Monday, September 18, 2017

Weather Discussion for Monday September 18, 2918

Normal high and low temperatures for Sept 18-Sept 27  (high/low)...Redding 90/56, Chico 88/52, Quincy 80/35, Chester 76/35, Susanville 75/41, Grass Valley 81/49, Weaverville 85/40, Mt. Shasta 77/42, Yreka 80/43, Alturas 78/33

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.

This morning's satellite picture (below) shows a low pressure trough deepening along the west coast with a frontal system brushing the north end of California.   This low pressure trough will continue southward and will be over the western U.S. through Thursday (see map below).  The main thing this trough will do is drop temperatures much below normal by midweek.   Since the trough will be more over land that water its moisture will be limited.   The trough will send frontal systems and bands of clouds across the north state.   The system moving through today will bring light rain or showers to the north coast, Siskiyou, Trinity, northern Shasta and Modoc counties.  Tuesday we will see partly cloudy to partly sunny skies and cooler temperatures.  Tuesday night through Thursday the north state will be partly cloudy and cool with periods of rain or showers over the foothills and mountains and the chance of a light shower in the valley north of Red Bluff.  Gusty southwest to northwest winds are expected during the afternoons.

Friday the trough should shift slowly eastward and Friday through the weekend looks clear and warmer with gusty north winds. 

The Old Forecaster.

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