Alert archive / Arkansas / Mesoscale Discussions in 2015
Mesoscale Discussion 249
The Storm Prediction Center issued this mesoscale discussion at Apr 9, 2015, 2:15 PM CDT for 4 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 9, 2015, 2:15 PM CDT (19:15 UTC)
- Expired
- Apr 9, 2015, 4:15 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 54 counties
Arkansas County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleburne County, AR, Cleveland County, AR, Columbia County, AR, Conway County, AR, Dallas County, AR, Faulkner County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Jefferson County, AR, Lafayette County, AR, Lincoln County, AR, Little River County, AR, Lonoke County, AR, Miller County, AR, Monroe County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Sevier County, AR, Union County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, Webster Parish, LA, McCurtain County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Franklin County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Red River County, TX, Titus County, TX, Upshur County, TX
The radar
The Little Rock radar (KLZK), 123 km from the middle of the area, began a volume at 19:15 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
Shreveport, LA (KBAD), launched 12:00Z, 7.3 hours before the alert went out and 195 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
- 641 J/kg
- Mixed-layer CIN
- -116 J/kg
- Mixed-layer LCL
- 674 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 207 m²/s²
- 0-3 km storm-relative helicity
- 244 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 4.1
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 9, 2:32 PM CDT | Severe Thunderstorm Watch | SPC | Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more | 7 hr |
| Apr 9, 3:06 PM CDT | Tornado Watch | SPC | Arkansas, Bradley, Calhoun, Clark, Cleveland, Columbia and 13 more | 7 hr |
| Apr 9, 3:17 PM CDT | Severe Thunderstorm Watch | SPC | Baxter, Boone, Cleburne, Conway, Faulkner, Fulton and 29 more | 7 hr |
| Apr 9, 6:11 PM CDT | Mesoscale Discussion | SPC | Arkansas, Baxter, Bradley, Calhoun, Clark, Clay and 57 more | 64 min |
| Apr 9, 6:32 PM CDT | Severe Thunderstorm Watch | SPC | Ashley, Chicot, Clay, Craighead, Crittenden, Cross and 8 more | 5 hr |
| Apr 8, 7:45 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beckham, Blaine, Caddo, Canadian, Custer and 22 more | 90 min |
| Apr 9, 1:32 PM CDT | Mesoscale Discussion | SPC | Ottawa | 118 min |
| Apr 8, 7:23 PM CDT | Severe Thunderstorm Watch | SPC | Borden, Childress, Coke, Cottle, Crosby, Dawson and 27 more | 3 hr |
| Apr 8, 9:34 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Haskell, Throckmorton, Wichita, Wilbarger and 1 more | 56 min |
| Apr 9, 4:53 PM CDT | Mesoscale Discussion | SPC | Bosque, Collin, Comanche, Dallas, Denton, Erath and 8 more | 2 hr |
Nearby
Mesoscale Discussions in Arkansas, 2015Mesoscale Discussions in Texas, 2015Mesoscale Discussions in Louisiana, 2015Every mesoscale discussion in 2015
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.