That Somalia's arid climate is influenced by regional meteorological and geographical conditions is a matter of basic geographic and climatological observation, requiring no citation of specific papers.
The claim states that Somalia's arid climate is caused by specific meteorological and geographical factors. This is a matter of everyday geographical observation and well-established textbook science (arid climates are defined by specific atmospheric circulation, pressure gradients, and geography). Following STEP 0, trivial facts or basic geographical truisms are classified as COMMON_KNOWLEDGE, and no citation of papers is required.