Wednesday, September 20, 2017

Weather Discussion for Wednesday September 20, 2017

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.

A low pressure trough is dropping southward along the west coast and over the western U.S. (see satellite picture  below).  This system will move across Northern California today and early Thursday with light rain or showers over the foothills and mountains and in the valley north of Red Bluff.  Temperatures today will be 15 to 25 degrees below normal.  Gusty southwest to northwest winds will occur this afternoon.  

Thursday the trough continues to slowly shift eastward.   Showers will continue over the areas north and east of the valley with partly to mostly sunny skies elsewhere.  Temperatures will continue well below normal.  The trough will continue slowly eastward as a high pressure ridge develops along the west coast. (see map below).  This ridge will bring mostly clear skies to the north state.  Temperatures start warming Friday and by weekend will be back above normal.  Periods of gusty north winds will occur Friday through early next week. 

The Old Forecaster.

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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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Saturday, September 16, 2017

Weather Discussion for Saturday September 16, 2017

Normal high and low temperatures for Sept 11-Sept 18 (high/low)...Redding 90/58, Chico 89/54, Quincy 81/37, Chester 77/36, Susanville 78/43, Grass Valley 81/49, Weaverville 86/42, Mt. Shasta 77/44, Yreka 82/46, Alturas 78/36

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 clouds over Northern California this morning are from the southern end of a frontal system moving through western Canada.   There could be a few sprinkles over the areas near the Oregon border and the clouds will be clearing out during the afternoon. 

Sunday a low pressure trough begins to deepen over the western U.S. and Monday through Thursday we will be under a weather pattern like the one on the map below.   A large scale low pressure trough will be over the western U.S. and will send a series of frontal systems across our area.   The problem is that the trough is more over land than water and the storm systems won't have much moisture associated with them.  

The first system will move through Sunday night and Monday and will bring clouds to the area with a few light showers over the north coast and Siskiyou county.   Temperatures will be a little below normal and gusty southwest to west winds will precede this system.   Tuesday we will see partly sunny to partly cloudy skies and then 2 more frontal systems will be move through the north state.   One Tuesday night and Wednesday and the next Wednesday night and Thursday.   Once again we will see clouds and gusty southwest to west winds from these systems.  The Tuesday night system will bring light rain or showers to the north coast and Siskiyou and Modoc counties.  The Tuesday night Wednesday system will bring light rain or showers to the north coast, Siskiyou, northern Shasta, Modoc, Lassen, and Plumas counties.  Temperatures Tuesday through Thursday will be below normal. 

Friday the trough will shift a little eastward and the north state will have mostly sunny skies with warmer temperatures and gusty north winds.

The Old Forecaster.

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Wednesday, September 13, 2017

Weather Discussion for Wednesday September 13, 2017

Normal high and low temperatures for Sept 11-Sept 18 (high/low)...Redding 90/58, Chico 89/54, Quincy 81/37, Chester 77/36, Susanville 78/43, Grass Valley 81/49, Weaverville 86/42, Mt. Shasta 77/44, Yreka 82/46, Alturas 78/36

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.

Finally some changes to talk about...

The low pressure area is still off the coast but is beginning to move eastward as a low pressure trough drops southeastward through the Pacific Northwest.   The combination of these two will cause isolated showers and thunderstorms over the higher elevations today and over Lassen and Modoc counties Thursday.   Temperatures today will be cooler but still 4 to 8 degrees above normal.  Temperatures Thursday will be normal to a few degrees below normal.  Light south winds today and then light moderate southwest to northwest winds Thursday.

Friday and Saturday the north state will be mostly clear with a few mid and high clouds Saturday from a storm moving by to the north.  Temperatures will be near normal.  Gusty north winds will occur Friday and early Saturday.

Sunday things start to change as the first "fall like"  low pressure trough deepens along the west coast and over the western U.S. (see map below).  Clouds will begin to increase Sunday.  Sunday night and Monday there will be light rain or showers along coast and over the coastal mountains from Mendocino county northward....over the areas north of Redding and over the Cascade Sierras from Plumas county northward.   In the valley there will be light showers or sprinkles from Red Bluff northward.  Tuesday there will be light rain or showers over the areas north and east of the valley.   Temperatures will be cooling and will be 10 to 20 degrees below normal by Tuesday.   Gusty southwest winds will occur Sunday afternoon and Monday. 

Wednesday the trough will be east of our area.  Clear skies and gusty north winds are expected. 

The Old Forecaster.

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Monday, September 11, 2017

Weather Discussion for Monday September 11, 2017

Normal high and low temperatures for Sept 11-Sept 18 (high/low)...Redding 90/58, Chico 89/54, Quincy 81/37, Chester 77/36, Susanville 78/43, Grass Valley 81/49, Weaverville 86/42, Mt. Shasta 77/44, Yreka 82/46, Alturas 78/36

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.

Yesterday was the 70th day this year that Redding has been over 100 degrees that breaks the old record of 69 days set in 1967.

The low pressure area off the southern California coast is moving slowly northward.  The low will continue north and then get pushed eastward late Tuesday and Wednesday as a low pressure trough moves into the the Pacific Northwest (see map below).   Clouds will spread northward over our area today and all of the north state will have a chance of showers and thunderstorms tonight and Tuesday.  Wednesday the showers and thunderstorms will be confined to the higher elevations.  Temperatures today will be a little cooler than yesterday with further cooling Tuesday and Wednesday.  Light to moderate southeast to south winds will occur later today and Tuesday. 

The other thing the low pressure trough in the Pacific northwest will do is push the high pressure ridge eastward.  Thursday through the weekend we will have mostly clear skies with temperatures near normal for this time of year.  A strong low pressure trough will reach the coast late Sunday and will bring clouds to the north end of the state late Sunday and Monday with a few light showers possible. 

The Old Forecaster.

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Saturday, September 9, 2017

Weather Discussion for Saturday September 9, 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.

There is another weak upper level low pressure area off the Southern California coast (see satellite picture below).   This low will remain stationary until midday Monday.  Today and Sunday the inland areas of Northern California will be mostly sunny with some afternoon cumulus clouds over the mountains.  There is a chance of isolated afternoon and evening thunderstorms over the higher elevations east of the valley.   Temperatures today will be 3 to 6 degrees above normal and 5 to 10 degrees above normal Sunday and Monday.  Winds will be light. 

Monday afternoon the low will begin move northward and will move across the north state Tuesday and early Wednesday. (see map below).  During this time we will see some clouds with scattered showers and thunderstorms.  Temperatures will cool back to below normal.  

Thursday through next weekend the jetstream will be to our north across the Pacific Northwest and Canada.  During this time we will see mostly sunny skies with a few mid and high clouds from storms moving by to our north.  Temperatures will be near normal. Winds will be light. 

The Old Forecaster.

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Wednesday, September 6, 2017

Weather Discussion for Wednesday September 6, 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.

The low pressure area is still off the coast but is being drawn northward by the low pressure trough and frontal system moving toward Canada. (see satellite picture below).  The remains of the low will move across Northern California late tonight and Thursday.   The good news it that this has weakened the high pressure ridge and pushed it a little eastward.   Today and Thursday the north state will see a few clouds with showers and thunderstorms mainly over the higher elevations with isolated activity in the north valley.  Temperatures today and Thursday will be normal to slightly above.   Light to moderate south to southwest winds will occur in the afternoon.

Friday another weak upper level low pressure area will form off the coast.  This low will drop slowly southward and will be off the Southern California coast by the weekend.  Friday there will still be afternoon and evening thunderstorms over the mountains.  Saturday and Sunday will be sunny and warmer.  Temperatures by the weekend will be 5 to 10 degrees above normal.   

Monday the low will begin to move northward.   Tuesday and Wednesday we will see the shower and thunderstorm activity increase across all of the north state.  

The Old Forecaster.

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