WATCHES: Severe Thunderstorm Watch Number 472

WWUS20 KWNS 060755
SEL2
SPC WW 060755
NEZ000-SDZ000-061500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 472
NWS STORM PREDICTION CENTER NORMAN OK
250 AM CDT TUE AUG 6 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHERN NEBRASKA
SOUTHERN SOUTH DAKOTA

* EFFECTIVE THIS TUESDAY MORNING FROM 250 AM UNTIL 1000 AM CDT.

* PRIMARY THREATS INCLUDE...
SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
A FEW LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 50
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 115 MILES WEST
NORTHWEST OF VALENTINE NEBRASKA TO 20 MILES EAST OF ONEILL
NEBRASKA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 471...

DISCUSSION...SLIGHTLY ELEVATED TSTM CLUSTER HAS STRENGTHENED IN THE
PAST HALF HOUR OVER SW SD...SW OF PHP. ADDITIONAL STORMS ALSO HAVE
STRENGTHENED ALONG AXIS OF ENHANCED LOW-LVL WAA FARTHER SE NEAR THE
SD-NEB BORDER N OF ANW. RAPID CITY VWP HAS SHOWN AN INCREASE IN DEEP
WNW FLOW OVER THE PAST 90 MINUTES...WITH THE 3 KM WIND SPEED NOW 50
KTS. THIS INCREASE MAY BE RELATED TO THE ESE PROGRESSION OF UPR
IMPULSE NOW OVER ERN MT. CONTINUED ESE MOTION OF THE
DISTURBANCE...THE PRESENCE OF EML PLUME DOWNSTREAM ACROSS THE NRN
PLNS...AND MOIST/SSWLY LWR TROPOSPHERIC FLOW OVER NEB TOGETHER
SUGGEST A POTENTIAL FOR CONTINUED STORM INTENSIFICATION...AND THE
POSSIBILITY FOR BOWING SEGMENTS WITH DMGG WIND/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 500. MEAN STORM
MOTION VECTOR 30030.


...CORFIDI

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