Sometimes the boundary will persist on radar for a time after the storm dissipates. Other times, it will only appear ahead of the storm in the direction it’s moving, or off to one side and trailing behind the storm along its path. Sometimes it will spread out evenly in all directions. The primary way to distinguish this type of boundary is that it occurs in proximity to a thunderstorm or cluster/line of storms, and moves away from the storm.
Thunderstorm Outflow Boundaries/Gust Fronts Outflow and gust fronts are probably the most commonly observed type of boundary that is illustrated by radar.Here are several different examples of boundaries. These boundaries are frequently favored areas for thunderstorms to initiate, which is one reason they are meteorologically significant even though the reflectivity is not a result of precipitation. My Allison House RadarScope app has been working for basic radar on three devices (Mac Laptop Pro, iPad, and iPhone) for months and showed that I was signed in.
Examination of velocity data will usually show convergence. They generally appear on radar as a long, thin line of reflectivity, rarely exceeding 30 dBZ. In general, these are regions of converging wind, and insects or other things that drift with the wind are also concentrated along the boundary. These are meteorological features, but the reflectivity we can see on radar is a result of stuff that is not precipitation (usually insects). The first category we will look at is atmospheric boundaries and circulations. Part 1: Atmospheric Boundaries/Circulations Many of these features will only be visible on RadarScope with Expert Mode turned on, as they have relatively low reflectivity values.
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Often, these have an unusual appearance to observers that are used to looking at precipitation, which causes people to ask “what is that?” This series of blog posts will describe several of the most common forms of non-precipitation echoes and how to use RadarScope and sometimes other meteorological data to determine the most likely explanation (usually not bats or aliens, despite the comments in the RadarScope users group on Facebook). However, sometimes radars detect things that are not precipitation (the fancy term for the source of these echoes is “non-hydrometeor scatterers” or “non-meteorological scatterers”). Usually, meteorologists and other weather observers use reflectivity to identify where precipitation is falling and how heavy it is.
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RadarScope: What Can You See on Radar Other Than Rain? Love Pro Tier 1 at 10/year but absolutely will not be paying 100/year for tier 2 although I would use some of the features.
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