7dayWest_Sat_Rad_Large_Pac

With clearing skies and a building high pressure ridge, our temperatures will climb rapidly over the weekend, reaching the upper 90s Saturday and Sunday with sunny skies, and then likely topping 100 degrees early next week. Gusty winds in the afternoons have also kicked off another Red Flag Fire Warning from 1 pm to 9 pm Saturday.

As the ridge moves in toward the four-corners area mid-week, a light southerly flow will develop, bringing in a slight chance of afternoon thunderstorms by late in the week.

Radio Dial Night

Normally, AM radio signals are limited to line of sight reception. 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.  I once picked up a station in Minnesota while driving in Seattle.

radio waves day night

But this bouncing will work more effectively after the sun goes down. Without going into a lot of detail about the various (D, E and F) layers of the ionosphere, the lack of the sun’s rays at night changes the characteristics of the ionosphere, making it much more efficient at creating the “bounce.”  In fact, the extent of nighttime radio station reception increases so much that many stations are forced to lower their power output so they don’t interfere with other stations on similar frequencies that could be hundreds or even thousands of miles away.

 

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