Alert archive / Arkansas / Tornado Watches in 2015

Tornado Watch 20

April 3, 201520 counties in Arkansas; 8 counties in Missouri

The Storm Prediction Center issued this tornado watch at Apr 3, 2015, 1:35 AM CDT for 20 counties in Arkansas; 8 counties in Missouri. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Apr 3, 2015, 1:35 AM CDT (06:35 UTC)
Expired
Apr 3, 2015, 7:18 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 28 counties

Baxter County, AR, Boone County, AR, Clay County, AR, Cleburne County, AR, Craighead County, AR, Fulton County, AR, Greene County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Lawrence County, AR, Marion County, AR, Mississippi County, AR, Newton County, AR, Poinsett County, AR, Randolph County, AR, Searcy County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR, Butler County, MO, Carter County, MO, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Ripley County, MO, Stoddard County, MO

The radar

The Little Rock radar (KLZK), 167 km from the middle of the area, began a volume at 06:37 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
20%
One or more hailstones of 2 inches or more
10%
Six or more combined severe hail and wind reports
60%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 3, 1:38 AM CDTSevere Thunderstorm WarningPAHCarter, Ripley40 min
Apr 3, 1:44 AM CDTSevere Thunderstorm WarningLZKBaxter, Boone, Marion46 min
Apr 3, 1:48 AM CDTSevere Thunderstorm WarningLZKBaxter, Fulton, Izard42 min
Apr 3, 2:22 AM CDTSevere Thunderstorm WarningLZKBaxter, Fulton, Izard19 min
Apr 3, 2:26 AM CDTSevere Thunderstorm WarningLZKIzard, Sharp49 min
Apr 3, 5:12 AM CDTSevere Thunderstorm WarningLZKBaxter, Marion48 min
Apr 3, 5:43 AM CDTSevere Thunderstorm WarningLZKBaxter, Fulton, Izard47 min
Apr 3, 5:58 AM CDTSevere Thunderstorm WarningPAHButler, Wayne21 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

Little Rock, AR (KBYH), launched 00:00Z, 6.6 hours before the alert went out and 213 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 00:00Z on 2015-04-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 00:00Z on 2015-04-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 137 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3351 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
137 m²/s²
0-3 km storm-relative helicity
302 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

160 
WWUS20 KWNS 030636
SEL0  
SPC WW 030636
ARZ000-MOZ000-031400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 20
NWS STORM PREDICTION CENTER NORMAN OK
135 AM CDT FRI APR 3 2015

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  NORTH-CENTRAL AND NORTHEASTERN ARKANSAS
  SOUTHEASTERN MISSOURI

* EFFECTIVE THIS FRIDAY MORNING FROM 135 AM UNTIL 900 AM CDT.

* PRIMARY THREATS INCLUDE...
  A FEW TORNADOES POSSIBLE
  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
  ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 90 STATUTE
MILES EAST AND WEST OF A LINE FROM 15 MILES WEST OF BATESVILLE
ARKANSAS TO 20 MILES NORTHEAST OF POPLAR BLUFF MISSOURI.  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 17...WW 18...WW 19...

DISCUSSION...MCS/QLCS WITH BOW/LEWP CIRCULATIONS AND EMBEDDED
SUPERCELLS WILL PROCEED ESEWD ACROSS OZARKS TO PORTIONS MS RIVER
VALLEY WITH POTENTIAL FOR DAMAGING GUSTS...SPORADIC HAIL AND A FEW
TORNADOES POSSIBLE.  SVR TSTM WW WILL BE REQUIRED FARTHER W FOR MCS
MOVING OUT OF KS.  REF SPC MESOSCALE DISCUSSION 195 FOR SHORT-TERM
METEOROLOGICAL INFO.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 29035.


...EDWARDS

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 2, 7:02 PM CDTTornado WatchSPCBaxter, Benton, Boone, Carroll, Fulton, Marion8 hr
Apr 2, 10:12 PM CDTMesoscale DiscussionSPCBenton, Boone, Carroll, Marion93 min
Apr 3, 1:16 AM CDTMesoscale DiscussionSPCBaxter, Benton, Boone, Carroll, Clay, Craighead and 13 more59 min
Apr 3, 1:52 AM CDTSevere Thunderstorm WatchSPCBenton, Carroll4 hr
Apr 3, 5:43 AM CDTMesoscale DiscussionSPCBaxter, Clay, Cleburne, Craighead, Fulton, Greene and 13 more2 hr
Apr 3, 12:14 PM CDTTornado WatchSPCMississippi8 hr
Apr 3, 3:57 PM CDTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 6 more93 min
Apr 3, 5:54 PM CDTMesoscale DiscussionSPCUnion2 hr
Apr 3, 5:55 PM CDTSevere Thunderstorm WatchSPCAshley, Chicot4 hr
Apr 2, 7:32 PM CDTMesoscale DiscussionSPCBoone, Breckinridge, Bullitt, Butler, Caldwell, Carroll and 27 more58 min
Apr 2, 10:41 PM CDTSevere Thunderstorm WatchSPCBallard, Carlisle, McCracken6 hr
Apr 3, 3:39 AM CDTMesoscale DiscussionSPCBallard, Carlisle, Livingston, McCracken66 min
Apr 3, 11:56 AM CDTMesoscale DiscussionSPCAdair, Allen, Ballard, Barren, Boyle, Breckinridge and 48 more94 min
Apr 3, 2:23 PM CDTMesoscale DiscussionSPCAdair, Allen, Anderson, Barren, Bath, Bell and 96 more97 min
Apr 3, 3:10 PM CDTTornado WatchSPCAdair, Anderson, Bath, Bell, Bourbon, Boyle and 53 more6 hr
Apr 3, 5:10 PM CDTMesoscale DiscussionSPCBoyd, Greenup95 min
Apr 3, 4:37 AM CDTMesoscale DiscussionSPCChristian, Dent, Douglas, Howell, Laclede, Oregon and 8 more83 min
Apr 3, 5:54 PM CDTMesoscale DiscussionSPCCannon, Cumberland, DeKalb, Fentress, Jackson, Morgan and 9 more66 min
Apr 3, 6:48 PM CDTSevere Thunderstorm WatchSPCFranklin, Lincoln, Moore4 hr

Nearby

Tornado Watches in Arkansas, 2015Tornado Watches in Missouri, 2015Every tornado watch in 2015

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.