A series of rainstorms rolling up the Atlantic Seaboard for the balance of the week could contribute to delays for very busy airports in the South and Northeast.
Rain, but not snow will be a frequent visitor in Atlanta, Boston, Baltimore, Charlotte, New York, Philadelphia and Washington, D.C.
The high humidity that accompanies general rainfall often produces areas of fog and low cloud ceilings.
A front approaching from the west is loaded with moisture and will deliver drenching showers and thunderstorms to much of the Atlantic Seaboard today.
A second rain event will affect many of the same areas Thursday into Friday as a storm forms along the front and rolls northeastward toward the mid-Atlantic.
A third rain event is possible in the South later Saturday, depending on the track and speed of yet another storm along the front. It is this storm that may or may not bring a white Christmas to part of the Northeast.
While generally not as disruptive as severe thunderstorms and heavy snowfall, rain and fog can lead to a slowdown in arriving and departing flights. In short, under adverse weather conditions, more separation is needed between individual aircraft that are landing and taking off.
Flights that have a destination to an airport experiencing adverse weather may be held for a time at their point of departure. Such a schedule is called a Ground Delay Program or a Ground Stop and can have ripple effects over a large part of the nation.
In severe cases, aircraft and crews may not get to their destination before they are scheduled to leave on a new flight. This is one reason how flight cancellations can occur until a new schedule can be created with alternative aircraft and crews.
Storms that brought gusty winds and heavy rainfall to the Upper Midwest on Tuesday will shift eastward to the Ohio Valley into Wednesday evening.
The risk of drenching and locally gusty thunderstorms will expand northwestward over the balance of the week, reaching parts of Southern California, Arizona and Nevada.
While the heat wave and high humidity will recede in the Northeast to finish out the week, 90-degree F air may linger in many areas into August.
The Stockholm Arlanda Airport in Sweden is giving travlers a chance to sample weather at various destinations around the world through the use of the Climate Portal.
Over 900 songwriters or singers have written or sung about weather, the most common being Bob Dylan, followed by John Lennon and Paul McCartney, according to British researchers, writing in the journal Weather.
Yuma farmers are starting to take measures to protect their livestock and crops amid one of the longest droughts on record in areas of the Southwest, particularly in the Colorado River Basin.
Burlington, NJ (1925)
Large amount of hail fell and remained on the ground for 3 days.
Colorado Springs, Colorado (1978)
A freak thunderstorm dropped damaging hail to a depth of 2 feet. Much of it had to be plowed from the freeway.
July 29th is historically a rainy day in Waynesburg, PA. It all began in 1878 when a farmer casually told drug store clerk William Allison that it always seemed to rain on July 29th in this southwestern PA town. The clerk made a note of it and started keeping a yearly tabulation. July 29th, 2001 was the 104th rainfall in the past 124 years on this date.