Alert archive / Indiana / Mesoscale Discussions in 2011
Mesoscale Discussion 479
The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2011, 8:07 PM CDT for 6 states. It was in force for 83 min.
The area
The outline as issued.
The facts
- Issued
- Apr 19, 2011, 8:07 PM CDT (01:07 UTC)
- Expired
- Apr 19, 2011, 9:30 PM CDT
- In force
- 83 min
- Issued by
- the Storm Prediction Center
All 154 counties
Arkansas County, AR, Clay County, AR, Cleveland County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Dallas County, AR, Grant County, AR, Greene County, AR, Jackson County, AR, Jefferson County, AR, Lawrence County, AR, Lee County, AR, Lincoln County, AR, Lonoke County, AR, Mississippi County, AR, Monroe County, AR, Phillips County, AR, Poinsett County, AR, Prairie County, AR, Randolph County, AR, St. Francis County, AR, White County, AR, Woodruff County, AR, Alexander County, IL, Bond County, IL, Champaign County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, Douglas County, IL, Edgar County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Johnson County, IL, Lawrence County, IL, Madison County, IL, Marion County, IL, Massac County, IL, Monroe County, IL, Montgomery County, IL, Moultrie County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Saline County, IL, Shelby County, IL, Union County, IL, Vermilion County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Blackford County, IN, Boone County, IN, Carroll County, IN, Cass County, IN, Clay County, IN, Clinton County, IN, Daviess County, IN, Delaware County, IN, Fountain County, IN, Fulton County, IN, Gibson 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, Johnson County, IN, Knox County, IN, Kosciusko County, IN, Madison County, IN, Marion County, IN, Miami County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Owen County, IN, Parke County, IN, Pike County, IN, Posey County, IN, Pulaski County, IN, Putnam County, IN, Sullivan County, IN, Tippecanoe County, IN, Tipton County, IN, Vanderburgh County, IN, Vermillion County, IN, Vigo County, IN, Wabash County, IN, Warren County, IN, Wells County, IN, White County, IN, Whitley County, IN, Ballard County, KY, Carlisle County, KY, Crittenden County, KY, Fulton County, KY, Graves County, KY, Henderson County, KY, Hickman County, KY, Livingston County, KY, Marshall County, KY, McCracken County, KY, Union County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, Carter County, MO, City of Saint Louis, MO, Dunklin County, MO, Howell County, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Oregon County, MO, Ozark County, MO, Pemiscot County, MO, Perry County, MO, Reynolds County, MO, Ripley County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Scott County, MO, Shannon County, MO, Stoddard County, MO, Washington County, MO, Wayne County, MO, Dyer County, TN, Lake County, TN, Lauderdale County, TN, Obion County, TN, Tipton County, TN
The radar
The Paducah radar (KPAH), 90 km from the middle of the area, began a volume at 01:08 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, 1.1 hours before the alert went out and 266 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
- 2409 J/kg
- Mixed-layer CIN
- -46 J/kg
- Mixed-layer LCL
- 523 m above ground
- 0-6 km bulk shear
- 62 kt
- 0-1 km storm-relative helicity
- 370 m²/s²
- 0-3 km storm-relative helicity
- 547 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 24.4
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 19, 7:47 PM CDT | Mesoscale Discussion | SPC | Conway, Franklin, Howard, Johnson, Little River, Logan and 13 more | 88 min |
| Apr 19, 10:14 PM CDT | Tornado Watch | SPC | Ashley, Chicot | 7 hr |
| Apr 19, 11:17 PM CDT | Mesoscale Discussion | SPC | Columbia, Hempstead, Lafayette, Little River, Miller, Nevada and 1 more | 58 min |
| Apr 19, 11:45 PM CDT | Severe Thunderstorm Watch | SPC | Columbia, Hempstead, Lafayette, Little River, Miller, Nevada and 1 more | 3 hr |
| Apr 20, 3:37 AM CDT | Severe Thunderstorm Watch | SPC | Ashley, Chicot | 8 hr |
| Apr 20, 12:46 PM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Chicot, Columbia, Desha and 8 more | 89 min |
| Apr 20, 1:02 PM CDT | Severe Thunderstorm Watch | SPC | Ashley, Chicot, Lee, Phillips | 7 hr |
| Apr 20, 2:04 PM CDT | Severe Thunderstorm Watch | SPC | Arkansas, Bradley, Calhoun, Clark, Cleburne, Cleveland and 36 more | 7 hr |
| Apr 20, 5:24 PM CDT | Mesoscale Discussion | SPC | Chicot, Drew | 96 min |
| Apr 20, 5:56 PM CDT | Mesoscale Discussion | SPC | Arkansas, Bradley, Calhoun, Clark, Cleveland, Dallas and 23 more | 2 hr |
| Apr 19, 8:37 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Allen, Blackford, Cass, DeKalb, Elkhart and 18 more | 3 hr |
| Apr 19, 8:47 PM CDT | Mesoscale Discussion | SPC | Clark, Dearborn, Floyd, Jefferson, Ohio, Switzerland | 88 min |
| Apr 19, 9:13 PM CDT | Tornado Watch | SPC | Clark, Crawford, Dearborn, Dubois, Fayette, Floyd and 12 more | 6 hr |
| Apr 19, 11:56 PM CDT | Mesoscale Discussion | SPC | Clark, Dearborn, Franklin, Jefferson, Ohio, Ripley and 1 more | 94 min |
| Apr 20, 12:59 AM CDT | Tornado Watch | SPC | Bath, Bell, Boyd, Breathitt, Carter, Clay and 31 more | 5 hr |
| Apr 20, 2:20 AM CDT | Mesoscale Discussion | SPC | Bell, Boyd, Breathitt, Clay, Clinton, Cumberland and 23 more | 85 min |
| Apr 19, 9:39 PM CDT | Mesoscale Discussion | SPC | Bedford, Benton, Cannon, Carroll, Cheatham, Chester and 23 more | 66 min |
| Apr 20, 1:42 AM CDT | Tornado Watch | SPC | Anderson, Bledsoe, Blount, Bradley, Campbell, Cannon and 42 more | 5 hr |
Nearby
Mesoscale Discussions in Indiana, 2011Mesoscale Discussions in Illinois, 2011Mesoscale Discussions in Missouri, 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.