Flood Alerts, Terminology & Safety

Real-Time Flood Information 

Monitor rainfall and stream levels in real time, and sign up for alerts from the Harris County Flood Control District.

Flood Alerts

In the event of severe weather, the radio and television stations below may provide up-to-date weather information.

Additionally, several websites are available for up to the minute storm tracking.

The City of Nassau Bay provides Emergency Alert Notifications to anyone who wishes to register.

Flood Alert Terminology

Flood Advisory:
The mildest level of a flood notification. Flooding may be possible due to problematic weather, but will be less than severe if it occurs.

Flood Watch:
Issued before a flood warning. Indicates that flooding is possible within the next 24 to 48 hours. While a flood watch does not mean flooding will likely occur, the conditions are favorable for a flood.

Flood Warning:
Flooding is imminent or is already happening. Avoid low lying areas. Monitor radio or TV stations to obtain weather updates. If local officials advise you to evacuate, do so immediately. Nassau Bay residents are encouraged to use the official evacuation route, NASA Parkway to I45.

Flash Flood Warning:
Sudden violent floods that occur quickly, usually in six hours or less, when it rains heavily or when levees and dams break. Densely populated areas, such as cities, are at a high risk for flash floods. Seek higher ground immediately.

Flood Safety

  • Do not walk through water. Currents can be deceptive; 2 feet of moving water can knock you off your feet. If you must walk in standing water, use a pole or stick to ensure the ground has not washed away.
  • Do not drive through water or around road barriers. The average automobile can be swept off the road in 12 inches of moving water, and roads covered by water are prone to collapse. If you come upon a flooded street, take an alternate route. Don’t drown. Turn around!
  • Stay away from power lines and electrical wires. Report downed power lines to CenterPoint Energy at 713-207-2222.
  • Shut power off at the breaker. Some appliances, such as televisions and computers, may keep electrical charges even after they have been unplugged.
  • Help is available for citizens with hearing, speech or mobility impairment, critical illness, special dietary needs and/or lack of transportation. Please call 211, the State Transportation Evacuation Assistance Registry, to register for assistance.