Alert archive / Indiana / Mesoscale Discussions in 2011
Mesoscale Discussion 607
The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2011, 8:35 PM CDT for 4 states. It was in force for 55 min.
The area
The outline as issued.
The facts
- Issued
- Apr 26, 2011, 8:35 PM CDT (01:35 UTC)
- Expired
- Apr 26, 2011, 9:30 PM CDT
- In force
- 55 min
- Issued by
- the Storm Prediction Center
All 67 counties
Crawford County, IL, Edwards County, IL, Gallatin County, IL, Lawrence County, IL, Wabash County, IL, White County, IL, Bartholomew County, IN, Boone County, IN, Brown County, IN, Clark County, IN, Clay County, IN, Crawford County, IN, Daviess County, IN, Decatur County, IN, Dubois County, IN, Fayette County, IN, Floyd County, IN, Fountain County, IN, Franklin County, IN, Gibson County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Harrison County, IN, Hendricks County, IN, Henry County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Johnson County, IN, Knox County, IN, Lawrence County, IN, Marion County, IN, Martin County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Orange County, IN, Owen County, IN, Parke County, IN, Perry County, IN, Pike County, IN, Posey County, IN, Putnam County, IN, Ripley County, IN, Rush County, IN, Scott County, IN, Shelby County, IN, Spencer County, IN, Sullivan County, IN, Union County, IN, Vanderburgh County, IN, Vigo County, IN, Warrick County, IN, Washington County, IN, Wayne County, IN, Breckinridge County, KY, Bullitt County, KY, Daviess County, KY, Hancock County, KY, Hardin County, KY, Henderson County, KY, Jefferson County, KY, Meade County, KY, Oldham County, KY, Trimble County, KY, Preble County, OH
The radar
The Evansville,IN radar (KVWX), 86 km from the middle of the area, began a volume at 01:37 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 00:00Z, 1.6 hours before the alert went out and 221 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
- 1179 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 97 m²/s²
- 0-3 km storm-relative helicity
- 125 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
844 ACUS11 KWNS 270136 SWOMCD SPC MCD 270135 OHZ000-INZ000-KYZ000-ILZ000-270230- MESOSCALE DISCUSSION 0607 NWS STORM PREDICTION CENTER NORMAN OK 0835 PM CDT TUE APR 26 2011 AREAS AFFECTED...SRN IN...PORTIONS OF NRN KY CONCERNING...TORNADO WATCH 219... VALID 270135Z - 270230Z THE SEVERE WEATHER THREAT FOR TORNADO WATCH 219 CONTINUES. SVR THREAT ACROSS SRN IND AND FAR NRN KY REMAINS QUITE CONDITIONAL ATTM...AS THE ENVIRONMENT REMAINS MARGINALLY UNSTABLE AND SFC FLOW RATHER WEAK. WITH THE LOSS OF DIABATIC HEATING...AND SHORTWAVE RIDGING OVERHEAD...CONVECTION HAS BEEN SUPPRESSED OVER MUCH OF THE WW AREA /WITH EXCEPTION TO LEFT SPLITTING STORM THAT MOVED N ACROSS THE AREA...AND RIGHT-MOVING SUPERCELL NEAR THE OH RIVER VALLEY NOW OVER N-CNTRL KY/. CONVECTION S OF THE WATCH AREA IS EXPECTED TO APPROACH THE OH RIVER VALLEY WITHIN THE NEXT FEW HRS. THIS SCENARIO IS SUPPORTED BY HIGH-RESOLUTION MODELS /INCLUDING WRF-NMM AND EXPERIMENTAL HRRR GUIDANCE/...WHICH INDICATE THUNDERSTORMS WILL CONTINUE TO DEVELOP NWD NEAR 03Z NEAR SRN PORTIONS OF THE WATCH AREA...WITH ACCOMPANYING SVR AND/OR TOR POTENTIAL POSSIBLE. THIS MAY REQUIRE AN ADDITIONAL WW LATER TONIGHT. ..ROGERS.. 04/27/2011 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...ILN...LMK...IND...PAH...ILX... LAT...LON 37728847 40148725 40098445 37698578 37728847
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 26, 9:13 PM CDT | Mesoscale Discussion | SPC | Alexander, Gallatin, Hardin, Johnson, Massac, Pope and 5 more | 62 min |
| Apr 27, 12:42 PM CDT | Severe Thunderstorm Watch | SPC | Alexander, Hardin, Johnson, Massac, Pope, Pulaski and 1 more | 5 hr |
| Apr 27, 3:06 PM CDT | Mesoscale Discussion | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 10 more | 54 min |
| Apr 27, 3:29 PM CDT | Tornado Watch | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 5 hr |
| Apr 27, 5:27 PM CDT | Mesoscale Discussion | SPC | Clark, Crawford, Edwards, Gallatin, Hamilton, Hardin and 7 more | 63 min |
| Apr 26, 7:33 PM CDT | Mesoscale Discussion | SPC | Adams, Allen, Blackford, Boone, Carroll, Cass and 35 more | 57 min |
| Apr 26, 9:58 PM CDT | Tornado Watch | SPC | Clark, Crawford, Dubois, Floyd, Harrison, Jefferson and 4 more | 7 hr |
| Apr 27, 4:38 PM CDT | Mesoscale Discussion | SPC | Clark, Crawford, Floyd, Harrison, Jefferson, Ohio and 4 more | 37 min |
| Apr 27, 4:44 PM CDT | Tornado Watch | SPC | Clark, Crawford, Dubois, Floyd, Harrison, Jefferson and 5 more | 7 hr |
| Apr 27, 6:22 PM CDT | Tornado Watch | SPC | Adams, Bartholomew, Blackford, Boone, Brown, Carroll and 49 more | 8 hr |
| Apr 27, 4:33 AM CDT | Mesoscale Discussion | SPC | Adair, Barren, Boyle, Casey, Clinton, Cumberland and 12 more | 57 min |
| Apr 27, 5:07 AM CDT | Tornado Watch | SPC | Adair, Allen, Anderson, Barren, Bourbon, Boyle and 28 more | 5 hr |
| Apr 27, 7:34 AM CDT | Tornado Watch | SPC | Bath, Bell, Breathitt, Clay, Elliott, Estill and 21 more | 4 hr |
| Apr 27, 8:39 AM CDT | Mesoscale Discussion | SPC | Boyd, Carter, Greenup, Lewis | 66 min |
| Apr 27, 2:22 PM CDT | Mesoscale Discussion | SPC | Bell, Breathitt, Clay, Floyd, Harlan, Jackson and 11 more | 83 min |
| Apr 27, 12:24 PM CDT | Mesoscale Discussion | SPC | Ashtabula, Belmont, Carroll, Columbiana, Guernsey, Harrison and 9 more | 96 min |
Nearby
Mesoscale Discussions in Indiana, 2011Mesoscale Discussions in Kentucky, 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.