Since hail can cause the rainfall estimates to be higher than what is actually occurring, steps are taken to prevent these high dBZ values from being converted to rainfall. If you’re out around dinnertime and beyond, have a way to receive weather alerts and keep an eye on radar as strong storms. Hail is a good reflector of energy and will return very high dBZ values. Most of Saturday will be quiet in Houston. ABC13 HURRICANE GUIDE The ABC13 Weather Team prepares you for the 2023 hurricane season Watch Live ON NOW View every corner across the Houston area Live traffic conditions on Houston freeways. These values are estimates of the rainfall per hour, updated each volume scan, with rainfall accumulated over time. Depending on the type of weather occurring and the area of the U.S., forecasters use a set of rainrates which are associated to the dBZ values. The higher the dBZ, the stronger the rainrate. Typically, light rain is occurring when the dBZ value reaches 20. Some clouds this morning will give way to generally sunny skies for the afternoon. The scale of dBZ values is also related to the intensity of rainfall. The value of the dBZ depends upon the mode the radar is in at the time the image was created. Notice the color on each scale remains the same in both operational modes, only the values change. ![]() The other scale (near left) represents dBZ values when the radar is in precipitation mode (dBZ values from 5 to 75). Houston, TX Weather Forecast, Radar, Severe Alerts - Weather forecast for Houston, Texas, LIVE radar, satellite, hour by hour forecasts- The only morning. ![]() One scale (far left) represents dBZ values when the radar is in clear air mode (dBZ values from -28 to +28). Each reflectivity image you see includes one of two color scales. So far at least, our temperatures seem to be underachieving a bit. The dBZ values increase as the strength of the signal returned to the radar increases. On Monday, Houston topped off around 95, after a 94 on Sunday and 93 on Saturday. So, a more convenient number for calculations and comparison, a decibel (or logarithmic) scale (dBZ), is used. Reflectivity (designated by the letter Z) covers a wide range of signals (from very weak to very strong). "Reflectivity" is the amount of transmitted power returned to the radar receiver. ![]() The colors are the different echo intensities (reflectivity) measured in dBZ (decibels of Z) during each elevation scan.
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