Monday, June 21, 2021

Weather Discussion for Monday June 21, 2021

Normal high/ low temperatures for June 21-June 28 (high/low)   Redding 94/63, Chico 93/58, Quincy 85/43, Chester 80/43, Susanville 83/47, Grass Valley 83/53, Weaverville 87/46, Mt. Shasta 80/47, Yreka 85/48, Alturas 81/42

This blog will be issued every Monday, Wednesday, and Saturday morning and updated if the weather is changing or critical or interesting weather events are occurring. 

The strong high pressure ridge extends from the southwest U.S. to off the coast.  There is one center over the southwest and another center off the coast.  Between these two a weak upper level low pressure trough is forming.  This is like a saddle between two peaks.  The low has no steering winds so it will wobble around just off the coast through at least Thursday (see map below).  Moisture with this system is limited but will trigger afternoon and evening thunderstorms over the higher elevations.  Temperatures will be cooler, especially in the valley where cooler air is moving through the Delta into the Sacramento area.  Today through Thursday temperatures will be slightly above normal.  Winds will increase from the south and southwest in the afternoons.  

The low is expected to either dissipate or drop southward by Friday.  This means the high pressure returns and the weekend and early next week look hot. 

The Old Forecaster
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