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Tornado Watch 160 Note: The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended. Note: Click for Watch Status Reports. SEL0 URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 160 NWS STORM PREDICTION CENTER NORMAN OK 130 PM CDT FRI APR 13 2012 THE NWS STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF OKLAHOMA A SMALL PART OF NORTHWEST TEXAS EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 130 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 APPROXIMATELY ALONG AND 60 STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES WEST OF WICHITA FALLS TEXAS TO 20 MILES NORTH NORTHWEST OF PONCA CITY OKLAHOMA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0). 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. DISCUSSION...STORMS ARE BEGINNING TO DEVELOP OVER SWRN OK AS THE CAP HAS WEAKENED WITHIN A STRONGLY UNSTABLE ENVIRONMENT WITH MLCAPE OF 2000-2500 J/KG. ALTHOUGH DYNAMIC FORCING FOR LARGE SCALE ASCENT IS SUBTLE...NUMERICAL GUIDANCE INDICATES THAT STORMS WILL CONTINUE TO DEVELOP TOWARD NRN OK THIS AFTERNOON...WITH CONVECTIVE POTENTIAL ALSO INCREASING ALONG THE NWRN EDGE OF MOISTURE AS IT RETREATS NWWD LATER THIS AFTERNOON AND EVENING. DEEP LAYER SHEAR OF 40 KT IN THE LOWEST 6 KM WILL FAVOR FORMATION OF SUPERCELL STRUCTURES...WITH AN INITIAL THREAT FOR LARGE HAIL AND STRONG WIND GUSTS. WITH TIME...LOW LEVEL WINDS/SHEAR WILL STRENGTHEN WITH A SUBSEQUENT INCREASE IN TORNADO POTENTIAL LATER THIS AFTERNOON AND EVENING. 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 550. MEAN STORM MOTION VECTOR 23025.

MESOSCALE DISCUSSION 0507 NWS STORM PREDICTION CENTER NORMAN OK 1210 PM CDT FRI APR 13 2012 AREAS AFFECTED...NWRN TX THROUGH SWRN OK CONCERNING...SEVERE POTENTIAL...WATCH LIKELY VALID 131710Z - 131915Z STORMS ARE EXPECTED TO DEVELOP SOON FROM NWRN TX INTO SWRN OK. INITIAL PRIMARY THREAT WILL BE SUPERCELLS WITH LARGE HAIL DURING THE AFTERNOON WITH THREAT FOR ISOLATED TORNADOES INCREASING DURING THE EARLY EVENING. AREA IS BEING MONITORED FOR A WW. A PRE-FRONTAL BOUNDARY EXTENDS FROM ERN KS SWWD THROUGH WRN OK AND NWRN TX. MOIST AXIS WITH MID-UPPER 60S DEWPOINTS ARE IN PLACE IN WARM SECTOR BENEATH 7-7.5 C/KM MID LEVEL LAPSE RATES PROMOTING AN AXIS OF 2000-2500 J/KG MLCAPE. THE ATMOSPHERE SHOULD DESTABILIZE FURTHER AS LOW CLOUDS MIX OUT AND THE BOUNDARY LAYER WARMS. VISIBLE IMAGERY CONTINUES TO SHOW AN INCREASE IN CUMULUS DEVELOPMENT IN VICINITY OF THE CONVERGENCE BOUNDARY OVER NWRN TX INTO SWRN OK AS WELL AS A LITTLE FARTHER EAST INTO S-CNTRL OK WITHIN ZONE OF WEAK WARM ADVECTION. MORNING RAOB DATA FROM FWD AND OKC INDICATED A MODEST INVERSION AROUND 750 MB...AND LATEST OBJECTIVE ANALYSIS SHOW ONLY A WEAK CAP REMAINING. INDICATIONS ARE THAT THUNDERSTORMS MAY SOON DEVELOP IN THIS REGION. EFFECTIVE DEEP LAYER SHEAR AROUND 40 KT SUPPORTS SUPERCELLS. LOW LEVEL WINDS HAVE BEEN VEERING AND WEAKENING AS PRIMARY LLJ SHIFTS THROUGH THE MS VALLEY IN ASSOCIATION WITH SHORTWAVE TROUGH EJECTING NEWD THROUGH ERN SD. THIS MAY DELAY A MORE ROBUST TORNADO THREAT UNTIL EARLY EVENING WHEN THE LLJ WILL STRENGTHEN OVER THE SRN PLAINS.

ATM my chase target for Saturday is Medford Oklahoma. Daniel

SPC convective outlook for Saturday Good luck stay safe!

Storms popping up on radar now Goodland KS Radar

MESOSCALE DISCUSSION 0501 NWS STORM PREDICTION CENTER NORMAN OK 0502 PM CDT THU APR 12 2012 AREAS AFFECTED...EASTERN CO/SOUTHWEST NEB/WESTERN KS CONCERNING...TORNADO WATCH 157... VALID 122202Z - 122330Z THE SEVERE WEATHER THREAT FOR TORNADO WATCH 157 CONTINUES. TORNADO WATCH 157 CONTINUES UNTIL 02Z...WITH CONTINUED POTENTIAL FOR TORNADOES/LARGE HAIL THROUGH LATE AFTERNOON/EARLY EVENING. A SEVERE THREAT /MAINLY HAIL/ MAY DEVELOP NORTHWARD OUT OF WW 157...SUCH THAT A WATCH EXTENSION/NEW SEVERE TSTM WATCH COULD BE NEEDED. PRIMARY SHORT-TERM SEVERE THREAT WILL LIKELY REMAIN ACROSS THE NORTHEAST CO/SOUTHWEST NEB/NORTHWEST KS BORDER REGION THROUGH LATE AFTERNOON/EARLY EVENING. SATELLITE IMAGERY SUGGESTS THAT FORCING FOR ASCENT/UPPER JET EXIT REGION IS INFLUENCING THIS REGION...AND THIS CORRIDOR IS LOCATED NEAR/JUST NORTH OF A SURFACE TRIPLE POINT WITH A SURFACE LOW ACROSS EAST-CENTRAL/NORTHEAST CO AND A SOUTHWARD EXTENDING DRYLINE ACROSS THE HIGH PLAINS. SUPERCELLS CAPABLE OF LARGE HAIL AND A TORNADO THREAT WILL REMAIN POSSIBLE INTO EARLY EVENING WITHIN A HIGHLY SHEARED ENVIRONMENT...WITH A LARGE HAIL THREAT ALSO POSSIBLE WITH INCREASINGLY ELEVATED STORMS SPREADING NORTH OF THE SURFACE WARM FRONT ACROSS FAR SOUTHWEST NEB. FARTHER SOUTH...RECENT SATELLITE TRENDS ARE INDICATIVE OF DEEPENING CU FIELD NEAR THE DRYLINE ALONG CO/KS BORDER...WHICH COULD LEAD TO AN UPSWING OF DEEP CONVECTION OVER THE NEXT FEW HOURS...AT LEAST ON AN ISOLATED BASIS. GIVEN SUCH DEVELOPMENT...SUPERCELLS CAPABLE OF LARGE HAIL WILL BE POSSIBLE...AND A TORNADO THREAT WILL EXIST AS WELL ESPECIALLY GIVEN NEAR/POST-SUNSET POTENTIAL FOR A NOCTURNAL LOW LEVEL JET INCREASE AND ABATED BOUNDARY LAYER MIXING.

James Menzies live stream with Paul and Arron on chasertv http://content.wdtinc.com/popout/index.php?M=14613&C=20643&O=10432 Good luck today

Oh right Ya there was a lot of storms that day Cheers Danny

Tampa Radar

Tampa Radar

Do you think this could be a moderate risk for Texas on Sunday?

All the best for the new year!

Thanks for all the weather charts

Wow that cell as exploded any photos

Excellent Nathan! Great photos and video

HD Video http://www.youtube.com/watch?v=PtjHdz4KYVU

HD Video http://www.youtube.com/watch?v=Y7b5nbBh2JQ

HD Video http://www.youtube.com/watch?v=qGz7UclgjpE

http://www.youtube.com/watch?v=PtE1_cbL8sc

We are all set for the high risk today! we are atm going north on i35 to Perry Oklahoma. Then check the latest weather data. Danny

Hi, we are at Norman Oklahoma this is the latest radar!

Hi, anymore forecasts for tour 2

Think that may have been another tornado

Wow all these storms look like they are rotating

Wow dew points of 75F Which cells are going to produce a tornados