Monitoring and Predictions of Rip Currents on So California Beaches Drs. C-S Wu and and Stephan B. Smith NOAA National Weather Service Office of Science and Technology Meteorological Development Laboratory Thanks to: Jason Taylor, Mike Churma, and John Schattel (MDL) David Soroka (OCWWS), Noel Isla, Michael Khuat, Tina Stall and Ivory Small (SGX), David
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Monitoring and Predictions of Rip Currents on So California Beaches
Monitoring and Predictions of Rip Currents on So California Beaches. Drs. C-S Wu and Stephan B. Smith NOAA National Weather Service Office of Science and Technology Meteorological Development Laboratory. Thanks to: Jason Taylor, Mike Churma, and John Schattel (MDL) - PowerPoint PPT Presentation
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Monitoring and Predictions of Rip Currents on So California Beaches
Drs. C-S Wu and and Stephan B. Smith
NOAA National Weather Service
Office of Science and Technology
Meteorological Development Laboratory
Thanks to: Jason Taylor, Mike Churma, and John Schattel (MDL)David Soroka (OCWWS), Noel Isla, Michael Khuat, Tina Stall and Ivory Small (SGX), David Danielson (LOX)
Beach hazards: Rip Currents Trends in the States
Courtesy Miami Herald
James B Lushine
230
113
440
18
43
13
13
0
0
0209
19
01
6
56
3
1
0
38
91
0 34
0
0
GuamGuamGu
Guam
34 Samoa
3
PR/VI10
Rip Current Deaths by State1999-2008
Rip Current Deaths by State 1995-2008
– a jet-like seaward flow across the surf zone Xb of a beach.
_ a transient eddy
_ local vortex motions
Rip currents on beaches:
“ “ Monitor rip currents so as to reduce the hazard Monitor rip currents so as to reduce the hazard to the public….” on 2004 Rip Current Workshopto the public….” on 2004 Rip Current Workshop
Observations of rip currents on beaches, HOW ?
Un-manned radars? In-sit measurements ?
Trained Spotters, Lifeguards.
Background
Rip Currents on west coasts
From U S Lifesaving Beach Safety Manual (Brewster,1995):
Fixed: appear over a rip channel.
Permanent: Behind or near a jetty
Flash: wave sets, bi-modal waves, transient.
Traveling or migrating: High waves strike the beach at large angle for a long duration.
Number of Rips: _____Single, _____Multiple (2-4), ______Wide stack (5+) Rip location relative to Street names: E---+---D---+---C---+---B---+---A Street