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Weather Map
NWS Radar Map for New Jersey


 

PEQUANNOCK RIVER CONDITIONS

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
May 24, 2017 - 02:45 PM EDT / 2017.05.24 1845 UTC
Wind: from the ESE (120 degrees) at 20 MPH (17 KT) gusting to 22 MPH (19 KT)
Visibility: 10 mile(s)
Sky conditions: overcast
Temperature: 69 F (21 C)
Dew Point: 50 F (10 C)
Relative Humidity: 49%
Pressure (altimeter): 29.75 in. Hg (1007 hPa)
ob: KMMU 241845Z 12017G19KT 10SM SCT048 OVC085 21/10 A2975
updated: 128 PM EDT Wed May 24 2017
THIS AFTERNOON
  Partly sunny. Highs in the upper 60s. East  winds around 10 mph.
TONIGHT
  Mostly cloudy. A chance of rain after midnight. Lows  around 50. East winds 5 to 10 mph. Chance of rain 50 percent.
THURSDAY
  Showers. A slight chance of thunderstorms in the  morning, then a chance of thunderstorms in the afternoon. Highs  in the lower 60s. East winds around 10 mph with gusts up to  20 mph. Chance of rain 80 percent.
THURSDAY NIGHT
  Patchy fog in the evening. Showers likely. Lows  in the lower 50s. East winds 5 to 10 mph, becoming northeast  after midnight. Chance of rain 70 percent.
FRIDAY
  Mostly cloudy. Showers likely, mainly in the morning.  Highs in the upper 60s. Northwest winds 5 to 10 mph. Gusts up to  20 mph in the afternoon. Chance of rain 60 percent.
FRIDAY NIGHT
  Mostly cloudy in the evening, then becoming  partly cloudy. Lows in the mid 50s.
SATURDAY
  Mostly sunny. Highs in the lower 70s.
SATURDAY NIGHT
  Partly cloudy in the evening, then becoming  mostly cloudy. Lows in the mid 50s.
SUNDAY
  Mostly cloudy with a 50 percent chance of showers.  Highs around 70.
SUNDAY NIGHT
  Mostly cloudy with a 40 percent chance of  showers. Lows in the mid 50s.
MEMORIAL DAY
  Mostly cloudy in the morning, then becoming  partly sunny. A 40 percent chance of showers. Highs in the lower  70s.
MONDAY NIGHT
  Mostly cloudy. A chance of showers in the  evening. Lows in the mid 50s. Chance of rain 30 percent.
TUESDAY
  Partly sunny. Highs in the mid 70s.




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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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