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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
Sep 26, 2017 - 09:45 AM EDT / 2017.09.26 1345 UTC
Wind: Calm
Visibility: 10 mile(s)
Sky conditions: mostly clear
Temperature: 71 F (22 C)
Dew Point: 66 F (19 C)
Relative Humidity: 83%
Pressure (altimeter): 30.07 in. Hg (1018 hPa)
ob: KMMU 261345Z 00000KT 10SM FEW150 22/19 A3007
updated: 951 AM EDT Tue Sep 26 2017
  Sunny. Highs in the lower 80s. Light and  variable winds, becoming east around 5 mph.
  Partly cloudy in the evening, then becoming mostly  cloudy. Patchy fog after midnight. Lows in the lower 60s.  Southeast winds around 5 mph in the evening, becoming light and  variable.
  Partly sunny. Patchy fog in the morning. A slight  chance of showers in the afternoon. Highs in the lower 80s.  Northeast winds around 5 mph, becoming east in the afternoon.  Chance of rain 20 percent.
  Mostly cloudy with a 20 percent chance of  showers. Lows in the lower 60s. Southeast winds around 5 mph,  becoming north after midnight.
  Mostly sunny. Less humid with highs in the lower 70s.  North winds 5 to 10 mph. Gusts up to 20 mph in the afternoon.
  Mostly clear. Lows in the upper 40s.
  Sunny. Highs in the upper 60s.
  Partly cloudy in the evening, then becoming  mostly cloudy. Lows in the mid 40s.
  Mostly sunny. Highs in the lower 60s.
  Mostly clear. Lows in the mid 40s.
  Sunny. Highs in the upper 60s.
  Mostly clear. Lows in the lower 40s.
  Sunny. Highs in the upper 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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