SEL2
SPC WW 090009
IAZ000-NEZ000-090700-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 592
NWS STORM PREDICTION CENTER NORMAN OK
705 PM CDT SUN AUG 8 2010
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
WESTERN...CENTRAL...AND NORTHERN IOWA
EASTERN NEBRASKA
EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 705 PM UNTIL
200 AM CDT.
HAIL TO 1.5 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 60
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES NORTH OF
GRAND ISLAND NEBRASKA TO 65 MILES SOUTHEAST OF MASON CITY IOWA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU2).
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 587...WW 588...WW
589...WW 590...WW 591...
DISCUSSION...COMPLEX MCS HAS EVOLVED OVER NE NEB THIS EVE. AREA
WIND AND THERMODYNAMIC FIELDS SUGGEST THAT NORTHERN PART OF SYSTEM
SHOULD TRACK MAINLY ESE ACROSS IA TOWARD I-35...WHILE WRN/SRN PART
OF MCS TURNS MORE TO THE RIGHT AND TRACKS SE INVOF THE MO RVR VLY AS
LLJ VEERS AND STRENGTHENS LATER THIS EVE. DEEP SHEAR IS
MODEST...AND UPR LVL FORCING FOR ASCENT APPEARS NEGLIGIBLE. BUT
COMBINATION OF STRONG INSTABILITY/RICH MOISTURE AND STEEP LOW LVL
LAPSE RATES SUGGEST A CONTINUED RISK FOR DMGG WIND AND POSSIBLY SVR
HAIL.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 29025.
...CORFIDI
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