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.
Following a dip in temperature during the middle of the week, summerlike warmth will rebound across much of the Northeast by this weekend.
Daily episodes of severe thunderstorms and flooding downpours will impact the Plains this week, possibly lingering into the weekend.
Wind, seas and surf will build in advance of what could eventually become the first tropical system of 2015 along the southeastern Atlantic coast of the United States late this week.
Summer will lack any long-lasting heat waves across northwestern Europe, while parts of southern and eastern Europe will feel the heat.
Residents of the Philippines are being put on alert for potential impacts from Typhoon Noul, which will be a powerful typhoon when it approaches the Philippines this weekend.
The map will depict the threat levels for the four main storm hazards: wind, storm surge, flooding rain and tornadoes.
Omaha, NE (1975)
Massive tornado killed 3 people and injured 133 while causing 150 million dollars worth of damage. Tornado cut a swath 10 miles long and one-quarter of a mile wide through the industrial and residential areas of west-central Omaha before lifting over the northern section of the city. Most costly U.S. tornado to date.
Thunderstorms rake over Nebraska and Kansas with golf ball-sized hail, wind gusts close to 90 mph at Superior, NE, and 3-1/2 inches of rain at Kensaw, NE.
Sheridan Lake, ND (1984)
Lightning struck a boat out on the water, killing two occupants. A life vest was torn to bits by the powerful bolt.