVELOPING OVER THE AREA AS UPPER TROUGH TRANSLATES
EWD...STORMS SHOULD ORGANIZE INTO LINES/BOWS WITH INCREASING
POTENTIAL FOR WIND DAMAGE AND HAIL.

..CARBIN.. 05/01/2003

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

ATTN...WFO...ILN...LMK...IND...PAH...ILX...MEG...LZK...SGF...

36548923 35689301 36579209 37348990 38148909 39078791
40118635 40258520 39568531

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 1, 9:35 AM CDTSevere Thunderstorm WatchSPCClay, Craighead, Greene5 hr
May 1, 11:23 AM CDTMesoscale DiscussionSPCCrittenden, Cross, Mississippi, St. Francis2 hr
May 1, 2:13 PM CDTMesoscale DiscussionSPCHoward, Little River, Polk, Scott, Sevier3 hr
May 1, 2:55 PM CDTTornado WatchSPCLittle River5 hr
May 1, 3:45 PM CDTTornado WatchSPCBenton, Carroll, Crawford, Franklin, Howard, Johnson and 9 more5 hr
May 1, 6:10 PM CDTMesoscale DiscussionSPCArkansas, Dallas, Hempstead, Jefferson, Lee, Little River and 3 more95 min
May 1, 6:58 PM CDTMesoscale DiscussionSPCBenton, Carroll, Crawford, Franklin, Hempstead, Howard and 10 more92 min
Apr 30, 7:31 PM CDTMesoscale DiscussionSPCAdams, Bureau, Cook, DeKalb, DuPage, Grundy and 21 more119 min
Apr 30, 10:31 PM CDTMesoscale DiscussionSPCAdams, Bureau, Cook, DeKalb, DuPage, Grundy and 21 more89 min
Apr 30, 10:55 PM CDTSevere Thunderstorm WatchSPCAdams, Brown, Cass, DeWitt, Ford, Fulton and 22 more5 hr
May 1, 1:19 AM CDTMesoscale DiscussionSPCAdams, Brown, Cass, DeWitt, Ford, Fulton and 18 more86 min
May 1, 12:15 PM CDTSevere Thunderstorm WatchSPCGallatin, Hardin5 hr
May 1, 12:09 PM CDTMesoscale DiscussionSPCAdams, Allen, Blackford, Boone, Carroll, Cass and 26 more3 hr
May 1, 12:50 PM CDTSevere Thunderstorm WatchSPCAdams, Bartholomew, Blackford, Boone, Brown, Clay and 43 more5 hr
May 1, 3:10 PM CDTMesoscale DiscussionSPCAdams, Bartholomew, Blackford, Boone, Brown, Clay and 35 more95 min
May 1, 2:35 PM CDTSevere Thunderstorm WatchSPCAdair, Allen, Anderson, Barren, Bath, Bourbon and 53 more5 hr
May 1, 5:11 PM CDTMesoscale DiscussionSPCAdair, Allen, Anderson, Barren, Bath, Boone and 52 more94 min
Apr 30, 9:22 PM CDTMesoscale DiscussionSPCBarton, Bates, Benton, Camden, Cass, Cedar and 19 more83 min
Apr 30, 9:30 PM CDTSevere Thunderstorm WatchSPCBarton, Bates, Benton, Camden, Carroll, Cass and 25 more6 hr
May 1, 12:00 AM CDTMesoscale DiscussionSPCBarton, Bates, Benton, Camden, Carroll, Cass and 24 more90 min
May 1, 2:27 AM CDTMesoscale DiscussionSPCBarry, Barton, Bates, Benton, Camden, Cedar and 17 more2 hr

Nearby

Mesoscale Discussions in Indiana, 2003Mesoscale Discussions in Illinois, 2003Mesoscale Discussions in Missouri, 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.