CBM CBM Synoptic Meteorology and Weather Systems 2

Question 1

What is a 'cutoff low' in synoptic meteorology?

Accepted Answer

An upper-level low separated from the main westerly flow

Answer

A cutoff low is an upper-level low-pressure cell that has been 'cut off' from the main jet stream flow and can persist for days, causing erratic surface weather.

Question 2

Which front type typically produces widespread, steady precipitation over a large area for an extended period?

Accepted Answer

Warm front

Answer

Warm fronts lift warm air gradually over retreating cold air, producing stratiform clouds and steady precipitation that can last many hours across a wide region.

Question 3

What is a 'blocking high' and its main forecasting impact?

Accepted Answer

A persistent anticyclone that deflects the jet stream and stalls weather patterns

Answer

A blocking high is a quasi-stationary anticyclone that disrupts normal westerly flow, forcing weather systems to divert and causing prolonged dry or stormy conditions in adjacent areas.

Question 4

Positive vorticity advection (PVA) at 500 mb is associated with which surface weather outcome?

Accepted Answer

Surface low development and upward motion

Answer

PVA at upper levels promotes divergence aloft, which drives surface convergence and upward motion, supporting surface low development and storm activity.

Question 5

The jet stream in the mid-latitudes is typically located at approximately what pressure level?

Accepted Answer

250 mb

Answer

The polar jet stream is typically strongest near the 250–300 mb level (roughly 35,000–39,000 feet), at the tropopause boundary.

CBM - Certified Broadcast Meteorologist Practice Test

CBM - Certified Broadcast Meteorologist Practice Test

CBM CBM Synoptic Meteorology and Weather Systems 2