1/2/2024 0 Comments Weather radar of houstonWithout rain, nothing keeps existing hot air from getting hotter, according to the National Weather Service.įORECAST: Houston's extremely hot weather won't let up: Heat misery to persist until next weekend Under a heat dome, the high-pressure system forces air downward and prevents air near the ground from rising and turning into rain. But the high-pressure system affecting Texas is keeping clouds from forming, which means clear skies but also the prospect of relentless heat from sunshine. In low-pressure systems, the rising air can carry water vapor into the colder reaches of the atmosphere, where it can condense and turn into rain. Meanwhile, powerful high pressure systems can sometimes park themselves over one spot and create what we think of as a heat dome. Low pressure systems, when fueled by a steady diet of summertime heat and warm ocean temperatures, can strengthen to become tropical cyclones like Bret and Cindy. This summer, we’ve seen some of the most extreme versions of high and low pressure systems. Some turn counterclockwise and allow air to flow upward, leading to spots with lower air pressure. Some turn clockwise and force air downward, producing areas with higher air pressure. Doppler observations can also reveal the presence of flocks of birds over Port Phillip Bay, which appear as thin lines, and generally have a higher velocity than the surrounding area.TEXAS HEAT TRACKER: How hot is it in Houston today, and is the temperature normal?Īs the Earth rotates, eddies of dense air circulate in the upper atmosphere. These appear as radials of incorrect Doppler velocities in the area to the northeast of the radar. These echoes may be distinguished from rain as they do not move with the wind and end abruptly at the shoreline of the bay.Doppler observations are occasionally affected by multi path reflections off Melbourne City buildings and approaching rain bands. Because the radar has an unobstructed view of Port Phillip Bay out to about 25km, sea-clutter may be seen over the bay during strong winds. These usually become more noticeable on cold, clear, winter nights or early winter mornings. These echoes usually occur along ridges and peaks as isolated, stationary patches, being most common near the Yarra Ranges to the ENE and Mount Macedon to the north. Occasionally, some permanent echoes will not be completely removed from the display. Non-meteorological aspects In most cases the processing of the radar signal removes permanent echoes caused by obstructions such as hills, buildings and other solid objects rather than rainfall. The location on the floor of a wide basin is ideal for Doppler observations which provide wind speed information. Similarly, cold fronts and associated rain and thunderstorms approaching from the northwest, through west and south are well detected. Summer thunderstorms that develop on the surrounding hills and mountains may be observed in detail. The high ground from the east, through north and to the south west tends to obscure shallow rain falling further away. Meteorological Aspects The radar is well sited to provide very good coverage for the Greater Melbourne Metropolitan Area. The most significant obstructions, starting from the east, are: Mt Dandenong 644m high, 53km to the east Yarra ranges 1219m, 83km to ENE Mt Macedon 1013m, 56km to the north Pentland Hills 763m and the Brisbane ranges 421m, 45km from the NNW through to the west and the You Yangs 363m, 30km to the SW. The Great Dividing Range dominates the topography from the east, through the north to the west. The radar is on a tower 24m above ground level. Geographical Situation The radar is situated on the western plains of the Melbourne basin some 19km west-south-west of the Central Business District, about six kilometres from the western shores of Port Phillip bay and on a low rise about 20m above mean sea level.
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