Monday, May 21, 2018

Weather Discussion for Monday May 21, 2018

Normal high and low temperatures for May 21-May 28  (high/low) Redding 83/55, Chico 83/53, Quincy 75/39, Chester 70/38, Susanville 72/41, Grass Valley 73/48, Weaverville 79/41, Mt. Shasta 70/42, Yreka 75/42, Alturas 72/38

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 closed low pressure area that brought showers and thunderstorms to parts of Northern California over the weekend is now over Southern California and is moving slowly eastward.  Today there will be afternoon and evening thunderstorms over the Sierras from Mt. Lassen southward.  The rest of the north state will be mostly sunny with near normal temperatures and light north winds. 

Tuesday and Wednesday there will continue to be afternoon and evening thunderstorms over the mountains of the north state with mostly sunny skies  elsewhere.  Temperatures will be normal to a few degrees above. 

Thursday the next closed low will be forming off the coast.  This system will move across Northern California Thursday evening and Friday (see map below).  During this time we will see increased showers and thunderstorms with some activity possible in the valley.  Temperatures will be a few degrees below normal.

Saturday the low will be east of our area.  There will still be afternoon and evening thunderstorms over the mountains north and east of the valley with partly mostly sunny skies elsewhere.

Sunday and early next week look mostly clear with near normal temperatures.  

The Old Forecaster

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Saturday, May 19, 2018

Weather Discussion for Saturday May 19, 2018

Normal high and low temperatures for May 14-May 21  (high/low) Redding 81/53, Chico 82/51, Quincy 73/38, Chester 69/35, Susanville 71/39, Grass Valley 72/46, Weaverville 77/41, Mt. Shasta 68/40, Yreka 73/41, Alturas 69/35

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.

Today we will have partly to mostly sunny skies with some afternoon cumulus and isolated thunderstorms over the mountains.  Temperatures will be a little cooler than yesterday.  Note...yesterday was the first day, this year, that Redding reached 90 degrees. 

The next closed or cutoff low is already beginning to form.  The frontal system moving across the Pacific (see satellite picture below) is beginning to split.  The southern end will form a closed low over Northern California on Sunday and then move slowly southeastward Monday (see map below).  Sunday we will see more widespread mountain showers and thunderstorms with a chance of thunderstorms over the valley.  Monday the showers and thunderstorms will be over the areas east of the valley.   Temperatures Sunday and Monday will be normal or a few degrees above.

Tuesday and Wednesday the inland areas of Northern California will be partly to mostly sunny with isolated afternoon and evening thunderstorms over the mountains.  Temperatures will be above normal.  

Thursday the next closed low pressure area will be forming off the coast.  Movement of these systems is hard to forecast.  One forecast models pushes this low near the coast Thursday night and other keeps it off the coast till Saturday.  At this time expect the mountain thunderstorms to increase Friday and the weekend.  Temperatures Thursday through the weekend look to continue above normal.

The Old Forecaster

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Wednesday, May 16, 2018

Weather Discussion for Wednesday May 16, 2018

Normal high and low temperatures for May 14-May 21  (high/low) Redding 81/53, Chico 82/51, Quincy 73/38, Chester 69/35, Susanville 71/39, Grass Valley 72/46, Weaverville 77/41, Mt. Shasta 68/40, Yreka 73/41, Alturas 69/35

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.

Impressive thunderstorm last night in west Redding and the Old Shasta area.  This morning the low pressure area is along the Central California coast and is moving slowly eastward.  Scattered showers and thunderstorms are expected over all Northern California today.  

The parade of cutoff or closed lows is going to continue.  The current low pressure area will be over Nevada Thursday.   However, the map below shows another system nearing the coast Sunday and moving across the area Monday and early Tuesday. 

Thursday afternoon and evening thunderstorms are expected over the areas north and east of the valley with partly to mostly sunny skies elsewhere.  Friday and Saturday the thunderstorms will be confined to the areas along and east of the Sierra Cascade Crest with sunny skies and slightly above normal temperatures elsewhere.  Sunday and Monday there will be scattered showers and thunderstorms over the foothills and mountains with isolated activity in the valley.   

Tuesday and Wednesday the low will be moving east and the thunderstorms will over the areas north and east of the valley.

The Old Forecaster

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Monday, May 14, 2018

Weather Discussion for Monday May 14, 2018

Normal high and low temperatures for May 14-May 21  (high/low) Redding 81/53, Chico 82/51, Quincy 73/38, Chester 69/35, Susanville 71/39, Grass Valley 72/46, Weaverville 77/41, Mt. Shasta 68/40, Yreka 73/41, Alturas 69/35

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.

In an earlier blog I explained cutoff or closed low pressure areas.   These are low pressure areas that cutoff or close off from the main flow pattern (jetstream).  They are common in the spring and their movement is slow...erratic...and hard to forecast. 

The last several days there has been a closed low over Nevada.  This system has caused showers and thunderstorms over the areas of Northern California along and east of the Sierra Cascade Crest.  Today that low is actually moving slowly back to the west.  Out in the Pacific you can see another closed low forming (see satellite picture below).  This low will be approaching the coast Tuesday and then over Northern California on Wednesday (see map below). As the low nears the coast the Nevada low will dissipate and its moisture will be pulled westward into the off shore low.  The low will be just east of our area Thursday and Friday.  Longer range models show another closed low off the coast late Saturday through Monday.

Today there will be scattered afternoon and evening showers and thunderstorms over the higher elevations east of the valley with isolated activity north and  west.  Temperatures today will be a little above normal.  Tuesday and Wednesday the shower and thunderstorm activity will become more widespread with a chance of thunderstorms over the valley.  Temperatures will be a little below normal.

Thursday and Friday the higher elevations east of the valley will have isolated afternoon and evening thunderstorms with mostly sunny skies elsewhere.  Temperatures will be above normal.

Saturday through Monday the thunderstorms become more widespread with a chance in the valley Sunday and Monday.

The Old Forecaster

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Saturday, May 12, 2018

Weather Discussion for Saturday May 12, 2018

Normal high and low temperatures for May 7-May 14  (high/low) Redding 81/53, Chico 81/49, Quincy 72/36, Chester 67/33, Susanville 69/39, Grass Valley 70/44, Weaverville 76/38, Mt. Shasta 68/38, Yreka 72/38, Alturas 67/33

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.

Interesting and different weather pattern for the next week.   This morning there is a cutoff or closed low over Nevada.   This low will remain stationary for the next several days.   Late Monday and Tuesday another cutoff or closed low will form off the coast (see map below).   The Nevada low will dissipate as this low forms and the moisture from the Nevada low will be pulled into the off shore low.  The low will slowly move eastward and be east of our area by next weekend.  

Weathewise today there will be clouds and a few showers and thunderstorms east of the Sierra Cascade Crest.  The rest of the state will be mostly sunny with above normal temperatures.  Sunday there will be afternoon and evening thunderstorms over Modoc, eastern Siskiyou, eastern Lassen, eastern Plumas and eastern Nevada counties.  Partly to mostly sunny elsewhere with cooler temperatures. Monday through Thursday the afternoon and evening thunderstorms will spread back to the west.   During this time afternoon and evening thunderstorms are expected over the foothills and mountains.   There will be a chance of isolated thunderstorms in the valley Tuesday through Thursday.

Friday and Saturday the thunderstorm threat moves back up in the higher elevations mainly north and east of the valley.  

Temperatures Monday through Saturday will be near normal. 

The Old Forecaster

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Wednesday, May 9, 2018

Weather Discussion for Wednesday May 9, 2018

Normal high and low temperatures for May 7-May 14  (high/low) Redding 81/53, Chico 81/49, Quincy 72/36, Chester 67/33, Susanville 69/39, Grass Valley 70/44, Weaverville 76/38, Mt. Shasta 68/38, Yreka 72/38, Alturas 67/33

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.

High pressure is beginning to build off the west coast.  The high will continue to push northward over the next few days as a low pressure area moves into western Canada and then drops southward into Nevada and Utah.   Friday through the weekend we will be under the weather pattern shown on the map below.  

Today and Thursday we will see mostly clear skies with temperatures above normal.  Winds will be light today but increase from the northwest Thursday afternoon.  Friday through  the weekend the areas east of the Sierra Cascade Crest will see have partly cloudy skies with isolated light showers.  The rest of Northern California will be sunny with temperatures near normal.   However, the combination of the high just off the coast and low pressure just to our east will cause strong gusty north to northeast winds Friday through early Sunday.  

The low will move slowly eastward next week and Monday through Wednesday we will return to sunny skies, temperatures slightly above normal and light winds. 

The Old Forecaster

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Monday, May 7, 2018

Weather Discussion for Monday May 7, 2018

Normal high and low temperatures for May 7-May 14  (high/low) Redding 81/53, Chico 81/49, Quincy 72/36, Chester 67/33, Susanville 69/39, Grass Valley 70/44, Weaverville 76/38, Mt. Shasta 68/38, Yreka 72/38, Alturas 67/33

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.

High pressure still holding over our area and temperatures today will be warmer with some areas in the north valley in the upper 80s to near 90.   The low pressure area shown on this morning's satellite picture (below) out to our west, is moving northeastward.   The southern end of this system will bring some clouds to the north state Tuesday with a few showers and thunderstorms over the foothills and mountains with a slight chance of a thunderstorm in the north end of the valley. 

Wednesday high pressure will rebuild along and over the west coast (see map below).   Wednesday through the weekend looks mostly sunny with temperatures warming to 8 to 12 degrees above normal by the weekend.  Gusty north winds will occur Friday through midday Sunday.

The Old Forecaster

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