EUGENE, Ore. -- Get ready for some of the hottest temperatures since at least June, and definitely the hottest temperatures of the summer thus far.
The hottest temperature in Eugene this summer was 95 degrees back on July 26, while the hottest temperature of the summer in Roseburg was 95 back on Aug. 4. The last time Roseburg hit 100 degrees was during our heatwave on June 11 and 12. Eugene has not hit 100 degrees since Aug. 3, 2017.
Tuesday: Sunny. Highs in mid 90s to low 100s
Wednesday: Sunny w/ slight chance. Highs in mid to upper 90s
Thursday: Mostly sunny w/ slight chance. Highs in mid to upper 80s
Friday: Mostly sunny. Highs in mid to upper 80s
Saturday: Sunny. Highs in low to mid 80s
Sunday: Sunny. Highs in low to mid 80s
Labor Day: Mostly sunny. Highs low to mid 80s
With a strong upper-level ridge in place and offshore flow (land to sea winds), temperatures will be at or near record-breaking. This a textbook example of the late-summer heat for the region normally seen in September rather than late-August. As a result, hot temperatures could even reach the coastline by noon but will cool some with an afternoon sea breeze. Either way, highs will likely break 80 degrees in spots at the coast this afternoon.
With the heat in place Tuesday and Wednesday, a heat advisory is in place for the entire Willamette Valley and Umpqua Basin. A heat advisory signals the increased threat for heat-related illness and it is advised to drink plenty of water, take breaks if working outside, wear light and loose-fitting clothes, and check on the elderly, kids and pets.
In addition to the heat, critical fire weather is expected in the Willamette Valley Tuesday. This is due to hot temperatures, breezy conditions and relative humidity. Offshore winds will continue out of the northeast, 10 to 15 mph with gusts up to 30 mph. Relative humidity will likely be as low as 15% this afternoon. Those conditions combined with the heat and overall dry fuels in the area has led to a Red Flag Warning until 8 p.m. Tuesday night.
Records will be harder to break on Wednesday as a more southerly wind will move in as a thermal low-pressure system strengthens to the north in the Columbia Basin. This will keep temperatures cooler at the coast and bring back marine morning fog. Additionally, mid-level clouds will move in during the afternoon, with a disturbance coming out of California. Those clouds will likely cap temperatures in the low to mid 90s inland.
The other concern on Wednesday is the chance for Cascade thunderstorms. There is still some uncertainty on the amount and strengthen of said storms, but if they do form, expect prolific lightning. That lightning would likely cause new fires, especially after the heat and dry conditions on the ground.
Thursday through the Labor Day holiday weekend, we'll see more seasonable temperatures and likely dry conditions at this time.
For more weather information, go to the KEZI 9 News StormTracker 9 weather page.