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Weather Map
NWS Radar Map for New Jersey



Pequannock River - Macopin Intake Dam, West Milford, NJ, USGS Current Data at
Height: feet Flow: ft3/sec Temperature:°C (32°F)

rt23.com Weather Station
Morristown Municipal, NJ, United States (KMMU) 40-48N 074-25W
Apr 27, 2017 - 06:45 AM EDT / 2017.04.27 1045 UTC
Wind: Calm
Visibility: 2 mile(s)
Sky conditions: overcast
Weather: mist
Temperature: 57 F (14 C)
Dew Point: 57 F (14 C)
Relative Humidity: 100%
Pressure (altimeter): 29.89 in. Hg (1012 hPa)
updated: 525 AM EDT Thu Apr 27 2017
  Mostly cloudy. Patchy drizzle early. Areas of fog early.  Highs around 70. Light and variable winds, becoming south 5 to  10 mph.
  Mostly cloudy with a chance of showers. Patchy drizzle  in the evening, then a slight chance of thunderstorms after  midnight. Areas of fog. Lows in the mid 50s. Southeast winds 5 to  10 mph. Chance of rain 30 percent.
  Patchy fog in the morning. Mostly cloudy with a chance  of showers with a slight chance of thunderstorms in the morning,  then mostly sunny in the afternoon. Highs in the upper 70s. West  winds around 5 mph. Chance of rain 30 percent.
  Partly cloudy in the evening, then becoming  mostly cloudy. Lows in the upper 50s. South winds around 5 mph.
  Mostly cloudy with a slight chance of showers and  thunderstorms. Highs around 80. Southwest winds 5 to 10 mph,  becoming west with gusts up to 20 mph in the afternoon. Chance of  rain 20 percent.
  Mostly cloudy. Lows in the lower 50s.
  Partly sunny. Cooler with highs in the mid 60s.
  Mostly cloudy. A chance of showers after  midnight. Lows around 50. Chance of rain 40 percent.
  Mostly cloudy with a chance of showers. Highs in the  lower 70s. Chance of rain 40 percent.
  Mostly cloudy. Showers likely, mainly in the  evening. Lows in the upper 50s. Chance of rain 60 percent.
  Mostly sunny. Highs in the upper 60s.
  Partly cloudy in the evening, then clearing.  Lows in the mid 40s.
  Mostly sunny. Highs in the mid 60s.

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Doppler Radar Map for New Jersey

This is the latest Doppler Radar Map for New Jersey from the National Weather Service. This image is generated at the National Weather Service's Mount Holly, New Jersey station by NEXRAD.

NEXRAD (Next Generation Radar) 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 them to issue tornado warnings with more advanced notice.

Astronomy Doppler Radar Map


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