Alert archive / Arkansas / Tornado Watches in 2017

Tornado Watch 162

April 26, 201757 counties in Arkansas; 9 parishes in Louisiana; 13 counties in Texas

The Storm Prediction Center issued this tornado watch at Apr 26, 2017, 10:08 AM CDT for 57 counties in Arkansas; 9 parishes in Louisiana; 13 counties in Texas. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Apr 26, 2017, 10:08 AM CDT (15:08 UTC)
Expired
Apr 26, 2017, 5:00 PM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 79 counties

Arkansas County, AR, Baxter County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Clay County, AR, Cleburne County, AR, Cleveland County, AR, Columbia County, AR, Conway County, AR, Craighead County, AR, Cross County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Faulkner County, AR, Fulton County, AR, Garland County, AR, Grant County, AR, Greene County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Jefferson County, AR, Lafayette County, AR, Lawrence County, AR, Lee 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, Perry County, AR, Phillips County, AR, Pike County, AR, Poinsett County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Searcy County, AR, Sevier County, AR, Sharp County, AR, St. Francis County, AR, Stone County, AR, Union County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Yell County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Lincoln Parish, LA, Red River Parish, LA, Union Parish, LA, Webster Parish, LA, Bowie County, TX, Camp County, TX, Cass County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Panola County, TX, Rusk County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Wood County, TX

The radar

The Little Rock radar (KLZK), 34 km from the middle of the area, began a volume at 15:09 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
70%
One or more EF2 to EF5 tornadoes
50%
Ten or more severe wind reports
80%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
80%
One or more hailstones of 2 inches or more
50%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 26, 10:08 AM CDTSevere Thunderstorm WarningSHVHoward, Sevier52 min
Apr 26, 10:11 AM CDTSevere Thunderstorm WarningLZKConway, Newton, Pope, Searcy, Van Buren49 min
Apr 26, 10:23 AM CDTSevere Thunderstorm WarningLZKConway, Faulkner, Pope37 min
Apr 26, 10:27 AM CDTSevere Thunderstorm WarningLZKGarland, Montgomery, Perry, Scott, Yell33 min
Apr 26, 10:28 AM CDTTornado WarningLZKConway, Faulkner, Pope, Van Buren26 min
Apr 26, 10:44 AM CDTSevere Thunderstorm WarningLZKCleburne, Conway, Faulkner, Searcy, Stone, Van Buren46 min
Apr 26, 11:16 AM CDTFlash Flood WarningLZKBoone, Johnson, Marion, Newton, Pope, Searcy3 hr
Apr 26, 11:51 AM CDTSevere Thunderstorm WarningLZKFulton, Izard, Sharp12 min
Apr 26, 12:18 PM CDTSevere Thunderstorm WarningSHVHoward, Little River, Sevier42 min
Apr 26, 12:35 PM CDTSevere Thunderstorm WarningSHVBowie, Camp, Franklin, Morris, Red River, Titus40 min
Apr 26, 1:32 PM CDTSevere Thunderstorm WarningSHVSmith, Upshur, Wood43 min
Apr 26, 2:01 PM CDTFlash Flood WarningLZKGarland, Montgomery3 hr
Apr 26, 2:38 PM CDTFlash Flood WarningLZKConway, Perry3 hr
Apr 26, 2:56 PM CDTSevere Thunderstorm WarningLZKDallas, Grant, Hot Spring, Saline34 min
Apr 26, 3:09 PM CDTSevere Thunderstorm WarningSHVCass, Harrison, Marion17 min
Apr 26, 3:19 PM CDTSevere Thunderstorm WarningSHVHarrison, Panola, Rusk41 min
Apr 26, 3:42 PM CDTSevere Thunderstorm WarningSHVColumbia, Nevada48 min
Apr 26, 3:43 PM CDTFlash Flood WarningLZKClark, Dallas, Grant, Hot Spring, Lonoke, Ouachita and 2 more3 hr
Apr 26, 4:04 PM CDTSevere Thunderstorm WarningSHVColumbia, Lafayette24 min
Apr 26, 4:07 PM CDTSevere Thunderstorm WarningLZKArkansas, Lonoke, Monroe, Prairie53 min
Apr 26, 4:11 PM CDTTornado WarningLZKArkansas, Jefferson, Lonoke, Prairie34 min
Apr 26, 4:18 PM CDTSevere Thunderstorm WarningLZKCalhoun, Dallas, Ouachita57 min
Apr 26, 4:21 PM CDTTornado WarningLZKMonroe, Prairie, Woodruff39 min
Apr 26, 4:28 PM CDTSevere Thunderstorm WarningSHVColumbia24 min
Apr 26, 4:33 PM CDTSevere Thunderstorm WarningLZKMonroe, Prairie, Woodruff42 min
Apr 26, 4:46 PM CDTSevere Thunderstorm WarningLZKJackson, Woodruff44 min
Apr 26, 4:49 PM CDTSevere Thunderstorm WarningMEGCrittenden, Cross, Poinsett, St. Francis41 min
Apr 26, 4:53 PM CDTFlash Flood WarningMEGCraighead, Greene, Lawrence, Randolph3 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

Little Rock, AR (KBYH), launched 12:00Z, 3.1 hours before the alert went out and 242 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, Little Rock, AR at 12:00Z on 2017-04-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 271 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, Little Rock, AR at 12:00Z on 2017-04-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 129 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
271 J/kg
Mixed-layer CIN
-181 J/kg
Mixed-layer LCL
821 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
129 m²/s²
0-3 km storm-relative helicity
160 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.9

Open this sounding in Storm Lab

The text

As transmitted.

313 
WWUS20 KWNS 261505
SEL2  
SPC WW 261505
ARZ000-LAZ000-TXZ000-262200-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 162
NWS Storm Prediction Center Norman OK
1005 AM CDT Wed Apr 26 2017

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Much of Arkansas
  Northwest Louisiana
  Northeast Texas

* Effective this Wednesday morning and afternoon from 1005 AM
  until 500 PM CDT.

* Primary threats include...
  A few tornadoes likely with a couple intense tornadoes possible
  Widespread large hail likely with isolated very large hail
    events to 2 inches in diameter possible
  Widespread damaging wind gusts to 70 mph likely

SUMMARY...Severe storms will move across the watch area through this
afternoon, posing a risk of locally damaging winds, large hail, and
a few tornadoes.  An isolated strong tornado or two is also
possible.

The tornado watch area is approximately along and 90 statute miles
east and west of a line from 25 miles north of Walnut Ridge AR to 35
miles southeast of Longview TX. For a complete depiction of the
watch see the associated watch outline update (WOUS64 KWNS WOU2).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and severe thunderstorms in and close to the watch
area. Persons in these areas should be on the lookout for
threatening weather conditions and listen for later statements
and possible warnings.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 161...WW 9997...

AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 2 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 24035.

...Hart

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 25, 10:51 PM CDTMesoscale DiscussionSPCBenton, Boone, Carroll, Madison, Washington54 min
Apr 25, 11:27 PM CDTSevere Thunderstorm WatchSPCBenton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more7 hr
Apr 26, 1:42 AM CDTMesoscale DiscussionSPCBaxter, Boone, Carroll, Crawford, Franklin, Johnson and 10 more2 hr
Apr 26, 5:37 AM CDTMesoscale DiscussionSPCConway, Crawford, Franklin, Garland, Howard, Johnson and 14 more113 min
Apr 26, 6:00 AM CDTSevere Thunderstorm WatchSPCBaxter, Boone, Carroll, Conway, Crawford, Franklin and 23 more7 hr
Apr 26, 7:29 AM CDTMesoscale DiscussionSPCBaxter, Boone, Carroll, Conway, Crawford, Franklin and 23 more2 hr
Apr 26, 9:39 AM CDTMesoscale DiscussionSPCArkansas, Baxter, Bradley, Calhoun, Clark, Clay and 47 more36 min
Apr 26, 1:05 PM CDTMesoscale DiscussionSPCClark, Columbia, Dallas, Grant, Hempstead, Hot Spring and 9 more85 min
Apr 26, 3:53 PM CDTMesoscale DiscussionSPCClay97 min
Apr 26, 4:23 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 19 more67 min
Apr 26, 4:44 PM CDTTornado WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 11 more5 hr
Apr 26, 5:02 PM CDTSevere Thunderstorm WatchSPCClay, Craighead, Crittenden, Cross, Greene, Lee and 4 more6 hr
Apr 26, 6:10 PM CDTMesoscale DiscussionSPCMississippi95 min
Apr 25, 7:14 PM CDTMesoscale DiscussionSPCMcDonald91 min
Apr 26, 12:26 PM CDTMesoscale DiscussionSPCBollinger, Butler, Cape Girardeau, Carter, Madison, Mississippi and 6 more94 min
Apr 26, 12:46 PM CDTSevere Thunderstorm WatchSPCBollinger, Butler, Cape Girardeau, Carter, Madison, Perry and 6 more6 hr

Nearby

Tornado Watches in Arkansas, 2017Tornado Watches in Texas, 2017Tornado Watches in Louisiana, 2017Every tornado 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.