May 16 (Reuters) - A look at the day ahead in Asian markets from Jamie McGeever. A barrage of Chinese economic data on Tuesday will give investors a clearer picture of whether their growing fears over the health of Asia's largest economy lately are justified. If the April snapshots of retail sales, urban investment and industrial production come in weaker than expected - and consensus forecasts are for solid rebounds from the month before - the China bears and doomsters will be in the ascendancy. Broader market sentiment may be reasonably well supported after Wall Street eked out modest gains...