- 行业: Weather
- Number of terms: 60695
- Number of blossaries: 0
- Company Profile:
The American Meteorological Society promotes the development and dissemination of information and education on the atmospheric and related oceanic and hydrologic sciences and the advancement of their professional applications. Founded in 1919, AMS has a membership of more than 14,000 professionals, ...
Vinden eller komponenten av lindar längs lokalt, att skilja från zonal vinden Meridian. I ett horisontellt koordinatsystem fast lokalt med "x"-axeln som vetter mot öster och norr om axel "y", södra vinden är positivt om södra och negativa norr.
Industry:Weather
1. A violently rotating column of air, in contact with the ground, either pendant from a cumuliform cloud or underneath a cumuliform cloud, and often (but not always) visible as a funnel cloud. When tornadoes do occur without any visible funnel cloud, debris at the surface is usually the indication of the existence of an intense circulation in contact with the ground.
On a local scale, the tornado is the most intense of all atmospheric circulations. Its vortex, typically a few hundred meters in diameter, usually rotates cyclonically (on rare occasions anticyclonically rotating tornadoes have been observed) with wind speeds as low as 18 m s<sup>−1</sup> (40 mph) to wind speeds as high as 135 m s<sup>−1</sup> (300 mph). Wind speeds are sometimes estimated on the basis of wind damage using the Fujita scale. Some tornadoes may also contain secondary vortices (suction vortices). Tornadoes occur on all continents but are most common in the United States, where the average number of reported tornadoes is roughly 1000 per year, with the majority of them on the central plains and in the southeastern states (see Tornado Alley). They can occur throughout the year at any time of day. In the central plains of the United States they are most frequent in spring during the late afternoon. See Also supercell tornado, nonsupercell tornado, gustnado, landspout, waterspout.
2. A violent thundersquall in West Africa and adjacent Atlantic waters.
Industry:Weather
Filamen-seperti tonjolan dari chromosphere matahari. Prominences dapat diamati secara visual (optikal) setiap kali matahari dari disk adalah bertopeng, karena selama gerhana atau dengan menggunakan coronagraph; dan dapat diamati instrumental dengan menyaring di panjang gelombang tertentu, seperti halnya dengan spectroheliograph. Menonjol yang khas adalah 6000-12 000 km tebal, 60 000 km tinggi dan 200 000 km panjang. Fitur ini muncul sebagai filamen ketika mereka terlihat terhadap matahari disk.
Industry:Weather
Bagian dari spektrum elektromagnetik yang diapit tengah inframerah dan microwave. Ini mencakup panjang gelombang berkisar sekitar 15 PM-1 mm, namun penggunaan bervariasi.
Industry:Weather
Canal alcance o montante de um posto de aferição ou uma estrutura de controle; o alcance é escolhido tal que o fluxo é uniforme na estação.
Industry:Weather
Una quantità di vettore con componenti diversi da zero in aereo latitudine – altezza, la direzione e l'entità di cui determinare l'importanza relativa di flusso di calore eddy e momentum flux. Quando il flusso di Eliassen-Palm (EPF) vector punti verso l'alto, il flusso di calore meridional domina; Quando il vettore EPF punti nella direzione meridional, domina il meridional flusso zonale slancio. La divergenza del flusso Eliassen – Palm è più frequente come strumento diagnostico, come è proporzionale al flusso vorticità potenziale gorgo. Nel caso speciale quando la divergenza di EPF è zero, per quanto riguarda le onde costante, senza attrite, lineare, vento termico equilibrio è mantenuto in un'atmosfera zonally simmetrica idealizzata attraverso l'induzione di una circolazione meridiana media, anche se le onde producono significativo flussi di calore e lo slancio di gorgo.
Industry:Weather
