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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
Nov 23, 2017 - 03:35 AM EST / 2017.11.23 0835 UTC
Wind: from the NNW (340 degrees) at 6 MPH (5 KT)
Visibility: 10 mile(s)
Sky conditions: clear
Temperature: 30 F (-1 C)
Windchill: 23 F (-5 C):1
Dew Point: 19 F (-7 C)
Relative Humidity: 63%
Pressure (altimeter): 30.1 in. Hg (1019 hPa)
updated: 945 PM EST Wed Nov 22 2017
  Mostly cloudy late this evening, then clearing. Cooler  with lows in the lower 20s. Northwest winds 5 to 10 mph. Gusts up  to 20 mph late this evening.
  Sunny. Highs in the lower 40s. Northwest  winds around 5 mph.
  Mostly cloudy in the evening, then clearing.  Lows in the upper 20s. West winds around 5 mph.
  Sunny. Highs in the upper 40s. Southwest winds around  5 mph.
  Mostly clear. Lows in the lower 30s. Southwest  winds 5 to 10 mph.
  Partly sunny in the morning, then becoming mostly  cloudy. Highs around 50.
  Mostly cloudy in the evening, then becoming  partly cloudy. Lows in the lower 30s.
  Partly sunny. Cold with highs around 40.
  Mostly clear. Lows in the mid 20s.
  Sunny. Highs in the mid 40s.
  Mostly clear. Lows in the lower 30s.
  Mostly sunny. Highs in the lower 50s.
  Mostly cloudy. Lows in the mid 30s.
  Mostly cloudy. Highs in the lower 50s.

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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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