Tornado Watch 247

Issued

May 2, 2008, 1:09 AM CDT (06:09 UTC)

Expired

May 2, 2008, 7:52 AM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Tulsa radar (KINX), 57 km from the middle of the area, began a volume at 06:09 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

30%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

60%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

60%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 765May 1, 10:04 PM CDT
• Mesoscale Discussion 766May 1, 11:29 PM CDT
• Mesoscale Discussion 768May 2, 4:22 AM CDT

000
WWUS20 KWNS 020608
SEL7  
SPC WW 020608
ARZ000-OKZ000-021300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 247
NWS STORM PREDICTION CENTER NORMAN OK
110 AM CDT FRI MAY 2 2008

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

       NORTHWEST ARKANSAS
       CENTRAL AND EASTERN OKLAHOMA

EFFECTIVE THIS FRIDAY MORNING FROM 110 AM UNTIL 800 AM CDT.

TORNADOES...HAIL TO 2 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 90 STATUTE
MILES EAST AND WEST OF A LINE FROM 25 MILES NORTH NORTHWEST OF
GROVE OKLAHOMA TO 30 MILES SOUTHEAST OF ARDMORE OKLAHOMA.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU7).

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 246...

DISCUSSION...A STRONGLY FORCED SQUALL LINE WILL DEVELOP EWD FROM
CENTRAL INTO ERN OK AS A COLD FRONT SURGES EWD IN THE WAKE OF A
SURFACE LOW DEVELOPING NEWD INTO SE KS.  STRONG INSTABILITY IS STILL
PRESENT IN THE WARM SECTOR WITH VERY STEEP MID LEVEL LAPSE
RATES...THOUGH CONVECTIVE INHIBITION IS ALSO LARGE FOR BOUNDARY
LAYER PARCELS.  GIVEN THE VERY STRONG LOW-LEVEL SHEAR AND MOIST
BOUNDARY LAYER...THERE WILL STILL BE SOME POTENTIAL FOR ISOLATED
SPIN-UPS WITHIN THE LINE.  OTHERWISE...DAMAGING WINDS AND LARGE HAIL
SHOULD BE THE MOST COMMON THREATS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 27035.


...THOMPSON

Tornado Watches in Oklahoma, 2008Tornado Watches in Arkansas, 2008Every tornado watch in 2008

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.