It is important that you have on hand all of the basic supplies you will need to survive. You should have enough of these supplies to be able to sustain yourself for at least three days, since it may be a while before you can evacuate safely or before help can reach you. A sample emergency kit might look like this:
Water, a gallon per person per day. Also, it is helpful to have some means of filtering/purifying water, in case you run out
Food, non-perishable (cans, protein bars- whatever won't go bad)
Battery-powered radio with extra batteries (or you can buy one of these)
NOAA weather radio with extra batteries (or, one of these will do the trick)
Flashlight with extra batteries
First aid kit
Whistle and signal mirror to signal for help
Surgical masks for breathing contaminated air
Plastic sheeting for building temporary shelters
Garbage bags and moist wipes for personal sanitation
Cell phone with charger/extra battery. By the by, this gem from the Red Cross has a NOAA radio, AM/FM radio, LED flashlight, and it will even charge your cell phone- all on hand crank power!
An extra supply of any prescription medications you may have
An analgesic such as Tylenol
Bedding such as sleeping bags
An extra change of clothes, including sturdy shoes
A waterproof means of starting a fire (waterproof matches, stormproof lighter, etc)
It is very important that your family have a plan before the storm hits. A good first step is to have an out-of-town emergency contact, as mentioned above. Another good step is to contact your local Office of Emergency Management to find out what your local emergency resources are. It could be that there's a specific rallying point for those who evacuate their homes, or that there's a local phone number to call to find out if you should evacuate. It's also important to know for yourself when you should evacuate and when you should stay where you are; you should come up with a set of conditions for each, so that the decision is much quicker and more clear when the disaster actually hits. Make sure that everyone in your family has a (or is with someone who has a) cell phone with SMS (texting) ability, because SMS can often make it through even when lines are too swamped for phone calls. Place your emergency contact as "ICE" (In Case of Emergency) in your cell phone; if you are incapacitated, emergency personnel will often look for that listing and call it. Above all, draft a family emergency plan before the storm, and make sure everyone has a copy when the storm hits.
Make sure that you have read up on all emergency procedures before the storm. Always pay attention to local weather and news reports, so that you aren't caught unawares. There are plenty of resources on the internet that you should read as soon as possible, and before a storm hits:
Ready.gov, a very helpful guide to being ready from the U.S. Dept of Homeland Security
Tropical Depression Two is slowly spinning west-northwest across Belize after making landfall late Monday afternoon in southern Belize. The storm is bringing heavy rain to Belize, Northern Guatemala, and Mexico's Yucatan Peninsula. The center of TD 2 will remain over land all day Tuesday, but TD 2's west-northwest track may be able to bring the storm over the Gulf of Mexico's southern Bay of Campeche on Wednesday--if the storm hasn't dissipated by then.