High temperatures will continue through the weekend, with 100 degree days a possibility through Sunday. All that heat, combined with some residual moisture from the isolated thunderstorms of the last couple of days will result in some afternoon cloudiness, and a slight chance of an isolated thunderstorm, mainly up in the mountains, although one drifting off the hills is a slight possibility. Temperatures only ease slightly next week, with scattered to isolated thunderstorms in the forecast through the middle of next week.

late night radio

So why do so many radio stations appear at night on your car radio? Actually, you can blame the sun and the ionosphere for that.  The ionosphere is that portion of the atmosphere above the stratosphere (about 50 to 600 miles above the earth’s surface) that contains a high concentration of ions.  The sun I think you already know about.

ionosphere

Radio waves can only travel in a straight line, and because the earth is curved, most stations can only be heard about 60 miles away because the earth gradually curves under and away from those signals. But the ionosphere can act as a backboard, bouncing the signal back down the earth at a much farther distance, hundreds or even thousands of miles away.

Tomorrow, I’ll tell you why the bounce doesn’t work during the day.

 

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