Alert archive / Indiana / Mesoscale Discussions in 2004
Mesoscale Discussion 1749
The Storm Prediction Center issued this mesoscale discussion at Jul 21, 2004, 10:18 AM CDT for 4 states. It was in force for 87 min.
The area
The outline as issued.
The facts
- Issued
- Jul 21, 2004, 10:18 AM CDT (15:18 UTC)
- Expired
- Jul 21, 2004, 11:45 AM CDT
- In force
- 87 min
- Issued by
- the Storm Prediction Center
All 82 counties
Bureau County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Ford County, IL, Grundy County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, Ogle County, IL, Putnam County, IL, Stark County, IL, Will County, IL, Woodford County, IL, Adams County, IN, Allen County, IN, Benton County, IN, Blackford County, IN, Carroll County, IN, Cass County, IN, DeKalb County, IN, Elkhart County, IN, Fulton County, IN, Grant County, IN, Howard County, IN, Huntington County, IN, Jasper County, IN, Kosciusko County, IN, LaGrange County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Miami 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, Wells County, IN, White County, IN, Whitley County, IN, Allegan County, MI, Barry County, MI, Berrien County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Clinton County, MI, Eaton County, MI, Hillsdale County, MI, Ingham County, MI, Ionia County, MI, Jackson County, MI, Kalamazoo County, MI, Lenawee County, MI, Livingston County, MI, Monroe County, MI, Oakland County, MI, Saint Joseph County, MI, Shiawassee County, MI, Van Buren County, MI, Washtenaw County, MI, Wayne County, MI, Defiance County, OH, Fulton County, OH, Henry County, OH, Lucas County, OH, Mercer County, OH, Paulding County, OH, Putnam County, OH, Van Wert County, OH, Williams County, OH, Wood County, OH
The radar
The Northern Indiana radar (KIWX), 82 km from the middle of the area, began a volume at 15:18 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 nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 3.3 hours before the alert went out and 235 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
- 1988 J/kg
- Mixed-layer CIN
- -181 J/kg
- Mixed-layer LCL
- 825 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 54 m²/s²
- 0-3 km storm-relative helicity
- 158 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
707 ACUS11 KWNS 211518 SWOMCD SPC MCD 211518 OHZ000-MIZ000-INZ000-ILZ000-211645- MESOSCALE DISCUSSION 1749 NWS STORM PREDICTION CENTER NORMAN OK 1018 AM CDT WED JUL 21 2004 AREAS AFFECTED...NERN/ECNTRL IL...NRN THIRD OF IND...NWRN OH AND SRN LOWER MI CONCERNING...OUTLOOK UPGRADE VALID 211518Z - 211645Z PARTS OF NERN/ECNTRL IL...THE NRN THIRD OF IND...NWRN OH AND SRN LOWER MI WILL BE UPGRADED TO A MODERATE RISK ON THE 1630Z DAY 1 UPDATE. 18Z SOUNDINGS HAVE BEEN REQUESTED AT ILX/APX/DTX. WELL-DEFINED MCV CONTINUES TO MOVE ACROSS SRN IA AND PROFILERS/VWP SHOW 30-40 KT MIDLEVEL FLOW ASSOCIATED WITH THE FEATURE. TSTMS HAVE ALREADY DEVELOPED ACROSS PARTS OF CNTRL/SRN IA AND NRN IL AND WILL LIKELY INCREASE AS BOUNDARY LAYER HEATING CONTINUES. THESE TSTMS WILL BE EMBEDDED IN INCREASING WLY FLOW REGIME AS THE MCV TRACKS EWD THIS AFTERNOON. THUS...THERE WILL BE A POTENTIAL FOR ONE OR MORE BOW ECHOES TO EVOLVE ACROSS THE CNTRL GREAT LAKES AND UPPER MIDWEST. HIGHEST WIND DAMAGE POTENTIAL...WITH SOME GUSTS EXCEEDING 70 KTS...WILL BE ACROSS THE MODERATE RISK AREA. ..RACY.. 07/21/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...CLE...ILN...DTX...IWX...GRR...IND...LOT...ILX...DVN... 42038970 43088445 42568305 41538319 40508444 40348846 41048991
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 7:53 AM CDT | Mesoscale Discussion | SPC | Boone, DuPage, Kane, Lake, McHenry, Stephenson and 1 more | 2 hr |
| Jul 21, 9:03 AM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Champaign, Cook, DeKalb and 37 more | 117 min |
| Jul 21, 9:35 AM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 26 more | 5 hr |
| Jul 21, 1:01 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 25 more | 89 min |
| Jul 21, 2:35 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Cook, DeKalb, DeWitt, DuPage and 20 more | 6 hr |
| Jul 21, 5:09 PM CDT | Mesoscale Discussion | SPC | Bureau, DeWitt, Ford, Grundy, Iroquois, Kankakee and 13 more | 36 min |
| Jul 21, 6:20 PM CDT | Mesoscale Discussion | SPC | Clark, Coles, Edgar, Vermilion | 25 min |
| Jul 21, 6:35 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Allen, Benton, Blackford, Boone, Carroll and 30 more | 5 hr |
| Jul 21, 11:10 AM CDT | Mesoscale Discussion | SPC | Alpena, Antrim, Arenac, Bay, Benzie, Cheboygan and 24 more | 2 hr |
Nearby
Mesoscale Discussions in Indiana, 2004Mesoscale Discussions in Michigan, 2004Mesoscale Discussions in Illinois, 2004Every mesoscale discussion in 2004
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.