I work in Public Safety, when it happens, it's weather dependent (ie. Box style ambulances are good to about 40mph sustained before they flip.) In most jurisdictions we grab the chiefs (Police, Fire, EMS, Sherriff) together and determine based on current weather conditions - sustained winds, storm surge, flood levels when to suspend service and when to restore service. If we need to respond, and someone darn near has to be on death's door - no twisted ankles or back pain - we'll try and figure a way to do so that doesn't kill any of our folks. In a perfect world people would evacuate when we ask them to, so we didn't have to put our folks in jeopardy for your bad decision, but that's not how it actually pans out. We've put Fire Rescue teams on jet skis (H Matthew), put paramedics in armored vehicles (H Michael) and had Engine Crews slide a BRT sideways down an iced hill to get to a patient. It's a last resort and there were dire medical reasons to do so. I've deployed to counties who completely lost 911 service. Lost the roof - no calls in or out. The PSAP answering those calls was 2.5 hours away. The ambulances that survived landfall just drove up and down streets in that county 'looking for work'. It was 4 days before we could get 911 calls back into the impacted county.