The test Testing was a simulation of an electrical power outage to aid Assistance the development of a safety procedure for maintaining cooling water circulation until the back-up generators could provide Supply power .

A tropical depression formed Coming_to_be on December 21 , when a low-level circulation center began Process_start to produce Creating deep convection .

While moving Motion southeastward , it developed Coming_to_be an organized area of convection over the center of circulation .

With its circulation intact and still a tropical storm Catastrophe , Kathleen headed Self_motion north into the United States and affected Influence California and Arizona .

Despite the shear , the storm maintained Preserving a well-defined wind circulation for several days , with intermittent bursts of thunderstorms near its center .

However , due Causation to its acceleration to the west-northwest , Colin was unable to maintain Preserving a closed circulation and subsequently degenerated Change into a trough later that day .

Gale-force winds covered Hiding_objects the far northern Atlantic between Western Europe and Atlantic Canada , due Causation to the intensity of this storm Catastrophe , with hurricane-force winds confined Hindering near its center of circulation .

Its remnant low was absorbed by Hurricane Wilma 's large circulation .

After uneventfully crossing Motion_directional the Atlantic Ocean , the system developed Coming_to_be a well-defined circulation while in the Caribbean Sea on September 20 and was then classified Check as a tropical depression .

Health officials in Bangladesh confirmed Check a deadly outbreak of diarrhoea on 29 Formation Alert being issued Statement early the next day by the JTWC as the low level circulation center had become Becoming stronger and more defined .

During its trek across the eastern Caribbean Sea , its circulation became Becoming severely disrupted and it may have degenerated Change into a tropical wave .

The storm Catastrophe lost Earnings_and_losses its circulation and became Becoming a tropical wave on August 12 .

The next day the remnant circulation of Epsilon dissipated Dispersal .

Finally , by January 9 , Ron was absorbed Control by the much larger circulation of Severe Tropical Cyclone Susan .

The extratropical remnants weakened Cause_change_of_strength gradually overland , and the center of circulation was declared Expressing_publicly indistinguishable over western Pennsylvania two days later .

Shortly thereafter , the storm struck Attack southeastern Vietnam , and its circulation dissipated Cause_change_of_strength on November 15 .

On April 23 , Alan appeared Presence to become Becoming sheared Body_movement with the low-level circulation center displaced about from the nearest atmospheric convection .

However , strong wind shear pulled Motion the system apart , with visible imagery confirming the system 's degeneration into a depression with a fully exposed low-level circulation .

By July 11 , it had become Becoming sufficiently organized Cause_change_of_position_on_a_scale to be declared Expressing_publicly a tropical depression , although the cyclone 's circulation remained Presence broad .

Convection Motion increased as the circulation became Becoming better defined , and by early on September 2 it became Becoming a tropical storm Catastrophe .

After moving Motion across mountainous terrain in Central America , the surface circulation of Mitch dissipated Dispersal on November 1 .

However , upon emergence into the western Caribbean Sea , it was once again designated Choosing as a tropical depression after a well-defined circulation was observed Perception_active on satellite imagery .