Temperatures and humidity will rise this week in the Great Lakes and Northeast while excessive heat builds in parts of the West, serving as a reminder that summer is just around the corner.
The jet stream will shift in the days ahead, with a northward bulge developing over both the East and the West. In addition, an upper-level low will be cut off from the jet stream and linger over the Southern Plains, bringing days of rain and keeping temperatures relatively cool there.
Two upper-level areas of high pressure will be in place over portions of the East and West for the last week of May. This setup often correlates with warmer temperatures, which will be the case in the week ahead.
(MORE: Why Weather Moves Slower In The Late Spring, Summer)
Below, we take a closer look at what to expect, first in the Great Lakes and Northeast, followed by the West.
Warm and Humid in the Great Lakes, Northeast
Warmer temperatures have already returned to parts of the South and Midwest as a southerly flow develops. Dew points will rise into the 60s for most areas, making it feel humid.
Temperatures will be 10 to 25 degrees above average on Monday in much of the Midwest and interior Northeast, and the anomalous warmth will spread throughout the Northeast midweek.
Highs well above average will persist into late week, with most areas climbing well into the 80s, even in northern New England. A few spots may record their first 90-degree temperature of the year, including Pittsburgh and Albany and Syracuse, New York.
Forecast Highs Compared to AverageLow temperatures will also be 10 to 20 degrees warmer than average in the week ahead.
Temperatures will only dip into the 60s as far north as the Upper Peninsula of Michigan, and morning temperatures might be near 70 degrees in parts of the southern and eastern Great Lakes.
Numerous daily warm low-temperature records will likely be broken from the Great Lakes to the Northeast this week.
(MAPS: 10-Day Forecast)
Forecast Morning LowsTemperatures will return closer to average late week in the Great Lakes region and by next weekend in the Northeast.
Heat Builds in the West
Above-average temperatures will begin to develop in California and southern Oregon on Monday and will spread across much of the West by midweek.
Temperatures will be 10 to 25 degrees above average in the West into late week.
Highs will soar into the triple digits from the Desert Southwest into Central California, including Sacramento.
Forecast HighsDaily record highs are likely, especially in California beginning Tuesday.
Sacramento, Fresno, California, and Reno, Nevada, could all set new daily records midweek.
Potential Record Highs TuesdayThe heat will be widespread and may reach dangerous levels.
The National Weather Service in Sacramento noted that the first significant heat wave of the season is expected, and highs over 100 degrees are possible in the area beginning Monday and continuing into late week.
Very hot temperatures, even by local standards, are expected for a prolonged period with limited relief overnight. This can lead to heat-related illnesses.
Excessive heat warnings and watches and heat advisories have been posted by the NWS for parts of the Southwest and California, including Phoenix, Las Vegas and San Francisco.
Avoid exercise outdoors, seek air-conditioned buildings, drink extra water and wear lightweight and light-colored clothing when excessive heat is anticipated. Never leave kids or pets unattended in cars.
Heat AlertsThe Weather Company’s primary journalistic mission is to report on breaking weather news, the environment and the importance of science to our lives. This story does not necessarily represent the position of our parent company, IBM.
The Weather Company’s primary journalistic mission is to report on breaking weather news, the environment and the importance of science to our lives. This story does not necessarily represent the position of our parent company, IBM.
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