Severe Thunderstorm Watch 288

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