the storm 's eyewall reached the chain of islands sunday .
the national weather service reported wind gusts of 90 mph ( 145 kph ) near its key west office .
the northern eyewall of the storm reached the island chain early sunday , the pasco county sheriff 's office asked the thousands of people who had shared the page to also share their request for volunteers needed at hurricane shelters .
petersburg , fla. ( ap ) — the latest on hurricane irma ( all times local ) : 8:20 a.m. florida authorities have issued another stern warning about hurricane irma : shooting bullets into the storm wo n't help keep you safe .
authorities are urging people who chose to ride out hurricane irma in the florida keys to remain indoors until the storm passes .
the national weather service reported wind gusts of 90 mph ( 13 kph ) near its key west office .
the sheriff 's office , which is being used as a fallout shelter , in advance of hurricane irma , in estero , fla. , saturday , sept. 9 , 2017 .
forecasters say hurricane irma 's center is poised to blow across the florida keys .
in a facebook post early sunday , key west police urged people who stayed for the hurricane to remain where they took shelter until the storm had passed completely .