Fujiwara Effect

                                                                     Fujiwara Effect

Satellite image of Fujiwara effect wherein you can see two
  cyclones just like orbiting each other

                    I learned that Fujiwhara effect, named after Sakuhei Fujiwhara, is a type of interaction between two nearby cyclonic vortices, causing them to appear to "orbit" each other.When the cyclones approach each other, their centers will begin orbiting cyclonically about a point between the two systems due to their cyclonic wind circulations. The two vortices will be attracted to each other, and eventually spiral into the center point and merge. When the two vortices are of unequal size, the larger vortex will tend to dominate the interaction, and the smaller vortex will orbit around it. The effect is often mentioned in relation to the motion of tropical cyclones, although the final merging of the two storms is uncommon. The effect becomes pronounced in these storms when they approach within about 1,500 km (900 mi) of each other and are at tropical storm strength or stronger.

                   I want to know more about the other possible reactions of two normal cyclones whether would it be possible for them not to combine and if that happens what would be the possible factors that affected such reaction. Moreover, I also want to know if only two cyclones are involved and what would be the possible result if these two cyclone have opposite direction of movement, would they still pull each other for them to combine?

                 I appreciate the fact that changes in the atmospheric pressure is one of the many factors that builds or constructs this phenomenon.

                I can apply my learnings and insights in being prepared in case these weather system occurs.

Storm Signals

                                             Public Storm Warning Signals #1 #2 #3 and #4

                    I learned that warnings and watches are two levels of alert issued by national weather forecasting bodies to coastal areas threatened by the imminent approach of a tropical cyclone of tropical storm or hurricane intensity. They are notices to the local population and civil authorities to make appropriate preparation for the cyclone, including evacuation of vulnerable areas where necessary. It is important that interests throughout the area of an alert make preparations to protect life and property, and do not disregard it on the strength of the detailed forecast track.
                         The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) releases tropical cyclone warnings in the form of Public Storm Warning Signals (PSWS) . An area having a storm signal may be under:

• PSWS #1 - Tropical cyclone winds of 30-60 km/h are expected within the next 36 hours. (Note: If a tropical cyclone forms very close to the area, then a shorter lead time is seen on the warning bulletin.)
• PSWS #2 - Tropical cyclone winds of 60-100 km/h are expected within the next 24 hours.
• PSWS #3 - Tropical cyclone winds of 100-185 km/h are expected within the next 18 hours.
• PSWS #4 - Tropical cyclone winds of greater than 185 km/h are expected within 12 hours.

                  I want to know more about the results of having these storm warning signals and does it have a great effect on the preparatory methods of local citizens against the risk of having accidents due to violent storms.

                 I appreciate the fact that PAGASA had done a very good decision in constructing these public storm warning signals.

                 I can apply my learnings and insights as my background knowledge in case I need to be a weather forecaster someday.