Cold Fronts and Occluded Fronts in Weather Systems

Cold
 
Fronts
A cold front is the transition zone in
the 
 where an advancing cold, dry
stable 
 displaces a warm, moist unstable
subtropical air mass. On a weather map, the cold
front is drawn as a solid blue line with triangles. The
position of the triangles shows the direction of frontal
movement. Cold fronts move between 15 to 50
kilometers per hour in a southeast to east direction.
The formation of clouds and precipitation at the
frontal zone is caused by frontal lifting. High
altitude 
 clouds are found well in advance of
the front. Above the surface location of the cold
front, high altitude 
 and middle
ltitude 
 are common. 
 is
normally found just behind the front where frontal
lifting has caused the development of
towering 
 and 
 clouds#
cumulonimbuscumulusPrecipitationaltocumuluscirrostratuscirrusair massatmosphere
Cold
 
Fronts
الجبهة الباردة هي المنطقة الانتقالية في الغلاف الجوي حيث
تتسبب الكتلة الهوائية الباردة المستقرة والجافة المتقدمة في
إزاحة كتلة هواء شبه استوائية دافئة ورطبة غير مستقرة. على
خريطة الطقس ، يتم رسم الجبهة الباردة كخط أزرق صلب مع
مثلثات. يُظهر موضع المثلثات اتجاه الحركة الأمامية. تتحرك
الجبهات الباردة بين 15 إلى 50 كيلومترًا في الساعة في اتجاه
الجنوب الشرقي إلى الشرق. يحدث تكوين الغيوم وهطول
الأمطار في المنطقة الأمامية بسبب الرفع الأمامي. تم العثور
على السحب المرتفعة المرتفعة مقدما بوقت طويل من الأمام.
فوق الموقع الأمامي للجبهة الباردة ، فإن 
cirrostratus 
على
ارتفاعات عالية وخط مرتفع متوسط ​​الارتفاع هو أمر شائع.
عادة ما يتم العثور على هطول الأمطار خلف الجبهة مباشرة
حيث تسبب الرفع الأمامي في تطوير تراكم شاهق وسحب
تراكمية
C
o
n
t
d
Identification and Frontal
 
Weather
During
 
After
 
Passage
Passage
Weather
 
Before
 
Passage
Element
Temperature
W
arm
Sharp
 
drop
C
older
W
i
n
d
s
South or
 
southwest
Variable 
and
 
gusty
West 
or
 
northwest
Precipitation
None 
or
 
showers
Thunderstorms
in 
summer, 
rain 
or
 
snow
in
 
winter
Clea
ri
n
g
Clouds
None, cumulus,
 
or
cumulonimbus
Cumulonimbus
None 
or 
cumulus
 
in
summer
Pressure
Falling 
then
 
rising
Ri
s
i
n
g
Ri
s
i
n
g
Humidi
t
y
High, 
particularly
 
in
summer
D
r
o
p
pi
ng
Low,
 
particularly
in
 
winter
Occluded
 
Fronts
Occluded fronts are produced when a fast moving cold front catches and overtakes a slower
moving warm front. Two types of occluded fronts are generally recognized. A cold type
occluded front occurs when the air behind the front is colder than the air ahead of the front.
When the air behind the front is warmer than the air ahead of the front a warm type
occluded front is produced. Warm type occlusions are common on the west coast of
continents and generally form when maritime polar air collides with continental polar or
arctic air. The cross-section diagram in Figure illustrates a cold type occlusion. Note that in
the occlusion process the invading mild moist air that was found behind the warm front has
been lifted into the upper troposphere.
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.
Occluded Front Helps to Generate a Mid-Latitude
Cyclone
when a cold front overtakes a warm front A developing cyclone typically has a preceding
warm front (the leading edge of a warm moist air mass) and a faster moving cold front (the
leading edge of a colder drier air mass wrapping around the storm). North of the warm front
is a mass of cooler air that was in place before the storm even entered the region.
Occluded Front Helps to Generate a Mid-Latitude
Cyclone
عندما تتفوق جبهة باردة على جبهة دافئة ، يكون للإعصار النامي عادةً جبهة دافئة
سابقة (الحافة الأمامية لكتلة هواء رطبة دافئة) وجبهة باردة متحركة أسرع (الحافة
الأمامية لكتلة هواء أكثر برودة وبرودة حول العاصفة). إلى الشمال من الجبهة الدافئة
كتلة من الهواء البارد كانت موجودة قبل دخول العاصفة إلى المنطقة.
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During the formation of an occluded front, the Bergen meteorologists believed that if the
polar air behind the cold front was colder (and thus denser) than the polar air ahead of
the warm front, then this less dense air and the associated warm front would ride up off
the ground over the cold front as the occluded front formed. This type of structure is
called a cold-type occlusion.
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Warm-Type 
Occluded
 
Fronts
A warm air occlusion or occluded front is less common than a cold occlusion. A warm
occlusion occurs as cool air moves rapidly into an area with an existing warm front.
The difference from a cold occlusion is that the approaching cool air is not as cold as
the retreating 
cold
 air in the existing front. In other words, the fast-moving, incoming
air is cold, but not as cold as the air mass ahead of it. 
Precipitation
 can usually be
expected when an occluded front passes through an area.
Warm-Type 
Occluded
 
Fronts
إن ملتحمه الهواء الدافئ أو الجبهة الملتحمه أقل شيوعًا من الملتحمه البارد. يحدث الملتحمه الدافئه عندما
يتحرك الهواء البارد بسرعة إلى منطقة ذات جبهة دافئة موجودة. الفرق من الملتحمه البارده هو أن الهواء
البارد المقترب ليس باردًا مثل الهواء البارد المتراجع في الجبهة الحالية. وبعبارة أخرى ، الهواء سريع الحركة
والوارد بارد ، ولكن ليس باردًا مثل كتلة الهواء أمامه. يمكن توقع هطول الأمطار عادة عندما تمر جبهة
ملتحمه عبر منطقة.
 
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Cold fronts occur when advancing cold, dry air displaces warm, moist air, causing changes in temperature, winds, precipitation, and pressure. Occluded fronts result from a cold front overtaking a warm front, leading to the formation of mid-latitude cyclones. Different types of occlusions, like the cold-type occluded fronts, can influence weather patterns and meteorological phenomena.

  • Weather systems
  • Cold fronts
  • Occluded fronts
  • Meteorology
  • Climate

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  1. Cold Fronts A the atmosphere where an advancing cold, dry stable air mass displaces a warm, moist unstable subtropical air mass. On a weather map, the cold front is drawn as a solid blue line with triangles. The position of the triangles shows the direction of frontal movement. Cold fronts move between 15 to 50 kilometers per hour in a southeast to east direction. The formation of clouds and precipitation at the frontal zone is caused by frontal lifting. High altitude cirrus clouds are found well in advance of the front. Above the surface location of the cold front, high altitude cirrostratus and ltitude altocumulus are normally found just behind the front where frontal lifting has caused towering cumulus and cumulonimbus clouds# cold front is the transition zone in middle common. Precipitation is the development of

  2. Cold Fronts . . 50 . . . cirrostratus . . 15

  3. Contd

  4. Identification and Frontal Weather Weather Element Before Passage During Passage After Passage Temperature Warm Sharp drop Colder Winds South or southwest Variable and gusty West or northwest Precipitation None or showers Thunderstorms in summer, rain or snow in winter Clearing Clouds None, cumulus, or cumulonimbus Cumulonimbus None or cumulus in summer Pressure Falling then rising Rising Rising Humidity High, particularly in summer Dropping Low, particularly in winter

  5. Occluded Fronts

  6. . ) ( : ) .[ 2 ] ( : . .

  7. Occluded Front Helps to Generate a Mid-Latitude Cyclone when a cold front overtakes a warm front A developing cyclone typically has a preceding warm front (the leading edge of a warm moist air mass) and a faster moving cold front (the leading edge of a colder drier air mass wrapping around the storm). North of the warm front is a mass of cooler air that was in place before the storm even entered the region.

  8. Occluded Front Helps to Generate a Mid-Latitude Cyclone ) ( .) . (

  9. Types of Occlusion- Cold-Type Occluded Fronts During the formation of an occluded front, the Bergen meteorologists believed that if the polar air behind the cold front was colder (and thus denser) than the polar air ahead of the warm front, then this less dense air and the associated warm front would ride up off the ground over the cold front as the occluded front formed. This type of structure is called a cold-type occlusion.

  10. Types of Occlusion- Cold-Type Occluded Fronts . ) ( .

  11. Warm-Type Occluded Fronts A warm air occlusion or occluded front is less common than a cold occlusion. A warm occlusion occurs as cool air moves rapidly into an area with an existing warm front. The difference from a cold occlusion is that the approaching cool air is not as cold as the retreating cold air in the existing front. In other words, the fast-moving, incoming air is cold, but not as cold as the air mass ahead of it. Precipitation can usually be expected when an occluded front passes through an area.

  12. Warm-Type Occluded Fronts . . . . .

  13. Winds southeast-south variable west to northwest Temperature Cold Type Warm Type Pressure cold-cool cold dropping rising colder milder usually falling low point usually rising Ns, sometimes Tcu and Cb Clouds in order: Ci, Cs, As, Ns Ns, As or scattered Cu light, moderate or heavy continuous precipitation or showers light-to-moderate precipitation followed by general clearing light, moderate or heavy precipitation Precipitation Visibility poor in precipitation poor in precipitation improving usually slight drop, especially if cold- occluded slight drop, although may rise a bit if warm- occluded Dew Point steady

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