A push of cooler and less humid air is settling over Harrisburg, southern Pennsylvania and northern Maryland for the balance of this week.
Several days of bright sunshine are in store.
The push of Canadian air will end the daily risk of showers and thunderstorms experienced during the holiday weekend.
Many people will be able to turn off the fans and air conditioners with temperatures in urban areas dropping well down into the 50s at night.
Many rural will have night time temperatures dipping into the 40s.
Each day Wednesday through Friday will bring bright sunshine and a cool breeze with highs generally in the upper 70s to near 80 degrees.
Beginning Wednesday, the only potential, weather-related travel problem would be patchy early-morning fog for long-distance commuters over the river valleys. Some major highways that could be impacted by isolated fog patches include the Turnpike, I-78, I-81, I-83, and Route 322.
For those hitting beaches this week, the afternoons will still be warm enough to swim, but bring a sweatshirt or jacket for the evenings and mornings.
Following a dip in temperature during the middle of the week, summerlike warmth will rebound across much of the Northeast by this weekend.
An outbreak of severe weather is targeting Kansas and Oklahoma Wednesday evening.
Daily episodes of severe thunderstorms and flooding downpours will impact the Plains this week, possibly lingering into the weekend.
While a few showers will pass east of the Bay Area, seasonable weather and sunshine will hold in place through the weekend.
The central and southern Plains will continue to be pummeled by strong storms for the next several days, but the most potent severe weather threat is likely to be during the Mother's Day weekend.
Wind, seas and surf will build in advance of what is likely to become the first tropical system of 2015 along the southeastern Atlantic coast of the United States late this week.
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.