Weather or Knot
Click and mouse over weather map. Very interactive.
Knots Made Easy (click above)
An American Sailing Association Educational Series
Great info from the Record Bee. Very useful sites in these times of fire and smoke.
1) Purple Air – Founded in 2015, the site sells outdoor air monitors that measure dust, smoke, soot, and other particulates. The site tracks thousands of its sensors on a worldwide map, allowing anyone to enter a zip code, zoom in and see current air quality in their community, along with the trend there in recent days. www.purpleair.com
2) Air Now – This website, maintained by the U.S. Environmental Protection Agency, provides similar real-time air pollution data. www.airnow.gov
3) Spare the Air – Operated by the Bay Area Air Quality Management District, this site provides air pollution measurements in the nine-county Bay Area, along with a five-day forecast, information about commuter incentives and rules on wood-burning fireplaces. Information is at www.sparetheair.org or www.baaqmd.gov/about-air-quality/current-air-quality
4) Air Visual – A worldwide map of air quality sensors in big cities is here, although it’s not as extensive as Purple Air’s. But the site does show fascinating wind direction graphics and ranks which cities have the worst particulate pollution globally. www.airvisual.com/world-air-quality
5. Windy.com — See which direction the wind is blowing, along with other weather information, in a stylish format. www.windy.com
On all of these sites, make sure you are looking at readings for what’s called “PM 2.5.” That’s scientific jargon for “particulate matter that is 2.5 microns in size or smaller.” Those are microscopic, tiny bits of soot and dust: Each particle is less than one-tenth the width of a human hair.
One more site comes from Brad King. He mentioned this site of PG&E mountain cameras in one of his Commodore messages from last year. Real time pictures. http://www.alertwildfire.org/northbay/index.html?camera=Axis-StHelenaNorth