Saturday, March 24, 2018

Weather Discussion for Saturday March 24, 2018

Normal high and low temperatures for March 18-March 25  (high/low) Redding 66/43, Chico 66/41, Quincy 58/30, Chester 53/27, Susanville 55/30, Grass Valley 59/37, Weaverville 61/32, Mt. Shasta 56/ 32, Yreka 58/31 Alturas 55/26

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 area is just off the coast and is moving eastward.  This system will move across Northern California today with showers and possible thunderstorms.  Snow levels will be 2000 feet north and 2500 to 3000 feet south.  Sunday there will be some lingering showers over the mountains which will end by late afternoon.

Monday high pressure begins to build along and over the west coast and will hold there for the next 5 to 7 days (see map below).  Skies will be mostly sunny with a few high clouds.  Temperatures will be warming and by mid week will be 12 to 18 degrees above normal which means some north valley locations will break the 80 degree mark.  Gusty north winds will occur in some areas Monday through Thursday. 

The Old Forecaster

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  1. Thank you Old Forecaster!

    I have been wondering how to interpret the different available satellite images. There is visible, Short wavelength, water vapor, and long wavelength? How should I use those different images together to increase my insight into the weather?


  2. visible, only available during daylight, shows all clouds. The Infra Red scans, use the long wavelength, shows clouds by temperature with the colder or higher clouds being brighter or whiter. Waver Vapor shows the moisture or water vapor in the atmosphere the brighter the more moisture or higher the clouds. Dark airs show dry air. Water Vapor is good to show jetstream or movement and locations of pressure centers.

  3. Thanks. What is the Shortwave IR good for? I have only started to notice how you can see the high clouds versus the low clouds, which seems easiest using the Visible. High clouds don't lead to precipitation, it seems.

    Thanks again for your wonderful website and forecasts!

  4. The pictures I link to shortwave and longwave don't look much different. The longwave shows a few more clouds. In an operational weather office you have access to many different satellite scans and enhancements. For what I link to and what is available on the internet. Visible just like taking a picture with your cellphone from 23000 feet. IR shows colder clouds as white and is available at night. Water vapor shows moisture and movement.

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