Question 1

What sequence of cloud types typically precedes the arrival of a warm front?

Accepted Answer

Cirrus → cirrostratus → altostratus → nimbostratus. As a warm front approaches (Northern Hemisphere), the cloud sequence from first signs to front arrival is: Cirrus (wispy, high) → Cirrostratus (halo around sun/moon) → Altostratus (grey veil, sun visible) → Nimbostratus (thick, continuous rain). The warm front is typically preceded by 12-24 hours of deteriorating weather, steady rain, falling pressure.

Question 2

As a cold front passes, which combination of weather changes is most typical in the Northern Hemisphere?

Accepted Answer

Pressure rises sharply, temperature falls, wind veers suddenly, with heavy squalls followed by clearance.. Cold front passage in Northern Hemisphere: BEFORE, pressure falling, warm sector, SW wind. AT FRONT, sudden veer (often SW to W or NW), temperature drops sharply, heavy rain or thundery squalls, possible waterspout. AFTER, pressure rises rapidly, temperature falls, wind NW, good visibility with shower clouds (cumulonimbus), clearing weather.

Question 3

What is an occluded front?

Accepted Answer

A front formed when a cold front catches a warm front, lifting the warm sector off the ground.. Occlusion occurs when a cold front catches up with a warm front, lifting the warm sector off the ground. A cold occlusion occurs when the air behind the cold front is colder than the air ahead of the warm front and undercuts it. A warm occlusion occurs when the air ahead of the warm front is colder than the air behind the cold front, so the air behind the cold front rides up over it. In both cases, the warm sector is lifted from the surface.

Frontal Systems, questions and explanations

What sequence of cloud types typically precedes the arrival of a warm front?

As a cold front passes, which combination of weather changes is most typical in the Northern Hemisphere?

What is an occluded front?

Practise this properly

Frontal Systems, questions and explanations

Questions

What sequence of cloud types typically precedes the arrival of a warm front?

As a cold front passes, which combination of weather changes is most typical in the Northern Hemisphere?

What is an occluded front?

Practise this properly