Alert archive / Arkansas / Tornado Watches in 2019

Tornado Watch 679

October 20, 201947 counties in Arkansas

The Storm Prediction Center issued this tornado watch at Oct 20, 2019, 11:48 PM CDT for 47 counties in Arkansas. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
Oct 20, 2019, 11:48 PM CDT (04:48 UTC)
Expired
Oct 21, 2019, 7:18 AM CDT
In force
8 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
70 kt
All 47 counties

Arkansas County, AR, Baxter County, AR, Boone County, AR, Bradley County, AR, Calhoun County, AR, Clark County, AR, Cleburne County, AR, Cleveland County, AR, Conway County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Faulkner County, AR, Fulton County, AR, Garland County, AR, Grant County, AR, Hot Spring County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Jefferson County, AR, Johnson County, AR, Lawrence County, AR, Lincoln County, AR, Logan County, AR, Lonoke County, AR, Marion County, AR, Monroe County, AR, Montgomery County, AR, Newton County, AR, Ouachita County, AR, Perry County, AR, Pike County, AR, Polk County, AR, Pope County, AR, Prairie County, AR, Pulaski County, AR, Randolph County, AR, Saline County, AR, Scott County, AR, Searcy County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR, White County, AR, Woodruff County, AR, Yell County, AR

The radar

The Little Rock radar (KLZK), 62 km from the middle of the area, began a volume at 04:47 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
60%
One or more EF2 to EF5 tornadoes
30%
Ten or more severe wind reports
80%
One or more gusts of 65 knots or more
60%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
20%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Oct 21, 12:12 AM CDTSevere Thunderstorm WarningLZKClark, Montgomery, Pike, Polk48 min
Oct 21, 12:46 AM CDTSevere Thunderstorm WarningLZKClark, Garland, Hot Spring, Montgomery, Perry, Pike and 2 more44 min
Oct 21, 1:11 AM CDTSevere Thunderstorm WarningLZKConway, Faulkner, Garland, Grant, Hot Spring, Perry and 2 more49 min
Oct 21, 1:14 AM CDTSevere Thunderstorm WarningLZKBoone, Johnson, Logan, Marion, Newton, Searcy46 min
Oct 21, 1:30 AM CDTSevere Thunderstorm WarningLZKClark, Garland, Grant, Hot Spring, Montgomery, Pike and 1 more30 min
Oct 21, 1:47 AM CDTSevere Thunderstorm WarningLZKBaxter, Boone, Johnson, Marion, Newton, Pope and 1 more25 min
Oct 21, 1:50 AM CDTSevere Thunderstorm WarningLZKCleburne, Conway, Faulkner, Lonoke, Perry, Pulaski and 1 more40 min
Oct 21, 1:59 AM CDTSevere Thunderstorm WarningLZKGrant, Hot Spring, Saline31 min
Oct 21, 2:04 AM CDTSevere Thunderstorm WarningLZKLogan, Montgomery, Polk, Scott, Yell41 min
Oct 21, 2:31 AM CDTSevere Thunderstorm WarningLZKConway, Garland, Logan, Montgomery, Perry, Pope and 2 more44 min
Oct 21, 2:37 AM CDTSevere Thunderstorm WarningLZKGrant, Jefferson, Lonoke, Pulaski, Saline38 min
Oct 21, 2:41 AM CDTSevere Thunderstorm WarningLZKClark, Garland, Hot Spring, Montgomery, Pike49 min
Oct 21, 2:47 AM CDTSevere Thunderstorm WarningLZKLonoke, Prairie, Pulaski, White28 min
Oct 21, 3:04 AM CDTSevere Thunderstorm WarningLZKJackson, Jefferson, Lonoke, Prairie, Pulaski, White and 1 more41 min
Oct 21, 3:08 AM CDTSevere Thunderstorm WarningLZKClark, Garland, Hot Spring, Montgomery, Pike, Saline52 min
Oct 21, 3:27 AM CDTSevere Thunderstorm WarningLZKJackson, Lonoke, Monroe, Prairie, White, Woodruff33 min
Oct 21, 3:45 AM CDTSevere Thunderstorm WarningLZKFaulkner, Lonoke, Pulaski, Saline, White45 min
Oct 21, 4:14 AM CDTSevere Thunderstorm WarningLZKLonoke, Prairie, Pulaski, Saline, White, Woodruff46 min
Oct 21, 4:31 AM CDTSevere Thunderstorm WarningLZKGrant, Jefferson44 min
Oct 21, 4:41 AM CDTTornado WarningLZKJefferson20 min
Oct 21, 4:45 AM CDTSevere Thunderstorm WarningLZKLonoke, Monroe, Prairie, White, Woodruff60 min
Oct 21, 4:54 AM CDTSevere Thunderstorm WarningLZKBradley, Calhoun, Cleveland, Dallas, Ouachita51 min
Oct 21, 5:06 AM CDTSevere Thunderstorm WarningLZKArkansas, Cleveland, Grant, Jefferson, Lincoln, Lonoke and 2 more39 min
Oct 21, 5:19 AM CDTSevere Thunderstorm WarningLZKArkansas, Bradley, Calhoun, Cleveland, Desha, Drew and 1 more41 min
Oct 21, 5:43 AM CDTSevere Thunderstorm WarningLZKArkansas, Desha, Jefferson, Lincoln, Monroe66 min
Oct 21, 5:55 AM CDTSevere Thunderstorm WarningLZKArkansas, Bradley, Calhoun, Cleveland, Desha, Drew and 1 more70 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

Springfield, MO (KSGF), launched 00:00Z, 4.8 hours before the alert went out and 212 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, Springfield, MO at 00:00Z on 2019-10-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 183 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, Springfield, MO at 00:00Z on 2019-10-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 270 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
183 J/kg
Mixed-layer CIN
-126 J/kg
Mixed-layer LCL
1000 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
270 m²/s²
0-3 km storm-relative helicity
251 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.8

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 20, 7:01 PM CDTTornado WatchSPCColumbia, Hempstead, Howard, Lafayette, Little River, Miller and 2 more7 hr
Oct 20, 8:27 PM CDTTornado WatchSPCBenton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more5 hr
Oct 20, 10:19 PM CDTMesoscale DiscussionSPCBenton, Washington86 min
Oct 20, 11:32 PM CDTMesoscale DiscussionSPCBaxter, Clark, Cleburne, Cleveland, Conway, Dallas and 27 more88 min
Oct 21, 1:50 AM CDTTornado WatchSPCColumbia, Hempstead, Howard, Lafayette, Little River, Miller and 3 more5 hr
Oct 21, 3:06 AM CDTTornado WatchSPCClay, Craighead, Crittenden, Cross, Greene, Lee and 4 more6 hr
Oct 21, 4:57 AM CDTMesoscale DiscussionSPCAshley, Bradley, Chicot, Desha, Drew63 min
Oct 21, 5:30 AM CDTSevere Thunderstorm WatchSPCAshley, Chicot4 hr

Nearby

Tornado Watches in Arkansas, 2019Every tornado watch in 2019

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.