Alert archive / Indiana / Mesoscale Discussions in 2011
Mesoscale Discussion 863
The Storm Prediction Center issued this mesoscale discussion at May 22, 2011, 4:16 PM CDT for 8 counties in Illinois; 36 counties in Indiana; 15 counties in Michigan. It was in force for 119 min.
The area
The outline as issued.
The facts
- Issued
- May 22, 2011, 4:16 PM CDT (21:16 UTC)
- Expired
- May 22, 2011, 6:15 PM CDT
- In force
- 119 min
- Issued by
- the Storm Prediction Center
All 59 counties
Champaign County, IL, Douglas County, IL, Edgar County, IL, Ford County, IL, Iroquois County, IL, Kankakee County, IL, Piatt County, IL, Vermilion County, IL, Allen County, IN, Benton County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, DeKalb County, IN, Elkhart County, IN, Fountain 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, Montgomery County, IN, Newton County, IN, Noble County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, Tippecanoe County, IN, Tipton County, IN, Vermillion County, IN, Wabash County, IN, Warren 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, Saint Joseph County, MI, Van Buren County, MI
The radar
The Northern Indiana radar (KIWX), 87 km from the middle of the area, began a volume at 21:17 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, 9.3 hours before the alert went out and 196 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1465 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- -98 m²/s²
- 0-3 km storm-relative helicity
- 133 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
011
ACUS11 KWNS 222117
SWOMCD
SPC MCD 222116
MIZ000-OHZ000-INZ000-ILZ000-222315-
MESOSCALE DISCUSSION 0863
NWS STORM PREDICTION CENTER NORMAN OK
0416 PM CDT SUN MAY 22 2011
AREAS AFFECTED...SWRN LWR MI...NRN IND...ECNTRL IL
CONCERNING...TORNADO WATCH 327...
VALID 222116Z - 222315Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 327 CONTINUES.
LINE OF INTENSE THUNDERSTORMS EXTENDS FROM SOUTHERN LOWER MI INTO
CENTRAL IL. THESE STORMS WILL SPREAD INTO PORTIONS OF LOWER
MI...NORTHERN/WESTERN IND...AND EAST CENTRAL IL WITH A CONTINUED
RISK OF SEVERE WEATHER. A NEW WW WILL LIKELY BE NEEDED SOON.
SEVERAL STRONG/SEVERE STORMS WILL SPREAD EASTWARD ACROSS THE MCD
AREA DURING THE EVENING. STRONG HEATING HAS OCCURRED ACROSS THIS
REGION...WITH MID 60S DEWPOINTS CONTRIBUTING TO MLCAPE VALUES OF
2000-3000 J/KG AND A WEAK CAP. THE 18Z ILX RAOB INDICATED VERY
STEEP MID LEVEL LAPSE RATES AND SUFFICIENT DEEP LAYER EFFECTIVE
SHEAR FOR A RISK OF SUPERCELLS. STORMS MAY BE ORGANIZING UPSCALE
INTO A LINEAR MCS. DAMAGING WINDS AND LARGE HAIL APPEAR TO BE THE
MAIN THREATS. HOWEVER...SOUTHWESTERLY LOW LEVEL WINDS ARE STRONG
ENOUGH TO WARRANT SOME CONCERN FOR TORNADOES THIS EVENING.
..HART.. 05/22/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...IWX...GRR...IND...LOT...ILX...
LAT...LON 39868893 40708858 41968741 42948634 43088450 42448427
41038487 40328562 39648772 39868893SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 22, 4:41 AM CDT | Mesoscale Discussion | SPC | Adams, Boone, Brown, Bureau, Carroll, Cass and 37 more | 2 hr |
| May 22, 10:53 AM CDT | Mesoscale Discussion | SPC | Adams, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more | 2 hr |
| May 22, 12:51 PM CDT | Tornado Watch | SPC | Adams, Bond, Brown, Bureau, Calhoun, Carroll and 42 more | 10 hr |
| May 22, 1:49 PM CDT | Mesoscale Discussion | SPC | Boone, Cook, DeKalb, DuPage, Grundy, Kane and 10 more | 56 min |
| May 22, 2:04 PM CDT | Tornado Watch | SPC | Boone, Cook, DeKalb, DuPage, Ford, Grundy and 12 more | 9 hr |
| May 22, 2:59 PM CDT | Mesoscale Discussion | SPC | Jo Daviess | 2 hr |
| May 22, 5:47 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, DeKalb, DuPage, Grundy and 23 more | 88 min |
| May 22, 1:18 PM CDT | Severe Thunderstorm Watch | SPC | Clark, Crawford, Dubois, Floyd, Harrison, Jefferson and 4 more | 7 hr |
| May 22, 1:51 PM CDT | Mesoscale Discussion | SPC | Adams, Allen, Bartholomew, Blackford, Boone, Brown and 37 more | 54 min |
| May 22, 2:15 PM CDT | Mesoscale Discussion | SPC | Steuben | 60 min |
| May 22, 4:32 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Allen, Blackford, Carroll, Cass, Clinton and 27 more | 7 hr |
| May 22, 2:41 PM CDT | Severe Thunderstorm Watch | SPC | Bay, Genesee, Huron, Lapeer, Lenawee, Livingston and 11 more | 3 hr |
| May 22, 3:43 PM CDT | Tornado Watch | SPC | Baraga, Dickinson, Gogebic, Houghton, Iron, Marquette and 2 more | 5 hr |
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.