7dayWest_Sat_Rad_Large_Pac

Very Warm…Very dry. And a lot of sun to boot. That’s pretty much the forecast for the next week or so. A strong ridge of high pressure will take up residence over the west coast through the forecast period, kicking up our high temperatures into the mid-90s, but giving just enough stabilizing west flow to keep thunderstorms from developing. With summer officially starting Thursday morning, we will be in mid-summer form by that time.

pole reversal

Yesterday I mentioned the earth’s magnetic field will flip over and reverse every so often. There’s no real clear reason why the flipping occurs, although several theories have been proposed, all of which are hard to prove. And although the flipping seems to occur almost instantly from a geological perspective, it probably takes anywhere from a hundred to a few thousand years to complete. The last one happened 780,000 years ago… or “Pre-Geologists.”

magnetstripes2

Just how do we know that? We can thank molten lava. Basalts on the ocean floor, for example, contain a mineral called magnetite which, as its name implies, is magnetic. When rocks are in a molten state, the magnetite crystals align themselves with the earth’s magnetic field. When the lava hardens, the magnetite is stuck in that magnetic orientation. Analysis of sea floor basalts show alternating bands of north and south oriented magnetite crystals, showing the earth’s magnetic field made similar flips as the sea floor was extruded.

 

 

Mike can be reached at malger@ktvn.com

 

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