Alert archive / Indiana / Mesoscale Discussions in 2011
Mesoscale Discussion 340
The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2011, 4:20 AM CDT for 8 counties in Illinois; 54 counties in Indiana; 27 counties in Ohio. It was in force for 25 min.
The area
The outline as issued.
The facts
- Issued
- Apr 4, 2011, 4:20 AM CDT (09:20 UTC)
- Expired
- Apr 4, 2011, 4:45 AM CDT
- In force
- 25 min
- Issued by
- the Storm Prediction Center
All 89 counties
Clark County, IL, Clay County, IL, Crawford County, IL, Effingham County, IL, Jasper County, IL, Lawrence County, IL, Marion County, IL, Richland County, IL, Adams County, IN, Allen County, IN, Bartholomew County, IN, Blackford County, IN, Boone County, IN, Brown County, IN, Clay County, IN, Clinton County, IN, Daviess County, IN, Decatur County, IN, DeKalb County, IN, Delaware County, IN, Fayette County, IN, Franklin County, IN, Grant County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Hendricks County, IN, Henry County, IN, Howard County, IN, Huntington County, IN, Jackson County, IN, Jay County, IN, Jennings County, IN, Johnson County, IN, Knox County, IN, Kosciusko County, IN, LaGrange County, IN, Lawrence County, IN, Madison County, IN, Marion County, IN, Martin County, IN, Miami County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Noble County, IN, Owen County, IN, Parke County, IN, Putnam County, IN, Randolph County, IN, Ripley County, IN, Rush County, IN, Shelby County, IN, Steuben County, IN, Sullivan County, IN, Tipton County, IN, Union County, IN, Vigo County, IN, Wabash County, IN, Wayne County, IN, Wells County, IN, Whitley County, IN, Allen County, OH, Auglaize County, OH, Butler County, OH, Champaign County, OH, Crawford County, OH, Darke County, OH, Defiance County, OH, Fulton County, OH, Hancock County, OH, Hardin County, OH, Henry County, OH, Logan County, OH, Marion County, OH, Mercer County, OH, Miami County, OH, Montgomery County, OH, Paulding County, OH, Preble County, OH, Putnam County, OH, Sandusky County, OH, Seneca County, OH, Shelby County, OH, Union County, OH, Van Wert County, OH, Williams County, OH, Wood County, OH, Wyandot County, OH
The radar
The Indianapolis radar (KIND), 42 km from the middle of the area, began a volume at 09:20 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
Cncnati-Daytn, OH (KILN), launched 00:00Z, 9.3 hours before the alert went out and 201 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
- 2409 m above ground
- 0-6 km bulk shear
- 72 kt
- 0-1 km storm-relative helicity
- 429 m²/s²
- 0-3 km storm-relative helicity
- 944 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
202
ACUS11 KWNS 040920
SWOMCD
SPC MCD 040920
OHZ000-MIZ000-INZ000-ILZ000-040945-
MESOSCALE DISCUSSION 0340
NWS STORM PREDICTION CENTER NORMAN OK
0420 AM CDT MON APR 04 2011
AREAS AFFECTED...S-CNTRL IL / MUCH OF IND / NWRN OH
CONCERNING...SEVERE POTENTIAL...WATCH LIKELY
VALID 040920Z - 040945Z
ISOLD STRONG-SEVERE WIND GUSTS ARE POSSIBLE THROUGH THE MID-MORNING
HOURS AHEAD OF ADVANCING/INTENSIFYING LINE SEGMENTS ACROSS THE NRN
HALF OF IND AND FARTHER SW OVER SRN IL. A WW WILL NEED TO BE
CONSIDERED WITHIN THE HOUR TO ADDRESS THIS THREAT.
MOISTURE RETURN...ALTHOUGH MODEST...IS GRADUALLY ADVECTING NEWD
IMMEDIATELY AHEAD OF THE LINE SEGMENT OVER CNTRL-NRN IND. 09Z
SURFACE OBSERVATIONS SHOW DEWPOINTS RISING THROUGH THE 50S...WITH
TEMPS HOLDING NEAR OR ABOVE 70 DEG F. THIS IS RESULTING IN A WEAKLY
UNSTABLE AIRMASS...ALTHOUGH STRONG UNIDIRECTIONAL FLOW FIELDS ARE
AIDING IN STORM ORGANIZATION/INTENSIFICATION. 60 KT FLOW AT 1 KM
AGL PER AREA VWP/PROFILER DATA AND FURTHER STORM ORGANIZATION
SUGGEST A CONTINUATION IN TSTM WIND DAMAGE POTENTIAL AS STORMS
CONTINUE EWD INTO NWRN OH AND ACROSS S-CNTRL IND.
..SMITH.. 04/04/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...CLE...ILN...DTX...LMK...IWX...IND...PAH...ILX...
LSX...
LAT...LON 38598656 38378922 39168896 39278805 40438658 41638570
41788529 41908422 41368271 40378306 38958535 38598656SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 3, 7:44 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Fulton, Hancock, Henderson and 16 more | 61 min |
| Apr 3, 8:11 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Calhoun, Cass, Fulton, Greene and 12 more | 6 hr |
| Apr 3, 8:54 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Cook, DeKalb, DuPage, Grundy, Kane and 9 more | 5 hr |
| Apr 3, 10:23 PM CDT | Mesoscale Discussion | SPC | Boone, Carroll, Cook, DeKalb, DuPage, Jo Daviess and 10 more | 67 min |
| Apr 3, 10:50 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Cass, Fulton, Hancock, McDonough and 4 more | 85 min |
| Apr 4, 1:29 AM CDT | Mesoscale Discussion | SPC | Adams, Bond, Brown, Calhoun, Cass, Christian and 31 more | 91 min |
| Apr 4, 1:53 AM CDT | Mesoscale Discussion | SPC | Cook, DuPage, Grundy, Kane, Kendall, Lake and 2 more | 97 min |
| Apr 4, 6:53 AM CDT | Mesoscale Discussion | SPC | Hardin, Lawrence, Wabash | 2 hr |
| Apr 4, 7:22 AM CDT | Tornado Watch | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 7 hr |
| Apr 4, 4:30 AM CDT | Severe Thunderstorm Watch | SPC | Adams, Allen, Bartholomew, Blackford, Boone, Brown and 39 more | 8 hr |
| Apr 4, 11:34 AM CDT | Tornado Watch | SPC | Clark, Crawford, Floyd, Harrison, Jefferson, Orange and 3 more | 5 hr |
| Apr 4, 11:50 AM CDT | Mesoscale Discussion | SPC | Dearborn, Decatur, Franklin, Jennings, Ohio, Ripley and 1 more | 25 min |
| Apr 4, 1:25 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Lawrence, Scioto | 65 min |
| Apr 4, 2:05 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Athens, Fairfield, Gallia, Highland, Hocking and 11 more | 6 hr |
| Apr 4, 3:12 PM CDT | Mesoscale Discussion | SPC | Athens, Belmont, Carroll, Columbiana, Coshocton, Guernsey and 12 more | 63 min |
| Apr 4, 3:49 PM CDT | Mesoscale Discussion | SPC | Lawrence | 56 min |
| Apr 4, 5:00 PM CDT | Mesoscale Discussion | SPC | Lawrence, Monroe, Washington | 90 min |
Nearby
Mesoscale Discussions in Indiana, 2011Mesoscale Discussions in Ohio, 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.