Tornado Watch 99

Issued

Apr 21, 2004, 2:40 PM CDT (19:40 UTC)

Expired

Apr 21, 2004, 9:00 PM CDT

In force

6 hr

Issued by

the Storm Prediction Center

The Little Rock radar (KLZK), 42 km from the middle of the area, began a volume at 19:43 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.

• Mesoscale Discussion 410Apr 21, 2:13 PM CDT
• Mesoscale Discussion 414Apr 21, 4:40 PM CDT
• Mesoscale Discussion 418Apr 21, 6:29 PM CDT
• Mesoscale Discussion 422Apr 21, 8:12 PM CDT

678 
WWUS20 KWNS 211936
SEL9  
SPC WW 211940
ARZ000-OKZ000-220200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 99
NWS STORM PREDICTION CENTER NORMAN OK
240 PM CDT WED APR 21 2004

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

       MUCH OF ARKANSAS
       EXTREME SOUTHEAST OKLAHOMA

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 240 PM UNTIL
900 PM CDT.

TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 85 STATUTE MILES EAST AND WEST
OF A LINE FROM 15 MILES NORTH NORTHEAST OF HARRISON ARKANSAS TO 15
MILES SOUTH SOUTHEAST OF EL DORADO ARKANSAS.

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 98...

DISCUSSION...AIRMASS OVER MUCH OF AR CONTINUES TO DESTABILIZE WITH
SBCAPE VALUES OF 1500-2500 J/KG.  WEAK CAP AND FORCING ALONG SEVERAL
REMNANT BOUNDARIES WILL LIKELY RESULT IN SCATTERED STRONG/SEVERE
THUNDERSTORMS IN THE NEXT FEW HOURS.  SUPERCELLS ARE LIKELY...WITH
THE THREAT OF ISOLATED TORNADOES IN STRONGER CELLS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.
MEAN STORM MOTION VECTOR 27030.


...HART

362,0913 330,0911 330,0941 362,0943

Tornado Watches in Arkansas, 2004Every tornado watch in 2004

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.