Tornado Watch 491

Issued

Oct 4, 2016, 3:40 PM CDT (20:40 UTC)

Expired

Oct 4, 2016, 11:00 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

The Norman radar (KTLX), 44 km from the middle of the area, began a volume at 20:40 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

50%

One or more EF2 to EF5 tornadoes

30%

Ten or more severe wind reports

40%

One or more gusts of 65 knots or more

10%

Ten or more severe hail reports

70%

One or more hailstones of 2 inches or more

50%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 1754Oct 4, 2:51 PM CDT
• Mesoscale Discussion 1756Oct 4, 4:55 PM CDT
• Mesoscale Discussion 1759Oct 4, 7:17 PM CDT

726 
WWUS20 KWNS 042036
SEL1  
SPC WW 042036
OKZ000-050200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 491
NWS STORM PREDICTION CENTER NORMAN OK
340 PM CDT TUE OCT 4 2016

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  SOUTH CENTRAL OKLAHOMA

* EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 340 PM UNTIL
  900 PM CDT.

* PRIMARY THREATS INCLUDE...
  A FEW TORNADOES AND A COUPLE INTENSE TORNADOES POSSIBLE
  SCATTERED LARGE HAIL LIKELY WITH ISOLATED VERY LARGE HAIL EVENTS
    TO 2.5 INCHES IN DIAMETER POSSIBLE
  SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

SUMMARY...THUNDERSTORMS ARE LIKELY TO FORM THIS AFTERNOON OVER
SOUTHWEST OK AND TRACK NORTHEASTWARD ACROSS THE WATCH AREA. 
CONDITIONS APPEAR FAVORABLE FOR ISOLATED SUPERCELL STORMS CAPABLE OF
VERY LARGE HAIL AND DAMAGING WINDS.  A FEW TORNADOES ARE ALSO
POSSIBLE.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE
MILES EAST AND WEST OF A LINE FROM 30 MILES WEST NORTHWEST OF
CHANDLER OKLAHOMA TO 45 MILES WEST SOUTHWEST OF ARDMORE OKLAHOMA.
 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU1).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 490...

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
500. MEAN STORM MOTION VECTOR 25035.


...HART

Tornado Watches in Oklahoma, 2016Every tornado watch in 2016

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.