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time outdoors and scoping out san diego s best ice cream spots when a hurricane approaches the coast most people think of wind rain and storm surge impacts however rip currents which can occur even if a storm passes well off the coast are often forgotten beach hazards imagine you re heading to the beach on a summer day there s not a cloud in the sky and a fair weather day is forecast for your local area once you arrive you see red flags flying indicating that hazardous conditions like strong rip currents and dangerous surf are present it turns out that a hurricane several hundred miles off the coast is to blame for these unsafe ocean conditions even though it is not expected to directly impact land near you you may be wondering is it safe to go in the ocean why are we so worried about rip currents image credit noaa oceans today unbeknownst to many beachgoers rip currents are found at almost any beach with breaking waves after a wave breaks the water rushing towards the shore in the surf zone or the area between the beach and the breaking waves must flow back out to the sea forming a rip current these strong narrow water channels flowing away from shore account for approximately 80 of all surf zone rescues in the united states they also account for the majority of surf zone fatalities dangerous rip currents can form due to the wave energy from a distant weather system such as a tropical storm or hurricane in 2019 8 people lost their lives in rip currents along the u s east coast from hurricane lorenzo even though that hurricane passed about 2000 miles east of there wave period forecast for hurricane lorenzo 2019 valid from september 28 through september 30 demonstrating the wave energy from the hurricane making it to the coast even though the storm was thousands of miles away lets talk about what to do after you arrive at the beach to stay safe rip current awareness and safety know your options what to do if you re caught in a dangerous rip current it can be challenging to tell if you re stuck in a rip current the first sign might be that you re not making progress swimming toward shore and you re getting worn out if it s a strong rip current you might feel it pulling you away from the beach as soon as you realize you re in danger take action to keep yourself safe additionally rip currents can be dangerous even in waist deep water a wave can knock a swimmer off their feet and due to the speed of the current it can quickly pull them away from shore if you find yourself stuck in a rip current 1 the most important thing to do is to remain calm and not panic swimming against the current will only make you tired and increase your danger 2 remember to float rip currents do not pull you underwater they pull you away from the shore and into deeper water 3 if you can swim out of the current parallel to the shore use the breaking waves to help push you in if you can t escape float or tread water and yell or wave for help image and gif credit ocean today rip current survival guide video https oceantoday noaa gov ripcurrentfeature be beach smart here are some other key ocean swimming safety tips from the united states lifesaving association usla that people who go to the beach should be very familiar with to remain safe swim near a lifeguard and look for the warning flags indicating the risk of rip currents the chance of drowning at a beach protected by lifeguards affiliated with usla is 1 in 18 million know how to swim do not go into the ocean if you don t know how to swim swimming in the ocean is not the same as swimming in a pool never swim alone and never take your attention away from your family or friends at the beach if you are not a strong swimmer bring something that floats the only safe flotation device is a u s coast guard approved life jacket that is the proper size for you when in doubt don t go out it s always better to swim another day when conditions are safer if you re going to the beach always check the rip current forecast first just as you would check for rain that day never assume the ocean is safe even on a nice day if you forgot to check the forecast talk to a lifeguard before getting into the ocean and do not ignore any warning flags another reminder always swim near a lifeguard image credit ocean today https oceantoday noaa gov ripcurrent welcome html the science behind rip currents how waves form to understand how rip currents form it s important to learn how breaking waves develop one way waves develop in open water is due to winds associated with distant weather systems waves are created by the friction between wind and surface water as wind blows across the ocean s surface the continual disturbance creates a wave crest wind speed wind duration and the distance over water the wind blows in a single direction known as fetch all play a significant role in wave growth for big waves to form strong winds need to blow for a long period of time from a consistent direction over a large distance waves travel across the open ocean as a form of energy as the wave energy travels into shallower water and interacts with the ocean bottom the wave breaks if a wave is bigger or has more energy associated with it it will interact with the bottom of the ocean sooner which can create a larger breaking wave image credit national ocean service https oceanservice noaa gov education tutorial_currents media supp_cur03a html hurricanes can generate waves that travel hundreds or even thousands of miles generally the larger stronger and slower moving a storm is the bigger the waves it produces when these large waves reach the coastline they bring the potential for dangerous rip currents how rip currents form rip currents are powerful streams of water that flow from the nearshore where swimmers enter the water out towards the open ocean they form when a large amount of water rushes towards shore from breaking waves the excess water seeks the path of least resistance back to the sea by converging and forming a rip current they can develop anywhere but are often found between breaks in sandbars and reefs or along structures such as jetties and piers image credit nws rip currents learn how to spot one green dye many people find themselves in trouble because they swim where the waves aren t breaking however rip currents often flow between breaking waves making the water look seemingly calm they are difficult to spot from the shoreline and can appear unexpectedly frequently catching swimmers off guard the anatomy of a rip current rip currents consist of three primary parts the feeder the neck and the head the feeder currents feed the excess water in the nearshore to the neck of the rip current where the current is strongest and where people usually find themselves in trouble the water disperses in the head of the current typically beyond the breaking waves the characteristics of the ocean bottom in the surf zone the area between the breaking waves and the shoreline will determine rip current potential image courtesy of comet meted rip currents nearshore fundamentals 2020 edition rip current behavior rip currents can be categorized by the mechanism in the surf zone that allows them to develop there are three main categories of rip currents boundary or structurally controlled bathymetric and hydrodynamic how each type of rip current forms and how easy they are to predict will be described below boundary rip currents can form along man made structures such as groins jetties and piers as well as natural features like headlands and rock or reef outcrops rip currents along structures can be especially dangerous because they can occur even during small breaking wave conditions since these currents are caused by permanent structures they tend to be long lasting and stationary making them easier to predict image credit dr tom herrington stevens institute of technology bathymetric rip currents form due to the bathymetry or shape of the ocean floor both semi permanent bathymetric features such as breaks in sandbars and fixed features like offshore submarine canyons submarine ridges and reefs may create rip currents that fluctuate in intensity depending on weather surf and tide conditions these rip currents are relatively stable and consistent in their location but their occurrence is more challenging to predict due to their tendency to pulse on and off additionally the location of sandbars can move due to breaking waves which can shift the location of the rip current image credit google earth via comet meted rip currents nearshore fundamentals 2020 edition hydrodynamic rip currents are controlled by the interactions between waves and currents because they do not need a fixed feature to form the locations where they develop vary and their duration can last from seconds to minutes they are the most difficult to predict and can have different visual cues understanding the conditions that lead to the formation of these rip currents can help determine their likelihood of occurrence image credit r brander from rehoboth beach delaware how to spot a rip current rip currents are easiest to identify from an elevated position such as a lifeguard stand or tower and can be challenging to spot when standing at the water s edge here are some clues to help you identify rip currents look for an area of lighter seemingly calmer water flanked by areas of breaking waves and whitewater a channel of churning choppy water that is distinctive from the surrounding water a difference in water color such as an area of yellow green or murky tint moving water in a rip current can pick up sediment sand and marine organisms carrying them away from the beach a consistent area of foam or seaweed being carried through the surf a stream of water flowing away from the beach out through the surf zone keep in mind if you see breaking waves assume rip currents are present waves may break on top of a rip current making them very hard to see rip current speeds vary but can reach up to 8 feet per second 5 mph which is faster than the speed of an olympic swimmer photo by ethan gibney photo by greg crow courtesy of lifeguard captain nick steers county of los angeles fire department find the forecast for more information or to see if a distant hurricane could send hazardous surf and increased rip current activity to the beach you re visiting check out hurricanes gov where the national hurricane center will now be providing an interactive rip current risk viewer you can also find beach specific forecasts by visiting https www weather gov beach on this site you can click on the beach you re visiting to get the latest surf rip current and local weather forecasts additionally you can also find information by visiting your local nws office s website a coastal hazards message may be in effect if hazardous beach conditions are expected or ongoing look for headlines such as beach hazard statement rip current statement or high surf advisory warning in effect most of the time an increase in surf will result in an increase in rip current activity share this print opens in new window print email a link to a friend opens in new window email tweet like loading this entry was posted in marine nhc outreach and tagged beach hurricane lifeguard ocean rip current surf surf zone swell travel waves nhc cone heads in a new direction posted on august 12 2024 robbie berg warning coordination meteorologist daniel brown branch chief hurricane specialist unit larry kelly hurricane specialist you may have seen our announcement back in february that we at the national hurricane center would start producing an experimental version of the cone of uncertainty in mid august that depicts coastal and inland tropical storm and hurricane watches and warnings for the continental united states well that time has come and even though we don t currently have a tropical cyclone threatening the continental united states we want to refresh everyone on some of the things you ll notice about the new cone and some of the things that you should be aware of when using it particularly since this will be the biggest change made to the nhc cone graphic since 2017 but first a comment about the new cone being experimental in national weather service nws vocabulary experimental means that a potential new product or service is being tested by the nws and partners and users are encouraged to provide feedback during a comment period this also means that the product may at times be a little rough around the edges may not be available on a consistent basis and probably should not be used yet for critical support decisions after the comment period is over we go through your feedback to determine 1 should the product go operational 2 if it does go operational are there things in the product we need to modify or 3 do we need to create an updated version of the product and open up another comment period think of it like a pharmaceutical company testing a new drug it sometimes takes multiple rounds of testing before the drug is approved by the u s food and drug administration for human consumption if you want the nitty gritty on the public comment period refer to the nws public information statement or description page on the nhc website comments can be provided in the nws survey on the nhc experimental tropical cyclone forecast cone graphic one important note to keep in mind the current operational version of the cone will still be available and will not change during the experimental period what will be different about the experimental version of the cone of uncertainty vs the current operational version comparison of the current operational version of the nhc cone of uncertainty left and the experimental version that will be used in 2024 right for advisory 20 from hurricane ian in 2022 the current operational version of the cone graphic only shows tropical storm and hurricane watches and warnings in a line along portions of the coast that may be affected the experimental version will add a depiction of these watches and warnings for inland areas in the continental united states in addition to those in effect along the coast watches and warnings in effect for land areas will take visual precedence over the cone in the experimental version this is because tropical storm and hurricane watches and warnings actually convey the risk of strong winds from a tropical cyclone and should be the primary information used by decision makers to assess their wind risk before a storm the cone itself does not convey the risk of strong winds and only looking at that component of the graphic can be misleading the current cone graphic shows white transparent shading to depict the forecast track uncertainty for the first 3 days of the forecast and then white stippling for the 4 and 5 day portion of the forecast since there isn t really anything special between the early and latter parts of the forecast the experimental version will instead use white transparent shadi...
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