Tornado Watch 708

Issued

Oct 17, 2007, 7:43 AM CDT (12:43 UTC)

Expired

Oct 17, 2007, 2:26 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.5 in

Strongest gust expected

60 kt

The Norman radar (KTLX), 94 km from the middle of the area, began a volume at 12:45 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

30%

One or more gusts of 65 knots or more

10%

Ten or more severe hail reports

40%

One or more hailstones of 2 inches or more

10%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 2087Oct 17, 4:07 AM CDT
• Mesoscale Discussion 2088Oct 17, 4:41 AM CDT
• Mesoscale Discussion 2089Oct 17, 6:07 AM CDT
• Mesoscale Discussion 2092Oct 17, 10:24 AM CDT
• Mesoscale Discussion 2094Oct 17, 1:20 PM CDT

000
WWUS20 KWNS 171249
SEL8  
SPC WW 171249
OKZ000-TXZ000-172100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 708
NWS STORM PREDICTION CENTER NORMAN OK
745 AM CDT WED OCT 17 2007

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

       SOUTHWEST THROUGH CENTRAL AND NORTHEAST OKLAHOMA
       WESTERN NORTH TEXAS

EFFECTIVE THIS WEDNESDAY MORNING AND AFTERNOON FROM 745 AM UNTIL
400 PM 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 65 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 55 MILES SOUTHWEST OF ALTUS
OKLAHOMA TO 10 MILES SOUTHEAST OF TULSA OKLAHOMA.  FOR A COMPLETE
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
(WOUS64 KWNS WOU8).

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 706...WW 707...

DISCUSSION...SLIGHTLY ELEVATED TSTMS/SUPERCELLS FORMING IN AREA OF
ASCENT AHEAD OF STRONG NM SHORTWAVE TROUGH EXPECTED TO PERSIST AND
POSSIBLY STRENGTHEN AS LOW LVL MOISTURE INFLOW CONTINUES ACROSS
REGION.  WHILE SFC HEATING WILL BE LIMITED...COMBINATION OF WEAK MID
LVL COOLING...LOW LVL MOISTENING AND INCREASING LARGE SCALE ASCENT
MAY ALLOW STORMS TO BECOME INCREASINGLY SFC-BASED.  STRENGTH OF LOW
LVL DIRECTIONAL SHEAR /EFFECTIVE SRH TO 300 MR PER S2/ AND LOW LCLS
SUGGEST POTENTIAL FOR TORNADOES IF STORMS DO INDEED STRENGTHEN AND
BECOME SFC-BASED.

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
450. MEAN STORM MOTION VECTOR 23040.


...CORFIDI

Tornado Watches in Oklahoma, 2007Tornado Watches in Texas, 2007Every tornado watch in 2007

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.