Alert archive / Arkansas / Severe Thunderstorm Watches in 2016

Severe Thunderstorm Watch 123

April 29, 201631 counties in Arkansas; 8 counties in Oklahoma

The Storm Prediction Center issued this severe thunderstorm watch at Apr 29, 2016, 4:21 AM CDT for 31 counties in Arkansas; 8 counties in Oklahoma. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Apr 29, 2016, 4:21 AM CDT (09:21 UTC)
Expired
Apr 29, 2016, 10:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
50 kt
All 39 counties

Arkansas County, AR, Clark County, AR, Cleveland County, AR, Conway County, AR, Crawford County, AR, Dallas County, AR, Faulkner County, AR, Franklin County, AR, Garland County, AR, Grant County, AR, Hot Spring County, AR, Jefferson County, AR, Johnson County, AR, Lincoln County, AR, Logan County, AR, Lonoke County, AR, Monroe County, AR, Montgomery 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, Sebastian County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McIntosh County, OK, Muskogee County, OK, Pittsburg County, OK, Pushmataha County, OK, Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 46 km from the middle of the area, began a volume at 09:25 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
10%
One or more gusts of 65 knots or more
5%
Ten or more severe hail reports
50%
One or more hailstones of 2 inches or more
40%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 29, 4:28 AM CDTSevere Thunderstorm WarningTSALatimer, LeFlore, Pushmataha47 min
Apr 29, 4:40 AM CDTSevere Thunderstorm WarningLZKMontgomery, Polk65 min
Apr 29, 5:20 AM CDTSevere Thunderstorm WarningLZKMontgomery, Pike, Polk55 min
Apr 29, 6:06 AM CDTSevere Thunderstorm WarningLZKClark, Garland, Hot Spring, Montgomery, Pike54 min
Apr 29, 6:19 AM CDTSevere Thunderstorm WarningLZKClark, Dallas26 min
Apr 29, 6:25 AM CDTSevere Thunderstorm WarningLZKGarland, Montgomery, Perry34 min
Apr 29, 6:41 AM CDTSevere Thunderstorm WarningLZKClark, Hot Spring23 min
Apr 29, 6:42 AM CDTSevere Thunderstorm WarningLZKClark, Dallas33 min
Apr 29, 7:56 AM CDTFlash Flood WarningLZKMontgomery, Pike, Polk6 hr
Apr 29, 8:57 AM CDTFlash Flood WarningLZKPulaski, Saline5 hr

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Shreveport, LA (KBAD), launched 00:00Z, 9.4 hours before the alert went out and 272 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, Shreveport, LA at 00:00Z on 2016-04-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 101 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, Shreveport, LA at 00:00Z on 2016-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -21 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
101 J/kg
Mixed-layer CIN
-347 J/kg
Mixed-layer LCL
2092 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
-21 m²/s²
0-3 km storm-relative helicity
104 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 29, 1:58 AM CDTMesoscale DiscussionSPCClark, Columbia, Dallas, Garland, Hempstead, Hot Spring and 11 more2 hr
Apr 29, 7:06 AM CDTMesoscale DiscussionSPCArkansas, Bradley, Calhoun, Clark, Cleveland, Dallas and 5 more54 min
Apr 29, 9:46 AM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 29 more89 min
Apr 29, 12:51 PM CDTMesoscale DiscussionSPCBradley, Calhoun, Clark, Columbia, Hempstead, Howard and 8 more114 min
Apr 29, 1:43 PM CDTTornado WatchSPCBradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 10 more8 hr
Apr 29, 5:42 PM CDTMesoscale DiscussionSPCBradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 11 more93 min
Apr 28, 10:54 PM CDTSevere Thunderstorm WatchSPCBeaver, Cimarron, Texas7 hr
Apr 29, 2:59 AM CDTMesoscale DiscussionSPCBeaver, Ellis, Harper91 min
Apr 29, 4:54 AM CDTMesoscale DiscussionSPCHarmon66 min
Apr 29, 1:40 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Carter, Cleveland, Coal, Comanche and 15 more65 min
Apr 29, 1:57 PM CDTTornado WatchSPCAtoka, Bryan, Caddo, Canadian, Carter, Choctaw and 27 more8 hr
Apr 29, 3:56 PM CDTMesoscale DiscussionSPCAtoka, Bryan, Caddo, Carter, Cleveland, Coal and 18 more64 min
Apr 29, 6:16 PM CDTMesoscale DiscussionSPCAdair, Atoka, Bryan, Carter, Cherokee, Choctaw and 25 more89 min

Nearby

Severe Thunderstorm Watches in Arkansas, 2016Severe Thunderstorm Watches in Oklahoma, 2016Every severe thunderstorm watch in 2016

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.