With myMAP, you can fit the maps to your own particular needs by modifying some of the variables and using the zoom on the map. For each map you create, you can save it using the function "download" below it. The location selected corresponds to the black circle displayed on the map. The coordinate axes of the map show the coordinates of the selected place and the surrounding. If the myMAP does not show, choose a location 1-10 kilometres away from the selected place. This error may occasionally happen on domain boundaries. We appreciate, if you report the location to meteoblue.
The different maps that you can have on myMAP are introduced below.
The myMAP wind shows the movement of the wind in the different altitudes for the chosen place.
The colours indicate the wind speeds, and are shown in the legend. The wind speeds are given in km/h by default, but you can choose to have it in m/s or knots above the map.
The map's legend has detail steps from 0-90 km/h. Above 90 km/h, no more details are shown, because these speeds rarely occur, and when they do, they often occur over an entire area (and not unevenly distributed). Also, their temporal and altitudinal distribution is more important than their spatial distribution. For speeds above 90 km/h, the meteogram air will provide more useful details about wind speed. Only the large scale distribution is shown in the maps.
You can choose the height for which you want to create a map and for what time (UTC) within the possibilities above the map.
The map represents a section of 1x1 degrees, and thus includes about 100 kilometers in latitude and longitude, and you can zoom in or out for more details or a larger area. To provide world-wide availability, it uses a simplified set of maps, on which only the country's borders, main water bodies and rivers are displayed. If you want to view a larger area, you can simply create two adjacent wind maps.
The myMAP convective updrafts map shows the speed of the air mass (thermals) going upwards (in m/s). The colour legend ranges between 0 and 6 m/s. When the speed is high, this is a sign for a thunderstorm.
The convective updrafts shows the local thermal activity, which can be measured in the form of vertical wind currents. It represents the average of locally updraft currents (also called "thermals") for the area of the grid cell. It does not show the potential maximal updrafts, nor vertical geostrophic winds, nor is it valid for the entire area of the grid cell. Thermals updrafts are usually "air hoses" (thermals) in which warm air rises quickly to higher altitudes, leading to reduction in the temperature layering of the atmosphere and to circulation by adjacent sinking of colder air. Convection does therefore not occur over the entire area. The exact location of convective updrafts depends on many factors, such as temperature differences between soil and air layers, intensity of solar radiation, surface slope and cover, moisture of the soil and vegation, dominant winds, and others. It is therefore not possible to calculate and display an exact display of thermals on a map: the calculation would often false because the actual activity depends on the detailed topography as well as the current vegetation, land cover and insolation. Those factors (except topography) are very difficult to measure exactly, and also change during the season.
Despite these limitations, convective updraft maps show very detailed differences especially in ondulated terrain: slopes exposed to the sun, higher mountains, and "hot spots" produce clearly more updrafts then slopes turned away from the sun, flat land, "cold spots" (such as water bodies, especially in the summer). They can be very useful to paragliders, gliding and balloon pilots for flight planning.
The myMAP wind also shows some updrafts in hilly terrain: when updrafts occur along mountain ridges, the wind stream lines of the surface level will show convergence along these ridges, because the air will flow towards these ridges and rise there, virtually "disappearing" into higher levels.
The lifted index (LI) is an indicator for thunderstorm development by giving an indication on the air stability. 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 smaller than -6 till bigger than 6. The higher the index the more stable the air and the more the buoyancy is negative; the lower the index the less stable the air and the more the buoyancy is positive. A LI of 0 represents a neutral atmosphere. A low LI combined with a higher value of relative humidity (RH) indicates that the troposphere is near 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.
The colours of the myMAP temperature represent the temperature, while the white lines correspond to the atmospheric pressure. The temperature is shown in °C by default, but you can change it into °F above the map.
The legend goes from -32° to +48°C. Extreme temperatures are not included because they usually are in non-populated places and in areas with very small temperature gradients.