Tornado Watch 139

Issued

Apr 15, 2011, 2:19 AM CDT (07:19 UTC)

Expired

Apr 15, 2011, 10:00 AM CDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.5 in

Strongest gust expected

60 kt

The Little Rock radar (KLZK), 87 km from the middle of the area, began a volume at 07:19 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

40%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

80%

One or more gusts of 65 knots or more

20%

Ten or more severe hail reports

40%

One or more hailstones of 2 inches or more

5%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 432Apr 14, 11:11 PM CDT
• Mesoscale Discussion 433Apr 14, 11:56 PM CDT
• Mesoscale Discussion 434Apr 15, 1:27 AM CDT
• Mesoscale Discussion 435Apr 15, 4:21 AM CDT

211 
WWUS20 KWNS 150723
SEL9
SPC WW 150723
ARZ000-LAZ000-MOZ000-MSZ000-TNZ000-TXZ000-151500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 139
NWS STORM PREDICTION CENTER NORMAN OK
220 AM CDT FRI APR 15 2011

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

       EASTERN AND SOUTHERN ARKANSAS
       NORTHERN LOUISIANA
       THE MISSOURI BOOTHEEL
       WESTERN AND NORTHERN MISSISSIPPI
       WEST TENNESSEE
       NORTHEAST TEXAS

EFFECTIVE THIS FRIDAY MORNING FROM 220 AM UNTIL 1000 AM CDT.

TORNADOES...HAIL TO 1.5 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 105 STATUTE
MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH NORTHWEST OF
DYERSBURG TENNESSEE TO 15 MILES SOUTH SOUTHEAST OF NATCHITOCHES
LOUISIANA.  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...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 136...SEVERE THUNDERSTORM WATCH NUMBER 138. WATCH
NUMBER 136 138 WILL NOT BE IN EFFECT AFTER 220 AM CDT.

DISCUSSION...AR/NW LA/NE TX QLCS WITH EMBEDDED SUPERCELLS/LEWPS
EXPECTED TO CONTINUE GENERALLY EWD AT 40 KTS THROUGH MID
MORNING...WITH SOME DECELERATION/BREAK-UP POSSIBLE TOWARD/AFTER
SUNRISE.  AHEAD OF THE SQLN...MORE ISOLD...SLIGHTLY ELEVATED STORMS
MAY CONTINUE TO FORM IN WAA ZONE OVER NRN MS/NEAR/W TN.  OTHER ISOLD
STORMS...PERHAPS SFC-BASED...MAY FORM IN MOISTENING 50+ KT CONFLUENT
LOW-LVL FLOW OVER CNTRL MS.  STRENGTH OF LOW-LVL AND DEEP
SHEAR...DEGREE OF FORCING FOR ASCENT...AND PRESENCE OF EXISTING
SUSTAINED STORMS SUGGEST CONTINUED LIKELIHOOD FOR SVR SFC
WINDS...ISOLD TORNADOES...AND POSSIBLY SVR HAIL.

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 26040.


...CORFIDI

Tornado Watches in Arkansas, 2011Tornado Watches in Mississippi, 2011Tornado Watches in Louisiana, 2011Every tornado watch in 2011

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.