Alert archive / Arkansas / Severe Thunderstorm Watches in 2018

Severe Thunderstorm Watch 211

June 24, 201823 counties in Arkansas

The Storm Prediction Center issued this severe thunderstorm watch at Jun 24, 2018, 5:28 AM CDT for 23 counties in Arkansas. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Jun 24, 2018, 5:28 AM CDT (10:28 UTC)
Expired
Jun 24, 2018, 9:28 AM CDT
In force
4 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 23 counties

Clark County, AR, Conway County, AR, Crawford County, AR, Franklin County, AR, Garland County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Johnson County, AR, Little River County, AR, Logan County, AR, Montgomery County, AR, Nevada County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Saline County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Van Buren County, AR, Yell County, AR

The radar

The Western Arkansas radar (KSRX), 74 km from the middle of the area, began a volume at 10:29 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
40%
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
70%

Warnings issued inside it

16 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jun 24, 6:10 AM CDTSevere Thunderstorm WarningTSACrawford, Franklin, Sebastian50 min
Jun 24, 6:21 AM CDTSevere Thunderstorm WarningTSACrawford, Sebastian39 min
Jun 24, 6:29 AM CDTSevere Thunderstorm WarningLZKJohnson, Logan46 min
Jun 24, 6:49 AM CDTSevere Thunderstorm WarningTSACrawford, Franklin, Sebastian56 min
Jun 24, 6:54 AM CDTSevere Thunderstorm WarningSHVHoward, Sevier66 min
Jun 24, 6:57 AM CDTSevere Thunderstorm WarningLZKJohnson, Newton, Pope48 min
Jun 24, 7:09 AM CDTSevere Thunderstorm WarningLZKLogan, Scott, Yell51 min
Jun 24, 7:21 AM CDTSevere Thunderstorm WarningTSAFranklin24 min
Jun 24, 7:24 AM CDTSevere Thunderstorm WarningLZKJohnson, Logan, Newton, Pope, Yell51 min
Jun 24, 7:27 AM CDTSevere Thunderstorm WarningLZKMontgomery, Polk, Scott48 min
Jun 24, 7:29 AM CDTSevere Thunderstorm WarningLZKBoone, Johnson, Marion, Newton, Pope, Searcy46 min
Jun 24, 7:39 AM CDTSevere Thunderstorm WarningLZKConway, Logan, Pope, Scott, Yell51 min
Jun 24, 7:59 AM CDTSevere Thunderstorm WarningLZKGarland, Montgomery, Perry, Polk, Scott, Yell33 min
Jun 24, 8:05 AM CDTSevere Thunderstorm WarningLZKGarland, Montgomery, Pike, Polk21 min
Jun 24, 8:08 AM CDTSevere Thunderstorm WarningLZKCleburne, Conway, Faulkner, Johnson, Newton, Pope and 4 more52 min
Jun 24, 8:50 AM CDTSevere Thunderstorm WarningLZKBaxter, Izard, Marion, Searcy, Stone, Van Buren24 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

Springfield, MO (KSGF), launched 00:00Z, 10.5 hours before the alert went out and 221 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.

Skew-T log-pSkew-T log-p diagram, Springfield, MO at 00:00Z on 2018-06-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 735 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 00:00Z on 2018-06-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 28 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
735 J/kg
Mixed-layer CIN
-47 J/kg
Mixed-layer LCL
1678 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
28 m²/s²
0-3 km storm-relative helicity
72 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.5

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 24, 2:33 AM CDTMesoscale DiscussionSPCCleburne, Crittenden, Cross, Faulkner, Independence, Jackson and 11 more87 min
Jun 24, 5:11 AM CDTMesoscale DiscussionSPCCrawford, Franklin, Johnson, Logan, Montgomery, Perry and 6 more79 min
Jun 24, 7:37 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 47 more113 min
Jun 24, 4:18 PM CDTMesoscale DiscussionSPCGarland, Howard, Little River, Logan, Montgomery, Perry and 6 more117 min
Jun 24, 4:53 PM CDTSevere Thunderstorm WatchSPCBradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 22 more6 hr
Jun 24, 6:39 PM CDTMesoscale DiscussionSPCClay, Cleburne, Craighead, Cross, Greene, Independence and 6 more2 hr

Nearby

Severe Thunderstorm Watches in Arkansas, 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.