![]() That is the length of the longest lightning ever measured. The thunder is caused by the sudden expansion of the air in the immediate surroundings of the lightning – it can reach temperatures of up to 30,000 degrees Celsius and is only a few centimeters thick! This discharge can occur both by a lightning strike to the ground or to another cloud. The friction of the water molecules in the cloud creates a high electrical voltage, which is balanced by the discharge of a lightning bolt. The driving engines for a thunderstorm are high solar radiation, water evaporation, and the resulting formation of a cloud (more on cloud formation here). This allows you to locate lightning “live” and in “real-time” yourself. Due to the different arrival times (in the range of milliseconds) of the electromagnetic wave, precise conclusions can be drawn about the impact location and the strength of the lightning. This wave arrives at different radar stations at the speed of light. The measuring technique of the lightning radar makes the decisive contribution here: Each lightning/lightning strike emits an electromagnetic wave that propagates over hundreds of kilometers. The great advantage of our lightning strike map is that thunderstorms and lightning are displayed with a very short delay. Here is what you need to know about thunderstorms and the lightning radar! This way you can see exactly how the thunderstorm has developed over the last hours and minutes and infer where the thunderstorm will move on to. To display the temporal course and direction of the lightning front, simply click on the cursor symbol. Each of these flashes signals a single lightning strike. On the lightning map, you can also see small flashes of lightning, which are indicated by a short, white flash. Blue or green color indicates a relatively weak thunderstorm or weak precipitation.Ĭaution is advised in case of yellow, orange, red, and especially purple coloring:Ī lightning front of this type involves a clear risk of severe weather. The strength of the thunderstorm is measured with the help of precipitation as also with our storm radar. The lightning map shows you current thunderstorms in color. Tracking the current lightning front – How to read the lightning map: Depending on the strength, the precipitation is displayed in blue (weak precipitation), green, yellow, orange (moderate precipitation), red, or purple (very heavy precipitation). You can click the below button to read all from the source.Thunderstorms and lightning strikes are indicated by a lightning symbol. Since hail can cause the rainfall estimates to be higher than what is actually occurring, steps are taken to prevent these high dBZ values from being converted to rainfall.Ĭited/Cached from. Hail is a good reflector of energy and will return very high dBZ values. These values are estimates of the rainfall per hour, updated each volume scan, with rainfall accumulated over time. Depending on the type of weather occurring and the area of the U.S., forecasters use a set of rainrates which are associated to the dBZ values. The higher the dBZ, the stronger the rainrate. Typically, light rain is occurring when the dBZ value reaches 20. The scale of dBZ values is also related to the intensity of rainfall. The value of the dBZ depends upon the mode the radar is in at the time the image was created. Notice the color on each scale remains the same in both operational modes, only the values change. The other scale (near left) represents dBZ values when the radar is in precipitation mode (dBZ values from 5 to 75). One scale (far left) represents dBZ values when the radar is in clear air mode (dBZ values from -28 to +28). Each reflectivity image you see includes one of two color scales. The dBZ values increase as the strength of the signal returned to the radar increases. So, a more convenient number for calculations and comparison, a decibel (or logarithmic) scale (dBZ), is used. Reflectivity (designated by the letter Z) covers a wide range of signals (from very weak to very strong). "Reflectivity" is the amount of transmitted power returned to the radar receiver. The colors are the different echo intensities (reflectivity) measured in dBZ (decibels of Z) during each elevation scan. ![]()
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