Alert archive / Arkansas / Severe Thunderstorm Watches in 2011

Severe Thunderstorm Watch 199

April 25, 20114 states

The Storm Prediction Center issued this severe thunderstorm watch at Apr 25, 2011, 4:41 AM CDT for 4 states. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Apr 25, 2011, 4:41 AM CDT (09:41 UTC)
Expired
Apr 25, 2011, 12:00 PM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 67 counties

Arkansas County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Jefferson County, AR, Lafayette 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, Pike County, AR, Polk County, AR, Prairie County, AR, Saline County, AR, Scott County, AR, Sevier County, AR, Union County, AR, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, Webster Parish, LA, Choctaw County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, Pushmataha County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Collin County, TX, Dallas County, TX, Delta County, TX, Ellis County, TX, Fannin County, TX, Franklin County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Hopkins County, TX, Hunt County, TX, Kaufman County, TX, Lamar County, TX, Marion County, TX, Morris County, TX, Navarro County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 161 km from the middle of the area, began a volume at 09:42 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
20%
One or more EF2 to EF5 tornadoes
5%
Ten or more severe wind reports
40%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 25, 5:13 AM CDTSevere Thunderstorm WarningTSAChoctaw, LeFlore, Pushmataha77 min
Apr 25, 5:19 AM CDTSevere Thunderstorm WarningSHVMcCurtain56 min
Apr 25, 6:01 AM CDTSevere Thunderstorm WarningLZKPolk44 min
Apr 25, 6:14 AM CDTSevere Thunderstorm WarningSHVHoward, Little River, Sevier61 min
Apr 25, 6:35 AM CDTSevere Thunderstorm WarningTSALeFlore25 min
Apr 25, 6:48 AM CDTSevere Thunderstorm WarningLZKMontgomery, Pike, Polk57 min
Apr 25, 7:11 AM CDTSevere Thunderstorm WarningSHVHempstead, Howard, Little River, Sevier64 min
Apr 25, 8:01 AM CDTSevere Thunderstorm WarningLZKClark, Dallas, Grant, Hot Spring44 min
Apr 25, 8:39 AM CDTSevere Thunderstorm WarningLZKCleveland, Dallas, Grant, Hot Spring, Jefferson, Saline51 min
Apr 25, 8:47 AM CDTSevere Thunderstorm WarningSHVHempstead, Little River, Miller, Nevada43 min
Apr 25, 9:05 AM CDTTornado WarningSHVHempstead, Nevada25 min
Apr 25, 9:19 AM CDTSevere Thunderstorm WarningLZKArkansas, Grant, Jefferson, Lonoke, Prairie, Pulaski and 1 more41 min
Apr 25, 9:26 AM CDTTornado WarningSHVHempstead, Nevada19 min
Apr 25, 9:35 AM CDTSevere Thunderstorm WarningLZKClark, Dallas, Hot Spring, Ouachita, Pike40 min
Apr 25, 9:54 AM CDTSevere Thunderstorm WarningLZKArkansas, Jefferson, Lonoke, Monroe, Prairie51 min
Apr 25, 10:11 AM CDTFlash Flood WarningLZKClark, Cleveland, Dallas, Grant, Hot Spring, Jefferson and 1 more3 hr
Apr 25, 10:32 AM CDTSevere Thunderstorm WarningFWDCollin, Dallas, Kaufman, Rockwall58 min
Apr 25, 10:54 AM CDTSevere Thunderstorm WarningFWDDelta, Lamar66 min
Apr 25, 11:00 AM CDTSevere Thunderstorm WarningFWDCollin, Fannin, Hunt60 min
Apr 25, 11:50 AM CDTFlash Flood WarningTSALeFlore, Sequoyah6 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 (KSHV), launched 00:00Z, 9.7 hours before the alert went out and 164 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 2011-04-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 253 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 2011-04-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 44 square meters per square second.193958Sfc1 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
253 J/kg
Mixed-layer CIN
-162 J/kg
Mixed-layer LCL
1930 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
44 m²/s²
0-3 km storm-relative helicity
72 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 24, 10:13 PM CDTMesoscale DiscussionSPCClark, Cleburne, Conway, Faulkner, Garland, Grant and 15 more2 hr
Apr 24, 11:43 PM CDTSevere Thunderstorm WatchSPCHempstead, Howard, Little River, Miller, Nevada, Sevier5 hr
Apr 25, 1:57 AM CDTMesoscale DiscussionSPCCleveland, Dallas, Jefferson, Lincoln63 min
Apr 25, 7:23 AM CDTMesoscale DiscussionSPCCalhoun, Clark, Cleveland, Columbia, Dallas, Garland and 11 more97 min
Apr 25, 8:37 AM CDTMesoscale DiscussionSPCArkansas, Cleveland, Crittenden, Desha, Drew, Jefferson and 7 more53 min
Apr 25, 9:17 AM CDTSevere Thunderstorm WatchSPCCrittenden, Lee, Phillips, St. Francis6 hr
Apr 25, 10:46 AM CDTMesoscale DiscussionSPCHempstead, Howard, Lafayette, Little River, Miller, Sevier59 min
Apr 25, 11:00 AM CDTTornado WatchSPCCarroll, Clark, Crawford, Franklin, Hempstead, Howard and 13 more7 hr
Apr 25, 1:15 PM CDTMesoscale DiscussionSPCCrittenden, Cross, Lee, Phillips, St. Francis60 min
Apr 25, 1:28 PM CDTMesoscale DiscussionSPCCrawford, Franklin, Howard, Johnson, Little River, Logan and 5 more92 min
Apr 25, 3:08 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Baxter, Boone, Bradley, Calhoun and 29 more37 min
Apr 25, 3:22 PM CDTTornado Watch PDSSPCArkansas, Baxter, Boone, Bradley, Calhoun, Clark and 50 more8 hr
Apr 25, 4:34 PM CDTMesoscale DiscussionSPCArkansas, Clay, Craighead, Crittenden, Cross, Greene and 11 more56 min
Apr 25, 4:50 PM CDTTornado Watch PDSSPCClay, Craighead, Crittenden, Cross, Greene, Lee and 4 more7 hr
Apr 24, 7:35 PM CDTMesoscale DiscussionSPCBeaver2 hr
Apr 24, 11:58 PM CDTMesoscale DiscussionSPCAlfalfa, Beaver, Blaine, Canadian, Custer, Dewey and 14 more92 min
Apr 25, 5:24 PM CDTMesoscale DiscussionSPCBeckham, Caddo, Canadian, Cleveland, Comanche, Cotton and 13 more66 min
Apr 24, 8:48 PM CDTMesoscale DiscussionSPCBosque, Brown, Callahan, Coleman, Collin, Comanche and 36 more117 min
Apr 24, 11:25 PM CDTMesoscale DiscussionSPCBosque, Brown, Callahan, Camp, Coke, Coleman and 39 more65 min
Apr 25, 3:29 AM CDTMesoscale DiscussionSPCBosque, Camp, Collin, Dallas, Delta, Denton and 24 more61 min
Apr 25, 2:16 PM CDTMesoscale DiscussionSPCAngelina, Bastrop, Bell, Blanco, Brazos, Burleson and 27 more59 min
Apr 25, 2:41 PM CDTTornado WatchSPCAnderson, Angelina, Bastrop, Bell, Blanco, Bosque and 49 more9 hr
Apr 25, 5:21 PM CDTMesoscale DiscussionSPCBosque, Delta, Ellis, Henderson, Hill, Hopkins and 7 more54 min
Apr 25, 6:57 PM CDTMesoscale DiscussionSPCAnderson, Angelina, Bell, Blanco, Brazos, Burleson and 22 more2 hr

Nearby

Severe Thunderstorm Watches in Arkansas, 2011Severe Thunderstorm Watches in Texas, 2011Severe Thunderstorm Watches in Oklahoma, 2011Every severe thunderstorm watch in 2011

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.