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Washington DC weather for April 29: showers and thundershowers

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Brian's exclusive forecast for Washington DC:

*A Flash Flood Watch is in effect from Tuesday night through late Wednesday night*
*A Coastal Flood Watch is in effect from Tuesday night through Wednesday morning*

Today: Periods of rain with isolated thunderstorms. Rain could be heavy at times. The high will be in the upper 40s to lower 50s.

Tonight: Rain with isolated thundershowers. Windy at times. The low will be in the upper 40s to around 50. East winds gusting over 25 m.p.h. at times.

Wednesday: Showers and thunderstorms. Some storms may be severe with heavy rain and strong winds. Milder with a high in the mid 60s. Southeast winds 10 to 20 with gusts over 30.

Wednesday Night: Showers and thunderstorms. Some storms may be severe with heavy rain and strong winds. The low will be in the lower 60s. Southeast winds 10 to 20 with gusts over 30.

Thursday: A chance of showers and thunderstorms in the morning, then clouds and sun. Warmer with a high from 70 to 75. Southwest winds 10 to 20 at times.

The extended forecast calls for a mostly sunny sky on Friday with a low in the lower 50s and a high in the upper 60s. Mostly sunny on Saturday with a low in the upper 40s and a high in the upper 60s. Mostly sunny on Sunday with a low in the upper 40s and a high in the upper 60s. Mostly sunny on Monday with a low in the upper 40s and a high in the upper 60s.

Weather Summary

A rainy and unseasonably cool Tuesday is expected with periods of rain. Rainfall could be heavy at times this afternoon as showers and thundershowers move through the region. Temperatures this afternoon will be nearly 20 degrees below seasonal averages with highs only in the upper 40s to lower 50s. Showers and storms will continue overnight. On Wednesday an area of low pressure will move into the Great Lakes region and its associated warm front will move northward across the Middle Atlantic states. The result will be widespread steady rainfall and occasional thundershowers on Tuesday afternoon through Wednesday as the warm air overrides cooler air the surface. Some of the rain showers may produce heavy rain, hence the need to post flood watches in some areas. Most thundershowers and thunderstorms will be garden variety, but a few may become severe with strong winds and possible tornadic activity. A cold front will push from west to east toward Chesapeake Bay by Wednesday night. This will produce additional showers and thundershowers. Rainfall amounts from Monday night through Wednesday night may exceed 1 to 2 inches with locally higher amounts. The warmest day of the week will be on Thursday as warm air surges north in advance of the cold front. Once the front clears the area, a sunny Friday and Saturday can be expected with lows in the upper 40s to lower 50s and highs in the mid to upper 60s.

Regional Weather Information

Baltimore average lows and highs

Washington average lows and highs

National Weather Service daily weather discussion

Baltimore/Washington National Weather Service

Chesapeake Bay marine forecast

Mid-Atlantic radar loop

For more weather updates, please visit my web site www.chesapeakebayweather.com, my Chesapeake Bay Weather page on Facebook, and if you're heading to Ocean City feel free to check out my Ocean City MD Weather page on Facebook. You can also follow me on Twitter @chesbayweather.

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