Northerly winds will drive cold air southward from Canada, then turn it eastward across the Midwest and into the Appalachians in stages through this week, including the Pittsburgh area.
After a brief rebound of warmth on Monday, additional waves of colder air will arrive on the scene over the balance of next week and will eventually push nighttime temperatures to near freezing with daytime highs in the 40s.
Each successive push of colder air will likely bring more wind as well, adding to the chill.
Along with the colder air for the region will come the first opportunities for snow of the season, or at least snowflakes.
There is a high chance of some of the white stuff accumulating over the Laurel Highlands during the second half of this week into the following weekend.
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A tropical disturbance will sweep across Florida and the Bahamas with enhanced downpours and rough surf into the middle of the week.
On Monday, Aug. 21, the event that millions have anticipated will unfold when the moon passes directly in front of the sun.
Tropical Rainstorm Harvey will continue to track toward Central America with heavy rainfall, gusty thunderstorms and dangerous seas early this week. Harvey could regenerate over the next several days.
Heat and humidity surging from the Great Lakes and Ohio Valley into the Northeast will be the key ingredients for severe weather to develop Tuesday and Tuesday night.
A bout of locally heavy rain will impact northern and western areas of the United Kingdom Sunday night into Tuesday as moisture from Gert crosses the British Isles.
The government of Portugal has issued a state of public calamity as wildfires continue to burn across the country ahead of a weekend heat wave.
In addition to Harvey, two additional tropical features are being monitored in the Atlantic basin but rapid development is unlikely at this time.
A renewed threat for severe weather and flooding will emerge over the midwestern United States into Monday night.