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- Doppler radar (4559 bytes)
1: ...urement of speeds. Doppler radars were originally developed for military radar systems, but have since...
4: ...borne targets — allowing aircraft to escape detection close to the ground. While this was only a...
6: ... on the relative speed of the target, the minimum detectable speed is a function of the narrowness of ...
8: ...und. This allows the radar to look straight down, detecting aircraft that were formerly invisible. As ...
10: ...h the returned pulse ''and'' the Doppler shift to detect targets.
Page text matches
- Meteorology (19082 bytes)
12: ...d in [[1667]] by [[Robert Hooke]], while [[Horace de Saussure]] completed this list of the most import...
14: ... was also the first American to keep accurate and detailed records of weather conditions on a daily ba...
16: ...s was understood. Early in the 20th century this deflecting force was named after [[Gaspard-Gustave C...
18: ...lowed exchange of weather information with unprecedented speed.
20: ... [[front (meteorology)|front]]s, that is, sharply defined boundaries between air masses. - Anemometer (11426 bytes)
1: ...6 m) lengths. The wire (4 conductors running inside a shield) runs along the rightmost leg of the 3 l...
3: ...έτρον, a measure), is a device for measuring either the [[wind speed|velocit...
5: Anemometers may be divided into two classes, (1) those that measure the [[v...
7: ..., of the velocity of the wind to that of the cups depends very largely on the dimensions of the cups a...
9: The other forms of velocity anemometer may be described as belonging to the [[windmill]] type. In ... - Pioneer 11 (5118 bytes)
5: ...neer 10. Three pairs of rocket [[thruster]]s provided spin-axis control (maintained at 4.8 rpm) and ch...
7: ...[[telescope]]s with overlapping fields of view to detect [[sunlight]] reflected from passing [[meteoro...
11: ...e Sun at a nearly [[asymptotic latitude]] of 17.4 degrees above the [[solar equatorial plane]] and was...
15: ...e origin of the spacecraft. It includes a drawing depicting a man, a woman, the transition of a hydrog... - Severe thunderstorm warning (1531 bytes)
1: ...ter]]s or [[doppler radar]] indicate a strong thunderstorm is producing dangerously large hail or high...
3: ...d States|U.S.]], the [[National Weather Service]] defines large hail as being at least 3/4 inch (20 [[...
5: ...understorm watch]] or [[tornado watch]] will precede a warning.
9: ...ce]] issues warnings for tornadoes and severe thunderstorms on a per-[[county]] basis.
11: ...rning''' must not be confused with a [[severe thunderstorm watch]]. - Tornado (14220 bytes)
3: ...[[Tornado Alley]]. Although in pure number of incidences, the [[United States]] experiences more torna...
8: ...], and sometimes [[hail]] are associated with thunderstorms. Many tornadoes appear at the tail end of...
10: ...otation can intensify and form tornadoes is not understood.
12: ...mes opposite direction swirls develop under a thunderstorm. And about 1 in 100 tornadoes rotate in an ...
14: ... high wind velocity and the associated wind-blown debris. Tornadic winds have been measured well in ex... - March 17 (9666 bytes)
6: ...[45 BC]] - In his last victory, [[Julius Caesar]] defeats the [[Pompey|Pompeian]] forces of [[Titus La...
11: ...], with [[Napoleon I of France|Napoleon]] as president, becomes the [[Kingdom of Italy (Napoleonic)|Ki...
16: ...Gogh]] paintings in [[Paris]], 11 years after his death, creates a sensation.
21: ...rt]] is officially opened by President [[Franklin Delano Roosevelt|Franklin D. Roosevelt]].
28: ...s with suppressing information related to the incident. - Weather forecasting (4312 bytes)
5: ...m forecast the weather for an area. These fall under two categories: tools for collecting data and t...
7: * '''Tools for collecting data''' include instruments such as [[thermometer]]s, [[barometer...
9: ...ather map]]s and [[Computer simulation|computer model]]s in the form of [[Numerical Weather Prediction...
13: a computer model in a process called ''assimilation''. This ensur...
14: computer model holds the current weather conditions as accurate... - Severe weather (844 bytes)
4: Examples include:
8: * [[thunderstorm]]
17: * [[derecho]]
20: Phenomena caused by severe weather include:
23: * [[landslide]], [[mudslide]] - Radar (16746 bytes)
3: ...nal returned is tiny, radio signals can easily be detected and [[amplification|amplified]].
5: ...like sound or visible light, would be too weak to detect.
11: ...l]], making radar particularly well suited to the detection of [[aircraft]] and [[ship]]s.
13: ...he targets and received a vague signal, whereas modern systems use shorter [[wavelength]]s (a few [[ce...
15: ...ally the same reasons objects attempting to avoid detection will angle their surfaces in a way to elim... - Doppler radar (4559 bytes)
1: ...urement of speeds. Doppler radars were originally developed for military radar systems, but have since...
4: ...borne targets — allowing aircraft to escape detection close to the ground. While this was only a...
6: ... on the relative speed of the target, the minimum detectable speed is a function of the narrowness of ...
8: ...und. This allows the radar to look straight down, detecting aircraft that were formerly invisible. As ...
10: ...h the returned pulse ''and'' the Doppler shift to detect targets. - Wind (17871 bytes)
6: ...s and are essentially unpredictable, such as dust devils and microbursts.
16: ...ion patterns]]. These include the [[Trade wind|Trade Winds]], the Westerlies, the Polar Easterlies, an...
20: ...r "track," and thus the phrase "the wind blows trade," that is to say, on track.
22: .... At about 30°N/S latitude, the air cools and descends. It then begins its journey back to the equ...
24: ...he Trades feed into the Westerlies, and thus provide a continuous zone of wind for ships travelling be...
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