4 Things To Know About This Week's Weather

Linda Lam
Published: June 18, 2017

Heading toward the summer solstice this week, there certainly will be a summery feel in much of the U.S.

Extreme heat will dominate the Southwest this week, while the East will experience multiple chances for thunderstorms. In addition, there are two areas being monitored in the tropics for possible development.

Below we take a closer look at what to expect this week.

1) Watching the Tropics for Development

An area of shower and thunderstorm activity in the western Caribbean will become more organized into this week. The National Hurricane Center (NHC) has given this area, dubbed 93L, a high chance of development within the next 5 days near Mexico's Yucatan Peninsula.

This system could become a tropical or subtropical depression or storm this week. 

Gulf of Mexico and Caribbean Infrared Satellite

This disturbance will likely increase tropical moisture in the Gulf of Mexico and will enhance rainfall in Florida and along portions of the Gulf coast. High surf and rip currents will also be concerns. Exactly where the heaviest rain will fall along the Gulf Coast is uncertain.

(MORE: Hurricane Central)

There is also another tropical wave in the far eastern Atlantic Ocean that has been given a medium chance of development by the NHC. This system is far from land, but we will continue to monitor this system, named Invest 92L. The Windward Islands could see gusty winds and heavy rain from this system by Tuesday.

Be sure to check back to weather.com for updates.

2) Severe Thunderstorms May Start the Week in the East

A cold front will sweep through the eastern states to start this week. Scattered strong to severe thunderstorms are possible with this system.

(MORE: Severe Thunderstorm Outlook)

Ahead of this cold front, warm and humid conditions are expected to be in place, which will help in the development of strong to severe storms.

Monday's Forecast

The risk for severe thunderstorms will be found from the interior Northeast into the Ohio Valley and lower Mississippi Valley on Sunday. This threat will then slide east on Monday, with the highest chance for severe storms stretching from the mid-Atlantic into New England.

Damaging wind gusts and large hail will be the primary concerns with any severe thunderstorms that develop Sunday into Monday, although an isolated tornado cannot be ruled out.

Heavy rainfall is also possible, which could lead to localized flash flooding.

3) Southwest Will Continue to Sizzle

Extremely hot and dangerous temperatures will take hold of the Southwest this week. This dangerous heat is due to an upper-level ridge of high pressure that will build over the region.

(MORE: Extreme Heat Forecast)

High temperatures will climb higher than 110 degrees in the Desert Southwest, with highs above 100 degrees in the Central Valley of California. High temperatures will remain 10 to 20 degrees above average in the Southwest and Great Basin for much of this week.

Next Week's Forecast

Numerous record high temperatures are also expected and Phoenix may even threaten its all-time record high of 122 degrees, which was set in June 1990.

Low temperatures will also be warmer than average and will not provide much relief from the heat.

(FORECAST: Phoenix | Las Vegas | Sacramento)

Consequently, excessive heat warnings and heat advisories have been issued for much of the region, due to these dangerous conditions and many of these alerts last well into this week.

Slightly cooler temperatures may develop by next weekend from California into the Southwest and Great Basin. Areas from the Pacific Northwest into the northern Rockies will also experience warmer-than-average conditions early in the week, but a cold front will bring cooler temperatures midweek.

This heat will also spread farther east into the central and southern Plains by midweek, with temperatures approaching 100 degrees as far east as Dallas and Oklahoma City.

4) Multiple Systems May Bring More Storms

Midweek, another low-pressure system will move through the Midwest into the Northeast, bringing another round of showers and thunderstorms. A few strong to severe storms are possible, as well.

Then, more energy aloft will ripple through the Midwest and into the East late week and next weekend, resulting in multiple rounds of shower and thunderstorms.

Late Week Forecast

(MORE: Weekly Planner)

At least a few strong to severe thunderstorms are possible, but it is too early for details.

MORE: Florida Storms and Flooding, Early June 2017 (PHOTOS)

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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