Alert archive / Arkansas / Mesoscale Discussions in 2018
Mesoscale Discussion 1669
The Storm Prediction Center issued this mesoscale discussion at Nov 30, 2018, 6:17 PM CST for 4 states. It was in force for 58 min.
The area
The outline as issued.
The facts
- Issued
- Nov 30, 2018, 6:17 PM CST (00:17 UTC)
- Expired
- Nov 30, 2018, 7:15 PM CST
- In force
- 58 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 95%
All 76 counties
Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleburne County, AR, Cleveland County, AR, Columbia County, AR, Conway County, AR, Crawford County, AR, Cross County, AR, Dallas County, AR, Drew County, AR, Faulkner County, AR, Franklin County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Independence County, AR, Jackson County, AR, Jefferson County, AR, Johnson County, AR, Lafayette County, AR, Lincoln County, AR, Little River County, AR, Logan County, AR, Lonoke County, AR, Madison County, AR, Miller County, AR, Monroe County, AR, Montgomery County, AR, Nevada County, AR, Newton 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, Scott County, AR, Searcy County, AR, Sebastian County, AR, Sevier 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, Claiborne Parish, LA, De Soto Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Red River Parish, LA, Union Parish, LA, Webster Parish, LA, McCurtain County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Panola County, TX, Rusk County, TX, Smith County, TX, Titus County, TX, Upshur County, TX
The radar
The Little Rock radar (KLZK), 109 km from the middle of the area, began a volume at 00:17 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
Springfield, MO (KSGF), launched 00:00Z, 0.3 hours before the alert went out and 286 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
- 202 J/kg
- Mixed-layer CIN
- -93 J/kg
- Mixed-layer LCL
- 687 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- 241 m²/s²
- 0-3 km storm-relative helicity
- 266 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.6
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 |
|---|---|---|---|---|
| Nov 30, 6:40 PM CST | Tornado Watch | SPC | Arkansas, Baxter, Benton, Boone, Bradley, Calhoun and 63 more | 7 hr |
| Nov 30, 9:02 PM CST | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Clark, Cleburne and 50 more | 58 min |
| Nov 30, 11:20 PM CST | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Bradley, Calhoun, Carroll and 41 more | 85 min |
| Dec 1, 12:58 AM CST | Mesoscale Discussion | SPC | Arkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 58 more | 2 hr |
| Dec 1, 1:58 AM CST | Tornado Watch | SPC | Arkansas, Bradley, Calhoun, Clark, Cleburne, Cleveland and 33 more | 5 hr |
| Dec 1, 3:25 AM CST | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Chicot, Clay, Cleveland and 17 more | 2 hr |
| Nov 30, 6:35 PM CST | Mesoscale Discussion | SPC | Atoka, Bryan, Canadian, Carter, Cherokee, Choctaw and 44 more | 85 min |
| Nov 30, 9:52 PM CST | Mesoscale Discussion | SPC | Adair, Atoka, Bryan, Cherokee, Choctaw, Craig and 19 more | 83 min |
| Nov 30, 10:32 PM CST | Mesoscale Discussion | SPC | Bell, Burnet, Ellis, Falls, Freestone, Henderson and 8 more | 88 min |
Nearby
Mesoscale Discussions in Arkansas, 2018Mesoscale Discussions in Texas, 2018Mesoscale Discussions in Louisiana, 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.