Monday, September 4, 2017

Weather Discussion for Monday September 4, 2017

Normal high and low temperatures for Sept 4-Sept 11 (high/low)...Redding 94/59, Chico 92/56, Quincy 84/38, Chester 81/40, Susanville 82/45, Grass Valley 85/52, Weaverville 89/43, Mt. Shasta 81/44, Yreka 85/46, Alturas 83/38

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 year Redding has now had 68 days over 100.  The record is 69 set in in 1967.  Looks like we will tie the record today.

The good news is cooler weather is coming.   This morning's satellite picture (below) shows the low pressure area is still off the Southern California coast, but is moving northward.  The low has quite a bit of subtropical moisture from old storm Lidia entrained in it.  The low will continue moving slowly northward and will be off the Northern California coast by late Tuesday.  Wednesday and Thursday the low will get pushed northeastward by a deepening trough in the Gulf of Alaska (see map below).   This will also weaken the high pressure ridge that has been over the western U.S.  Today the north state will be smoky with a few clouds.  There will be afternoon and evening thunderstorms over the Sierra Cascades...(Modoc, eastern Siskiyou, Lassen, Plumas and Nevada counties).  Temperatures today will be 3 to 5 degrees cooler.  Tuesday through Thursday the showers and thunderstorms will become more widespread with activity occurring over the coastal and northern mountains and over the Sierra Cascades.  Late Tuesday through Thursday there will a chance of an isolated shower or thunderstorm across the north valley.  Temperatures will continue slowly cool and will be down to near normal by Thursday.  Winds will be south to southwest in the afternoons,

Friday and Saturday there will be another weak upper level low off the Northern California coast.  This low will continue the threat of afternoon and evening thunderstorms.  Temperatures will be normal or slightly above.  Sunday and early next week temperatures will warm back to above normal.

The Old Forecaster.

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