The 2003 Blackout caused a spike in respiratory hospitalizations, exceeding the upper range of predictions...

Respiratory hospitalizations: Predicted and Observed.

When the power outage happened on August 14, 2003, observed respiratory hospitalizations exceeded the predicted hospitalizations significantly, reaching 252 on August 14, and 182 on August 15 before full power was restored. Predictions for these dates had been 61 and 58, respectively.