Alert archive / Indiana / Mesoscale Discussions in 2003
Mesoscale Discussion 1682
The Storm Prediction Center issued this mesoscale discussion at Jul 7, 2003, 4:34 PM CDT for 4 counties in Illinois; 50 counties in Indiana. It was in force for 56 min.
The area
The outline as issued.
The facts
- Issued
- Jul 7, 2003, 4:34 PM CDT (21:34 UTC)
- Expired
- Jul 7, 2003, 5:30 PM CDT
- In force
- 56 min
- Issued by
- the Storm Prediction Center
All 54 counties
Iroquois County, IL, Kankakee County, IL, Vermilion County, IL, Will County, IL, Allen County, IN, Benton County, IN, Blackford County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, Delaware County, IN, Fayette County, IN, Fountain County, IN, Franklin County, IN, Fulton County, IN, Grant County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Howard County, IN, Huntington County, IN, Jasper County, IN, Jay County, IN, Johnson County, IN, Kosciusko County, IN, Lake County, IN, LaPorte County, IN, Madison County, IN, Marion County, IN, Marshall County, IN, Miami County, IN, Montgomery County, IN, Newton County, IN, Parke County, IN, Porter County, IN, Pulaski County, IN, Putnam County, IN, Randolph County, IN, Rush County, IN, Saint Joseph County, IN, Shelby County, IN, Starke County, IN, Tippecanoe County, IN, Tipton County, IN, Union County, IN, Vermillion County, IN, Wabash County, IN, Warren County, IN, Wayne County, IN, Wells County, IN, White County, IN, Whitley County, IN
The radar
The Indianapolis radar (KIND), 100 km from the middle of the area, began a volume at 21:37 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, 9.6 hours before the alert went out and 165 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.
- Mixed-layer CAPE
- 1626 J/kg
- Mixed-layer CIN
- -70 J/kg
- Mixed-layer LCL
- 1135 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 80 m²/s²
- 0-3 km storm-relative helicity
- 113 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
686 ACUS11 KWNS 072134 SWOMCD SPC MCD 072134 OHZ000-INZ000-ILZ000-072230- MESOSCALE DISCUSSION 1682 NWS STORM PREDICTION CENTER NORMAN OK 0434 PM CDT MON JUL 07 2003 AREAS AFFECTED...NRN IN / NCNTRL IN / ERN IL CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 072134Z - 072230Z EXPECT A CONTINUATION OF RECENT BACKBUILDING TRENDS FROM PARTS OF ECNTRL IN WWD INTO PART OF NRN/NCNTRL IN...POSSIBLY BACK INTO ERN/NERN IL OVER THE NEXT FEW HOURS. A WW ISSUANCE IS POSSIBLE. RECENT VISIBLE IMAGERY SHOWS BACKBUILDING ACTIVITY BEGINNING TO INTENSIFY IN ECNTRL/NCNTRL IN AMIDST A VERY UNSTABLE ATMOSPHERE RECOVERING FROM PREVIOUS MCS FEATURE PRESENTLY IN ERN/SERN OH. STORMS APPEARS TO BE INITIATING ON RATHER SUBTLE REMNANT OUTFLOW BOUNDARY ORIENTED FROM THE SSE TO NNW FROM AROUND MUNCIE TO SOUTH OF THE SOUTH BEND AREA. ANOTHER BOUNDARY IS SEMI DISCERNABLE FROM NEAR COVINGTON OHIO NWWD TO AROUND LAF IN WRN/NWRN IN WHERE WIDESPREAD CUMULUS CONTINUE TO ORGANIZE. STORMS SHOULD CONTINUE TO STRENGTHEN IN THESE AREAS INITIALLY IN THE VICINITIES OF THESE BOUNDARIES GIVEN A VERY/EXTREMELY UNSTABLE BOUNDARY LAYER. WITH 500MB FLOW MORE NWLY AND SSWLY SURFACE LAYER WINDS...0-6KM WIND SHEAR VALUES HAVE INCREASED TO BETWEEN 40-45 KTS...WITH OBJECTIVE ANALYSES INDICATING AROUND 150 SRH VALUES FOR THESE AREAS. GIVEN THE DEGREE OF INSTABILITY AND INCREASING WIND SHEAR IN THESE AREAS IT APPEARS AS IF A TORNADO THREAT IS POSSIBLE INTO THE EARLY EVENING HOURS. OTHERWISE...A LARGE HAIL AND DAMAGING WIND THREAT WITH AREAS OF VERY HEAVY RAINFALL ARE LIKELY FOR SOME OF THESE AREAS AS STORMS WILL CONTINUE EXHIBITING BACKBUILDING CHARACTERISTICS. ..NADEN.. 07/07/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...ILN...IWX...IND...LOT...ILX... 39548706 39958803 40998816 41398805 41778777 41718626 41138508 40058473 39378497
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 8:46 PM CDT | Mesoscale Discussion | SPC | Boone, Cook, DeKalb, DuPage, Ford, Grundy and 10 more | 59 min |
| Jul 7, 1:25 AM CDT | Mesoscale Discussion | SPC | Jo Daviess, Stephenson, Winnebago | 95 min |
| Jul 7, 2:40 AM CDT | Severe Thunderstorm Watch | SPC | Jo Daviess | 4 hr |
| Jul 7, 4:22 AM CDT | Mesoscale Discussion | SPC | Jo Daviess, Stephenson | 83 min |
| Jul 7, 6:23 AM CDT | Mesoscale Discussion | SPC | Bureau, Carroll, DeKalb, Grundy, Henry, Kendall and 9 more | 97 min |
| Jul 7, 8:30 AM CDT | Mesoscale Discussion | SPC | Champaign, DeWitt, Douglas, Ford, Grundy, Iroquois and 13 more | 60 min |
| Jul 7, 8:45 AM CDT | Severe Thunderstorm Watch | SPC | Champaign, Cook, DeWitt, Ford, Grundy, Iroquois and 6 more | 4 hr |
| Jul 7, 10:14 AM CDT | Mesoscale Discussion | SPC | Champaign, DeWitt, Ford, Iroquois, McLean, Piatt and 1 more | 61 min |
| Jul 7, 12:14 PM CDT | Mesoscale Discussion | SPC | Bond, Brown, Cass, Champaign, Christian, Clark and 42 more | 61 min |
| Jul 7, 2:35 PM CDT | Mesoscale Discussion | SPC | Boone, Jo Daviess, McHenry, Stephenson, Winnebago | 115 min |
| Jul 7, 3:35 PM CDT | Severe Thunderstorm Watch | SPC | Rock Island | 5 hr |
| Jul 6, 11:10 PM CDT | Severe Thunderstorm Watch | SPC | Bartholomew, Boone, Brown, Clinton, Dearborn, Decatur and 21 more | 3 hr |
| Jul 6, 11:51 PM CDT | Mesoscale Discussion | SPC | Bartholomew, Boone, Brown, Clinton, Dearborn, Decatur and 21 more | 114 min |
| Jul 7, 11:30 AM CDT | Severe Thunderstorm Watch | SPC | Fayette, Henry, Jay, Randolph, Rush, Union and 1 more | 6 hr |
| Jul 7, 5:30 PM CDT | Tornado Watch | SPC | Adams, Allen, Blackford, Carroll, Cass, Clinton and 28 more | 6 hr |
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.