Alert archive / Indiana / Mesoscale Discussions in 2003
Mesoscale Discussion 375
The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2003, 1:29 PM CST for 4 states. It was in force for 91 min.
The area
The outline as issued.
The facts
- Issued
- Apr 4, 2003, 1:29 PM CST (19:29 UTC)
- Expired
- Apr 4, 2003, 3:00 PM CST
- In force
- 91 min
- Issued by
- the Storm Prediction Center
All 50 counties
Bureau County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, LaSalle County, IL, Lee County, IL, Marshall County, IL, Putnam County, IL, Stark County, IL, Will County, IL, Adams County, IN, Allen County, IN, DeKalb County, IN, Elkhart County, IN, Fulton County, IN, Huntington 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, Wells County, IN, Whitley County, IN, Berrien County, MI, Branch County, MI, Cass County, MI, Saint Joseph County, MI, Allen County, OH, Defiance County, OH, Fulton County, OH, Hancock County, OH, Henry 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), 61 km from the middle of the area, began a volume at 19:29 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, 7.5 hours before the alert went out and 231 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
- 60 J/kg
- Mixed-layer CIN
- -17 J/kg
- Mixed-layer LCL
- 622 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- -8 m²/s²
- 0-3 km storm-relative helicity
- 91 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
630 ACUS11 KWNS 041930 SWOMCD SPC MCD 041929 OHZ000-MIZ000-INZ000-ILZ000-042100- MESOSCALE DISCUSSION 0375 NWS STORM PREDICTION CENTER NORMAN OK 0129 PM CST FRI APR 04 2003 AREAS AFFECTED...NRN IL...NRN IND...EXTREME SRN LOWER MI AND NWRN OH CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 041929Z - 042100Z ...ISOLD LARGE HAIL IS LIKELY ACROSS THE AREA THIS AFTERNOON... A WW PROBABLY WILL NOT BE NEEDED GIVEN ISOLD NATURE OF THE SEVERE POTENTIAL. ELEVATED TSTMS HAVE INCREASED OVER THE PAST COUPLE OF HOURS ACROSS NRN IL EWD INTO NRN IND AND EXTREME NWRN OH...LIKELY AIDED BY INCREASING LARGE SCALE ASCENT IN EXIT REGION OF A APPROACHING MIDLEVEL JETLET. PARCELS THAT ARE CONVECTING ATOP THE COLD DOME ARE MORE THAN LIKELY ORIGINATING FROM THE UNSTABLE AIR MASS UPSTREAM ACROSS MO/DOWNSTATE IL WHERE MUCAPES ARE APPROACHING 2000 J/KG. THE STORMS APPEAR TO REACH PEAK INTENSITY AS THEY APPROACH AND CROSS THE STATIONARY FRONT SITUATED FROM NRN IL INTO NRN IND AND NWRN OH. THUS...GIVEN STEEP MIDLEVEL LAPSE RATES...COLD COLUMN AND FAVORABLE SHEAR IN THE CAPE BEARING LAYER...A FEW ORGANIZED TSTMS HAVE RESULTED. LARGE HAIL WILL BE THE PRIMARY THREAT...BUT RELATIVELY ISOLD ENOUGH TO NOT INCLUDE IN A SEVERE THUNDERSTORM WATCH. THE GREATER SEVERE THREAT WILL EXIST FARTHER SOUTH ACROSS CNTRL/SRN PARTS OF IND/IL AND SWRN OH. ..RACY.. 04/04/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...CLE...ILN...DTX...IWX...GRR...LOT...ILX...DVN... 42208753 42118628 42048537 41768399 41508331 40688354 40648498 40748562 40918693 41038872 40848986 41768986
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 4, 7:23 AM CST | Mesoscale Discussion | SPC | Adams, Bond, Brown, Calhoun, Cass, Champaign and 55 more | 97 min |
| Apr 4, 9:47 AM CST | Mesoscale Discussion | SPC | Clark, Coles, Crawford, Cumberland, Douglas, Edgar and 9 more | 58 min |
| Apr 4, 11:10 AM CST | Mesoscale Discussion | SPC | Bond, Calhoun, Cass, Champaign, Christian, Clinton and 24 more | 95 min |
| Apr 4, 12:05 PM CST | Tornado Watch | SPC | Adams, Brown, Calhoun, Cass, Greene, Jersey and 10 more | 5 hr |
| Apr 4, 1:12 PM CST | Mesoscale Discussion | SPC | Bond, Brown, Calhoun, Cass, Champaign, Christian and 35 more | 93 min |
| Apr 4, 2:35 PM CST | Tornado Watch | SPC | Bond, Champaign, Christian, Clark, Clay, Clinton and 26 more | 5 hr |
| Apr 4, 3:10 PM CST | Mesoscale Discussion | SPC | Bond, Champaign, Christian, Clark, Coles, Cumberland and 25 more | 2 hr |
| Apr 4, 4:25 PM CST | Tornado Watch | SPC | Alexander, Bond, Clay, Clinton, Edwards, Franklin and 24 more | 6 hr |
| Apr 4, 5:11 PM CST | Mesoscale Discussion | SPC | Bond, Champaign, Christian, Clark, Clay, Clinton and 24 more | 2 hr |
| Apr 3, 10:43 PM CST | Mesoscale Discussion | SPC | Barry, Clinton, Eaton, Genesee, Ingham, Ionia and 7 more | 5 hr |
Nearby
Mesoscale Discussions in Indiana, 2003Mesoscale Discussions in Illinois, 2003Mesoscale Discussions in Ohio, 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.