myMAP allows you to choose particular weather variables, a forecast time, and an altitude, then zoom and pan to a desired section, and finally download the resulting map for further use. myMAP was created with mainly aviation in mind and is available for the variables wind, convective updraft, lifted index, temperature, and precipitation.
Our new Weather maps functionality now supersedes myMAP, which will soon be retired. The new weather maps combine all available maps with the functionality of myMAP, offering significant advantages also for aviation:
- A complete set of weather variables
- A large number of altitude levels
- Long forecast periods
- Choice of different weather forecast models
- Current location indicated by a blue cross
- More and improved functionality
- Fast zooming and panning with many zoom levels
- Add wind animation to other maps
- Add/remove lat/long grids
- Switch sea level pressure contours on or off
- Optimised for high screen resolution
- Optimised for use on mobile devices (easier navigation, better display)
- Screenshot button for quick download
- Share button for social media
Units can be changed at the top of the colour scale on the left. A click on the current unit label opens a drop-down list that shows alternative units to pick from.
There is a timeline at the bottom, and the time zone is automatically adjusted to the selected location. In the lower right corner there is the option to switch between different weather models. If the weather model is not manually selected, the most suitable model for the current variable and map section is automatically chosen. All functions can be used on smartphones, making optimal use of the screen and simplifying navigation within and between maps.
The wind maps show wind at different altitudes for the selected location. The wind animation dynamically shows the flow of air, indicating air temperature such that motion and colour together can indicate fronts. Classical wind maps show wind speed, direction and gusts with static arrows and map colours. Wind speed units can be changed by clicking on the unit label at the top of the colour bar on the left (see image to the right).
Different heights or altitudes for wind speed, direction, and wind animation can be chosen in the menu on the right.
The "Convective Updraft" map shows the average vertical speed of air moving upwards (in m/s) and thus indicates thermal activity. High convective updraft speed combined with humidity is an indication for potential thunderstorms. Convective updraft values represent an average of individual thermals for the area of a grid cell. They do neither reflect the potential maximal updrafts nor the vertical geostrophic winds.
The Lifted Index (LI) is an indicator for thunderstorm development by development by indicating the stability of the atmosphere. It describes the difference between the air temperature within a buoyant parcel of air and the observed temperature of the surrounding environment at a height of 500 mb (hPa).
The index ranges between -6 and 6 and is unitless. The higher the index the more stable the atmosphere and the more the buoyancy is negative; the lower the index the less stable the atmosphere and the more the buoyancy is positive. A neutral atmosphere has an LI of 0. A low LI in combination with a high relative humidity (RH) indicates that the troposphere is almost saturation and unstable. A "trigger mechanism", such as a front, will be able to produce boundary layer based thunderstorms and heavy rain in this high RH / low LI environment. The LI is not of much use in winter because the PBL (planetary boundary layer*) tends to be dry (low dewpoints) and cold (stable). However, in the warm season or in the warm sector of a mid-latitude cyclone it will be useful for forecasting.
A neutral or even stable LI does not exclude the possibility of precipitation: When dynamic forcing without thermodynamic forcing occurs or if there is isentropic lifting (when warm air is lifted above cold air such as in a warm front) the troposphere may still produce precipitations.
*the planetary boundary layer separates the lowest part of the troposphere (where the surface directly influences air flow) from the rest and is up to 2 km high depending on land form and the time of the day.
Temperature can be displayed in different heights as selected in the menu. The air temperature is displayed in °C by default, but you have the possibility to change the unit on the left side by clicking on the unit label at the top of the colour scale. To support a global colour scale for temperatures, extreme temperatures are not graphically differentiated because the areas where they occur are usually unpopulated, and the temperature gradients in these areas are often low.