A dose of heavy rain has delivered flash and urban flooding problems at the end of the week in the mid-Atlantic and around Harrisburg, Pennsylvania.
A front responsible for torrential rainfall in Texas will joined with tropical moisture from the Atlantic late in the week.
As corridor of moisture pivots through the area into Friday midday, the rainfall produced could be heavy enough to cause additional incidents of flash and urban flooding, along with significant travel delays and disruptions to outdoor activities.
During Friday afternoon and Saturday, the bulk of the showers and thunderstorms will have shifted to the north and east. Travel conditions will improve locally.
A storm in the upper levels of the atmosphere will bring slightly cooler-than-average temperatures over the weekend. Temperatures typically range from a low in the lower 50s to a high in the middle 70s.
Much of Saturday will be free of rain for the Preakness Stakes at Pimlico.
For folks heading to the track, or attending ball games, graduations and weddings, chilly air aloft associated with the storm could bring brief very spotty showers, during the afternoon and evening hours Saturday and Sunday.
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 areas from Texas to Nebraska 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.
Lingle, WI (2000)
4.5" diameter hail - there was also a tornado in the area.
Chicago, IL (1876)
Severe local windstorm resulted in $250,000 damage.
Lakehurst, NJ (1937)
Hindenburg disaster after 4-hour delay of landing due to a thunderstorm.