Alert archive / Indiana / Mesoscale Discussions in 2011
Mesoscale Discussion 1014
The Storm Prediction Center issued this mesoscale discussion at May 29, 2011, 11:59 AM CDT for 4 states. It was in force for 61 min.
The area
The outline as issued.
The facts
- Issued
- May 29, 2011, 11:59 AM CDT (16:59 UTC)
- Expired
- May 29, 2011, 1:00 PM CDT
- In force
- 61 min
- Issued by
- the Storm Prediction Center
All 69 counties
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, LaSalle County, IL, Livingston County, IL, McLean County, IL, Tazewell County, IL, Will County, IL, Woodford County, IL, Adams County, IN, Allen County, IN, Benton County, IN, Carroll County, IN, Cass 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, 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, 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, Livingston County, MI, Monroe County, MI, Saint Joseph County, MI, Van Buren County, MI, Washtenaw County, MI, Wayne County, MI, Defiance County, OH, Fulton County, OH, Henry County, OH, Lucas County, OH, Ottawa 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), 31 km from the middle of the area, began a volume at 17:02 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, 5.0 hours before the alert went out and 257 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
- 2176 J/kg
- Mixed-layer CIN
- -63 J/kg
- Mixed-layer LCL
- 571 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 178 m²/s²
- 0-3 km storm-relative helicity
- 197 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 11.5
The text
As transmitted, in the capitals the NWS used until 2016.
457
ACUS11 KWNS 291700
SWOMCD
SPC MCD 291659
OHZ000-MIZ000-INZ000-ILZ000-291800-
MESOSCALE DISCUSSION 1014
NWS STORM PREDICTION CENTER NORMAN OK
1159 AM CDT SUN MAY 29 2011
AREAS AFFECTED...NRN IL...NRN IND...SRN LOWER MI...NWRN OH
CONCERNING...SEVERE THUNDERSTORM WATCH 394...
VALID 291659Z - 291800Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 394
CONTINUES.
BOWING QLCS OVER N-CNTRL IL WILL LIKELY TRACK EWD ACROSS PORTIONS OF
NRN IND...SRN LOWER MI AND NWRN OH THIS AFTERNOON. A DOWNSTREAM WW
WILL BE ISSUED BY 18Z.
RECENT FORWARD PROPAGATION SPEED OF 45-50 KT WITH THE BOWING SEGMENT
MOVING ACROSS N-CNTRL IL WOULD EXTRAPOLATE TO THE ERN EDGE OF WW 394
AROUND 19Z. DOWNSTREAM AIR MASS CONTINUES TO HEAT AND DESTABILIZE
WITH WARM FRONT /ROUGHLY FROM 20 S VPZ TO DTW/ GRADUALLY SHIFTING
NWD . MODIFIED 12Z ILX RAOB SUGGESTS THE PRESENCE OF STRONG
INSTABILITY /MLCAPE RISING AOA 2000 J/KG/ ALONG WITH 40-50 KT
EFFECTIVE SHEAR WILL MAINTAIN POTENTIAL FOR WIDESPREAD DAMAGING
WINDS. ALTHOUGH LOW-LEVEL SHEAR SHOULD REMAIN MODEST...THE PRESENCE
OF A WELL-DEVELOPED BOWING STRUCTURE ALONG WITH THE WARM/MOIST
BOUNDARY LAYER COULD FAVOR BRIEF TORNADOES AS WELL.
..GRAMS.. 05/29/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...CLE...DTX...IWX...GRR...IND...LOT...ILX...DVN...
LAT...LON 40488984 41258910 41858901 42498621 42698370 42508312
41828283 41418308 40998375 40658538 40528689 40488984SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 29, 8:39 AM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 26 more | 66 min |
| May 29, 8:53 AM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 33 more | 6 hr |
| May 29, 12:29 PM CDT | Tornado Watch | SPC | Adams, Allen, Blackford, Cass, DeKalb, Elkhart and 18 more | 7 hr |
| May 29, 3:17 PM CDT | Mesoscale Discussion | SPC | Allen, DeKalb, LaGrange, Noble, Steuben | 88 min |
| May 29, 5:51 PM CDT | Mesoscale Discussion | SPC | Genesee, Lapeer, Lenawee, Livingston, Macomb, Monroe and 8 more | 54 min |
| May 29, 5:05 PM CDT | Mesoscale Discussion | SPC | Ashland, Ashtabula, Cuyahoga, Geauga, Lake, Lorain and 5 more | 25 min |
| May 29, 5:17 PM CDT | Severe Thunderstorm Watch | SPC | Ashtabula, Cuyahoga, Erie, Geauga, Huron, Lake and 5 more | 5 hr |
| May 29, 6:28 PM CDT | Mesoscale Discussion | SPC | Ashtabula, Cuyahoga, Erie, Geauga, Huron, Lake and 5 more | 62 min |
Nearby
Mesoscale Discussions in Indiana, 2011Mesoscale Discussions in Michigan, 2011Mesoscale Discussions in Illinois, 2011Every mesoscale discussion in 2011
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.