Alert archive / Arkansas / Mesoscale Discussions in 2017
Mesoscale Discussion 560
The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2017, 9:39 AM CDT for 4 states. It was in force for 36 min.
The area
The outline as issued.
The facts
- Issued
- Apr 26, 2017, 9:39 AM CDT (14:39 UTC)
- Expired
- Apr 26, 2017, 10:15 AM CDT
- In force
- 36 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 95%
All 76 counties
Arkansas County, AR, Baxter 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, 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, Poinsett County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Searcy 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, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, Webster Parish, LA, Butler County, MO, Carter County, MO, Dunklin County, MO, Howell County, MO, New Madrid County, MO, Oregon County, MO, Ripley County, MO, Stoddard County, MO, Wayne County, MO, Bowie County, TX, Camp County, TX, Cass County, TX, Franklin County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Titus County, TX, Upshur County, TX
The radar
The Little Rock radar (KLZK), 55 km from the middle of the area, began a volume at 14:42 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, 2.7 hours before the alert went out and 244 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
- 761 J/kg
- Mixed-layer CIN
- -435 J/kg
- Mixed-layer LCL
- 770 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 324 m²/s²
- 0-3 km storm-relative helicity
- 327 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 25, 10:51 PM CDT | Mesoscale Discussion | SPC | Benton, Boone, Carroll, Madison, Washington | 54 min |
| Apr 25, 11:27 PM CDT | Severe Thunderstorm Watch | SPC | Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more | 7 hr |
| Apr 26, 1:42 AM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Carroll, Crawford, Franklin, Johnson and 10 more | 2 hr |
| Apr 26, 5:37 AM CDT | Mesoscale Discussion | SPC | Conway, Crawford, Franklin, Garland, Howard, Johnson and 14 more | 113 min |
| Apr 26, 6:00 AM CDT | Severe Thunderstorm Watch | SPC | Baxter, Boone, Carroll, Conway, Crawford, Franklin and 23 more | 7 hr |
| Apr 26, 7:29 AM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Carroll, Conway, Crawford, Franklin and 23 more | 2 hr |
| Apr 26, 10:08 AM CDT | Tornado Watch | SPC | Arkansas, Baxter, Bradley, Calhoun, Clark, Clay and 51 more | 7 hr |
| Apr 26, 1:05 PM CDT | Mesoscale Discussion | SPC | Clark, Columbia, Dallas, Grant, Hempstead, Hot Spring and 9 more | 85 min |
| Apr 26, 3:53 PM CDT | Mesoscale Discussion | SPC | Clay | 97 min |
| Apr 26, 4:23 PM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 19 more | 67 min |
| Apr 26, 4:44 PM CDT | Tornado Watch | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 11 more | 5 hr |
| Apr 26, 5:02 PM CDT | Severe Thunderstorm Watch | SPC | Clay, Craighead, Crittenden, Cross, Greene, Lee and 4 more | 6 hr |
| Apr 26, 6:10 PM CDT | Mesoscale Discussion | SPC | Mississippi | 95 min |
| Apr 25, 7:14 PM CDT | Mesoscale Discussion | SPC | McDonald | 91 min |
| Apr 26, 12:26 PM CDT | Mesoscale Discussion | SPC | Bollinger, Butler, Cape Girardeau, Carter, Madison, Mississippi and 6 more | 94 min |
| Apr 26, 12:46 PM CDT | Severe Thunderstorm Watch | SPC | Bollinger, Butler, Cape Girardeau, Carter, Madison, Perry and 6 more | 6 hr |
Nearby
Mesoscale Discussions in Arkansas, 2017Mesoscale Discussions in Texas, 2017Mesoscale Discussions in Missouri, 2017Every mesoscale discussion in 2017
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.