

000 

WWUS20 KWNS 091922

SEL8

SPC WW 091922

COZ000-KSZ000-NEZ000-100300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 288

NWS STORM PREDICTION CENTER NORMAN OK

120 PM MDT FRI MAY 9 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHEAST COLORADO

       NORTHWEST KANSAS

       SOUTHWEST NEBRASKA



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 120 PM UNTIL 900

PM MDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70

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

NORTHEAST OF AKRON COLORADO TO 45 MILES SOUTH SOUTHEAST OF

GOODLAND KANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



OTHER WATCH INFORMATION...CONTINUE...WW 287...



DISCUSSION...STORM INITIATION SHOULD ENSUE AS UPPER TROUGH SPREADS

EAST THROUGH LATE AFTERNOON AND DEEP-LAYER ASCENT STRENGTHENS ACROSS

THE HIGH PLAINS. INCREASING LOW LEVEL SELY FLOW WAS TRANSPORTING

MID-UPR 40S DEWPOINTS NWWD BENEATH STEEPENING LAPSE RATES. IN

COMBINATION WITH DIURNAL HEATING...A NARROW CORRIDOR OF SBCAPE

AROUND 500 J PER KG HAS ALREADY FORMED. THIS INSTABILITY SHOULD BE

SUFFICIENT FOR A FEW STOUT/ORGANIZED UPDRAFTS WITH HAIL AND STRONG

WINDS GIVEN EFFECTIVE BULK SHEAR OF 30-40KT.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400. MEAN STORM

MOTION VECTOR 29025.





...CARBIN

