The radar is down until approximately 3 PM on Wednesday July 1st for maintenance.
Be aware that starting Monday July 13th the radar will be down for approximately 2 weeks. Technicians will be swapping out the pedestal. See the NWS blog article for more information.
You might have noticed a couple new readings in the “Current Conditions” section of our home page. I’ve installed 2 new sensors on our main weather station, a Davis Vantage Pro2, to measure output from the Sun.
One sensor reads a narrow band of ultraviolet (UV) radiation. The 290 – 390 nm spectrum of the sun’s shortwave energy particularly affects human health. Readings are translated into a universal UV index (1 – 16 scale).
The other sensor measures broad spectrum solar radiation (a.k.a. “solar irradiance”, “solar insolation”) between 300 – 1100 nm. It’s output scale is 0 – 1800 Watts per meter squared (W/m2). This is useful for solar energy management & approximating cloud cover / ambient light. You may wonder “can’t I just look out a window?” If you are in Marquette, yes. If you are elsewhere, no.
Continue reading “Here Comes The Sun”
As noted in the about page, I regularly check our sensors to be sure they are within specifications. Over the last couple weeks I have been conducting tests.
Temperature was right on. That’s typical, as our sensor is pretty bulletproof. I have a platinum RTD digital thermometer that’s accurate to within 0.1° F (best to check on a cloudy, windy night to eliminate radiation as a factor). I also have a laboratory-grade aspirated psychrometer with a dry bulb thermometer that’s extremely accurate. It’s analog, so the biggest challenge is reading between the lines. But my tests show the station’s thermal sensor is within 0.5° during the day which is quite good. There’s also a backup sensor on site as well. At night or on cloudy/rainy days, the two sensors are normally within 0.2° F. During sunny days, height (7 ft vs 21 ft) and shielding differences (active vs passive ventilation) can frequently lead to 1° differences in either direction. 2-3° differences are not out of the question when it’s particularly calm and sunny.
Continue reading “Instrument Calibrations”
The National Weather Service Marquette has experienced a radar transmitter failure. See updates below.
UPDATE 2/16/20 10:00 AM: Radar has been returned to service.
UPDATE 2/16/20 7:00 AM: Radar transmitter out of service again. Technician will work on it this morning.
UPDATE 2/13/20 1:20 PM: Radar has been returned to service.
UPDATE 2/12/20 2:40 PM: Parts are on order. Return to service expected by 4 PM tomorrow.
UPDATE 2/12/20 8:00 AM: Radar transmitter out of service again.
UPDATE 2/10/20 6:30 PM: Radar has been returned to service.
UPDATE 2/10/20 4:50 PM: Radar transmitter out of service again.
UPDATE 2/9/20 12:30 PM: Radar has been returned to service.
The National Weather Service Marquette will be replacing some radar equipment starting Monday September 9th through Friday September 13th. During that time, you will see a “Down for Maintenance” indicator where the radar image typically resides on our home page.
For more info, see their blog article: https://www.weather.gov/mqt/KMQT_SLEP
UPDATE 9/11/19: Apparently the NWS radar techs wrapped up their work 2 days early. The radar was returned to service this afternoon.