Windy Community

    • Register
    • Login
    • Search
    • Unread
    • Categories
    • Groups
    • Go to windy.com

    Why is Wind speed in hurricanes so wrong?

    Frequently Asked Questions
    53
    75
    155650
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • D
      DailyRich @oldman77 last edited by

      So if I see a wind speed of 180 / 35mph, what does that mean exactly? What's that first number?

      Toobie78 M 2 Replies Last reply Reply Quote 0
      • jurate2911
        jurate2911 | Premium last edited by

        I really like this tool and hope the team can develop to be as accurate as possible. Wishing this team all the best. This tool is my secondary. I have built a map by putting all traditional sources together. with both of these tools, we can monitor and compare the data easier.
        http://www.arcgis.com/apps/View/index.html?appid=7eaab00a59954a03b952e44e0150844a

        1 Reply Last reply Reply Quote 1
        • georgewells
          georgewells last edited by

          News agencies across the World are reporting Irma's wind speeds up to 185MPH. How is it that they all know the wind speeds but Windy.com and the Windy app do not?

          I have yet to see Windy show Irma's wind speeds any greater than 80MPH. That makes the app useless. How can any of Windy's numbers be trusted with such grievous errors?

          F R A 3 Replies Last reply Reply Quote 1
          • Toobie78
            Toobie78 @DailyRich last edited by

            The first number is the compass heading. 0 means the wind is out of the north (blowing to the south), 90 is east, 180 is south, & 270 is out of the west.

            1 Reply Last reply Reply Quote 1
            • M
              markholbrook64 @DailyRich last edited by

              @DailyRich First number is wind direction. 0=north, 180=south etc.

              1 Reply Last reply Reply Quote 1
              • kf4nxs
                kf4nxs last edited by

                You have to remember, depending on the model you are using those are the values at Height. IE 10mAGL is apx 33 ft above Ground Level, some model are at 9k feet and some higher. 10m is about as close to ground level as you can get with model software, and there is all kinds of factors at ground level that can change the wind values. Homes, trees, vehicles, even porches can effect an accurate wind speed at ground level.

                1 Reply Last reply Reply Quote 0
                • M
                  MeteoMike686 @Siff last edited by

                  @Siff Where do you get the real data from for everywhere on the planet? It's easy to say you have real data in somewhere like the USA, which is covered by hundreds of observation points, along with upper air measurements taken twice daily. What about everywhere else?

                  How do you verify a forecast for a location which there is no credible observation data? Remote sensing can help, but it only goes so far.

                  1 Reply Last reply Reply Quote 1
                  • stevecrye
                    stevecrye @TZ | Premium last edited by

                    @TZ 100% correct TZ. Others in this thread clearly don't understand weather modeling. Windy pulls the model data - NAM 3k, ECMWF 9k or GFS 22k - from NOAA and other agencies and then displays it on a great GUI - all 100% free. Windy does not generate model data. Prior to Windy I was forced to look at the raw data - ugh. I'm hoping soon that Windy can also show other "popular" models such as HRRR, OP4-, BAK40, etc. Also, a skew-t at a click would be wonderful! Keep up the good work. Windy is an invaluable tool for pilots and sailors, who use it every day. As for the haters - take the time to learn how to use Windy - for example, I just now selected Wind Gusts and see 155 MPH near the eye of Irma - very accurate. And study meteorology , it might help you get a clue ... if all that fails, go use some other app/website, most are not free.

                    Steve

                    Gkikas LGPZ 1 Reply Last reply Reply Quote 12
                    • Gkikas LGPZ
                      Gkikas LGPZ Moderator @stevecrye last edited by

                      @stevecrye
                      You are absolutely right!
                      Windy is the best "tool" for visualization of weather models and the only one that provides, for free, data from the ECMWF. Unfortunately some people cannot distinguish model data (forecasted values) from real measurments (observations). And some others even expect to have forecast radar images !!! ignoring that radar "can see" only what happens now ... forecast models "visualize" the future (with all the inaccuracies that include).
                      P.S. sorry for my poor english

                      Gkikas LGPZ 1 Reply Last reply Reply Quote 4
                      • Gkikas LGPZ
                        Gkikas LGPZ Moderator @Gkikas LGPZ last edited by

                        If someone wants to compare actual wind measurements with model's outputs:
                        Here can find ocean wind measurements from scatterometer (satellite instrument)
                        https://manati.star.nesdis.noaa.gov/datasets/ASCATBData.php

                        Ricky_Lightning 1 Reply Last reply Reply Quote 1
                        • F
                          frostymon @Siff last edited by

                          @Siff , it is mentioned in the about section. It says the site uses three weather models. i don't see why you feel they need to spell out the things they do not use.

                          1 Reply Last reply Reply Quote 2
                          • F
                            frostymon @georgewells last edited by

                            @georgewells , news agencies are most likely getting their data from the National Hurricane Center, who are in turn getting their wind speed data by flying an airplane into the storm. This website relies on a few standard models to present it's graphics, not actual observations.

                            J 1 Reply Last reply Reply Quote 3
                            • N
                              nolan0019 last edited by

                              Siff mentioned that he had been comparing weather station data to Windy's reported surface winds and they agreed. I too have been doing this following Irma (I live in Orlando). I went to weather channel or other local weather data for a location and compared it to Windy and they did seem to be very close (for wind speed). Weather stations measure the actual wind speed from instruments that are 10m off the ground (http://www.wral.com/weather/blogpost/1283652/). I would assume that the reported hurricane wind speeds are measured the same way, but I agree that there’s a big disparity between the reported speed and Windy’s speed. Another very similar site, www.ventusky.com, has the same disparity.

                              1 Reply Last reply Reply Quote 0
                              • W
                                wingnut46 last edited by

                                I don't care about the politics for sure. I also think this is a great graphic to indicate what's happening and going to happen. Whether there is some error in the system of 20 or 40 %, it's a great way to show laymen some technical information that isn't a bunch of stuff that only engineers, meteorologists, or geniuses can comprehend. GREAT JOB

                                1 Reply Last reply Reply Quote 1
                                • AnemoiVenti
                                  AnemoiVenti last edited by

                                  Windy needs to get the Winds right... kind of a poetic necessity. :)

                                  I agree with many that that the wind data sets (wind & wind gusts) are are not easy to nail at all - let alone consistently. But I truly believe it needs to be mastered over time... especially in the angry weather world we have brought ourselves.

                                  I think Ventusky is making a good effort here (though not sure on data accuracy audits re wind).

                                  When Cat5 Matthew rolled thru Florida last year - the wind data projections were wildly off the further out from the storm centers.. useless actually.

                                  When I looked that the micro-local Dark Sky wind speed projections... they were spot on.

                                  I think that (in the end) there needs to be a artful balance between macro and micro data. That said: when you are in a storm - most want to know what is going to happen to me where I am... and those we love.

                                  Master the winds... Windy!

                                  Stay safe everyone....

                                  H 1 Reply Last reply Reply Quote 1
                                  • H
                                    howlster @AnemoiVenti last edited by

                                    Windy states very clearly that winds are arrived at using all relative, applicable and resourceful data and they are defined. The arrows represent wind velocity, (relative speed and direction), within a certain volume suspended above the surface. There may be a billion directions and speeds in that volume, but the one chosen represents the speed and direction expressing the central or typical value in a set of data, in particular the mode, median, or, (most commonly), the mean.****

                                    IMO windy is a great tool-very discerning engineering.

                                    1 Reply Last reply Reply Quote 1
                                    • Mike Boyle
                                      Mike Boyle last edited by

                                      Steve, this is great and I thank you (I live in Florida)
                                      A better work around is take the measurement at 100 meters or 500 meters.
                                      This is a compromise of sorts.
                                      This is a worthwhile project and may save many lives here.
                                      I am reposting on Facebook with some editing. all the tool bars and are can be distracting. I wish you could do false colour white green and blue.

                                      THank you.

                                      Mike Boyle 1 Reply Last reply Reply Quote 0
                                      • Mike Boyle
                                        Mike Boyle @Mike Boyle last edited by

                                        @Mike-Boyle
                                        If you need any help in evaluation let me know.
                                        I'm a retired electronic/ computer technician.
                                        Boylemike1@aol.com

                                        1 Reply Last reply Reply Quote 0
                                        • ralphthemagician
                                          ralphthemagician @Siff last edited by

                                          @Siff I get what you're saying, but you can't really compare this to the general media. Modern entertainment journalism just makes stuff up. They don't care. Their information comes from the aether. They just want you to keep watching through the commercials to the next segment. They'd say the winds are made of explosive gas and are gusting at Mach 2.5 if it was believable.

                                          1 Reply Last reply Reply Quote 1
                                          • A
                                            allison last edited by

                                            Please at least post a notice of wind info not being related to actual real time experience. I used this to track storm as my daughter and crewof S/Y Ocean Star are stranded in Tortola. I was am so confused and it absolutely added to all the stress!!! Did not know what info to trust.
                                            Finally realized the tracking portion is the only real time data that is helpful . All that other effort to post data is USELESS if it is not actual experience in real time.

                                            1 Reply Last reply Reply Quote 0
                                            • First post
                                              Last post
                                            Windyty, S.E. - all rights reserved. Powered by excellent NodeBB
                                            NodeBB & contributors, OSM & contributors, HERE maps
                                            Terms of Use     Privacy Policy