Tornado Watch 74

Issued

Apr 13, 2014, 1:56 PM CDT (18:56 UTC)

Expired

Apr 13, 2014, 10:00 PM CDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

The Norman radar (KTLX), 32 km from the middle of the area, began a volume at 18:57 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

50%

One or more gusts of 65 knots or more

10%

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

80%

• Mesoscale Discussion 334Apr 13, 12:26 PM CDT
• Mesoscale Discussion 336Apr 13, 1:43 PM CDT
• Mesoscale Discussion 339Apr 13, 3:09 PM CDT
• Mesoscale Discussion 343Apr 13, 6:25 PM CDT
• Mesoscale Discussion 344Apr 13, 7:54 PM CDT

296 
WWUS20 KWNS 131857
SEL4  
SPC WW 131857
OKZ000-TXZ000-140100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 74
NWS STORM PREDICTION CENTER NORMAN OK
200 PM CDT SUN APR 13 2014

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  CENTRAL AND EASTERN OKLAHOMA
  NORTH TEXAS

* EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 200 PM UNTIL
  800 PM CDT.

* PRIMARY THREATS INCLUDE...
  A COUPLE 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

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE
MILES EAST AND WEST OF A LINE FROM 30 MILES NORTHWEST OF
BARTLESVILLE OKLAHOMA TO 60 MILES WEST SOUTHWEST OF SHERMAN
TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).

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 73...

DISCUSSION...THUNDERSTORMS ARE BEGINNING TO FORM ALONG THE COLD
FRONT IN NORTH CENTRAL OK...AND WILL SOON FORM ALONG THE DRYLINE
SOUTHWARD INTO NORTH TX.  STRONG INSTABILITY WILL PROMOTE SUPERCELL
STRUCTURES WITH DRYLINE STORMS...CAPABLE OF VERY LARGE HAIL AND
DAMAGING WINDS.  THE TORNADO THREAT APPEARS GREATEST LATE THIS
AFTERNOON AND EVENING OVER SOUTHEAST OK...WHERE STRONGEST LOW LEVEL
SHEAR AND BOUNDARY LAYER MOISTURE WILL BE PRESENT.

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 26030.


...HART

Tornado Watches in Oklahoma, 2014Tornado Watches in Texas, 2014Every tornado watch in 2014

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.