Question

Explain why, even with computer models and data, weather predictions can be incorrect. Use complete sentences.





Question 8 (Essay Worth 5 points)
(03.06 HC)

Explain how a hurricane poses a threat to life and the biosphere. Use complete sentences.

Answer 1

Weather predictions can be incorrect even with advanced computer models and large amounts of data because the atmosphere is a chaotic system that is extremely sensitive to small errors in initial conditions. Observations are still incomplete in space and time—especially over oceans and remote regions—so models must start from imperfect information. Models also use approximations and parameterizations for small-scale processes such as cloud formation, turbulence, and convection that cannot be resolved directly at practical computational resolution. Numerical errors and limits on computational power force forecasters to simplify or truncate calculations, which introduces additional inaccuracies. Data assimilation methods that combine observations with model states can reduce but not eliminate discrepancies between the model’s representation and the real atmosphere. Finally, local or rapidly developing phenomena can occur that were not captured by earlier observations or model forecasts, so even a good model can miss or misplace significant weather events.

A hurricane poses a threat to human life and to the biosphere through several direct and indirect mechanisms. The hurricane’s high winds can destroy buildings, topple trees and power lines, and turn debris into deadly projectiles, causing injury and death. Storm surge and coastal flooding can inundate communities, drown people and animals, erode shorelines, and push saltwater into freshwater ecosystems and groundwater supplies. Heavy rainfall can produce inland flooding and landslides, contaminate drinking water, and spread waterborne diseases. Habitat destruction from wind, flood, and wave action can kill or displace wildlife, damage forests, wetlands, and coral reefs, and disrupt food webs and breeding grounds. In addition, flooding and runoff can carry pollutants and nutrients into ecosystems, causing long-term changes in water quality and biological communities. Secondary effects such as prolonged power outages, disruption of medical services, food shortages, and human displacement further increase risks to life and reduce the capacity of societies and ecosystems to recover.