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Click on the Layers menu in the bottom right of the radar to select radar options like Current Conditions, Storm Tracks and Feels Like Temps. Also get information on current severe weather watches and warnings in your area. Zoom in to your street or out to your region and view past and futurecast radar.
Sign up to receive email alerts when severe weather happens in your area. You can also view current severe weather warnings & watches for Des Moines and Iowa on the KCCI alerts page. Check the latest weather conditions, get location-specific push alerts & view our Interactive Radar at any time with the KCCI app.
Sign up to receive email alerts when severe weather happens in your area. You can also view current severe weather warnings & watches for Orlando on the WESH 2 alerts page. Check the latest weather conditions, get location-specific push alerts on your phone & view our Interactive Radar at any time with the WESH 2 News app.
Tonight, the first of many weather changes arrives. A cold front will sweep through, with the main impacts being gusty winds. In fact, by Friday morning, gusts of up to 50 mph will be possible. You'll want to secure any loose outdoor items. Winds subside Friday afternoon. Temperatures will be cooler on Friday, with highs only reaching to near 60. Additionally, gusty winds may help to kick up Mountain Cedar.
Some weak upper level energy may be just enough to kick off some very light precipitation Sunday night. Wintry weather is possible, but the window is small and we don't expect much if any accumulation at this time.
Sign up to receive email alerts when severe weather happens in your area. You can also view current severe weather warnings and watches for Omaha and Eastern Nebraska on the KETV NewsWatch 7 alerts page. And stay on top of the weather conditions and view KETV's Interactive Radar anytime with the KETV app for iPhone and Android.
Sign up to receive email alerts when severe weather happens in your area. You can also view current severe weather warnings & watches for Sacramento and Northern California on the KCRA alerts page. Check the latest weather conditions, get location-specific push alerts & view our Interactive Radar at any time with the KCRA app.
Sign up to receive email alerts when severe weather happens in your area. You can also view current severe weather warnings & watches for Oklahoma City on the KOCO 5 alerts page. Check the latest weather conditions, get location-specific push alerts & view our Interactive Radar at any time with the KOCO 5 News app.
Sign up to receive email alerts when severe weather happens in your area. You can also view current severe weather warnings & watches for Louisville on the WLKY weather alerts page. Check the latest weather conditions, get location-specific push alerts on your phone & view our Interactive Radar at any time with the WLKY News app.
Get Louisville news and weather from WLKY News. Watch live weekdays at 4:30am, 5am, 6am, 7am, 12pm, 5pm, 5:30pm, 6pm, 10pm and 11pm. Watch live Saturdays at 5am, 6am, 7am, 6pm and 11pm. Watch live Sundays at 5am, 6am, 7am, 8am, 6:30pm, and 11pm.
Sign up to receive email alerts when severe weather happens in your area. You can also view current severe weather warnings & watches for Pittsburgh on the WTAE alerts page. Check the latest weather conditions, get location-specific push alerts on your phone & view our Interactive Radar at any time with the WTAE Pittsburgh's Action News 4 app.
Sign up to receive email alerts when severe weather happens in your area. You can also view current severe weather warnings & watches for Milwaukee on the WISN alerts page. Check the latest weather conditions, get location-specific push alerts on your phone & view our Interactive Radar at any time with the WISN 12 News app.
Sign up to receive email alerts when severe weather happens in your area. You can also view current severe weather warnings & watches for Manchester and surrounding areas on the WMUR alerts page. Check the latest weather conditions, get location-specific push alerts on your phone & view our Interactive Radar at any time with the WMUR News 9 app.
Sign up to receive email alerts when severe weather happens in your area. You can also view current severe weather warnings & watches for Greenville on the WYFF 4 alerts page. Check the latest weather conditions, get location-specific push alerts on your phone & view our Interactive Radar at any time with the WYFF News 4 app.
Weather radar, also called weather surveillance radar (WSR) and Doppler weather radar, is a type of radar used to locate precipitation, calculate its motion, and estimate its type (rain, snow, hail etc.). Modern weather radars are mostly pulse-Doppler radars, capable of detecting the motion of rain droplets in addition to the intensity of the precipitation. Both types of data can be analyzed to determine the structure of storms and their potential to cause severe weather.
During World War II, radar operators discovered that weather was causing echoes on their screens, masking potential enemy targets. Techniques were developed to filter them, but scientists began to study the phenomenon. Soon after the war, surplus radars were used to detect precipitation. Since then, weather radar has evolved and is used by national weather services, research departments in universities, and in television stations' weather departments. Raw images are routinely processed by specialized software to make short term forecasts of future positions and intensities of rain, snow, hail, and other weather phenomena. Radar output is even incorporated into numerical weather prediction models to improve analyses and forecasts.
During World War II, military radar operators noticed noise in returned echoes due to rain, snow, and sleet. After the war, military scientists returned to civilian life or continued in the Armed Forces and pursued their work in developing a use for those echoes. In the United States, David Atlas[1] at first working for the Air Force and later for MIT, developed the first operational weather radars. In Canada, J.S. Marshall and R.H. Douglas formed the "Stormy Weather Group" in Montreal.[2][3] Marshall and his doctoral student Walter Palmer are well known for their work on the drop size distribution in mid-latitude rain that led to understanding of the Z-R relation, which correlates a given radar reflectivity with the rate at which rainwater is falling. In the United Kingdom, research continued to study the radar echo patterns and weather elements such as stratiform rain and convective clouds, and experiments were done to evaluate the potential of different wavelengths from 1 to 10 centimeters. By 1950 the UK company EKCO was demonstrating its airborne 'cloud and collision warning search radar equipment'.[4]
Between 1950 and 1980, reflectivity radars, which measure the position and intensity of precipitation, were incorporated by weather services around the world. The early meteorologists had to watch a cathode ray tube. In 1953 Donald Staggs, an electrical engineer working for the Illinois State Water Survey, made the first recorded radar observation of a "hook echo" associated with a tornadic thunderstorm.[5]
The first use of weather radar on television in the United States was in September 1961. As Hurricane Carla was approaching the state of Texas, local reporter Dan Rather, suspecting the hurricane was very large, took a trip to the U.S. Weather Bureau WSR-57 radar site in Galveston in order to get an idea of the size of the storm. He convinced the bureau staff to let him broadcast live from their office and asked a meteorologist to draw him a rough outline of the Gulf of Mexico on a transparent sheet of plastic. During the broadcast, he held that transparent overlay over the computer's black-and-white radar display to give his audience a sense both of Carla's size and of the location of the storm's eye. This made Rather a national name and his report helped in the alerted population accepting the evacuation of an estimated 350,000 people by the authorities, which was the largest evacuation in US history at that time. Just 46 people were killed thanks to the warning and it was estimated that the evacuation saved several thousand lives, as the smaller 1900 Galveston hurricane had killed an estimated 6000-12000 people.[6]
During the 1970s, radars began to be standardized and organized into networks. The first devices to capture radar images were developed. The number of scanned angles was increased to get a three-dimensional view of the precipitation, so that horizontal cross-sections (CAPPI) and vertical cross-sections could be performed. Studies of the organization of thunderstorms were then possible for the Alberta Hail Project in Canada and National Severe Storms Laboratory (NSSL) in the US in particular.
Between 1980 and 2000, weather radar networks became the norm in North America, Europe, Japan and other developed countries. Conventional radars were replaced by Doppler radars, which in addition to position and intensity could track the relative velocity of the particles in the air. In the United States, the construction of a network consisting of 10 cm radars, called NEXRAD or WSR-88D (Weather Surveillance Radar 1988 Doppler), was started in 1988 following NSSL's research.[7][8] In Canada, Environment Canada constructed the King City station,[9] with a 5 cm research Doppler radar, by 1985; McGill University dopplerized its radar (J. S. Marshall Radar Observatory) in 1993. This led to a complete Canadian Doppler network[10] between 1998 and 2004. France and other European countries had switched to Doppler networks by the early 2000s. Meanwhile, rapid advances in computer technology led to algorithms to detect signs of severe weather, and many applications for media outlets and researchers.
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