EUGENE, Ore. -- The persistent weather pattern that we have seen over the last several days is showing some signs of change over the next two days. This is due to a weak Rex block shifting westward. This will bring more northwesterly winds and “cooler” temperatures.
The National Weather Service describes a Rex block as being characterized by a high-pressure system located pole-ward of a low-pressure system. The Rex block will remain nearly stationary until one of the height centers (high or low-pressure centers) changes intensity, unbalancing the high-over-low pattern. Unsettled, stormy weather is usually found near the low pressure while dry conditions are typical with the high-pressure. Strong, particularly persistent Rex blocks can cause flooding near the low-pressure part of the block and short-term drought under the high-pressure part. Here is a textbook example of a Rex Block.
Thursday: Sunny. Highs in mid to upper 80s
Friday: Sunny. Highs in low to mid 80s
Saturday: Mostly sunny. Highs in low to mid 80s
Sunday: Mostly sunny. Highs in low to mid 80s
Monday: Sunny. Highs in mid 80s
Tuesday: Sunny. Highs in upper 80s and low 90s
Wednesday: Sunny. Highs in upper 80s and low 90s
Northwest flow will increase the marine layer as well bring some drizzle along the coast in the morning hours of the coming days. That drizzle will not amount to much in terms of precipitation. In addition to marine layer at the coast, it will bring several degrees of cooling on Friday and Saturday with highs in the lower 80s.
On Sunday winds will shift to a more southeasterly direction ahead of an upper-level trough digging over the Eastern Pacific. This will bring back warmer temperatures and drier weather through Wednesday. Highs inland Tuesday and Wednesday will likely be in the upper 80s and low 90s.
Models point to that upper level trough moving overhead later next week bringing back cooler temperatures, increased clouds, and possible slight chance of precipitation.
For more weather information, go to the KEZI 9 News StormTracker 9 weather page.