Alert archive / Arkansas / Mesoscale Discussions in 2018
Mesoscale Discussion 249
The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2018, 8:54 PM CDT for 4 states. It was in force for 66 min.
The area
The outline as issued.
The facts
- Issued
- Apr 13, 2018, 8:54 PM CDT (01:54 UTC)
- Expired
- Apr 13, 2018, 10:00 PM CDT
- In force
- 66 min
- Issued by
- the Storm Prediction Center
All 84 counties
Arkansas County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Clay County, AR, Cleburne County, AR, Cleveland County, AR, Columbia County, AR, Conway County, AR, Craighead County, AR, Cross County, AR, Dallas County, AR, Faulkner County, AR, Fulton County, AR, Garland County, AR, Grant County, AR, Greene County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Jefferson County, AR, Lafayette County, AR, Lawrence County, AR, Lee 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, Phillips County, AR, Pike County, AR, Poinsett County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Sevier County, AR, Sharp County, AR, St. Francis County, AR, Stone County, AR, Union County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Union Parish, LA, Webster Parish, LA, Winn Parish, LA, Dunklin County, MO, Bowie County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Panola County, TX, Rusk County, TX, Shelby County, TX, Smith County, TX, Titus County, TX, Upshur County, TX
The radar
The Little Rock radar (KLZK), 133 km from the middle of the area, began a volume at 01:53 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 00:00Z, 1.9 hours before the alert went out and 180 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
- 1539 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 1018 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 238 m²/s²
- 0-3 km storm-relative helicity
- 235 m²/s²
- Significant tornado parameter
- 1.4
- Supercell composite
- 13.1
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 13, 7:06 PM CDT | Mesoscale Discussion | SPC | Howard, Montgomery, Yell | 24 min |
| Apr 13, 7:22 PM CDT | Tornado Watch | SPC | Arkansas, Ashley, Chicot, Desha, Drew, Lincoln and 1 more | 3 hr |
| Apr 13, 8:36 PM CDT | Mesoscale Discussion | SPC | Garland, Howard, Pike | 54 min |
| Apr 13, 9:53 PM CDT | Tornado Watch | SPC | Arkansas, Baxter, Bradley, Calhoun, Clark, Cleburne and 37 more | 8 hr |
| Apr 13, 10:12 PM CDT | Tornado Watch | SPC | Ashley, Chicot, Clay, Craighead, Crittenden, Cross and 8 more | 10 hr |
| Apr 14, 2:10 AM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Chicot, Desha, Drew and 3 more | 2 hr |
| Apr 14, 6:37 AM CDT | Mesoscale Discussion | SPC | Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 20 more | 83 min |
| Apr 14, 6:57 AM CDT | Tornado Watch | SPC | Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 22 more | 7 hr |
| Apr 13, 8:42 PM CDT | Mesoscale Discussion | SPC | Bollinger, Butler, Camden, Cape Girardeau, Carter, Cole and 33 more | 63 min |
Nearby
Mesoscale Discussions in Arkansas, 2018Mesoscale Discussions in Louisiana, 2018Mesoscale Discussions in Texas, 2018Every mesoscale discussion in 2018
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.