Elgin Doppler Radar Loop
The colors are the different echo intensities (reflectivity) measured in dBZ (decibels of Z) during each elevation scan. "Reflectivity" is the amount of transmitted power returned to the radar receiver. Reflectivity (designated by the letter Z) covers a wide range of signals (from very weak to very strong). So, a more convenient number for calculations and comparison, a decibel (or logarithmic) scale (dBZ), is used.
The dBZ values increase as the strength of the signal returned to the radar increases. Each reflectivity image you see includes one of two color scales. One scale (far left) represents dBZ values when the radar is in clear air mode (dBZ values from -28 to +28). The other scale (near left) represents dBZ values when the radar is in precipitation mode (dBZ values from 5 to 75). Notice the color on each scale remains the same in both operational modes, only the values change. The value of the dBZ depends upon the mode the radar is in at the time the image was created.
The scale of dBZ values is also related to the intensity of rainfall. Typically, light rain is occurring when the dBZ value reaches 20. The higher the dBZ, the stronger the rainrate. 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.
These values are estimates of the rainfall per hour, updated each volume scan, with rainfall accumulated over time. Hail is a good reflector of energy and will return very high dBZ values. 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.
The time period when the sun is no more than 6 degrees below the horizon at either sunrise or sunset. The horizon should be clearly defined and the brightest stars should be visible under good atmospheric conditions (i.e. no moonlight, or other lights). One still should be able to carry on ordinary outdoor activities.
The time period when the sun is between 6 and 12 degrees below the horizon at either sunrise or sunset. The horizon is well defined and the outline of objects might be visible without artificial light. Ordinary outdoor activities are not possible at this time without extra illumination.
The time period when the sun is between 12 and 18 degrees below the horizon at either sunrise or sunset. The sun does not contribute to the illumination of the sky before this time in the morning, or after this time in the evening. In the beginning of morning astronomical twilight and at the end of astronomical twilight in the evening, sky illumination is very faint, and might be undetectable.
The time of Civil Sunset minus the time of Civil Sunrise.
The time of Actual Sunset minus the time of Actual Sunrise. The change in length of daylight between today and tomorrow is also listed when available.
Strong Storm System Impacting the High Plains; Flash Flooding Possible in portions of Texas and Oklahoma
A slight chance of showers before 2pm, then a chance of showers and thunderstorms between 2pm and 3pm, then showers likely and possibly a thunderstorm after 3pm. Mostly cloudy, with a high near 71. South southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 60. South southeast wind 10 to 15 mph becoming southwest after midnight. Winds could gust as high as 20 mph.
A chance of showers and thunderstorms before 8am, then a slight chance of showers after 2pm. Mostly cloudy, with a high near 68. West southwest wind 5 to 10 mph. Chance of precipitation is 30%.
A 40 percent chance of showers, mainly after 8pm. Mostly cloudy, with a low around 51. Southwest wind around 5 mph becoming calm in the evening.
A 50 percent chance of showers. Mostly cloudy, with a high near 62. Calm wind becoming north northwest around 5 mph in the afternoon. Winds could gust as high as 10 mph.
A 40 percent chance of showers before 8pm. Mostly cloudy, with a low around 42.
Sunny, with a high near 59.
Clear, with a low around 42.
Sunny, with a high near 64.
Mostly clear, with a low around 43.
Sunny, with a high near 67.
Mostly clear, with a low around 49.
Mostly sunny, with a high near 66.
Radar elgin weather
.Weather Radar Aviation - [How Can You Use The Weather Radar During The Cruise].
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