Alert archive / Arkansas / Tornado Watches in 2020

Tornado Watch 191

May 16, 20204 states

The Storm Prediction Center issued this tornado watch at May 16, 2020, 3:27 PM CDT for 4 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 16, 2020, 3:27 PM CDT (20:27 UTC)
Expired
May 16, 2020, 9:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
0.5 in
Strongest gust expected
60 kt
All 35 counties

Calhoun County, AR, Clark County, AR, Columbia County, AR, Dallas County, AR, Garland County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Pike County, AR, Polk County, AR, Sevier County, AR, Union County, AR, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, Union Parish, LA, Webster Parish, LA, McCurtain County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Franklin County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Red River County, TX, Titus County, TX, Upshur County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 149 km from the middle of the area, began a volume at 20:30 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
50%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
5%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
40%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 16, 3:36 PM CDTTornado WarningSHVBowie, Cass24 min
May 16, 3:44 PM CDTTornado WarningSHVMcCurtain46 min
May 16, 3:47 PM CDTTornado WarningSHVMcCurtain43 min
May 16, 3:56 PM CDTTornado WarningSHVLittle River49 min
May 16, 4:23 PM CDTTornado WarningSHVMcCurtain52 min
May 16, 4:27 PM CDTTornado WarningSHVBowie, Cass19 min
May 16, 4:37 PM CDTTornado Warning Tornado observedSHVLittle River38 min
May 16, 4:43 PM CDTTornado WarningSHVColumbia47 min
May 16, 5:00 PM CDTTornado WarningSHVBowie20 min
May 16, 5:12 PM CDTTornado WarningSHVMcCurtain48 min
May 16, 5:16 PM CDTTornado WarningSHVLittle River, Miller29 min
May 16, 5:16 PM CDTTornado WarningSHVColumbia, Union44 min
May 16, 5:19 PM CDTTornado WarningSHVColumbia, Lafayette, Nevada41 min
May 16, 5:35 PM CDTTornado WarningSHVHempstead, Howard, Little River, Miller, Sevier40 min
May 16, 5:42 PM CDTFlash Flood WarningSHVMcCurtain4 hr
May 16, 5:58 PM CDTTornado WarningSHVHempstead, Nevada47 min
May 16, 6:09 PM CDTTornado WarningSHVSevier37 min
May 16, 6:36 PM CDTFlash Flood WarningSHVHempstead, Howard, Little River, Sevier3 hr
May 16, 6:45 PM CDTTornado WarningSHVHempstead18 min
May 16, 6:47 PM CDTSevere Thunderstorm WarningLZKClark, Pike43 min
May 16, 6:48 PM CDTFlash Flood WarningSHVHempstead, Nevada117 min
May 16, 6:50 PM CDTTornado WarningLZKClark, Pike25 min
May 16, 7:30 PM CDTSevere Thunderstorm WarningLZKClark, Garland, Hot Spring, Montgomery, Pike35 min
May 16, 8:11 PM CDTFlash Flood WarningLZKClark, Garland, Hot Spring, Montgomery, Pike3 hr
May 16, 8:13 PM CDTTornado WarningSHVUnion32 min
May 16, 8:31 PM CDTSevere Thunderstorm WarningLZKCalhoun, Ouachita16 min
May 16, 8:32 PM CDTTornado WarningSHVUnion17 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

Shreveport, LA (KSHV), launched 12:00Z, 8.5 hours before the alert went out and 144 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 12:00Z on 2020-05-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 144 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 12:00Z on 2020-05-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 20 square meters per square second.1939Sfc1 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
144 J/kg
Mixed-layer CIN
-88 J/kg
Mixed-layer LCL
699 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
20 m²/s²
0-3 km storm-relative helicity
43 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

678 
WWUS20 KWNS 162023
SEL1  
SPC WW 162023
ARZ000-LAZ000-OKZ000-TXZ000-170200-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 191
NWS Storm Prediction Center Norman OK
325 PM CDT Sat May 16 2020

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  southwest Arkansas
  northwest Louisiana
  southeast Oklahoma
  northeast Texas

* Effective this Saturday afternoon and evening from 325 PM until
  900 PM CDT.

* Primary threats include...
  A few tornadoes possible
  Isolated damaging wind gusts to 70 mph possible

SUMMARY...Low topped supercells may remain capable of producing a
few tornadoes in the Ark-La-Tex region this afternoon into early
evening.

The tornado watch area is approximately along and 75 statute miles
east and west of a line from 35 miles north of De Queen AR to 45
miles south southwest of El Dorado AR. For a complete depiction of
the watch see the associated watch outline update (WOUS64 KWNS
WOU1).

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.

&&

AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 0.5 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 400. Mean
storm motion vector 18030.

...Dial

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 16, 1:16 PM CDTMesoscale DiscussionSPCAshley, Bradley, Calhoun, Clark, Cleveland, Columbia and 19 more2 hr
May 16, 5:31 PM CDTMesoscale DiscussionSPCColumbia, Hempstead, Howard, Lafayette, Little River, Miller and 4 more59 min
May 16, 6:21 PM CDTMesoscale DiscussionSPCAshley, Chicot, Drew84 min
May 15, 8:18 PM CDTMesoscale DiscussionSPCBeaver, Cimarron, Texas2 hr
May 15, 8:56 PM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bastrop, Bee, Bell, Bexar and 71 more2 hr
May 15, 9:14 PM CDTSevere Thunderstorm WatchSPCAransas, Atascosa, Bandera, Bastrop, Bee, Bell and 66 more7 hr
May 15, 11:44 PM CDTMesoscale DiscussionSPCAransas, Atascosa, Austin, Bastrop, Bee, Bell and 48 more2 hr
May 16, 12:54 AM CDTSevere Thunderstorm WatchSPCAustin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 6 more4 hr
May 16, 1:31 AM CDTMesoscale DiscussionSPCAransas, Brooks, Calhoun, Duval, Goliad, Hidalgo and 11 more89 min

Nearby

Tornado Watches in Arkansas, 2020Tornado Watches in Texas, 2020Tornado Watches in Louisiana, 2020Every tornado watch in 2020

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.