Tornado Watch 89

Issued

Apr 10, 2013, 1:20 PM CDT (18:20 UTC)

Expired

Apr 10, 2013, 11:00 PM CDT

In force

10 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

The Little Rock radar (KLZK), 35 km from the middle of the area, began a volume at 18:22 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.

Two or more tornadoes

80%

One or more EF2 to EF5 tornadoes

50%

Ten or more severe wind reports

60%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

80%

One or more hailstones of 2 inches or more

60%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 427Apr 10, 1:03 PM CDT
• Mesoscale Discussion 429Apr 10, 3:01 PM CDT
• Mesoscale Discussion 432Apr 10, 6:09 PM CDT
• Mesoscale Discussion 434Apr 10, 7:55 PM CDT
• Mesoscale Discussion 436Apr 10, 9:14 PM CDT

072 
WWUS20 KWNS 101824
SEL9  
SPC WW 101824
ARZ000-MOZ000-110200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 89
NWS STORM PREDICTION CENTER NORMAN OK
120 PM CDT WED APR 10 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF 

       CENTRAL AND EASTERN ARKANSAS
       THE SOUTHERN MISSOURI BOOTHEEL

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 120 PM UNTIL
900 PM CDT.

TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE
MILES EAST AND WEST OF A LINE FROM 30 MILES NORTH NORTHWEST OF
WALNUT RIDGE ARKANSAS TO 15 MILES SOUTH OF EL DORADO ARKANSAS. 
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU9).

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 88...

DISCUSSION...SURFACE HEATING/DESTABILIZATION CONTINUES ACROSS AR
EARLY THIS AFTERNOON...AND THE CAP IS WEAKENING PER 18Z LZK/SHV
SOUNDINGS.  CONVECTION IS BEGINNING TO DEVELOP ALONG THE SLOW-MOVING
COLD FRONT IN SW AR...AND ADDITIONAL STORMS WILL LIKELY FORM NWD
ALONG THE FRONT...AND POTENTIALLY IN THE OPEN WARM SECTOR.  MLCAPE
IS ALREADY AOA 2000 J/KG WITH A MOIST BOUNDARY LAYER...AND BOTH
DEEP-LAYER AND LOW-LEVEL SHEAR ARE EXPECTED TO INCREASE LATER THIS
AFTERNOON/EVENING.  THE INITIAL CONVECTION WILL POSE A RISK FOR
LARGE HAIL/DAMAGING WINDS...WHILE THE TORNADO RISK WILL INCREASE
LATER THIS AFTERNOON IN RESPONSE TO THE STRENGTHENING VERTICAL SHEAR
AND MORE FAVORABLE HODOGRAPH STRUCTURES.  ASSUMING A COUPLE OF
SEMI-DISCRETE STORMS CAN PERSIST...ESPECIALLY OFF THE COLD
FRONT...AN ISOLATED STRONG TORNADO WILL BE POSSIBLE.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 23040.


...THOMPSON

Tornado Watches in Arkansas, 2013Tornado Watches in Missouri, 2013Every tornado watch in 2013

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.