48 Sentences With "warm fronts" | Random Sentence Generator

Or maybe you used to feel electric discussing things like warm fronts and lightning strikes, but lately your weather conversations lack, shall we say, thermal convection.

The state of North Carolina has had above-average rainfall in 2018 due to a steady stream of non-tropical low-pressure systems, cold and warm fronts, and daytime thunderstorms, according to the National Weather Service in Wilmington.

While other parts of the country receive precipitation from various types of storms, such as everything from low pressure systems and warm fronts to hurricanes along the East Coast, California is highly dependent on atmospheric rivers for its annual precipitation.

Subtropical storms are low pressure centers that have characteristics of both tropical storms (which have warm cores and get their energy from warm ocean water) and more traditional storm systems (which have cold cores that get their energy from clashes of warm and cold air) that occur in the midlatitudes with cold and warm fronts.

Warm fronts are usually preceded by stratiform precipitation and fog. The weather usually clears quickly after a front's passage. Some fronts produce no precipitation and little cloudiness, although there is invariably a wind shift. Cold fronts and occluded fronts generally move from west to east, while warm fronts move poleward.

Illustration clouds overriding a warm front Warm fronts mark the position on the Earth's surface where a relatively warm body of air has displaced colder air. The temperature increase is located on the equatorward edge of the gradient in isotherms, and lies within broader low pressure troughs than is the case with cold fronts. Warm fronts move more slowly than do the cold fronts because cold air is denser, and harder to displace from the Earth's surface. This causes temperature differences across warm fronts to be broader in scale.

Some fronts produce no precipitation and little cloudiness, although there is invariably a wind shift. Cold fronts and occluded fronts generally move from west to east, while warm fronts move poleward. Because of the greater density of air in their wake, cold fronts and cold occlusions move faster than warm fronts and warm occlusions. Mountains and warm bodies of water can slow the movement of fronts.

QuikSCAT image of typical extratropical cyclones over the ocean. Note the maximum winds are on the outside of the occlusion. The windfield of an extratropical cyclone constricts with distance in relation to surface level pressure, with the lowest pressure being found near the center, and the highest winds typically just on the cold/poleward side of warm fronts, occlusions, and cold fronts, where the pressure gradient force is highest. The area poleward and west of the cold and warm fronts connected to extratropical cyclones is known as the cold sector, while the area equatorward and east of its associated cold and warm fronts is known as the warm sector.

Orographic precipitation is precipitation created through the lifting action of air moving over terrain such as mountains and hills, which is most common behind cold fronts that move into mountainous areas. It may sometimes occur in advance of warm fronts moving northward to the east of mountainous terrain. However, precipitation along warm fronts is relatively steady, as in rain or drizzle. Fog, sometimes extensive and dense, often occurs in pre-warm-frontal areas.

Warm fronts generally move from southwest to northeast. If the warmer air originates over the ocean, it is not only warmer but also more moist than the air ahead of it.

Weather fronts mark the boundary between two masses of air of different temperature, humidity, and densities, and are associated with the most prominent meteorological phenomena. Strong cold fronts typically feature narrow bands of thunderstorms and severe weather, and may on occasion be preceded by squall lines or dry lines. Such fronts form west of the circulation center and generally move from west to east; warm fronts form east of the cyclone center and are usually preceded by stratiform precipitation and fog. Warm fronts move poleward ahead of the cyclone path.

Warm fronts are at the leading edge of a homogeneous warm air mass, which is located on the equatorward edge of the gradient in isotherms, and lie within broader troughs of low pressure than cold fronts. A warm front moves more slowly than the cold front which usually follows because cold air is denser and harder to remove from the Earth's surface. This also forces temperature differences across warm fronts to be broader in scale. Clouds ahead of the warm front are mostly stratiform, and rainfall gradually increases as the front approaches.

Warm fronts are followed by extended periods of light rain and drizzle due to the fact that, after the warm air rises above the cooler air (which remains on the ground), it gradually cools due to the air's expansion while being lifted, which forms clouds and leads to precipitation. Cold fronts occur when a mass of cooler air dislodges a mass of warm air. This type of transition is sharper, since cold air is more dense than warm air. Precipitation duration is often shorter and generally more intense than that which occurs ahead of warm fronts.

A warm front is a density discontinuity located at the leading edge of a homogeneous warm air mass, and is typically located on the equator-facing edge of an isotherm gradient. Warm fronts lie within broader troughs of low pressure than cold fronts, and move more slowly than the cold fronts which usually follow because cold air is denser and less easy to remove from the Earth's surface. This also forces temperature differences across warm fronts to be broader in scale. Clouds ahead of the warm front are mostly stratiform, and rainfall gradually increases as the front approaches.

Ali started her career in 2005, when she released her first record Warm Fronts EP. In 2006, her debut album Asha Ali was issued. Her follow-up album Hurricane arrived in 2009. Ali has also worked with Brothers Lindgren on children's music.

When noted on weather radar imagery, this precipitation elongation is referred to as banded structure.Glossary of Meteorology (2009). Banded structure. Retrieved on 2008-12-24. Rainbands in advance of warm occluded fronts and warm fronts are associated with weak upward motion,Owen Hertzman (1988).

Most precipitation in the tropics appears to be convective; however, it has been suggested that stratiform precipitation also occurs. Graupel and hail indicate convection. In mid-latitudes, convective precipitation is intermittent and often associated with baroclinic boundaries such as cold fronts, squall lines, and warm fronts.

The warmest recorded overnight low was on July 28, 2009. A temperature of has been recorded in all five months from May through September. Spring and fall can bring variable weather including warm fronts that send temperatures surging above and cold snaps that plunge daytime temperatures into the 40s °F (4–9 °C).

The air masses separated by a front usually differ in temperature and humidity. Cold fronts may feature narrow bands of thunderstorms and severe weather, and may on occasion be preceded by squall lines or dry lines. Warm fronts are usually preceded by stratiform precipitation and fog. The weather usually clears quickly after a front's passage.

The first freeze typically occurs around October 10 and the last can happen as late as May 4. Extratropical cyclones which disrupt the weather for the eastern two-thirds of the US often originate in or near Colorado, which means Greeley does not experience many fully developed storm systems. Warm fronts, sleet, and freezing rain are practically nonexistent here.

However, temperatures can swing up and down in days, often one after another, since cold fronts and warm fronts visit frequently. It is not uncommon to see 70s for highs two days and temperatures in the teens for lows the next. Annual snowfall only yields an average of 4 inches, and accumulations for more than a day are rare.

Frontogenesis is a meteorological process of tightening of horizontal temperature gradients to produce fronts. In the end, two types of fronts form: cold fronts and warm fronts. A cold front is a narrow line where temperature decreases rapidly. A warm front is a narrow line of warmer temperatures and essentially where much of the precipitation occurs.

In turn, precipitation can enhance the temperature and dewpoint contrast along a frontal boundary. Passing weather fronts often result in sudden changes in environmental temperature, and in turn the humidity and pressure in the air at ground level. Warm fronts occur where warm air pushes out a previously extant cold air mass. The warm air overrides the cooler air and moves upward dud .

Approaching weather fronts are often visible from the ground, but are not always as well defined as this. A weather front is a boundary separating bands of thunderstorms and severe weather, and may on occasion be preceded by squall lines or dry lines. Warm fronts are usually preceded by stratiform precipitation and fog. The weather usually clears quickly after a front's passage.

A surface weather analysis for the United States on October 21, 2006. Note the warm front in the northwest Gulf of Mexico. On weather maps, the surface location of a warm front is marked with a red line of half circles pointing in the direction of the front. On colored weather maps, warm fronts are illustrated with a solid red line.

Because of the greater density of air in their wake, cold fronts and cold occlusions move faster than warm fronts and warm occlusions. Mountains and warm bodies of water can slow the movement of fronts. When a front becomes stationary, and the density contrast across the frontal boundary vanishes, the front can degenerate into a line which separates regions of differing wind velocity, known as a shearline. This is most common over the open ocean...

Fronts are generally guided by winds aloft, but do not move as quickly. Cold fronts and occluded fronts in the Northern Hemisphere usually travel from the northwest to southeast, while warm fronts move more poleward with time. In the Northern Hemisphere a warm front moves from southwest to northeast. In the Southern Hemisphere, the reverse is true; a cold front usually moves from southwest to northeast, and a warm front moves from northwest to southeast.

A February 24, 2007 radar image of a large extratropical cyclonic storm system at its peak over the central United States. Note the band of thunderstorms along its trailing cold front. Rainbands in advance of warm occluded fronts and warm fronts are associated with weak upward motion,Owen Hertzman (1988). Three-Dimensional Kinematics of Rainbands in Midlatitude Cyclones. Retrieved on 2008-12-24 and tend to be wide and stratiform in nature.Yuh-Lang Lin (2007).

An occluded front came off the low pressure area and split into cold and warm fronts with the former stretching southwestward into Kansas while the later moved into Southern Lower Michigan. With temperatures ranging from the lower 60s to the upper 70s, dewpoint temperatures ranging from the mid 50s to upper 60s, and upper-level wind shear of up to 65 knots, the atmosphere for the development of thunderstorms sparking a severe weather outbreak.

Supercellular thunderstorm image showing cumulus inflow bands Inflow is the flow of a fluid into a large collection of that fluid. Within meteorology, inflow normally refers to the influx of warmth and moisture from air within the Earth's atmosphere into storm systems. Extratropical cyclones are fed by inflow focused along their cold front and warm fronts. Tropical cyclones require a large inflow of warmth and moisture from warm oceans in order to develop significantly, mainly within the lowest of the atmosphere.

A second competing theory for extratropical cyclone development over the oceans is the Shapiro-Keyser model, developed in 1990. Its main differences with the Norwegian Cyclone Model are the fracture of the cold front, treating warm-type occlusions and warm fronts as the same, and allowing the cold front to progress through the warm sector perpendicular to the warm front. This model was based on oceanic cyclones and their frontal structure, as seen in surface observations and in previous projects which used aircraft to determine the vertical structure of fronts across the northwest Atlantic.

At the time, the storm had maximum sustained winds of 100 mph (160 km/h), which it maintained throughout its duration as a Category 2 system. Progressing rapidly into more northerly latitudes, the storm weakened to a Category 1 hurricane by 1800 UTC on September 15\. By the next day, two warm fronts began extending eastward from the cyclone as the wind field expanded in size, indicating the start of an extratropical transition. At 0200 UTC, the hurricane made landfall near Lockeport, Nova Scotia, with winds of 85 mph (135 km/h).

On a synoptic scale, isentropic analysis is associated with weather fronts: warm fronts are found where the wind crosses lines of a chosen potential temperature from lower heights to higher ones, while cold fronts are where the wind crosses descending heights. Synoptic clouds and precipitations can thus be better found with these areas of advection than with conventional isobaric maps. From a mesoscale point of view, an air parcel moving vertically will cross isolines of potential temperature and it will be unstable if the value of those lines decrease with altitude, or stable if they increase.

Occluded front depiction for the Northern Hemisphere An occluded front is formed when a cold front overtakes a warm front, and usually forms around mature low-pressure areas. The cold and warm fronts curve naturally poleward into the point of occlusion, which is also known as the triple point. It lies within a sharp trough, but the air mass behind the boundary can be either warm or cold. In a cold occlusion, the air mass overtaking the warm front is cooler than the cool air ahead of the warm front and plows under both air masses.

Frontal and cyclonic lift occur in their purest manifestations when stable air, which has been subjected to little or no surface heating, is forced aloft at weather fronts and around centers of low pressure. Warm fronts associated with extratropical cyclones tend to generate mostly cirriform and stratiform clouds over a wide area unless the approaching warm airmass is unstable, in which case cumulus congestus or cumulonimbus clouds will usually be embedded in the main precipitating cloud layer. Cold fronts are usually faster moving and generate a narrower line of clouds which are mostly stratocumuliform, cumuliform, or cumulonimbiform depending on the stability of the warm air mass just ahead of the front.

Because of its location to the coast, as well as the protective nature of the Oregon Coast Range to its west, Birkenfeld summers are less susceptible to the moderating influence of the nearby Pacific Ocean. Spring and fall can bring variable weather including warm fronts that send temperatures surging above and cold snaps that plunge daytime temperatures into the 40s °F (4–9 °C). However, lengthy stretches of overcast days beginning in mid fall and continuing into mid spring aare most common. Rain often falls as a light drizzle for several consecutive days at a time, contributing to 152 days on average with measurable (≥) precipitation annually.

One symbol of an occluded front Trowal symbol with alternating blue and red lines similar to a cold/warm front junction A cold front would be seen as spikes and a warm front as semi-circles in a traditional weather map. An occluded front, is a combination of those two signs. They are indicated on a weather map either by a purple line with alternating semicircles and triangles pointing in direction of travel, or by red semicircles and blue triangles pointing in the same direction. On the other hand, trowal are indicated by junction of blue and red lines like the junction of cold and warm fronts aloft.

Because of its inland location from the coast, as well as the protective nature of the Oregon Coast Range to its west, Newberg summers are less susceptible to the moderating influence of the nearby Pacific Ocean. Consequently, Portland experiences heat waves on rare occasion, with temperatures rising into the for a few days. However, on average, temperatures reach or exceed on only 56 days per year, of which about 12 days will reach and only 1–2 days will reach . SSpring and fall can bring variable weather including warm fronts that send temperatures surging above and cold snaps that plunge daytime temperatures into the 40s °F (4–9 °C).

This can occur when, for example, a warmer, less-dense air mass moves over a cooler, denser air mass. This type of inversion occurs in the vicinity of warm fronts, and also in areas of oceanic upwelling such as along the California coast in the United States. With sufficient humidity in the cooler layer, fog is typically present below the inversion cap. An inversion is also produced whenever radiation from the surface of the earth exceeds the amount of radiation received from the sun, which commonly occurs at night, or during the winter when the angle of the sun is very low in the sky.

This type of false return is relatively easy to spot on a time loop if it is due to night cooling or marine inversion as one sees very strong echoes developing over an area, spreading in size laterally but not moving and varying greatly in intensity. However, inversion of temperature exists ahead of warm fronts and the abnormal propagation echoes are then mixed with real rain. The extreme of this problem is when the inversion is very strong and shallow, the radar beam reflects many times toward the ground as it has to follow a waveguide path. This will create multiple bands of strong echoes on the radar images.

On the west side of a typical mid-latitude cyclone, there are northerly winds (N/H) or southerly winds (S/H) (associated with cold air) and east of the cyclone, southerly winds (N/H) or northerly winds (S/H) (associated with warm air); resulting in horizontal shear deformation. In the end, this results to concentrate a cyclonic shear along a line of maximum shear (which in this case is the birth of a cold front). On the eastern side of a cyclone, horizontal deformation is seen which turns into confluence (a result of translation + deformation). Horizontal deformation at low levels is an important mechanism for the development of both cold and warm fronts (Holton, 2004).

Stratiform (a broad shield of precipitation with a relatively similar intensity) and dynamic precipitation (convective precipitation which is showery in nature with large changes in intensity over short distances) occur as a consequence of slow ascent of air in synoptic systems (on the order of cm/s), such as in the vicinity of cold fronts and near and poleward of surface warm fronts. Similar ascent is seen around tropical cyclones outside the eyewall, and in comma-head precipitation patterns around mid-latitude cyclones. A wide variety of weather can be found along an occluded front, with thunderstorms possible, but usually their passage is associated with a drying of the air mass. Occluded fronts usually form around mature low-pressure areas.

Warm fronts associated with extratropical cyclones tend to generate mostly cirriform and stratiform clouds over a wide area unless the approaching warm airmass is unstable, in which case cumulus congestus or cumulonimbus clouds are usually embedded in the main precipitating cloud layer. Cold fronts are usually faster moving and generate a narrower line of clouds, which are mostly stratocumuliform, cumuliform, or cumulonimbiform depending on the stability of the warm airmass just ahead of the front. Windy evening twilight enhanced by the Sun's angle, can visually mimic a tornado resulting from orographic lift A third source of lift is wind circulation forcing air over a physical barrier such as a mountain (orographic lift). If the air is generally stable, nothing more than lenticular cap clouds form.

Mesoscale convective systems are thunderstorm regions which may be round or linear in shape, on the order of or more across in one direction but smaller than extratropical cyclones, and include systems such as tropical cyclones, squall lines, and Mesoscale Convective Complexes (MCCs), among others. MCS is a more generalized term which includes systems that do not satisfy the stricter size, shape, or duration criteria of an MCC. They tend to form near weather fronts and move into areas of 1000-500 mb thickness diffluence, which are areas where the low to mid level temperature gradient broadens, which generally steers the thunderstorm clusters into the warm sector of extratropical cyclones, or equatorward of warm fronts. They can also form along any convergent zones within the tropics.

A cold front is located at the leading edge of the temperature drop off, which in an isotherm analysis shows up as the leading edge of the isotherm gradient, and it normally lies within a sharp surface trough. Cold fronts often bring heavy thunderstorms, rain, and hail. Cold fronts can produce sharper changes in weather and move up to twice as quickly as warm fronts, since cold air is denser than warm air and rapidly replaces the warm air preceding the boundary. On weather maps, the surface position of the cold front is marked with the symbol of a blue line of triangle-shaped pips pointing in the direction of travel, and it is placed at the leading edge of the cooler air mass.

A cold front's location is at the leading edge of the temperature drop-off, which in an isotherm analysis shows up as the leading edge of the isotherm gradient, and it normally lies within a sharp surface trough. Cold fronts can move up to twice as fast as warm fronts and produce sharper changes in weather, since cold air is denser than warm air and rapidly lifts the warm air as the cold air moves in. Cold fronts are typically accompanied by a narrow band of showers and thunderstorms. On a weather map, the surface position of the cold front is marked with the symbol of a blue line of triangles/spikes (pips) pointing in the direction of travel, at the leading edge of the cooler air mass.

In the odd case when Breitenthal finds itself on the windward side of the Idar Forest, there can be prolonged rainfall and low cloud ceilings ahead of warm fronts as long as the wind is out of the south (between 150° and 210°) and the dew point spread is only slight. The village is practically fog-free; only radiation fog is seen now and then, as well as the odd advection fog inflow from the Hosenbach valley within the framework of a local atmospheric circulation that forms with low-gradient anticyclonic weather systems. When there is a slight westerly wind, it can sometimes bring about an advection-induced hill fog on the saddle south of the village (in the training ground area) if moist air flowing from the Schielenbach condenses once it is lifted up. The village itself is not usually affected by this.