The NOAA just released their outlook for the end of May. After the warmer temperatures the last few weeks, much of the west can look forward to cooler conditions, whereas towards the east expect it to be much warmer than normal. The majority of western USA can expect precipitation to be at, or slightly below, average and the east is looking like being drier than usual.
Full forecast discussion below:
8-14 DAY OUTLOOK FOR MAY 20 - 26 2020 During the 8-14 day period, the model ensemble solutions predict a similar but de-amplified 500-hPa circulation pattern relative to the 6-10 day period with a slight eastward progression. Meanwhile, a mean ridge and positive 500-hPa height anomalies are favored over the eastern half of the CONUS. Troughing and below normal 500-hPa geopotential heights are favored over parts of western Mainland Alaska and the Aleutians. Ridging and above normal 500-hPa heights are forecast over the North Pacific and Alaska Panhandle, and parts of the Pacific Northwest. A mean trough is forecast over most of the remainder of the western CONUS. Above normal temperatures are favored for most of Alaska and parts of the Pacific Northwest, consistent with the consolidation forecast tool. Below normal temperatures are likely over much of the western CONUS, due to forecast troughing over the region. Subtropical ridging and above normal 500-hPa heights favor above normal temperatures for much of the eastern and central CONUS. Above normal precipitation is favored for much of Alaska, in association with troughing over the Aleutians. Below normal precipitation is favored for parts of the Pacific northwest and northern California, underneath forecast near to above normal 500-hPa heights. Above normal precipitation is favored for parts of the interior western CONUS eastward across the Northern Plains into the Great Lakes region, in association with predicted mean troughing over the western CONUS. Increased probabilities for above normal precipitation over most of the Great Plains are consistent with the consolidation forecast tool. Below normal precipitation is likely for most of the eastern CONUS, underneath forecast above normal 500-hPa heights. The official 8-14 day 500-hPa height blend consists of: 15% of Today's 6z GFS Ensemble Mean centered on Day 11, 15% of Today's GFS Superensemble Mean centered on Day 11, 10% of Today's operational 6z GFS centered on Day 11, 40% of Today's 0z European Ensemble Mean centered on Day 11, and 20% of Today's 0z Canadian Ensemble Mean centered on Day 11 FORECAST CONFIDENCE FOR THE 8-14 DAY PERIOD: Average, 3 out of 5, due to some disagreement among models in the predicted 500-hPa circulation pattern over North America, leading to uncertainty in the precipitation and temperature fields.