Alert archive / Arkansas / Severe Thunderstorm Watches in 2018
Severe Thunderstorm Watch 288
The Storm Prediction Center issued this severe thunderstorm watch at Jul 19, 2018, 8:54 PM CDT for 41 counties in Arkansas; 8 counties in Mississippi; 6 counties in Tennessee. It was in force for 114 min.
The area
The outline as issued.
The facts
- Issued
- Jul 19, 2018, 8:54 PM CDT (01:54 UTC)
- Expired
- Jul 19, 2018, 10:48 PM CDT
- In force
- 114 min
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 55 counties
Arkansas County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Clay County, AR, Cleveland County, AR, Conway County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Faulkner County, AR, Garland County, AR, Grant County, AR, Greene County, AR, Hot Spring County, AR, Jackson County, AR, Jefferson County, AR, Lawrence County, AR, Lee County, AR, Lincoln County, AR, Logan County, AR, Lonoke County, AR, Mississippi County, AR, Monroe County, AR, Montgomery County, AR, Ouachita County, AR, Perry County, AR, Phillips County, AR, Pike County, AR, Poinsett County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, St. Francis County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Coahoma County, MS, DeSoto County, MS, Lafayette County, MS, Marshall County, MS, Panola County, MS, Quitman County, MS, Tate County, MS, Tunica County, MS, Dyer County, TN, Fayette County, TN, Haywood County, TN, Lauderdale County, TN, Shelby County, TN, Tipton County, TN
The radar
The Little Rock radar (KLZK), 49 km from the middle of the area, began a volume at 01:54 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 9:29 PM CDT | Severe Thunderstorm Warning | MEG | Phillips | 29 min |
| Jul 19, 9:30 PM CDT | Severe Thunderstorm Warning | MEG | Panola, Tate | 45 min |
| Jul 19, 9:46 PM CDT | Severe Thunderstorm Warning | MEG | Calhoun, Lafayette, Panola, Yalobusha | 33 min |
| Jul 19, 10:13 PM CDT | Severe Thunderstorm Warning | MEG | Fayette, Hardeman, Haywood, Madison | 18 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Little Rock, AR (KBYH), launched 00:00Z, 1.9 hours before the alert went out and 163 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
- 3860 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 1358 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 52 m²/s²
- 0-3 km storm-relative helicity
- 237 m²/s²
- Significant tornado parameter
- 2.1
- Supercell composite
- 21.5
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 7:07 PM CDT | Severe Thunderstorm Watch | SPC | Baxter, Boone, Carroll, Cleburne, Fulton, Independence and 10 more | 3 hr |
| Jul 19, 8:02 PM CDT | Mesoscale Discussion | SPC | Arkansas, Baxter, Clark, Cleburne, Cleveland, Conway and 40 more | 118 min |
| Jul 19, 11:21 PM CDT | Mesoscale Discussion | SPC | Chicot, Desha, Phillips | 114 min |
| Jul 20, 9:25 AM CDT | Mesoscale Discussion | SPC | Arkansas, Cleburne, Crittenden, Cross, Faulkner, Independence and 13 more | 2 hr |
| Jul 20, 12:58 PM CDT | Mesoscale Discussion | SPC | Clay | 62 min |
| Jul 20, 3:46 PM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Fulton, Izard, Marion, Randolph and 2 more | 59 min |
| Jul 20, 3:58 PM CDT | Severe Thunderstorm Watch | SPC | Baxter, Clay, Craighead, Cross, Fulton, Greene and 8 more | 6 hr |
| Jul 20, 5:54 PM CDT | Mesoscale Discussion | SPC | Crittenden, Lee, Phillips, St. Francis | 3 hr |
| Jul 20, 6:22 PM CDT | Tornado Watch | SPC | Crittenden, Lee, Mississippi, Phillips, St. Francis | 8 hr |
| Jul 20, 1:23 PM CDT | Mesoscale Discussion | SPC | Attala, Carroll, Choctaw, Clarke, Copiah, Covington and 20 more | 97 min |
| Jul 20, 2:11 PM CDT | Severe Thunderstorm Watch | SPC | Clarke, Covington, Forrest, Hinds, Jasper, Jefferson Davis and 14 more | 3 hr |
| Jul 20, 11:17 AM CDT | Mesoscale Discussion | SPC | Montgomery, Robertson, Stewart | 58 min |
| Jul 20, 6:24 PM CDT | Mesoscale Discussion | SPC | Campbell, Claiborne, Grainger, Hamblen, Hancock, Hawkins and 2 more | 96 min |
Nearby
Severe Thunderstorm Watches in Arkansas, 2018Severe Thunderstorm Watches in Mississippi, 2018Severe Thunderstorm Watches in Tennessee, 2018Every severe thunderstorm watch 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.