Alert archive / Arkansas / Severe Thunderstorm Watches in 2017
Severe Thunderstorm Watch 352
The Storm Prediction Center issued this severe thunderstorm watch at Jun 18, 2017, 9:43 AM CDT for 43 counties in Arkansas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 18, 2017, 9:43 AM CDT (14:43 UTC)
- Expired
- Jun 18, 2017, 4:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 43 counties
Arkansas County, AR, Clark County, AR, Cleburne County, AR, Cleveland County, AR, Conway County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Dallas County, AR, Desha County, AR, Faulkner County, AR, Garland County, AR, Grant County, AR, Hot Spring County, AR, Independence County, AR, Jackson County, AR, Jefferson County, AR, Johnson County, AR, Lee County, AR, Lincoln County, AR, Logan County, AR, Lonoke County, AR, Mississippi County, AR, Monroe County, AR, Montgomery County, AR, Newton County, AR, Perry County, AR, Phillips County, AR, Pike County, AR, Poinsett County, AR, Polk County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, St. Francis County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Yell County, AR
The radar
The Little Rock radar (KLZK), 36 km from the middle of the area, began a volume at 14:44 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
- 5%
- Ten or more severe wind reports
- 70%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 10:05 AM CDT | Severe Thunderstorm Warning | LZK | Conway, Logan, Pope, Van Buren, Yell | 55 min |
| Jun 18, 10:11 AM CDT | Severe Thunderstorm Warning | LZK | Garland, Montgomery, Pike, Polk, Scott, Yell | 64 min |
| Jun 18, 10:49 AM CDT | Severe Thunderstorm Warning | LZK | Garland, Hot Spring, Perry, Saline, Yell | 45 min |
| Jun 18, 11:24 AM CDT | Severe Thunderstorm Warning | LZK | Conway, Faulkner, Perry | 51 min |
| Jun 18, 11:59 AM CDT | Severe Thunderstorm Warning | LZK | Independence, Jackson | 35 min |
| Jun 18, 1:36 PM CDT | Severe Thunderstorm Warning | MEG | Cross, St. Francis | 39 min |
| Jun 18, 2:10 PM CDT | Severe Thunderstorm Warning | MEG | Crittenden, Lee, St. Francis | 50 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 12:00Z, 2.7 hours before the alert went out and 225 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
- 2261 J/kg
- Mixed-layer CIN
- -88 J/kg
- Mixed-layer LCL
- 859 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 63 m²/s²
- 0-3 km storm-relative helicity
- 64 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.9
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 4:14 AM CDT | Severe Thunderstorm Watch | SPC | Crawford, Franklin, Madison, Sebastian, Washington | 6 hr |
| Jun 18, 8:05 AM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Cleburne, Conway, Crawford, Faulkner and 30 more | 115 min |
| Jun 18, 12:36 PM CDT | Mesoscale Discussion | SPC | Arkansas, Cleburne, Cleveland, Craighead, Crittenden, Cross and 20 more | 114 min |
| Jun 18, 1:48 PM CDT | Mesoscale Discussion | SPC | Crittenden, Cross, Lee, Mississippi, Monroe, Phillips and 3 more | 117 min |
Nearby
Severe Thunderstorm Watches in Arkansas, 2017Every severe thunderstorm watch 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.