Alert archive / Arkansas / Tornado Watches in 2021

Tornado Watch 60

March 27, 202137 counties in Arkansas; 11 parishes in Louisiana; 17 counties in Texas

The Storm Prediction Center issued this tornado watch at Mar 27, 2021, 3:25 PM CDT for 37 counties in Arkansas; 11 parishes in Louisiana; 17 counties in Texas. It was in force for 10 hr.

The area

The outline as issued.

The facts

Issued
Mar 27, 2021, 3:25 PM CDT (20:25 UTC)
Expired
Mar 28, 2021, 1:00 AM CDT
In force
10 hr
Issued by
the Storm Prediction Center
Largest hail expected
3 in
Strongest gust expected
65 kt
All 65 counties

Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Faulkner County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Howard County, AR, Jackson 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, Perry County, AR, Pike County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Sevier County, AR, Union County, AR, White County, AR, Woodruff County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Lincoln Parish, LA, Morehouse Parish, LA, Red River Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Bowie County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Franklin County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Nacogdoches County, TX, Panola County, TX, Rusk County, TX, Shelby County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Wood County, TX

The radar

The Little Rock radar (KLZK), 156 km from the middle of the area, began a volume at 20:28 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
60%
Ten or more severe wind reports
70%
One or more gusts of 65 knots or more
40%
Ten or more severe hail reports
90%
One or more hailstones of 2 inches or more
80%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Mar 27, 4:06 PM CDTSevere Thunderstorm WarningLZKClark, Ouachita39 min
Mar 27, 4:37 PM CDTSevere Thunderstorm WarningLZKClark, Dallas, Ouachita38 min
Mar 27, 5:05 PM CDTSevere Thunderstorm WarningSHVHempstead, Howard, Little River, Sevier40 min
Mar 27, 5:08 PM CDTSevere Thunderstorm WarningLZKLonoke, Prairie, Pulaski37 min
Mar 27, 5:11 PM CDTSevere Thunderstorm WarningLZKCleveland, Dallas, Grant, Hot Spring, Jefferson, Saline49 min
Mar 27, 5:21 PM CDTSevere Thunderstorm WarningLZKWoodruff24 min
Mar 27, 5:27 PM CDTSevere Thunderstorm WarningLZKLonoke, Prairie48 min
Mar 27, 5:30 PM CDTSevere Thunderstorm WarningLZKMonroe, Prairie, Woodruff45 min
Mar 27, 5:34 PM CDTSevere Thunderstorm WarningSHVHempstead, Nevada26 min
Mar 27, 5:37 PM CDTSevere Thunderstorm WarningLZKGrant, Lonoke, Pulaski, Saline53 min
Mar 27, 5:55 PM CDTSevere Thunderstorm WarningSHVCherokee, Nacogdoches, Rusk50 min
Mar 27, 5:56 PM CDTFlash Flood WarningLZKLonoke, Monroe, Prairie, Woodruff3 hr
Mar 27, 5:57 PM CDTSevere Thunderstorm WarningLZKJackson, Lonoke, Prairie, White, Woodruff48 min
Mar 27, 5:59 PM CDTSevere Thunderstorm WarningSHVHempstead, Nevada23 min
Mar 27, 6:02 PM CDTSevere Thunderstorm WarningLZKArkansas, Jefferson, Lonoke, Monroe, Prairie43 min
Mar 27, 6:03 PM CDTTornado WarningSHVCherokee27 min
Mar 27, 6:04 PM CDTSevere Thunderstorm WarningLZKClark, Pike41 min
Mar 27, 6:09 PM CDTSevere Thunderstorm WarningLZKMonroe, Prairie, Woodruff51 min
Mar 27, 6:12 PM CDTSevere Thunderstorm WarningLZKLonoke, Prairie, Pulaski, White48 min
Mar 27, 6:24 PM CDTSevere Thunderstorm WarningLZKClark, Dallas, Hot Spring, Ouachita51 min
Mar 27, 6:27 PM CDTTornado WarningSHVCherokee, Nacogdoches, Rusk48 min
Mar 27, 6:31 PM CDTSevere Thunderstorm WarningSHVBowie, Cass59 min
Mar 27, 6:37 PM CDTSevere Thunderstorm WarningLZKArkansas, Jefferson, Lonoke, Monroe, Prairie38 min
Mar 27, 6:42 PM CDTSevere Thunderstorm WarningLZKMonroe, Woodruff37 min
Mar 27, 6:48 PM CDTTornado WarningLZKArkansas, Monroe, Prairie42 min
Mar 27, 6:50 PM CDTSevere Thunderstorm WarningLZKWhite40 min
Mar 27, 6:54 PM CDTTornado Warning Tornado observedConsiderable damage threatSHVPanola, Rusk, Shelby51 min
Mar 27, 6:58 PM CDTSevere Thunderstorm WarningLZKCleveland, Dallas, Grant, Jefferson47 min
Mar 27, 7:00 PM CDTTornado WarningLZKCleveland, Dallas, Grant, Jefferson45 min
Mar 27, 7:12 PM CDTSevere Thunderstorm WarningLZKBradley, Calhoun, Cleveland, Dallas, Ouachita48 min
Mar 27, 7:20 PM CDTSevere Thunderstorm WarningSHVHempstead, Lafayette, Miller40 min
Mar 27, 7:22 PM CDTSevere Thunderstorm WarningLZKIndependence, Jackson, Lawrence38 min
Mar 27, 7:23 PM CDTFlash Flood WarningLZKClark, Cleveland, Dallas, Grant, Hot Spring, Jefferson and 1 more3 hr
Mar 27, 7:24 PM CDTSevere Thunderstorm WarningLZKIndependence, Izard, Jackson, Sharp, White, Woodruff51 min
Mar 27, 7:25 PM CDTTornado WarningLZKBradley, Calhoun, Cleveland, Dallas, Ouachita35 min
Mar 27, 7:31 PM CDTTornado WarningSHVHarrison, Marion44 min
Mar 27, 7:34 PM CDTTornado WarningLZKArkansas, Cleveland, Jefferson, Lincoln41 min
Mar 27, 7:39 PM CDTTornado Warning Tornado observedConsiderable damage threatSHVCaddo, De Soto51 min
Mar 27, 7:56 PM CDTTornado WarningLZKBradley, Cleveland, Drew, Lincoln49 min
Mar 27, 7:56 PM CDTSevere Thunderstorm WarningSHVColumbia, Hempstead, Lafayette, Miller, Nevada49 min
Mar 27, 8:04 PM CDTTornado WarningSHVBossier, Caddo41 min
Mar 27, 8:07 PM CDTTornado WarningLZKArkansas, Desha, Jefferson, Lincoln, Monroe53 min
Mar 27, 8:11 PM CDTTornado WarningSHVCaddo, De Soto49 min
Mar 27, 8:13 PM CDTSevere Thunderstorm WarningLZKIndependence, Jackson, Lawrence, Randolph32 min
Mar 27, 8:20 PM CDTSevere Thunderstorm WarningLZKCalhoun, Ouachita55 min
Mar 27, 8:41 PM CDTTornado WarningLZKArkansas, Desha, Drew, Lincoln49 min
Mar 27, 8:46 PM CDTTornado WarningSHVBienville, Bossier, Caddo, Webster19 min
Mar 27, 8:49 PM CDTTornado WarningLZKArkansas, Monroe29 min
Mar 27, 9:08 PM CDTSevere Thunderstorm WarningLZKBradley, Calhoun, Ouachita53 min
Mar 27, 9:21 PM CDTFlash Flood WarningLZKOuachita3 hr
Mar 27, 9:26 PM CDTTornado WarningLZKArkansas, Desha34 min
Mar 27, 9:32 PM CDTTornado WarningLZKBradley, Calhoun43 min
Mar 27, 9:47 PM CDTFlash Flood WarningLZKBradley, Calhoun, Cleveland, Dallas, Ouachita4 hr
Mar 27, 9:52 PM CDTSevere Thunderstorm WarningSHVHarrison, Panola, Rusk53 min
Mar 27, 9:57 PM CDTTornado WarningLZKBradley, Cleveland, Drew, Lincoln48 min
Mar 27, 10:23 PM CDTSevere Thunderstorm WarningSHVUnion67 min
Mar 27, 10:34 PM CDTSevere Thunderstorm WarningLZKDesha, Drew56 min
Mar 27, 10:39 PM CDTSevere Thunderstorm WarningSHVBossier, Caddo51 min
Mar 27, 10:59 PM CDTSevere Thunderstorm WarningJANChicot61 min
Mar 27, 11:22 PM CDTSevere Thunderstorm WarningJANAshley, Chicot53 min
Mar 27, 11:30 PM CDTSevere Thunderstorm WarningSHVBienville, Bossier, Claiborne, Webster45 min
Mar 28, 12:09 AM CDTSevere Thunderstorm WarningLZKDesha, Drew24 min
Mar 28, 12:11 AM CDTSevere Thunderstorm WarningJANAshley, Chicot27 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, 8.4 hours before the alert went out and 149 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 2021-03-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 951 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Shreveport, LA at 12:00Z on 2021-03-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 192 square meters per square second.1939587897Sfc1 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
951 J/kg
Mixed-layer CIN
-50 J/kg
Mixed-layer LCL
670 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
192 m²/s²
0-3 km storm-relative helicity
238 m²/s²
Significant tornado parameter
0.8
Supercell composite
5.6

Open this sounding in Storm Lab

The text

As transmitted.

356 
WWUS20 KWNS 272021
SEL0  
SPC WW 272021
ARZ000-LAZ000-MSZ000-TXZ000-280400-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 60
NWS Storm Prediction Center Norman OK
320 PM CDT Sat Mar 27 2021

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Southern and eastern Arkansas
  Northern Louisiana
  Extreme northwestern Mississippi
  Northeastern Texas

* Effective this Saturday afternoon and evening from 320 PM until
  1100 PM CDT.

* Primary threats include...
  A few tornadoes and a couple intense tornadoes likely
  Widespread large hail and scattered very large hail events to 3
    inches in diameter likely
  Scattered damaging winds likely with isolated significant gusts
    to 75 mph possible

SUMMARY...Scattered supercell development is expected this afternoon
from northeastern Texas across northwestern Louisiana into southern
and eastern Arkansas.  The storms will persist through late evening
and expand in coverage, with the potential to produce very large
hail, damaging winds, and several tornadoes.  A couple of strong
tornadoes will be possible, mainly later this evening across
southeast Arkansas.

The tornado watch area is approximately along and 75 statute miles
north and south of a line from 55 miles east northeast of Pine Bluff
AR to 25 miles west northwest of Longview TX. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU0).

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 58...WW 59...

AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 3 inches. Extreme turbulence and surface wind
gusts to 65 knots. A few cumulonimbi with maximum tops to 550. Mean
storm motion vector 24030.

...Thompson

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 27, 11:55 AM CDTMesoscale DiscussionSPCCrittenden, Cross, Lee, Mississippi, Poinsett, St. Francis3 hr
Mar 27, 1:51 PM CDTTornado WatchSPCCrittenden, Cross, Lee, Mississippi, Phillips, Poinsett and 1 more7 hr
Mar 27, 2:16 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Clark, Cleveland and 26 more89 min
Mar 27, 6:42 PM CDTMesoscale DiscussionSPCArkansas, Bradley, Calhoun, Clark, Cleveland, Columbia and 29 more2 hr
Mar 27, 4:34 PM CDTMesoscale DiscussionSPCAnderson, Brazos, Freestone, Henderson, Hopkins, Houston and 9 more116 min

Nearby

Tornado Watches in Arkansas, 2021Tornado Watches in Texas, 2021Tornado Watches in Louisiana, 2021Every tornado watch in 2021

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.