The radar (located in the lower left corner of the image) cannot see much detail directly behind the heavy pink echoes that denote the core of the hail region, creating a "shadow". The colors of the wind barbs are coded by how confident the radar was that it measured a correct value. VIL is useful for:A handy VIL interpretation guide is available from the The Echo Tops image shows the maximum height of precipitation echoes. As a result, the TDWRs are very prone to ground clutter from buildings, water towers, hills, etc. In some cases, the range folded velocity data will be in the form of curved arcs that extend radially towards the radar.Since the TDWRs are designed to alert airports of low-level wind shear problems, the radar beam is pointed very close to the ground and is very narrow. Whether it's preparedness for floods, earthquakes, hurricanes, or fires, the key to survival in disasters is planning. This increased sampling increases the radar's sensitivity and ability to detect smaller objects in the atmosphere than in precipitation mode. If there is no precipitation above the radar to bounce off, a "ND" (Non-Detection) value will be plotted in knots. There is the standard radar reflectivity image, available at each of three different tilt angles of the radar, plus Doppler velocity of the winds in precipitation areas.

This is why bow echoes are associated with damaging straight-line winds, especially at their center or "crest."

Information on the movement of objects either toward or away from the radar can be used to estimate the speed of the wind. Hail causes even more trouble. Image credit: Typical errors seen in the velocity data (left) and reflectivity data (right) when range folding and aliasing are occurring. Extra detail can also been seen at long-ranges, and the TDWRs should give us more detailed depictions of a hurricane's spiral bands as it approaches the coast.View of a tornado taken by conventional WSR-88D NEXRAD radar (left) and the higher-resolution TDWR system (right).

You can email us at The Terminal Doppler Weather Radar (TDWR) is an advanced technology weather radar deployed near 45 of the larger airports in the U.S.

RF stands for "Range Folding".The true wind direction can be determined on a radial velocity plot only where the radial velocity is zero (grey colors). These detectors all send their data to our central server where the StrikeStar software developed by Astrogenic Systems triangulates their data and presents the results in near real-time.A Terminal Doppler Weather Radar (TDWR). The radar beam can be envisioned as a line connecting the grey point with the center of the radar. Image credit: Because of its size and solid structure, hail is exceptionally good at reflecting energy. Since the radar is geared towards examining the weather in high detail at short range, echoes that come back from features that lie at longer ranges suffer from what is called range folding and aliasing. On the right, we can see the effect a strong thunderstorm with hail has on a TDWR. The radar (located in the lower left corner of the image) cannot see much detail directly behind the heavy pink echoes that denote the core of the hail region, creating a "shadow". Yellows are oranges are moderate rain. This Doppler effect was named after the Austrian physicist, Christian Doppler, who discovered it. The other scale represents dBZ values when the radar is in precipitation mode (dBZ values from 5 to 75).The scale of dBZ values is also related to the intensity of rainfall.

These "No Clutter" images are available on the web site.

This high-resolution data has generally not been available to the public until now. At distances within 48 nm of the TDWR, these radars can pick out the detailed structure of tornadoes and other important weather features (Figure 2). This process repeats fairly rapidly (about every 5-15 minutes).When grouped in a line, multicell thunderstorms are referred to as squall lines.Squall lines stretch over a hundred miles in length.

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