BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH OUTLINE UPDATE FOR WS 593
NWS STORM PREDICTION CENTER NORMAN OK - 505 PM CDT MON AUG 13 2007
SEVERE THUNDERSTORM WATCH 593 IS IN EFFECT UNTIL 1000 PM CDT FOR THE FOLLOWING LOCATIONS - NE - NEBRASKA COUNTIES INCLUDED ARE ARTHUR - BLAINE - BOYD - BROWN - CHERRY - CUSTER - GRANT - HOLT - HOOKER - KEYA PAHA - LOGAN - LOUP - MCPHERSON - ROCK - THOMAS
SD - SOUTH DAKOTA COUNTIES INCLUDED ARE AURORA - BON HOMME - BRULE - CHARLES MIX - DOUGLAS - GREGORY
HAIL TO 2 INCHES IN DIAMETER- THUNDERSTORM WIND GUSTS TO 70 MPH- AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
DISCUSSION- LINE OF INTENSE THUNDERSTORMS HAS FORMED ALONG AXIS OF STRONG HEATING AND WEAKENING CAP OVER CENTRAL NEB/SOUTHERN SD. THESE STORMS ARE EXPECTED TO PERSIST FOR SEVERAL HOURS THIS EVENING WITH A RISK OF DAMAGING WINDS AND HAIL.
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 600. MEAN STORM MOTION VECTOR 30025.
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