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Conditions are setting up perfectly for an early summer heat event across California, with the hottest locations in the North Bay expected to reach 100 degrees on Saturday. The very good news is that there is no offshore wind component to this heat-up, so fire danger will be low, and the immediate coast will stay cool.

Heat advisories are in effect across the region from Friday afternoon through Sunday afternoon.

The satellite view Thursday shows very litte inland marine push, and a compressed coastal fog layer. (Image 1)

The low pressure trough that has kept us cool is moving east, and by Friday high pressure will nose into California from the west, reaching a peak intensity on Saturday. (Image 2)

That will correspond with the warmest inland temperatures, reaching the 90s to low 100s across the hottest parts of the North Bay, especially northern Sonoma and Napa counties. Cloverdale, Healdsburg, Ukiah and Calistoga should all break the 100 degree mark. With no offshore winds, the coast will stay cool, in the 60s to 70s. (Image 3)

By Monday, the high pressure ridge will begin to shift south and east. (Image 4) This will allow temperatures to moderate on Monday and Tuesday, back into the 80s inland.

In fact, the forecast for the Fourth of July Holiday looks good, with near seasonal temperatures in the 70s and 80s inland, with 60s along the coast. (Image 5)

Finally, how about the forecast for the rest of July? Right now the major long range ensemble models show pretty moderate temperatures, within a few degrees of normal, with nothing out of the ordinary showing up, at least as for now. (Image 6)

We’ll take it.





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