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  2. Hardiness zone - Wikipedia

    en.wikipedia.org/wiki/Hardiness_zone

    They are numerically about 6 lower than the USDA system. For example, Australian zone 3 is roughly equivalent to USDA zone 9. The higher Australian zone numbers had no US equivalents prior to the 2012 addition by USDA of zones 12 and 13. The spread of weather stations may be insufficient and too many places with different climates are lumped ...

  3. Tempest prognosticator - Wikipedia

    en.wikipedia.org/wiki/Tempest_prognosticator

    The tempest prognosticator, also known as the leech barometer, is a 19th-century invention by George Merryweather in which leeches are used in a barometer. The twelve leeches are kept in small bottles inside the device; when they become agitated by an approaching storm, they attempt to climb out of the bottles and trigger a small hammer which ...

  4. High-pressure area - Wikipedia

    en.wikipedia.org/wiki/High-pressure_area

    The horse latitudes, or torrid zone, [20] is roughly at the 30th parallel and is the source of warm high pressure systems. As the hot air closer to the equator rises, it cools, losing moisture; it is then transported poleward where it descends, creating the high-pressure area. [ 21 ]

  5. Köppen climate classification - Wikipedia

    en.wikipedia.org/wiki/Köppen_climate_classification

    [9] The Köppen climate classification system was modified further within the Trewartha climate classification system in 1966 (revised in 1980). The Trewartha system sought to create a more refined middle latitude climate zone, which was one of the criticisms of the Köppen system (the climate group C was too general). [10]: 200–1

  6. Tempest (codename) - Wikipedia

    en.wikipedia.org/wiki/Tempest_(codename)

    TEMPEST (Telecommunications Electronics Materials Protected from Emanating Spurious Transmissions [1]) is a U.S. National Security Agency specification and a NATO certification [2] [3] referring to spying on information systems through leaking emanations, including unintentional radio or electrical signals, sounds, and vibrations.

  7. Pole Vault (communications system) - Wikipedia

    en.wikipedia.org/wiki/Pole_Vault_(communications...

    Pole Vault was the first operational tropospheric scatter communications system. It linked radar sites and military airfields in Greenland and eastern Canada by telephone to send aircraft tracking and warning information across North America.

  8. BAE Systems Tempest - Wikipedia

    en.wikipedia.org/wiki/BAE_Systems_Tempest

    BAE Systems is the lead contractor for the FCAS project. While the name given to the new fighter aircraft that forms the centerpiece of the system was Project Tempest, FCAS includes a "game-changing mix of swarming drones and uncrewed aircraft" in addition to the new fighter jet. In addition, FCAS includes a new architecture for sensors ...

  9. Panhandle hook - Wikipedia

    en.wikipedia.org/wiki/Panhandle_Hook

    A common track of a Panhandle Hook winter storm as it curves from Texas, northeastward towards the Great Lakes region. A panhandle hook (also called a pan handle hook [1] or Texas hooker [2]) is a relatively infrequent winter storm system whose cyclogenesis occurs in the South to southwestern United States from the late fall through winter and into the early spring months.