Monday, November 7, 2011

WATCHES: Tornado Watch Number 870

WWUS20 KWNS 071913
SEL0
SPC WW 071913
OKZ000-TXZ000-080300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 870
NWS STORM PREDICTION CENTER NORMAN OK
110 PM CST MON NOV 7 2011

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

WEST CENTRAL AND SOUTHWEST OKLAHOMA
NORTHWEST TEXAS

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 110 PM UNTIL 900
PM CST.

TORNADOES...HAIL TO 2.5 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 60 STATUTE
MILES EAST AND WEST OF A LINE FROM 45 MILES NORTH NORTHEAST OF
CLINTON OKLAHOMA TO 75 MILES SOUTH SOUTHEAST OF CHILDRESS TEXAS.
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...CUMULUS STREETS HAVE GRADUALLY BEEN DEEPENING THIS AFTN
AS WEAK ASCENT...TIED TO A LEAD MID-LVL SHORTWAVE TROUGH...EJECTS
ENE ACROSS THE WARM SECTOR. AIR MASS HAS BECOME MODERATELY UNSTABLE
AS PLENTIFUL LLVL MOISTURE STREAMS NWD BENEATH STEEP MID-LVL LAPSE
RATES. NATURE OF ASCENT /WEAK-MODEST/ AND DEEP-LAYER SHEAR VECTORS
LARGELY NORMAL TO INITIATING BOUNDARIES WILL CONTRIBUTE TO BOTH
LINEAR AND DISCRETE CELLS WITH POTENTIAL FOR VERY LARGE HAIL. LLVL
SHEAR...WHILE SOMEWHAT MODEST AT MID-AFTN...WILL INCREASE AS PRIMARY
UPR TROUGH OVER THE SRN HIGH PLAINS APPROACHES THE REGION AND LLVL
INCREASE RISK FOR TORNADOES LATE THIS AFTN AND EARLY EVENING.

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 24035.


...RACY

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
To unsubscribe from WX-STORM send e-mail to LISTSERV@LISTSERV.ILLINOIS.EDU with
"unsub wx-storm" in the body of your message. For more information write cnovy@cox.net.

No comments: