Alert archive / Indiana / Mesoscale Discussions in 2003
Mesoscale Discussion 1621
The Storm Prediction Center issued this mesoscale discussion at Jul 5, 2003, 5:43 AM CDT for 4 states. It was in force for 92 min.
The area
The outline as issued.
The facts
- Issued
- Jul 5, 2003, 5:43 AM CDT (10:43 UTC)
- Expired
- Jul 5, 2003, 7:15 AM CDT
- In force
- 92 min
- Issued by
- the Storm Prediction Center
All 40 counties
Cook County, IL, Kankakee County, IL, Lake County, IL, Will County, IL, Allen County, IN, DeKalb County, IN, Elkhart County, IN, Fulton County, IN, Jasper County, IN, Kosciusko County, IN, LaGrange County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Newton County, IN, Noble County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, Wabash County, IN, Whitley County, IN, Allegan County, MI, Barry County, MI, Berrien County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Eaton County, MI, Hillsdale County, MI, Ingham County, MI, Jackson County, MI, Kalamazoo County, MI, Lenawee County, MI, Saint Joseph County, MI, Van Buren County, MI, Defiance County, OH, Paulding County, OH, Williams County, OH
The radar
The Northern Indiana radar (KIWX), 49 km from the middle of the area, began a volume at 10:45 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
Detroit, MI (KDTX), launched 00:00Z, 10.7 hours before the alert went out and 253 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
- 604 J/kg
- Mixed-layer CIN
- -123 J/kg
- Mixed-layer LCL
- 1326 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 50 m²/s²
- 0-3 km storm-relative helicity
- 105 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
458 ACUS11 KWNS 051044 SWOMCD SPC MCD 051043 MIZ000-OHZ000-INZ000-ILZ000-WIZ000-051215- MESOSCALE DISCUSSION 1621 NWS STORM PREDICTION CENTER NORMAN OK 0543 AM CDT SAT JUL 05 2003 AREAS AFFECTED...NE IL/S LOWER MI/N IND/NW OH CONCERNING...SEVERE THUNDERSTORM WATCH 642... VALID 051043Z - 051215Z MCS MOVING EWD ACROSS NERN IL WILL CONTINUE TO HAVE A POTENTIAL FOR DAMAGING WINDS AND/OR ISOLATED LARGE HAIL AS IT TRACKS EWD ACROSS NRN IND/SRN LOWER MI. A NEW WW WILL BE ISSUED E OF WW 642 SHORTLY. SEVERE CONVECTIVE CLUSTER WITH EMBEDDED BOW ECHOES IS CURRENTLY JUST N OF AN AREA OF STRONG INSTABILITY WITH MLCAPE VALUES AROUND 2000 J/KG. A BAND OF STRONG MID-LEVEL WINDS EXISTS ACROSS NRN IL WITH ABOUT 40 KT AT 500 MB. AS THE MCS INTERACTS WITH THE INSTABILITY AND SHEAR...A POTENTIAL FOR DAMAGING WINDS AN/OR LARGE HAIL SHOULD CONTINUE AS IT TRACKS EWD ACROSS NWRN-NCNTRL IND. HOWEVER...THE MCS IS MOVING INTO DECREASING LOW-LEVEL MOISTURE WITH SFC DEWPOINTS IN THE MID 60S F. A SHARP INSTABILITY GRADIENT EXISTED E OF THE CLUSTER BECAUSE OF A LARGE COLD OUTFLOW REGION GENERATED BY CONVECTION OVER IND. THIS WILL LIKELY CAUSE THE LINE TO WEAKEN AGAIN SOME AS IT MOVES INTO NERN IND/OH LATER THIS MORNING. HOWEVER...AN ISOLATED DAMAGING WIND GUST POTENTIAL SHOULD EXIST FOR THE NEXT FEW HOURS. ..BROYLES.. 07/05/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...DTX...IWX...GRR...LOT...MKX... 40788629 41028824 42668784 42838616 42568381 40938440
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 8:58 PM CDT | Mesoscale Discussion | SPC | DuPage, Grundy, Iroquois, Kane, Kankakee, Kendall and 1 more | 62 min |
| Jul 4, 10:09 PM CDT | Mesoscale Discussion | SPC | Brown, Cass, Champaign, DeWitt, Douglas, Ford and 20 more | 2 hr |
| Jul 4, 10:45 PM CDT | Mesoscale Discussion | SPC | Jo Daviess, Rock Island | 90 min |
| Jul 4, 11:25 PM CDT | Severe Thunderstorm Watch | SPC | Carroll, Henderson, Henry, Jo Daviess, Knox, Mercer and 6 more | 7 hr |
| Jul 5, 2:31 AM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 27 more | 89 min |
| Jul 5, 3:40 AM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Cook, DeKalb, DuPage, Grundy and 11 more | 4 hr |
| Jul 5, 12:55 PM CDT | Mesoscale Discussion | SPC | Champaign, Christian, Clark, Coles, Crawford, Cumberland and 14 more | 3 hr |
| Jul 5, 4:34 PM CDT | Mesoscale Discussion | SPC | Champaign, Ford, Iroquois, Vermilion | 56 min |
| Jul 5, 5:18 PM CDT | Mesoscale Discussion | SPC | Cass, DeWitt, Fulton, Hancock, Henderson, Henry and 16 more | 57 min |
| Jul 5, 5:55 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Cass, Champaign, Christian, Clark and 36 more | 6 hr |
| Jul 5, 6:00 AM CDT | Severe Thunderstorm Watch | SPC | Elkhart, LaGrange, LaPorte, Porter, Saint Joseph, Steuben | 3 hr |
| Jul 5, 7:12 AM CDT | Mesoscale Discussion | SPC | Adams, Allen, DeKalb, Elkhart, Fulton, Huntington and 10 more | 93 min |
| Jul 5, 4:55 PM CDT | Severe Thunderstorm Watch | SPC | Bartholomew, Benton, Boone, Brown, Carroll, Clay and 35 more | 4 hr |
Nearby
Mesoscale Discussions in Indiana, 2003Mesoscale Discussions in Michigan, 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.