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2. Philadelphia, PA Weather - Hourly Forecasts and Local ... - AOL

   www.aol.com/weather/forecast/us/philadelphia

   Get the Philadelphia, PA local weather forecast by the hour and the next 10 days.

3. Philadelphia, PA Weather - Hourly Forecasts and Local ... - AOL

   www.aol.com/weather/forecast/us/philadelphia...

   Get the Philadelphia, PA local weather forecast by the hour and the next 10 days. Skip to main content. Sign in. Mail. 24/7 Help. For premium support please call: 800-290-4726 more ways to ...

4. Philadelphia, PA Weather - Hourly Forecasts and Local ... - AOL

   www.aol.com/weather/forecast/us/philadelphia...

   Get the Philadelphia, PA local weather forecast by the hour and the next 10 days. ... In the harrowing live video from Freddy McKinney, he yells at the family to "Hurry, get inside!" as they run ...

5. Philadelphia, PA Weather - Hourly Forecasts and Local ... - AOL

   www.aol.com/weather/forecast/us/philadelphia...

   Get the Philadelphia, PA local weather forecast by the hour and the next 10 days. ... Central U.S. braces for 'significant' tornado outbreak amid dire warnings: Live updates.

6. Philadelphia, PA Weather - Hourly Forecasts and Local ... - AOL

   www.aol.com/weather/forecast/us/philadelphia...

   Get the Philadelphia, PA local weather forecast by the hour and the next 10 days. ... When the rain starts to fall, people immediately look to the weather radar to see how long it will last. But ...

7. Weather radar - Wikipedia

   en.wikipedia.org/wiki/Weather_radar

   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 ...

8. Doppler radar - Wikipedia

   en.wikipedia.org/wiki/Doppler_radar

   Doppler effect. The emitted signal toward the car is reflected back with a variation of frequency that depends on the speed away/toward the radar (160 km/h). This is only a component of the real speed (170 km/h). The Doppler effect (or Doppler shift), named after Austrian physicist Christian Doppler who proposed it in 1842, is the difference ...

9. Weather Underground (weather service) - Wikipedia

   en.wikipedia.org/wiki/Weather_Underground...

   Weather Underground is a commercial weather service providing real-time weather information over the Internet. It provides weather reports for most major cities around the world on its Web site, as well as local weather reports for newspapers and third-party sites. Its information comes from the National Weather Service (NWS), and over 250,000 ...