![]() This is helpful for picking out snow/mix/rain transition zones In all snow situations, dBZ values of 40 indicate 3-4”/hr snowfall rates and whiteout conditions. Anything larger than this is usually due to “bright banding” where the radar is seeing the part of the atmosphere where snowflakes are clumping together and melting into raindrops. In cold climates during the winter months, actual dBZ values rarely exceed 40.This is your standard radar data that shows precip or other solid/liquid particles in the atmosphere. The first type of data currently available is reflectivity. We currently have two types of radar data available with plans to add more soon. Use radar data with caution especially if your area of interest is far from the nearest radar location! A lot can happen between 0 and 5,000 feet and therefore the depiction of precipitation given by radar may differ some from what’s actually happening on the ground. Because of this phenomenon, the radar beam will only see precipitation falling through the mid levels of the atmosphere. To see this in action, imagine a circle (earth) with a straight line emanating from some point on the circle if you continue this line out into space, it will gradually get farther and farther from the circle. Because the earth is round and the radar beam is flat, the farther away from the radar tower the beam (energy) travels, the farther removed from the ground becomes. There is a notable constraint to radar data though. This is the highest resolution radar data available which enables you to see features such as sea breeze or outflow boundaries that standard resolution radar entirely misses. This data is gathered from over a hundred radar towers located across the US. Lake Murray, Ardmore OK (WeatherOK, USA).Lightning CG worldwide (since 2004) Plus.Base reflectivity (with archive since 1991).Radar & Lightning Radar & Lightning Radar.Forecast Ensemble Heatmaps (Up to 7 models, multiple runs, graph up to 46 days) Plus.Forecast Ensemble (Up to 7 models, multiple runs, graph up to 46 days).Forecast XL (Graph and table up to 10 days - choose your model).14 day forecast (ECMWF-IFS/EPS, graphs with ranges).Meteograms (Graph 3-5 days - choose your model).Weather overview (Next hours and days, 14 day forecast).Europa Finnish HD HARMONIE (3 days) new.Tropical cyclone tracks (ECMWF/Ensemble).This sea clutter tends to remain in the same area and can therefore be distinguished from rain echoes, which generally move with the wind. They can often be tracked moving towards or away from port over a series of images.ĭuring strong winds and very rough seas, sea clutter may be visible off the coast out to a range of about 30 km. These appear as specks or short arcs (oriented perpendicular to the direction of the radar). Ships are regularly observed over the sea. ![]() On cold clear winter nights and mornings these echoes may become stronger or increase in number due to downward refraction of the radar beam. These usually show up as small, stationary or erratically moving specks, mostly over the higher ground of the Blue Mountains, Southern Highlands and Barrington Tops areas. Non-meteorological Echoes: In most cases, processing of the radar signal removes permanent echoes caused by hills, buildings and other solid objects, but sometimes a few slip through. People in the Newcastle, Hunter Valley and lower Mid North coast are therefore encouraged to refer to the nearer Newcastle radar, those in the Illawarra the Sydney (Appin) radar and users on the Southern Tablelands the Canberra radar. The high sensitivity of the radar will assist in the detection of drizzle and light shower activity over Sydney, the Central Coast and Blue Mountains, but, as with other radars, the curvature of the Earth may hide these usually shallow weather systems at longer range. Meteorological Aspects: The radar will readily detect thunderstorms and deep rain-bearing systems approaching from any direction, often at greater range than quoted above. Based on detecting echoes at an altitude of 3,000 metres, the radar coverage extends as far north as Bulahdelah and Scone, west to Mudgee and Bathurst and south to Goulburn and Ulladulla. The rough topography of the Great Dividing Range slightly compromises the radar's view to the west, but the coverage to the north, east and south is largely unobstructed. The Terrey Hills site, on the Hornsby plateau at an elevation of 195 metres above sea level, gives the radar an excellent view in all directions. Geographical Situation: The radar is located 18 km north of the Sydney CBD.
0 Comments
Leave a Reply. |