Polar night In polar regions, the portion of the year when the Sun does not rise above the horizon. Its length changes from twenty hours at the Arctic/Antarctic Circle (latitude 66°33' N or S) to 179 days at the North/South Pole.
night-sky light"Same as airglow.
night visual range"(Also called nighttime visual range, transmission range.) The maximum distance at which a normal observer can see a particular point light source under given atmospheric conditions.
night wind - Dry squalls that occur at night in southwest Africa and the Congo. It is likely that this term is loosely applied to other diurnal local winds such as mountain wind, land breeze, midnight wind, etc.
NIGHT
The period of the day between dusk and dawn.
NIMBOSTRATUS
This cloud exhibits a combination of rain or snow, and sometimes the base of the cloud cannot be seen because of the heaviness of precipitation.
Midnight Sun: A high latitude phenomenon observed around midsummer when the sun does not sink below the horizon throughout the 24 hour period; therefore the sun may be seen at midnight.
Overnight, Tomorrow, Tomorrow Night
Operational Mode: A combination of scanning strategies and product mixes tailored to one or more meteorological situations.
Night
NHC
National Hurricane Center - one of three branches of the Tropical Prediction Center (TPC).
Night of the Twisters (TV), 1996
The Day After Tomorrow, 2004
The Wizard of Oz, 1939
Tornado! (TV), 1996
Twister, 1996 ...
NIGHT VISION - An electonic device allowing viewing and / or photography in near total darkness. Commonly uses infrared imaging or light amplification technologies. Some high end camcorders are equipped with night vision.
At night, the earth's surface cools by radiating heat off to space. The strongest cooling takes place right near the surface while temperatures at roughly 3000 feet are actually warmer than those at the surface.
Overnight temperatures tend to have increased more than daytime temperatures resulting in a decrease in the diurnal temperature range (the difference between the maximum and minimum temperatures during the day).
44. Nighttime Lights Throughout The World
45. NOAA National Data Center's Online Store
46. Links to United States Climatological Offices ...
Related term: night
DEBRIS CLOUD
Considered a rotating cloud of debris or dust that is on the ground or near the ground. The debris cloud appearing beneath a thunderstorm will most likely confirm the presence of a tornado.
Coromell A night land breeze prevailing from November to May at La Paz, near the southern extremity of the Gulf of California.
Fair (mainly for night)
Less than 4/10 opaque clouds, no precipitation, no extremes of visibility/temperature/wind
SKYWARN A nationwide network of volunteer weather spotters who report to and are trained by the National Weather Service.
Land breeze - night wind blowing across a beach onto the water. Sea breeze - midday wind blowing across a beach onto the land. Both of these winds blow on the warmer surface.
Day of the week (eg. Monday)Midnight to midnight.Debris cloudA rotating "cloud" of dust or debris, near or on the ground, often appearing beneath a condensation funnel and surrounding the base of a tornado.
Due to the frequent winds created by surface heating, they are most predominate during the day and die out in the night.
At night, the Earth suffers a net heat loss to space due to terrestrial cooling. This is more pronounced when you have a clear sky.
Thermal BeltA zone of high nighttime temperatures (and relatively low humidities) that is often experienced within a narrow altitude range on valley sidewalls, especially evident during clear weather with light winds.
They take up gaseous carbon dioxide at night when the stomata are open and water loss is minimal. During the day when the stomata are closed, the stored CO2 is released and chemically processed.
DrainerA valley or basin from which air drains continuously during nighttime rather than becoming trapped or pooled.
Allard's law A basic equation in night visual range theory, relating the illuminance of a point source of light to distance and the transmissivity of the atmosphere. ALOHA Areal Locations of Hazardous Atmospheres.
A common misconception, is that it must be coldest in the middle of the night, and warmest around midday. On some occasions, mainly due to air mass changes, this may be correct, but not usually.
visibility - 1. The greatest distance in a given direction at which it is just possible to see and identify with the unaided eye 1) in the daytime, a prominent dark object against the sky at the horizon, and 2) at night, a known, ...
It has been observed in some places that the January wind is relatively constant through the 24 hours of the day, while the July wind is perhaps half as large during the night, but increases to a noon maximum near the January level.
provide continuous day and night weather observations;
monitor severe weather events such as hurricanes, thunderstorms, and flash floods;
relay environmental data from surface collection platforms to a processing center; ...
The cooling of the ground results from night time loss of heat from the Earth to space (terrestrial radiation). Favorable conditions for radiation fog are clear sky, little or no wind, and high relative humidity.
(abbrev. MCC)- A large MCS, generally round or oval-shaped, which normally reaches peak intensity at night.
The word "fair" has been used to describe a particular weather condition for ages, as in "the weather faired as the night went on," or "fair skies are expected for star gazing," or "the parade will go on whether the weather be fair or foul.
The calendar year begins at 12 o'clock midnight local time on the night of December 31st-January 1st. Currently, the Gregorian calendar of 365 days is used, with 366 days every four years, a leap year.
The ideal conditions for dew are a still, clear night, high humidity in the air next to the ground, and low humidity in the air above.
Aurora borealis A luminous phenomenon in the night sky consisting of overlapping curtains of greenish-white light, sometimes fringed with pink, appearing in the ionosphere of high latitudes.
MOUNTAIN BREEZE A katabatic wind, it is formed at night by the radiational cooling along mountainsides. As the slopes become colder than the surrounding atmosphere, the lower levels of air cool and drain to the lowest point of the terrain.
Dew Point - As the surface of the earth cools at night, warm moist air near the ground is chilled and water vapour in the air condenses into droplets on the grass and other objects.
Nocturnal Related to nighttime, or occurring at night.
Nor'easter- A low-pressure disturbance forming along the South Atlantic coast and moving northeast along the Middle Atlantic and New England coasts to the Atlantic Provinces of Canada.
Land and Sea Breezes: Local winds caused by the unequal warming and cooling of adjacent water and land surfaces under the influence of solar radiation (during the day) and land radiation (during the night), ...
Nocturnal - Related to nighttime, or occurring at night.
Nowcast - A short-term weather forecast, generally out to six hours or less.
NSSFC - National Severe Storms Forecast Center, in Kansas City MO; now known as SPC.
The dry line typically advances eastward during the afternoon and retreats westward at night. However, a strong storm system can sweep the dry line eastward into the Mississippi Valley, or even further east, regardless of the time of day.
FORECAST PERIODS - Routine forecasts issued before noon contain three forecast periods: Today (or this Afternoon), Tonight, and the Next Day.
Aurora Glowing light display in the nighttime sky caused by excited gases in the upper atmosphere giving off light.
aurora: appears as greenish-white and sometimes pink light in the night sky over the middle and high latitudes. Called the aurora borealis in the Northern Hemisphere and the aurora australis in the Southern Hemisphere.
Aurora - a luminous phenomenon in the night sky which results from a radiation emission in the upper atmosphere over middle and high latitudes
Aurora Australis - the name for the aurora of the southern latitudes ...
Equinox: the time when the sun crosses the earth's equator, making night and day of approximately equal length all over the earth and occurring about March 21 (the spring or vernal equinox) and September 22 (autumnal equinox).
F ...
TULE FOG: Radiation fog in the Central Valley. It forms during night and morning hours in late fall and winter months following the first significant rainfall. A leading cause of weather related casualties in California.
One complete spin takes 24 hours, and at any moment, half of the earth is lit and warm (day), while the other half faces away from the sun (night).
A valley bottom where cold dense air below 0 degrees Celsius collects at night
Fujita Scale
A scale for estimating damage caused by the winds of a tornado, developed by Theodore Fujita. Similar to the Torro scale.
Radiational Cooling - The cooling of the lower atmosphere during the nighttime hours. This, in combination with light surface winds and relatively clear skies, will often set the stage for fog.
Land breeze A coastal breeze that blows from land to sea, usually at night.
Lapse rate The rate at which an atmospheric variable (usually temperature) decreases with height. (See Environmental lapse rate.) ...
NOCTURNAL- A weather feature that occurs at night (i.e. nocturnal inversion)
NOGAPS- Forecast model. Developed by the US Navy to compare with the GFS ...
Advisories are issued as six-hour intervals at midnight, 6 a.m., noon and 6 p.m., Eastern daylight time. Bulletins provide additional information. Each message gives the name, eye position, instensity and forecast movement of the storm.
MOUNTAIN WINDS (DOWNSLOPE) - Winds that blow from the mountain to the valley (usually at night).
MUSH - The action of descending in a semi-stalled mode.
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ceiling light—An instrument which projects a vertical light beam onto the base of a cloud or into surface-based obscuring phenomena; used at night in conjunction with a clinometer to determine the height of the cloud base or as an aid in ...
as temperature rises during the day, relative humidity goes down because the moisture capacity of the air increases
as temperature falls overnight, relative humidty goes up because the moisture capcity of the air decreases ...
CLINOMETER An instrument used to measure angles of inclination. Used in conjunction with a ceiling light, it determines cloud height at night, based on the angle of a projected light on the clouds, the observer, and the ceiling light.
Heat Advisory- Issued when heat index is expected to reach at least 100F but less than 105F, or when nighttime lows are expected to remain above 80F.
A small-scale wind circulation set off by differences in water and land temperatures along the coast. The land breeze develops at night and always blows from the land. Its counterpart is the sea breeze.
Leeward ...
HEAT ADVISORY: Issued when the Heat Index is expected to exceed 105 during the day and 80 during the night for at least two consecutive days.
A faint visual phenomenon associated with geomagnetic activity, which occurs mainly in the high-latitude night sky; typical auroras are 100 to 250 km above the ground
Aurora Australis ...
Land Breeze - A local wind blowing from the land toward the sea during the night in coastal areas.
 See also: Weather, Temperature, Air, Surface, High
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