Bell County Rainfall Maps

The Bell County rainfall maps information is provided by NOAA (National Oceanic and Atmospheric Administration) and utilizes Next Generation Radar (NEXRAD). NEXRAD obtains weather information (precipitation and wind) based upon returned energy. The radar emits a burst of energy (green). If the energy strikes an object (rain drop, bug, bird, etc), the energy is scattered in all directions (blue). A small fraction of that scattered energy is directed back toward the radar.

This reflected signal is then received by the radar during its listening period. Computers analyze the strength of the returned pulse, time it took to travel to the object and back, and phase shift of the pulse. This process of emitting a signal, listening for any returned signal, then emitting the next signal, takes place very fast, up to around 1300 times each second.
NEXRAD spends the vast amount of time “listening” for returning signals it sent. When the time of all the pulses each hour are totaled (the time the radar is actually transmitting), the radar is “on” for about 7 seconds each hour. The remaining 59 minutes and 53 seconds are spent listening for any returned signals.

The ability to detect the “shift in the phase” of the pulse of energy makes NEXRAD a Doppler radar. The phase of the returning signal typically changes based upon the motion of the raindrops (or bugs, dust, etc.). This Doppler effect was named after the Austrian physicist, Christian Doppler, who discovered it. You have most likely experienced the “Doppler effect” around trains.

As a train passes your location, you may have noticed the pitch in the train’s whistle changing from high to low. As the train approaches, the sound waves that make up the whistle are compressed making the pitch higher than if the train was stationary. Likewise, as the train moves away from you, the sound waves are stretched, lowering the pitch of the whistle. The faster the train moves, the greater the change in the whistle’s pitch as it passes your location.

The same effect takes place in the atmosphere as a pulse of energy from NEXRAD strikes an object and is reflected back toward the radar. The radar’s computers measure the phase change of the reflected pulse of energy which then convert that change to a velocity of the object, either toward or from the radar. Information on the movement of objects either toward or away from the radar can be used to estimate the speed of the wind. This ability to “see” the wind is what enables the National Weather Service to detect the formation of tornados which, in turn, allows us to issue tornado warnings with more advanced notice.

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2013 Bell County Rainfall Maps

September 2013
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

August 2013
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

July 2013
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

June 2013
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

May 2013
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

April 2013
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

March 2013
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

February 2013
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

January 2013
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall


2012 Bell County Rainfall Maps

December 2012
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

November 2012
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

October 2012
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

September 2012
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

August 2012
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

July 2012
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

June 2012
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

May 2012
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

April 2012
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

March 2012
Bell County Monthly Rainfall

February 2012
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

January 2012
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

2011 Bell County Rainfall Maps

December 2011
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

November 2011
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

October 2011
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

September 2011
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

August 2011
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

July 2011
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

June 2011
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

May 2011
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

April 2011
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

March 2011
Bell County Monthly Rainfall

February 2011
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall

January 2011
Bell County Monthly Rainfall
Bell County Year-to-Date Rainfall


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