Saturday, April 19, 2014
Inquirer Daily News

Bolaris: Jekyll and Hyde weather, and weekend flooding

The wild temperature fluctuations we have experienced in 2014 will continue as a huge swing is about to move in for the weekend.

Temperatures have been swinging from the coldest overall in some 20 years, and then rapidly rebounding to some 50-60 degrees in 48 hours, which was the case after the biggest snow storm of the season so far.

Big storms are usually the case with such extreme temperature swings as the atmosphere becomes a volatile mix.

This latest record cold air mass will modify some today as we move from a high yesterday of 13 degrees (the coldest daytime high for Jan. 7 since 1878) to a high closer to 25 degrees today.

Temperatures will continue to rise into the 30s on Thursday, and then a warmer air begins to move this way early Friday. We could see some snow, mainly in the morning and not looking at anything big, although a light accumulation can't be ruled out as the surface is frozen solid.

Now get ready for Mr. Hyde. A big boost in temperatures will arrive on Saturday as temperatures approach 60 in spots, however, a big storm moving up through the Ohio Valley will swing a ton of moisture this way, straight out of the Gulf of Mexico and flooding rains are possible come Saturday night and into early Sunday morning.

The timing of liquid storm

Saturday afternoon: Steady rain moving in.

Saturday night: Heaviest windswept rains.

Sunday: Early morning rain, then drying by afternoon.

Flash flooding possible for Saturday night and Sunday morning.

Plenty of localized street flooding.

Above normal temperatures will greet us into early next week.

John Bolaris

John Bolaris For Philly.com
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