Hi Brian. Can’t get 11 MPH wind gusts in the log files or to Wunderground. Here’s what I see is happening. A wind gust registers 10.5 on my Oregon Scientific 968 station. It registers 10.5 in the extremes and so far so good. But it goes to log files as 10 MPH and also to WU as 10 MPH. When a 10.9 MPH gust is reached it registers in extemes correctly but goes to log files as 12 MPH and also to WU as 12. 10.9 is also displayed on graph as 11.5. I believe we both have the same issue as I looked though many pages of your data on WU for a 11 MPH wind gust and can’t find any. I’ve been using WD for a couple months now and never once had 11 MPH gust in my log files and should have had many. If there’s a way to make 10.9 register on the graph as 11.4 or 11.3 instead of 11.5, I think that would solve the issue.
Looking at my csv file, it looks like wind values may be ‘rounding’, i.e 10.7 mph reporting as 11mph, 11.4 as 11mph etc. Is this due mto something not set ? The txt log seems to record correct values.
Whatever is up I think it is also affecting 19 MPH as well. Don’t usually have those wind speeds here except briefly in storms so it’s hard for me to tell but think it’s also MIA. Billy
WD stores all its data as metric, and knots for windpspeed
for displaying mph, it converts to mph from knots
but the problem is the data file is only storing the windspeed in knots rounded…so there is no decimal place, and its actualy rounded down…
now, i originaly had it rounded becuase to save file size…it was originaly desgined for a laptop and only a 3.5 inch floppy drive…
that was the very first version of WD, a dos program, way back in 1986
that relic is still there today…the windspeed being rounded in the datafile…
the problem is i cant change it…if i did, it then makes all the old datafiles (graph history, etc), not able to be accessed…
but , i thought, 1 knot or 1 mph difference is neither here nor there when you take into account the accuracy of the anenometer, siting problems (i.e often the speed is too low or too high), etc, etc
so you are saying you dont get windspeed as high as 19mph much?
man…were I live, we dont get days where it doesnt reach that speed very often , LOL
Yes, wind speeds are alot slower down here in Florida compared to where you live. I saw your wind speeds on WU and gasped lol. A max wind of of the day of 15 mph is not uncommon around here, especially in the summer. I do live in an area with alot of tall trees and do have some wind slowage, but not much cause after remounting my anemometer 7 times because of the trees, I decided to use one of them. So now my anemomoeter is mounted about 45 feet high up in a tall pine tree. Mounted by my local tree trimming company lol. So no, I’m not looking for 100 percent accuracy lol, but wasn’t expecting not to be able to get a 11 mph gust to Weather Underground. I upload data every 5 minutes and it sometimes becomes apparent that 11 mph is missing. I’m trying to understand what you said about rounding down. If 10.5 mph rounds to 10 mph, why does 10.9 round to 12 mph? Yes, 12 mph, every time. That part I don’t get. That’s why I can’t get 11. Anyway, regardles of whether that can be fixed or not, I still will keep using this cool program. I’ll also show you a few pics of my crazy anemometer mount up in the tree. And my wind readings to go with it on WU below that.
Weather Display records the wind speed in knots, not mph. When mph is being displayed, WD converts the knots to mph. It looks like the mph is rounded to the nearest whole number, not always down.
9 knots = 10.35 mph = 10 mph when rounded.
10 knots = 11.5 mph = 12 mph when rounded.
16 knots = 18.4 mph = 18 mph when rounded.
17 knots = 19.55 mph = 20 mph when rounded.
i think that explains it murray, thanks for that
I like knots myself, mainly becuase i live near the ocean.
But here in NZ, they use knots of marine forecast, but kmh for land forecast…and kmh is 1.85 times knots…but sometimes the media get them confused, and talk about kmh when they should have said knots…
i.e they report on how strong the wind is, quote say 85kmh, when they should have said 85 knots (157kmh)
There is some places in NZ (i.e the hills above WEllington),where the average speed is as high as 25 knots!!!
The strongest winds recorded there was around 140knots!
(back in the early 60’s)
oh and thats one crazy anenmometer!
good on your though!
but doesnt parts of florida get hit my hurricanes sometimes?
Thanks Murry. Would never have figured that out. I should have came here first instead of driving myself crazy for 3 weeks trying to figure out what was up, lol. I’m not familiar with knot conversions at all. Strictly have always used MPH. But like Brian, I do now live near the coast, ( Gulf of Mexico) since I moved from New York to Florida 3 years ago and many weather warnings that apply to me now, are Special Marine Warnings in which knots are always used. So, guess it’s never too late to start learning them. Martyn, I’ve read some of your posts before and have had your weather page in my favorites for a few weeks now. Love that screen shot. Nice colors. That tree I’m using is a very sturdy tree. It doesn’t bend like the other types of pines. I should have no problems with it unless a big bird called an Egret chews through the anemometer sensor wire again. But think my tree guy solved that problem by locating it in a different spot after having to take it back down to repair the wire. If you all only knew what I’ve been through with that anemometer lol. Brian, the least of my worries is a hurricane which usually one effects Florida every 3 or 4 years. I’m am in such a flood prone and vulnerable area that I won’t be around here to see one. I am in a first to evacuate flood zone. I’ve only experienced 1 tropical storm since I moved here and stayed here for it. Wasn’t so bad but this area is long overdue for a major hit. Put it this way. If a storm similar to Hurricane Andrew, which hit the SE coast and had around a 17 foot storm surge, were to hit here on the shallow west coast of Florida near the Tampa Bay area, the surge could be double the height of what occured. Here’s a picture of a flagpole with storm surge indicators on it, located 2 blocks away from where I live. I am actually 2 blocks closer to the coast than this street sign. Thanks everyone.
