Pittsburgh will be faced with a couple of rounds of severe weather into Tuesday evening.
A surge of warm and humid air following the holiday weekend will set the stage for severe thunderstorms.
The afternoon and evening hours are when the strongest thunderstorms will rumble and threaten to cause some damage and hazards to residents.
Powerful wind gusts are the main hazard with the strongest storms through Tuesday. A small number of the storms can also bring hail and flash flooding.
Any thunderstorm each day can also produce frequent lightning. Remember, you are close enough to get struck by lightning if you hear thunder.
After a lingering shower or thunderstorm Wednesday morning, humidity will lower in the afternoon as drier air works into western Pennsylvania.
A comfortable stretch of days will follow for Thursday and Friday, with skies no worse than partly sunny and temperatures rising to around the 80-degree mark.
Bone-chilling air, rain and even some snow will impact the Great Lakes and Northeast this Halloween, while warmth prevails in the Southwest.
A rain-free weekend is in store for the New York City area, ahead of a surge of warmth for the middle part of next week.
Tropical Cyclone Nilofar could threaten areas from the southern Arabian Peninsula to northwestern India this week.
Rain will continue to fall and heighten concerns for flooding across southeastern Europe into Sunday.
Heat building across central South America this weekend will set the stage for adverse weather next week.
After many locations over the Plains feel like late summer this weekend, the record-challenging warmth will expand to the Northeast this week.
Charlotte, NC (1886)
End of 40 day dry spell - longest on record.
Bismarck, ND (1919)
Earliest recorded below-zero reading: minus 10 degrees.
Air pollution alert in Northeastern cities.