Monday, February 27, 2017

Weather Discussion for Monday February 27, 2017

Normal high and low temperatures for Feb 27-March 6 (high/low)...Redding 61/42, Chico 63/40, Quincy 53/28, Chester 48/25, Susanville 49/27, Grass Valley 55/35, Weaverville 57/30, Mt. Shasta 49/29, Yreka 53/29, Alturas 48/22

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 trough is exiting Northern California this morning.  However, there will be enough residual moisture and instability to generate snow flurries over the higher elevations this afternoon and evening.  Tuesday through Friday a weak high pressure area will be just off the coast (see map 1 below).  During this time the north state will be partly to mostly sunny with slightly above normal temperatures and light winds.

The large scale weather pattern will change on the weekend.   The models are in poor agreement on how strong the change will be.  All model runs show the high pressure ridge shifting westward and the jetstream dropping southward toward Northern California (see map 2 below).   The difference in the runs is that some runs bring the jetstream only as far south as Central Oregon, while other runs drop it as far south as Central California.  At this time expect the weekend to be cooler with some clouds late Saturday and Sunday with showers over the areas north or Redding.

The Old Forecaster

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Friday, February 24, 2017

Weather Discussion for Friday February 24, 2017

Normal high and low temperatures for Feb 20-Feb 27 (high/low)...Redding 62/40, Chico 62/40, Quincy 53/27, Chester 48/23, Susanville 48/26, Grass Valley 56/34, Weaverville 56/30, Mt. Shasta 49/29, Yreka 53/28, Alturas 47/22

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 shows a cold low pressure area off the Pacific Northwest coast.   This low is dropping southward and will move across Northern California tonight and early Saturday.  Another cold low pressure area will drop southward through the area late Sunday and early Monday.

Both of these systems are cold but also have very limited moisture with them.   Clouds will increase later today with snow showers or flurries over the foothills and mountains tonight and early Saturday.  Snow levels will be 500 to 1000 feet in the north and 1500 to 2500 feet south.  While I feel the showers will miss the valley, we could see a few snow flurries in the Redding area.  Skies will clear Saturday during the day and then clouds increase again Sunday afternoon.  Sunday night and early Monday the next system will move through our area.  Once again we will see light snow or flurries over the foothills and mountains with snow levels about like tonight's storm.   Most of the valley will stay dry but once again Redding could see a few snow flakes.  

Skies will clearing during the day Monday as high pressure builds off the coast.  Tuesday through the rest of the week high pressure will be along or off the coast (see map below).  The north state will be mostly sunny with above normal temperatures. 

The Old Forecaster

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Wednesday, February 22, 2017

Weather Discussion for Wednesday February 22, 2017

Normal high and low temperatures for Feb 20-Feb 27 (high/low)...Redding 62/40, Chico 62/40, Quincy 53/27, Chester 48/23, Susanville 48/26, Grass Valley 56/34, Weaverville 56/30, Mt. Shasta 49/29, Yreka 53/28, Alturas 47/22

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 remains of the low pressure trough will move across Northern California today.  This will cause showers an possible thunderstorms this afternoon. Snow levels will be 2500 to 3500 feet.   Thursday the north state will see partly to mostly sunny skies with normal temperatures and light to moderate north winds.

Friday we begin to shift back to colder and not as wet weather pattern.   High pressure will be off the coast and the jetstream will be dropping southward from Alaska and the hooking inland over California (see map below).  Clouds will begin to increase Friday afternoon and then Saturday the first low pressure trough will move through.  This system will bring light precipitation to our area.   Snow levels will be 2000 to 3000 feet but down to 1000 to 1500 feet from Redding northward due to trapped cold air.   Sunday afternoon and Monday the next low pressure trough will move through.  This system will bring a little heavier precipitation to the area especially over Central California.   Snow levels will be 1500 to 2500 feet in the north and 3000 to 4000 feet in the Tahoe area.  

Skies will be clearing Tuesday as the high pressure ridge moves closer to the coast and dry weather should continue through the end of next week. 

The Old Forecaster

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Monday, February 20, 2017

Weather Discussion for Monday February 20, 2017

***WET AND WINDY TODAY AND TUESDAY***


Normal high and low temperatures for Feb 20-Feb 27 (high/low)...Redding 62/40, Chico 62/40, Quincy 53/27, Chester 48/23, Susanville 48/26, Grass Valley 56/34, Weaverville 56/30, Mt. Shasta 49/29, Yreka 53/28, Alturas 47/22

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.

Last blog it looked like the storm system would come through Sunday afternoon and Monday.   However, the system is split with the first system coming through last night and the next system due tonight and early Tuesday.  Rain with last night's system was heavier from Redding southward and this system was warm with the colder air remaining off the coast with the second storm.   Today we will see periods or rain or showers with gusty south winds.  Snow levels will be 6000 feet north and 7000 feet south.

The next system will move inland tonight.   Moderate to heavy precipitation is expected tonight and early Tuesday.  Snow levels will lower by Tuesday morning to 3500 to 4500 feet north and little higher south.  Strong gusty south winds will occur tonight and early Tuesday with gusts 55 mph in the valley and 65 mph over the higher elevations.   The precipitation will turn to showers Tuesday afternoon and end by evening.  

Wednesday and Thursday the north state will have partly sunny to partly cloudy skies with isolated snow flurries over the higher elevations Wednesday.

Friday we switch back to a colder weather pattern (see map below).   The jetstream will be dropping southward along the coast and then across Northern California.   A low pressure trough will move through Friday afternoon and Saturday.   This system will bring light precipitation to the area with snow levels 1500 to 2000 feet north and 2000 to 3000 feet south.  

The trough will be east of area by Sunday and we will have mostly sunny skies and cool temperatures. 

The Old Forecaster

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Friday, February 17, 2017

Weather Discussion for Friday February 17, 2017

Normal high and low temperatures for Feb 13-Feb 20 (high/low)...Redding 60/40, Chico 61/40, Quincy 52/27, Chester 46/23, Susanville 47/25, Grass Valley 56/35, Weaverville 55/30, Mt. Shasta 47/30, Yreka 51/27, Alturas 46/22

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 and frontal system is now moving into California.  This system will bring light to moderate rain to the north end of the state today and tonight, with heavier precipitation over Central and Southern California.  Snow levels will be 3500 to 4500 feet.   The precipitation turns to showers late tonight and Saturday looks partly cloudy with scattered showers mainly over the higher elevations.

Sunday afternoon and Monday the next system moves through the area.  This looks like a strong storm.   Rain will start Sunday with heavy rain Sunday afternoon through  early Monday.   Snow levels will be 2500 to 3500 feet north and 4000 feet south.  This system will also bring strong gusty south winds to the area Sunday and early Monday with gusts 55 mph in the north valley and 65 mph over the higher elevations.   The precipitation will turn to showers by midday Monday.  

A weaker storm system will move through the area late Tuesday and Wednesday with light precipitation. Snow levels will be about like the Sunday storm.   It looks like another storm could move through late Thursday and Friday.  

This week the blog will be updated on Friday Feb 17th, instead of Saturday.

The Old Forecaster

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Wednesday, February 15, 2017

Weather Discussion for Wednesday February 15, 2017

Normal high and low temperatures for Feb 13-Feb 20 (high/low)...Redding 60/40, Chico 61/40, Quincy 52/27, Chester 46/23, Susanville 47/25, Grass Valley 56/35, Weaverville 55/30, Mt. Shasta 47/30, Yreka 51/27, Alturas 46/22

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 week the blog will be updated on Friday Feb 17th, instead of Saturday.

Ref question yesterday....hard to compare years.   Probably '55, '64, and the 97/98 el nino year.

A frontal system is approaching the coast and will spread precipitation slowly eastward.  Moderate to heavy rain is expected over Northern California tonight and early Thursday with snow levels 5000 to 6000 feet north and a little higher south.  Gusty south winds will occur later today and tonight.   The precipitation will turn to showers Thursday morning and end by Thursday evening.

The next storm system will take a more southern track and move across Southern California late Friday and Saturday.   Northern California will get rain from this system Friday afternoon through early Saturday.  Snow levels will be 4500 to 5500 feet.  The precipitation will taper off Saturday morning and end by afternoon.

There will be a brief break late Saturday and early Sunday and then another low pressure trough and frontal system will move across Sunday afternoon and Monday (see map below) and will be followed by another system Tuesday and Wednesday.  The Sunday/Monday storm looks like it will bring moderate to heavy rain with snow levels 3500 to 4500 feet.   The Tuesday/Wednesday storm won't be as wet but will be colder.

The Old Forecaster

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Monday, February 13, 2017

Weather Discussion for Monday February 13, 2017

Normal high and low temperatures for Feb 13-Feb 20 (high/low)...Redding 60/40, Chico 61/40, Quincy 52/27, Chester 46/23, Susanville 47/25, Grass Valley 56/35, Weaverville 55/30, Mt. Shasta 47/30, Yreka 51/27, Alturas 46/22

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.

High pressure is still along and over the west coast.   However, it is beginning to weaken.  Today and Tuesday the north state will be partly sunny with high cloudiness. Temperatures will be near normal and winds will be light.

The high will breakdown Wednesday and the jetstream will run across the Pacific and over Northern California. (see map below).  This will start another "wet period" for Northern California.  The first frontal system will spread rain over the area Wednesday.  The precipitation will continue through midday Thursday.  Snow levels will be 5000 to 6000 feet in the north and 6000 feet in the south.  Heaviest precipitation will be Wednesday night and early Thursday.  Gusty south winds will precede this system.

There will be brief break late Thursday and then Friday and Saturday a stronger storm system will move through the north state with moderate to heavy precipitation.  Snow levels will drop to 3500 to 4500 feet by Saturday.  The precipitation turns to showers late Saturday.  

It looks like another frontal system will move through the area late Sunday and Monday.

The Old Forecaster

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Friday, February 10, 2017

Weather Discussion for Friday February 10, 2017

Normal high and low temperatures for Feb 6-Feb 13 (high/low)...Redding 61/40, Chico 59/38, Quincy 51/26, Chester 46/23, Susanville 46/24, Grass Valley 56/34, Weaverville 54/30, Mt. Shasta 48/27, Yreka 50/27, Alturas 46/21

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 week the blog will be updated on Friday the 10th instead of Saturday.

The main frontal band moved through yesterday.   However the low pressure trough is sill along the coast and will move across the north state today.   This trough will trigger showers and thunderstorms as it moves through. Snow levels will be 4000 to 5000 feet.   The showers will end tonight.

Saturday high pressure will be building along and over the coast.  We will have partly to mostly sunny skies with normal temperatures and light to moderate north winds.   The high pressure ridge will hold through Tuesday for continued partly to mostly sunny skies.   Temperatures will be above normal and winds will be light.

Wednesday the high will be breaking down as the jetstream...once again...takes aim at Northern California (see map below).   This means another period of wet and windy weather.   The first storm will bring precipitation to the area Wednesday night and Thursday and will be followed by another system on the weekend. 

The Old Forecaster

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Wednesday, February 8, 2017

Weather Discussion for Wednesday February 8, 2017

Normal high and low temperatures for Feb 6-Feb 13 (high/low)...Redding 61/40, Chico 59/38, Quincy 51/26, Chester 46/23, Susanville 46/24, Grass Valley 56/34, Weaverville 54/30, Mt. Shasta 48/27, Yreka 50/27, Alturas 46/21

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 week the blog will be updated on Friday the 10th instead of Saturday.

This morning's satellite picture (below) shows the low pressure area still off the coast sending bands of clouds toward Northern California.  The low is moving slowly eastward.  Heavy rain and strong gusty south winds are expected this afternoon through early Thursday afternoon. Snow levels will continue to be high....6000 to 7000 feet north and 7000 to 8000 feet south.  Winds gusts of 50 to 55 mph are expected in the north valley and 65 mph over the high elevations.  

The heaviest rain and winds should be over by mid afternoon Thursday, but periods of rain or showers will continue through Friday afternoon.   Snow levels will begin to drop Thursday afternoon and by early Friday will be down to 3000 to 4000 feet north and 4000 to 5000 feet south. 

The showers will end by Friday night and skies will be clearing as high pressure builds along and over the west coast.  This high pressure ridge should hold over our area through next Tuesday (see map below).  During this time we will see partly to mostly sunny skies and slightly above normal temperatures. 

It now looks like the high pressure ridge will breakdown near week and another low pressure trough will bring precipitation to the area late Wednesday. 

The Old Forecaster

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Monday, February 6, 2017

Weather Discussion for Monday February 6, 2017

Normal high and low temperatures for Feb 6-Feb 13 (high/low)...Redding 61/40, Chico 59/38, Quincy 51/26, Chester 46/23, Susanville 46/24, Grass Valley 56/34, Weaverville 54/30, Mt. Shasta 48/27, Yreka 50/27, Alturas 46/21

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 first is a series of storms is now moving east of our area.   This mornings satellite picture below shows lots of clouds and a series of frontal systems to our west.  The next system moves through tonight and Tuesday with another system Wednesday night and Thursday. (see map below).  Each frontal system will bring moderate to heavy precipitation to the north state.  The periods between the frontal systems we will have partly cloudy to cloudy skies and scattered showers.  Snow levels today are 5500 to 6500 feet.   Snow levels tonight through Thursday will be 6000 to 7000 feet north and 7000 to 8000 feet south.  Strong and gusty south winds will precede each frontal system with gusts...tonight and early Tuesday and Wednesday night and early Thursday... 50 to 55 mph in the valley and 65 mph over the higher elevations.

The precipitation turns to showers on Friday with snow levels dropping to 4000 to 5000 feet.   Skies will be clearing for the weekend as high pressure rebuilds along the coast. 

The Old Forecaster

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Saturday, February 4, 2017

Weather Discussion for Saturday February 4, 2017

Normal high and low temperatures for Jan 30-Feb 6 (high/low)...Redding 60/37, Chico 59/38, Quincy 49/24, Chester 45/21, Susanville 43/22, Grass Valley 56/33, Weaverville 53/30, Mt. Shasta 48/27, Yreka 48/25, Alturas 44/19

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 large low pressure area is off the Canadian Coast (see satellite picture below).  This system will send another frontal system across the north state today with more rain and gusty south winds.  Snow levels will be 5000 to 6000 feet north and a little higher to the south.  The precipitation will turn to showers tonight and decrease.  Sunday will start off partly cloudy to cloudy with isolated showers over the higher elevations.   However,  the low pressure area off the Canadian coast will act like a "pitching machine" and pickup the low pressure area shown on this morning's satellite picture in the Central Pacific (see black arrow) and shoot it eastward.   The low will move through Northern California Sunday night and Monday with more moderate to heavy precipitation and gusty south winds.  Snow levels will be 6000 feet or higher Sunday but will drop to 4000 to 5000 feet on Monday.   The precipitation will turn to showers and decrease Monday afternoon and evening.

Tuesday the large low pressure area that is currently off the Canadian coast will reform back to the west (see map below).  This will sag the jetstream southward in the Central Pacific and then run northeastward into Northern California.   This weather pattern taps sub tropical moisture and results in warm...wet...storms hitting the north state.   Tuesday through Thursday look for periods of rain...heavy at times...snow levels will be over 7000 feet.  Gusty south to southwest winds are expected.   The precipitation will turn to showers Friday and snow levels will drop to 3500 to 4500 feet.  

Saturday high pressure will begin to rebuild along the coast and we will see clearing and drying.   

The Old Forecaster

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Wednesday, February 1, 2017

Weather Discussion for Wednesday February 1, 2017

Normal high and low temperatures for Jan 30-Feb 6 (high/low)...Redding 60/37, Chico 59/38, Quincy 49/24, Chester 45/21, Susanville 43/22, Grass Valley 56/33, Weaverville 53/30, Mt. Shasta 48/27, Yreka 48/25, Alturas 44/19

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 area to our west with several cloud bands spiralling off it.   This system is moving slowly eastward.   Clouds will increase today with precipitation spreading over the area tonight and early Friday.   Light to moderate rain is expected Thursday through Friday evening.  Snow levels will be 4000 to 5000 feet in the north and 5000 to 6000 feet to the south (Tahoe).  The low will move across Northern California Friday night.  added at 9:45am....Strong gusty south winds will occur Thursday night and early Friday.  

Saturday and most of Sunday the north state will see partly cloudy to cloudy skies with scattered showers mainly over the foothills and mountains.  Snow levels will be 4000 to 5000 feet.

A low pressure area will be dropping southward along the Pacific Northwest coast late Sunday. (see map below)   This system will bring more rain to the area Sunday night and Monday with snow levels around 4000 feet north and 5000 feet south.  

The precipitation turns to showers Tuesday and then another storm system will reach the coast Wednesday.

The Old Forecaster

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