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627 

WWUS20 KWNS 112018

SEL8

SPC WW 112018

COZ000-120300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 298

NWS STORM PREDICTION CENTER NORMAN OK

215 PM MDT FRI JUN 11 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EASTERN COLORADO



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 215 PM UNTIL 900

PM MDT.



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 45 STATUTE

MILES EAST AND WEST OF A LINE FROM 60 MILES NORTH NORTHWEST OF

AKRON COLORADO TO 20 MILES SOUTH SOUTHEAST OF TRINIDAD COLORADO.

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.



DISCUSSION...MOIST UPSLOPE FLOW REGIME HAS BECOME ESTABLISHED ALONG

THE FRONT RANGE AND PALMER DIVIDE AREAS OF CO THIS AFTERNOON...TO

THE WEST OF QUASI-STATIONARY THERMAL/LEE LOW OVER WRN KS. LOWER

STATIC STABILITY ASSOCIATED WITH WEAK DPVA AND UPPER TROUGH TO THE

WEST WILL CONTINUE TO SUPPORT THUNDERSTORM DEVELOPMENT OVER THE

MOUNTAINS AS AIRMASS TO THE EAST OF THE FRONT RANGE CONTINUES TO

UNDERGO DIURNAL DESTABILIZATION. EXPECT STORMS TO BEGIN TO SPREAD

EAST AND OFF THE HIGHER TERRAIN AND TAP GREATER SURFACE-BASED

INSTABILITY ACROSS THE PLAINS NEXT SEVERAL HOURS. CLOUD-BEARING FLOW

WILL BE CHARACTERIZED BY STRONG DIRECTIONAL AND SPEED SHEAR.

SUFFICIENT SRH IN THE UPDRAFT LAYER WILL SUPPORT STORM PERSISTENCE

AND POTENTIALLY STRONG CELL ROTATION WITH LARGE HAIL LIKELY FROM

THIS ACTIVITY. TORNADO POTENTIAL WILL ALSO EXIST WITH SUPERCELLS

THAT ARE ABLE TO DEVELOP OR MOVE INTO AREAS WITH LOCALLY LOWER

LFCS/GREATER BOUNDARY LAYER MOISTURE...NEAR RESIDUAL FRONTAL/OUTFLOW

BOUNDARIES.



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

450. MEAN STORM MOTION VECTOR 23020.





...CARBIN

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