What are Fronts and its type ?

Front is the transition zone between air masses with distinctly different properties.

The differences in density are most often caused by temperature differences. Separate air masses with different humidities as well. We identify fronts by the movement of this transition zone and the properties that move over a geographical location.

How do you identify a front on a surface weather map or by your own weather observations? Look for:

  1. Sharp temperature changes over a relatively short distance
  2. Change in moisture content
  3. Rapid shifts in wind direction
  4. Pressure changes
  5. Clouds and precipitation patterns
Types of Fronts:

MGA24A stationary front is characterized by no movement of the transition zone between two air masses.

 

MGA25A cold front is cold air displacing warm air.

Steep leading edge — friction slows surface advance, moves quickly–25 knts up to 40 knts faster=steeper

General weather characteristics of a Cold Front Weather Feature                                          Before Frontal  Passage           Region of Front         After Frontal Passage                                Winds            S-SW                                 gusty                  W-NW                                                                  Temperature    Warm                   Sudden decrease        Steady Cooling                                          Dew Point      high; remains steady      Steady                 Decreases                                                Pressure       Falling steadily       Minimum; rapid rise    steady rise                                          Visibility     Fair to Poor               Poor then improving    good                                                        Clouds         Ci, Cs Cb                      Cb                                    Cu                                                    Precipitation  showers                heavy precip.                   clearing

MGA28 warm front is warm air displacing cool air diagram. Shallow leading edge warm air must “overrun” cold air–cold air recedes moves slow 10-15 knts.

MGA26There are two kinds of occluded fronts

Cold occlusion-cold front catches up with warm front. Ns, Tcu, Cb warm very cold .

Warm occlusion mostly in NW. Warm cool mP off ocean cold cP warm occlusion.-+

Precipitation is similar to the cold occlusion.                

manish-mayank

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