Frequently asked questions.

Wind speed increases with height above the ground. The instrument uses modelled levels at 10, 80, 120 and 180 metres and interpolates between them on a logarithmic height scale. A crane jib at 45 metres and a hub at 100 metres therefore receive different values from the same forecast. Outside 10 to 180 metres the value is extrapolated and labelled.

Wind speed generally rises with height. The instrument reads the model levels at 10, 80, 120 and 180 m and interpolates between them. Inside 10 to 180 m the value is native or interpolated; outside that range it is extrapolated and labelled as such.

Wind speed rises with height above the ground. The instrument reads the modelled levels at 10, 80, 120 and 180 m and interpolates between them on a logarithmic height scale, so a jib at 45 m and a hub at 100 m get different numbers from the same forecast. Outside 10 to 180 m the value is extrapolated and labelled. Gust is not scaled this way: the gust shown is always the 10 m gust.

There is one Limit box and one value at a time. You choose the working height with the Height stepper, and the limit is compared with the wind at that height. If your document gives different limits at different heights, change the limit when you change the height. Set your working height explains how height is handled.

No. If you try, the form answers An account already exists for this email. and you should use the Sign in tab. Each account is tied to one email address.

No. There are eight fixed presets. You can start from any of them and change the height, limit and unit freely, and the instrument remembers your last values on that device, but there is no way to save a named custom preset.

Because wind speed generally rises with height above the ground, and the instrument reads the model levels at 10, 80, 120 and 180 m and works out your height from them. Values inside 10 to 180 m are native or interpolated, and outside that range they are extrapolated and labelled as such.

This is the wording the Working height block uses when your selected Height lies between the fixed model heights of 10, 80, 120 and 180 metres. The instrument estimates the speed using the logarithm of height, which fits the way wind speed rises with height better than a simple average. It is an estimate between two model outputs, not a model output in itself.

No. It is a raw fraction of members, with no calibration against past outcomes, and the page says so. Ensembles are often too narrow, so a low figure does not rule an exceedance out. Use it as one input beside the primary forecast, the observation and your own judgement.

That check holds on its rule. For example Obs age is filled when the nearest report is 30 minutes old or less, and Lead time is filled up to 24 hours ahead.

AGREE means the spread score for the selected hour is 60 or more, so the three models are close in speed and direction at 10 m. SPLIT means it is below 60 and they are further apart. Neither one says anything about whether you are over your limit.

The primary line is a single best-match forecast at your height. The median is the middle of the pooled ensemble members at the ensemble level. They answer different questions, and when they diverge it is a sign of forecast uncertainty about that hour.

The second line of the observation shows the station height above ground, such as 10 m AGL for an airport report. That is the height of the instrument, not your working height. The model figure printed beside it is always the 10 m level, so the pair is a like-for-like comparison at the surface.

For 365 days from when it was frozen. After that the link shows that the record does not exist or has expired. Forgetting a record from your Records list does not delete it, and anyone with the link can still open it until it expires.

It is a ten-character code, using the letters a to z and the digits 2 to 7, that forms the end of the record's address. Pasting a whole link or only the id into the Records page works equally well.

365 days from the day they were frozen, regardless of plan. After that the address shows "No record at this address." and nothing can bring it back. Download the packet from the record page if you need to keep the contents longer.

Every 30 minutes. The scan reads the forecast for each saved site that has a rule with email switched on, and sends an email only for a window that has not been alerted before.

Alerts read the 10 m model level and your rule's metric. The instrument and fleet board show the value at your working height, which can be lower or higher. The alert email states that its values are modelled at 10 m.

For each site: the lamp, the wind now at the site height, the worst hour of the rest of today against your rule, the peak chance of crossing it, the best window, whether the models agree or split, and a check against the nearest weather station. Probabilities are uncalibrated member fractions.

WATCH means the odds reach 40% or the primary forecast is within 5 mph of your limit. STOP means the primary forecast reaches the limit or the odds reach 70%. Both deserve a look, and STOP means the limit is forecast to be reached or very likely to be.

Every 10 minutes while the page is open in a visitor's browser, plus once when it loads. The upstream forecast itself changes more slowly, so you will often see the same numbers twice.

No. It has no stability class and no plume model, and the word drift anywhere in your question gets the fixed refusal. It can give mean wind, gust and direction at a height for each hour.

A saved rule drives your alerts and your fleet lamps, so the agent only proposes it. You see the exact label, metric, limit and height on the card, and nothing is written until you press Confirm. That way a misheard number cannot quietly become your limit.

It means that one number in the answer did not match anything the agent fetched this turn, your packet on screen, your question or your remembered facts. The number may still be right, but the agent could not show where it came from. Do not use it, and check the instrument.

The Starter plan pays for your saved sites and your evidence records, so one person can keep decisions on file without a long purchasing process. The forecast and uncertainty you see are the same as on the free instrument, so the price buys the saved material, not better data.

Starter 3, Pro 25, Ops 100 and Enterprise 500, with more on request. Manage them in the Saved sites section of /account, where the heading shows how many you use, such as 2/3. The Add site button is disabled at your limit. Upgrading raises the limit straight away once the payment is confirmed.

Usually seconds, once the payment provider sends its confirmation to our server. The page does not refresh itself, so reload /account after a few minutes to see it. If more than an hour passes with a taken payment and no change, contact us with your payment details.

It identifies your account to the wind and decision endpoints so that your calls are counted against your plan's daily cap. It is not a password for the website and cannot sign in.

Odds UNKNOWN appears on the phone view of the Fleet board when a site has no usable odds: the ensemble did not load, or there were too few members in the hours checked. Without enough members the board cannot count the chance of crossing the limit, so it reports the gap rather than an unreliable number. In the instrument the same gap appears as a dash after P(>limit), with a reason underneath.

The chip reads SPLIT when the agreement score of the three deterministic models (ECMWF IFS, GFS and ICON) is under 60 out of 100 for that hour, or AGREE at 60 or above. It also shows how many models contributed, such as 2/3. When you see SPLIT, look at the exceedance fan and the observation line before you rely on a single forecast number.